function prototypes - Page 985

Physical Directories vs. MVC View Paths

- by Rick Strahl

This post falls into the bucket of operator error on my part, but I want to share this anyway because it describes an issue that has bitten me a few times now and writing it down might keep it a little stronger in my mind. I've been working on an MVC project the last few days, and at the end of a long day I accidentally moved one of my View folders from the MVC Root Folder to the project root. It must have been at the very end of the day before shutting down because tests and manual site navigation worked fine just before I quit for the night. I checked in changes and called it a night. Next day I came back, started running the app and had a lot of breaks with certain views. Oddly custom routes to these controllers/views worked, but stock /{controller}/{action} routes would not. After a bit of spelunking I realized that "Hey one of my View Folders is missing", which made some sense given the error messages I got. I looked in the recycle bin - nothing there, so rather than try to figure out what the hell happened, just restored from my last SVN checkin. At this point the folders are back… but… view access still ends up breaking for this set of views. Specifically I'm getting the Yellow Screen of Death with: CS0103: The name 'model' does not exist in the current context Here's the full error: Server Error in '/ClassifiedsWeb' Application. Compilation ErrorDescription: An error occurred during the compilation of a resource required to service this request. Please review the following specific error details and modify your source code appropriately.Compiler Error Message: CS0103: The name 'model' does not exist in the current contextSource Error: Line 1: @model ClassifiedsWeb.EntryViewModel Line 2: @{ Line 3: ViewBag.Title = Model.Entry.Title + " - " + ClassifiedsBusiness.App.Configuration.ApplicationName; Source File: c:\Projects2010\Clients\GorgeNet\Classifieds\ClassifiedsWeb\Classifieds\Show.cshtml Line: 1 Compiler Warning Messages: Show Detailed Compiler Output: Show Complete Compilation Source: Version Information: Microsoft .NET Framework Version:4.0.30319; ASP.NET Version:4.0.30319.272 Here's what's really odd about this error: The views now do exist in the /Views/Classifieds folder of the project, but it appears like MVC is trying to execute the views directly. This is getting pretty weird, man! So I hook up some break points in my controllers to see if my controller actions are getting fired - and sure enough it turns out they are not - but only for those views that were previously 'lost' and then restored from SVN. WTF? At this point I'm thinking that I must have messed up one of the config files, but after some more spelunking and realizing that all the other Controller views work, I give up that idea. Config's gotta be OK if other controllers and views are working. Root Folders and MVC Views don't mix As I mentioned the problem was the fact that I inadvertantly managed to drag my View folder to the root folder of the project. Here's what this looks like in my FUBAR'd project structure after I copied back /Views/Classifieds folder from SVN: There's the actual root folder in the /Views folder and the accidental copy that sits of the root. I of course did not notice the /Classifieds folder at the root because it was excluded and didn't show up in the project. Now, before you call me a complete idiot remember that this happened by accident - an accidental drag probably just before shutting down for the night. :-) So why does this break? MVC should be happy with views in the /Views/Classifieds folder right? While MVC might be happy, IIS is not. The fact that there is a physical folder on disk takes precedence over MVC's routing. In other words if a URL exists that matches a route the pysical path is accessed first. What happens here is that essentially IIS is trying to execute the .cshtml pages directly without ever routing to the Controller methods. In the error page I showed above my clue should have been that the view was served as: c:\Projects2010\Clients\GorgeNet\Classifieds\ClassifiedsWeb\Classifieds\Show.cshtml rather than c:\Projects2010\Clients\GorgeNet\Classifieds\ClassifiedsWeb\Views\Classifieds\Show.cshtml But of course I didn't notice that right away, just skimming to the end and looking at the file name. The reason that /classifieds/list actually fires that file is that the ASP.NET Web Pages engine looks for physical files on disk that match a path. IOW, when calling Web Pages you drop the .cshtml off the Razor page and IIS will serve that just fine. So: /classifieds/list looks and tries to find /classifieds/list.cshtml and executes that script. And that is exactly what's happening. Web Pages is trying to execute the .cshtml file and it fails because Web Pages knows nothing about the @model tag which is an MVC specific template extension. This is why my breakpoints in the controller methods didn't fire and it also explains why the error mentions that the @model key word is invalid (@model is an MVC provided template enhancement to the Razor Engine). The solution of course is super simple: Delete the accidentally created root folder and the problem is solved. Routing and Physical Paths I've run into problems with this before actually. In the past I've had a number of applications that had a physical /Admin folder which also would conflict with an MVC Admin controller. More than once I ended up wondering why the index route (/Admin/) was not working properly. If a physical /Admin folder exists /Admin will not route to the Index action (or whatever default action you have set up, but instead try to list the directory or show the default document in the folder. The only way to force the index page through MVC is to explicitly use /Admin/Index. Makes perfect sense once you realize the physical folder is there, but that's easy to forget in an MVC application. As you might imagine after a few times of running into this I gave up on the Admin folder and moved everything into MVC views to handle those operations. Still it's one of those things that can easily bite you, because the behavior and error messages seem to point at completely different problems. Moral of the story is: If you see routing problems where routes are not reaching obvious controller methods, always check to make sure there's isn't a physical path being mapped by IIS instead. That way you won't feel stupid like I did after trying a million things for about an hour before discovering my sloppy mousing behavior :-)© Rick Strahl, West Wind Technologies, 2005-2012Posted in MVC IIS7 Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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SQL SERVER – Weekly Series – Memory Lane – #048

- by Pinal Dave

Here is the list of selected articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2007 Order of Result Set of SELECT Statement on Clustered Indexed Table When ORDER BY is Not Used Above theory is true in most of the cases. However SQL Server does not use that logic when returning the resultset. SQL Server always returns the resultset which it can return fastest.In most of the cases the resultset which can be returned fastest is the resultset which is returned using clustered index. Effect of TRANSACTION on Local Variable – After ROLLBACK and After COMMIT One of the Jr. Developer asked me this question (What will be the Effect of TRANSACTION on Local Variable – After ROLLBACK and After COMMIT?) while I was rushing to an important meeting. I was getting late so I asked him to talk with his Application Tech Lead. When I came back from meeting both of them were looking for me. They said they are confused. I quickly wrote down following example for them. 2008 SQL SERVER – Guidelines and Coding Standards Complete List Download Coding standards and guidelines are very important for any developer on the path of a successful career. A coding standard is a set of guidelines, rules and regulations on how to write code. Coding standards should be flexible enough or should take care of the situation where they should not prevent best practices for coding. They are basically the guidelines that one should follow for better understanding. Download Guidelines and Coding Standards complete List Download Get Answer in Float When Dividing of Two Integer Many times we have requirements of some calculations amongst different fields in Tables. One of the software developers here was trying to calculate some fields having integer values and divide it which gave incorrect results in integer where accurate results including decimals was expected. Puzzle – Computed Columns Datatype Explanation SQL Server automatically does a cast to the data type having the highest precedence. So the result of INT and INT will be INT, but INT and FLOAT will be FLOAT because FLOAT has a higher precedence. If you want a different data type, you need to do an EXPLICIT cast. Renaming SP is Not Good Idea – Renaming Stored Procedure Does Not Update sys.procedures I have written many articles about renaming a tables, columns and procedures SQL SERVER – How to Rename a Column Name or Table Name, here I found something interesting about renaming the stored procedures and felt like sharing it with you all. The interesting fact is that when we rename a stored procedure using SP_Rename command, the Stored Procedure is successfully renamed. But when we try to test the procedure using sp_helptext, the procedure will be having the old name instead of new names. 2009 Insert Values of Stored Procedure in Table – Use Table Valued Function It is clear from the result set that , where I have converted stored procedure logic into the table valued function, is much better in terms of logic as it saves a large number of operations. However, this option should be used carefully. The performance of the stored procedure is “usually” better than that of functions. Interesting Observation – Index on Index View Used in Similar Query Recently, I was working on an optimization project for one of the largest organizations. While working on one of the queries, we came across a very interesting observation. We found that there was a query on the base table and when the query was run, it used the index, which did not exist in the base table. On careful examination, we found that the query was using the index that was on another view. This was very interesting as I have personally never experienced a scenario like this. In simple words, “Query on the base table can use the index created on the indexed view of the same base table.” Interesting Observation – Execution Plan and Results of Aggregate Concatenation Queries Working with SQL Server has never seemed to be monotonous – no matter how long one has worked with it. Quite often, I come across some excellent comments that I feel like acknowledging them as blog posts. Recently, I wrote an article on SQL SERVER – Execution Plan and Results of Aggregate Concatenation Queries Depend Upon Expression Location, which is well received in the community. 2010 I encourage all of you to go through complete series and write your own on the subject. If you write an article and send it to me, I will publish it on this blog with due credit to you. If you write on your own blog, I will update this blog post pointing to your blog post. SQL SERVER – ORDER BY Does Not Work – Limitation of the View 1 SQL SERVER – Adding Column is Expensive by Joining Table Outside View – Limitation of the View 2 SQL SERVER – Index Created on View not Used Often – Limitation of the View 3 SQL SERVER – SELECT * and Adding Column Issue in View – Limitation of the View 4 SQL SERVER – COUNT(*) Not Allowed but COUNT_BIG(*) Allowed – Limitation of the View 5 SQL SERVER – UNION Not Allowed but OR Allowed in Index View – Limitation of the View 6 SQL SERVER – Cross Database Queries Not Allowed in Indexed View – Limitation of the View 7 SQL SERVER – Outer Join Not Allowed in Indexed Views – Limitation of the View 8 SQL SERVER – SELF JOIN Not Allowed in Indexed View – Limitation of the View 9 SQL SERVER – Keywords View Definition Must Not Contain for Indexed View – Limitation of the View 10 SQL SERVER – View Over the View Not Possible with Index View – Limitations of the View 11 2011 Startup Parameters Easy to Configure If you are a regular reader of this blog, you must be aware that I have written about SQL Server Denali recently. Here is the quickest way to reach into the screen where we can change the startup parameters. Go to SQL Server Configuration Manager >> SQL Server Services >> Right Click on the Server >> Properties >> Startup Parameters 2012 Validating Unique Columnname Across Whole Database I sometimes come across very strange requirements and often I do not receive a proper explanation of the same. Here is the one of those examples. For example “Our business requirement is when we add new column we want it unique across current database.” Read the solution to this strange request in this blog post. Excel Losing Decimal Values When Value Pasted from SSMS ResultSet It is very common when users are coping the resultset to Excel, the floating point or decimals are missed. The solution is very much simple and it requires a small adjustment in the Excel. By default Excel is very smart and when it detects the value which is getting pasted is numeric it changes the column format to accommodate that. Basic Calculation and PEMDAS Order of Operation Read this interesting blog post for fantastic conversation about the subject. Copy Column Headers from Resultset – SQL in Sixty Seconds #027 – Video http://www.youtube.com/watch?v=x_-3tLqTRv0 Delete From Multiple Table – Update Multiple Table in Single Statement There are two questions which I get every single day multiple times. In my gmail, I have created standard canned reply for them. Let us see the questions here. I want to delete from multiple table in a single statement how will I do it? I want to update multiple table in a single statement how will I do it? Read the answer in the blog post. Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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Changing an HTML Form's Target with jQuery

- by Rick Strahl

This is a question that comes up quite frequently: I have a form with several submit or link buttons and one or more of the buttons needs to open a new Window. How do I get several buttons to all post to the right window? If you're building ASP.NET forms you probably know that by default the Web Forms engine sends button clicks back to the server as a POST operation. A server form has a <form> tag which expands to this: <form method="post" action="default.aspx" id="form1"> Now you CAN change the target of the form and point it to a different window or frame, but the problem with that is that it still affects ALL submissions of the current form. If you multiple buttons/links and they need to go to different target windows/frames you can't do it easily through the <form runat="server"> tag. Although this discussion uses ASP.NET WebForms as an example, realistically this is a general HTML problem although likely more common in WebForms due to the single form metaphor it uses. In ASP.NET MVC for example you'd have more options by breaking out each button into separate forms with its own distinct target tag. However, even with that option it's not always possible to break up forms - for example if multiple targets are required but all targets require the same form data to the be posted. A common scenario here is that you might have a button (or link) that you click where you still want some server code to fire but at the end of the request you actually want to display the content in a new window. A common operation where this happens is report generation: You click a button and the server generates a report say in PDF format and you then want to display the PDF result in a new window without killing the content in the current window. Assuming you have other buttons on the same Page that need to post to base window how do you get the button click to go to a new window? Can't you just use a LinkButton or other Link Control? At first glance you might think an easy way to do this is to use an ASP.NET LinkButton to do this - after all a LinkButton creates a hyper link that CAN accept a target and it also posts back to the server, right? However, there's no Target property, although you can set the target HTML attribute easily enough. Code like this looks reasonable: <asp:LinkButton runat="server" ID="btnNewTarget" Text="New Target" target="_blank" OnClick="bnNewTarget_Click" /> But if you try this you'll find that it doesn't work. Why? Because ASP.NET creates postbacks with JavaScript code that operates on the current window/frame: <a id="btnNewTarget" target="_blank" href="javascript:__doPostBack('btnNewTarget','')">New Target</a> What happens with a target tag is that before the JavaScript actually executes a new window is opened and the focus shifts to the new window. The new window of course is empty and has no __doPostBack() function nor access to the old document. So when you click the link a new window opens but the window remains blank without content - no server postback actually occurs. Natch that idea. Setting the Form Target for a Button Control or LinkButton So, in order to send Postback link controls and buttons to another window/frame, both require that the target of the form gets changed dynamically when the button or link is clicked. Luckily this is rather easy to do however using a little bit of script code and jQuery. Imagine you have two buttons like this that should go to another window: <asp:LinkButton runat="server" ID="btnNewTarget" Text="New Target" OnClick="ClickHandler" /> <asp:Button runat="server" ID="btnButtonNewTarget" Text="New Target Button" OnClick="ClickHandler" /> ClickHandler in this case is any routine that generates the output you want to display in the new window. Generally this output will not come from the current page markup but is generated externally - like a PDF report or some report generated by another application component or tool. The output generally will be either generated by hand or something that was generated to disk to be displayed with Response.Redirect() or Response.TransmitFile() etc. Here's the dummy handler that just generates some HTML by hand and displays it: protected void ClickHandler(object sender, EventArgs e) { // Perform some operation that generates HTML or Redirects somewhere else Response.Write("Some custom output would be generated here (PDF, non-Page HTML etc.)"); // Make sure this response doesn't display the page content // Call Response.End() or Response.Redirect() Response.End(); } To route this oh so sophisticated output to an alternate window for both the LinkButton and Button Controls, you can use the following simple script code: <script type="text/javascript"> $("#btnButtonNewTarget,#btnNewTarget").click(function () { $("form").attr("target", "_blank"); }); </script> So why does this work where the target attribute did not? The difference here is that the script fires BEFORE the target is changed to the new window. When you put a target attribute on a link or form the target is changed as the very first thing before the link actually executes. IOW, the link literally executes in the new window when it's done this way. By attaching a click handler, though we're not navigating yet so all the operations the script code performs (ie. __doPostBack()) and the collection of Form variables to post to the server all occurs in the current page. By changing the target from within script code the target change fires as part of the form submission process which means it runs in the correct context of the current page. IOW - the input for the POST is from the current page, but the output is routed to a new window/frame. Just what we want in this scenario. Voila you can dynamically route output to the appropriate window.© Rick Strahl, West Wind Technologies, 2005-2011Posted in ASP.NET HTML jQuery

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T-SQL Tuesday #31 - Logging Tricks with CONTEXT_INFO

- by Most Valuable Yak (Rob Volk)

This month's T-SQL Tuesday is being hosted by Aaron Nelson [b | t], fellow Atlantan (the city in Georgia, not the famous sunken city, or the resort in the Bahamas) and covers the topic of logging (the recording of information, not the harvesting of trees) and maintains the fine T-SQL Tuesday tradition begun by Adam Machanic [b | t] (the SQL Server guru, not the guy who fixes cars, check the spelling again, there will be a quiz later). This is a trick I learned from Fernando Guerrero [b | t] waaaaaay back during the PASS Summit 2004 in sunny, hurricane-infested Orlando, during his session on Secret SQL Server (not sure if that's the correct title, and I haven't used parentheses in this paragraph yet). CONTEXT_INFO is a neat little feature that's existed since SQL Server 2000 and perhaps even earlier. It lets you assign data to the current session/connection, and maintains that data until you disconnect or change it. In addition to the CONTEXT_INFO() function, you can also query the context_info column in sys.dm_exec_sessions, or even sysprocesses if you're still running SQL Server 2000, if you need to see it for another session. While you're limited to 128 bytes, one big advantage that CONTEXT_INFO has is that it's independent of any transactions. If you've ever logged to a table in a transaction and then lost messages when it rolled back, you can understand how aggravating it can be. CONTEXT_INFO also survives across multiple SQL batches (GO separators) in the same connection, so for those of you who were going to suggest "just log to a table variable, they don't get rolled back": HA-HA, I GOT YOU! Since GO starts a new batch all variable declarations are lost. Here's a simple example I recently used at work. I had to test database mirroring configurations for disaster recovery scenarios and measure the network throughput. I also needed to log how long it took for the script to run and include the mirror settings for the database in question. I decided to use AdventureWorks as my database model, and Adam Machanic's Big Adventure script to provide a fairly large workload that's repeatable and easily scalable. My test would consist of several copies of AdventureWorks running the Big Adventure script while I mirrored the databases (or not). Since Adam's script contains several batches, I decided CONTEXT_INFO would have to be used. As it turns out, I only needed to grab the start time at the beginning, I could get the rest of the data at the end of the process. The code is pretty small: declare @time binary(128)=cast(getdate() as binary(8)) set context_info @time ... rest of Big Adventure code ... go use master; insert mirror_test(server,role,partner,db,state,safety,start,duration) select @@servername, mirroring_role_desc, mirroring_partner_instance, db_name(database_id), mirroring_state_desc, mirroring_safety_level_desc, cast(cast(context_info() as binary(8)) as datetime), datediff(s,cast(cast(context_info() as binary(8)) as datetime),getdate()) from sys.database_mirroring where db_name(database_id) like 'Adv%'; I declared @time as a binary(128) since CONTEXT_INFO is defined that way. I couldn't convert GETDATE() to binary(128) as it would pad the first 120 bytes as 0x00. To keep the CAST functions simple and avoid using SUBSTRING, I decided to CAST GETDATE() as binary(8) and let SQL Server do the implicit conversion. It's not the safest way perhaps, but it works on my machine. :) As I mentioned earlier, you can query system views for sessions and get their CONTEXT_INFO. With a little boilerplate code this can be used to monitor long-running procedures, in case you need to kill a process, or are just curious how long certain parts take. In this example, I added code to Adam's Big Adventure script to set CONTEXT_INFO messages at strategic places I want to monitor. (His code is in UPPERCASE as it was in the original, mine is all lowercase): declare @msg binary(128) set @msg=cast('Altering bigProduct.ProductID' as binary(128)) set context_info @msg go ALTER TABLE bigProduct ALTER COLUMN ProductID INT NOT NULL GO set context_info 0x0 go declare @msg1 binary(128) set @msg1=cast('Adding pk_bigProduct Constraint' as binary(128)) set context_info @msg1 go ALTER TABLE bigProduct ADD CONSTRAINT pk_bigProduct PRIMARY KEY (ProductID) GO set context_info 0x0 go declare @msg2 binary(128) set @msg2=cast('Altering bigTransactionHistory.TransactionID' as binary(128)) set context_info @msg2 go ALTER TABLE bigTransactionHistory ALTER COLUMN TransactionID INT NOT NULL GO set context_info 0x0 go declare @msg3 binary(128) set @msg3=cast('Adding pk_bigTransactionHistory Constraint' as binary(128)) set context_info @msg3 go ALTER TABLE bigTransactionHistory ADD CONSTRAINT pk_bigTransactionHistory PRIMARY KEY NONCLUSTERED(TransactionID) GO set context_info 0x0 go declare @msg4 binary(128) set @msg4=cast('Creating IX_ProductId_TransactionDate Index' as binary(128)) set context_info @msg4 go CREATE NONCLUSTERED INDEX IX_ProductId_TransactionDate ON bigTransactionHistory(ProductId,TransactionDate) INCLUDE(Quantity,ActualCost) GO set context_info 0x0 This doesn't include the entire script, only those portions that altered a table or created an index. One annoyance is that SET CONTEXT_INFO requires a literal or variable, you can't use an expression. And since GO starts a new batch I need to declare a variable in each one. And of course I have to use CAST because it won't implicitly convert varchar to binary. And even though context_info is a nullable column, you can't SET CONTEXT_INFO NULL, so I have to use SET CONTEXT_INFO 0x0 to clear the message after the statement completes. And if you're thinking of turning this into a UDF, you can't, although a stored procedure would work. So what does all this aggravation get you? As the code runs, if I want to see which stage the session is at, I can run the following (assuming SPID 51 is the one I want): select CAST(context_info as varchar(128)) from sys.dm_exec_sessions where session_id=51 Since SQL Server 2005 introduced the new system and dynamic management views (DMVs) there's not as much need for tagging a session with these kinds of messages. You can get the session start time and currently executing statement from them, and neatly presented if you use Adam's sp_whoisactive utility (and you absolutely should be using it). Of course you can always use xp_cmdshell, a CLR function, or some other tricks to log information outside of a SQL transaction. All the same, I've used this trick to monitor long-running reports at a previous job, and I still think CONTEXT_INFO is a great feature, especially if you're still using SQL Server 2000 or want to supplement your instrumentation. If you'd like an exercise, consider adding the system time to the messages in the last example, and an automated job to query and parse it from the system tables. That would let you track how long each statement ran without having to run Profiler. #TSQL2sDay

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More Fun With Math

- by PointsToShare

More Fun with Math The runaway student – three different ways of solving one problem Here is a problem I read in a Russian site: A student is running away. He is moving at 1 mph. Pursuing him are a lion, a tiger and his math teacher. The lion is 40 miles behind and moving at 6 mph. The tiger is 28 miles behind and moving at 4 mph. His math teacher is 30 miles behind and moving at 5 mph. Who will catch him first? Analysis Obviously we have a set of three problems. They are all basically the same, but the details are different. The problems are of the same class. Here is a little excursion into computer science. One of the things we strive to do is to create solutions for classes of problems rather than individual problems. In your daily routine, you call it re-usability. Not all classes of problems have such solutions. If a class has a general (re-usable) solution, it is called computable. Otherwise it is unsolvable. Within unsolvable classes, we may still solve individual (some but not all) problems, albeit with different approaches to each. Luckily the vast majority of our daily problems are computable, and the 3 problems of our runaway student belong to a computable class. So, let’s solve for the catch-up time by the math teacher, after all she is the most frightening. She might even make the poor runaway solve this very problem – perish the thought! Method 1 – numerical analysis. At 30 miles and 5 mph, it’ll take her 6 hours to come to where the student was to begin with. But by then the student has advanced by 6 miles. 6 miles require 6/5 hours, but by then the student advanced by another 6/5 of a mile as well. And so on and so forth. So what are we to do? One way is to write code and iterate it until we have solved it. But this is an infinite process so we’ll end up with an infinite loop. So what to do? We’ll use the principles of numerical analysis. Any calculator – your computer included – has a limited number of digits. A double floating point number is good for about 14 digits. Nothing can be computed at a greater accuracy than that. This means that we will not iterate ad infinidum, but rather to the point where 2 consecutive iterations yield the same result. When we do financial computations, we don’t even have to go that far. We stop at the 10th of a penny. It behooves us here to stop at a 10th of a second (100 milliseconds) and this will how we will avoid an infinite loop. Interestingly this alludes to the Zeno paradoxes of motion – in particular “Achilles and the Tortoise”. Zeno says exactly the same. To catch the tortoise, Achilles must always first come to where the tortoise was, but the tortoise keeps moving – hence Achilles will never catch the tortoise and our math teacher (or lion, or tiger) will never catch the student, or the policeman the thief. Here is my resolution to the paradox. The distance and time in each step are smaller and smaller, so the student will be caught. The only thing that is infinite is the iterative solution. The race is a convergent geometric process so the steps are diminishing, but each step in the solution takes the same amount of effort and time so with an infinite number of steps, we’ll spend an eternity solving it. This BTW is an original thought that I have never seen before. But I digress. Let’s simply write the code to solve the problem. To make sure that it runs everywhere, I’ll do it in JavaScript. function LongCatchUpTime(D, PV, FV) // D is Distance; PV is Pursuers Velocity; FV is Fugitive’ Velocity { var t = 0; var T = 0; var d = parseFloat(D); var pv = parseFloat (PV); var fv = parseFloat (FV); t = d / pv; while (t > 0.000001) //a 10th of a second is 1/36,000 of an hour, I used 1/100,000 { T = T + t; d = t * fv; t = d / pv; } return T; } By and large, the higher the Pursuer’s velocity relative to the fugitive, the faster the calculation. Solving this with the 10th of a second limit yields: 7.499999232000001 Method 2 – Geometric Series. Each step in the iteration above is smaller than the next. As you saw, we stopped iterating when the last step was small enough, small enough not to really matter. When we have a sequence of numbers in which the ratio of each number to its predecessor is fixed we call the sequence geometric. When we are looking at the sum of sequence, we call the sequence of sums series. Now let’s look at our student and teacher. The teacher runs 5 times faster than the student, so with each iteration the distance between them shrinks to a fifth of what it was before. This is a fixed ratio so we deal with a geometric series. We normally designate this ratio as q and when q is less than 1 (0 < q < 1) the sum of + … + is – 1) / (q – 1). When q is less than 1, it is easier to use ) / (1 - q). Now, the steps are 6 hours then 6/5 hours then 6/5*5 and so on, so q = 1/5. And the whole series is multiplied by 6. Also because q is less than 1 , 1/ diminishes to 0. So the sum is just / (1 - q). or 1/ (1 – 1/5) = 1 / (4/5) = 5/4. This times 6 yields 7.5 hours. We can now continue with some algebra and take it back to a simpler formula. This is arduous and I am not going to do it here. Instead let’s do some simpler algebra. Method 3 – Simple Algebra. If the time to capture the fugitive is T and the fugitive travels at 1 mph, then by the time the pursuer catches him he travelled additional T miles. Time is distance divided by speed, so…. (D + T)/V = T thus D + T = VT and D = VT – T = (V – 1)T and T = D/(V – 1) This “strangely” coincides with the solution we just got from the geometric sequence. This is simpler ad faster. Here is the corresponding code. function ShortCatchUpTime(D, PV, FV) { var d = parseFloat(D); var pv = parseFloat (PV); var fv = parseFloat (FV); return d / (pv - fv); } The code above, for both the iterative solution and the algebraic solution are actually for a larger class of problems. In our original problem the student’s velocity (speed) is 1 mph. In the code it may be anything as long as it is less than the pursuer’s velocity. As long as PV > FV, the pursuer will catch up. Here is the really general formula: T = D / (PV – FV) Finally, let’s run the program for each of the pursuers. It could not be worse. I know he’d rather be eaten alive than suffering through yet another math lesson. See the code run? Select “Catch Up Time” in www.mgsltns.com/games.htm The host is running on Unix, so the link is case sensitive. That’s All Folks

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Using JQuery tabs in an HTML 5 page

- by nikolaosk

In this post I will show you how to create a simple tabbed interface using JQuery,HTML 5 and CSS.Make sure you have downloaded the latest version of JQuery (minified version) from http://jquery.com/download.Please find here all my posts regarding JQuery.Also have a look at my posts regarding HTML 5.In order to be absolutely clear this is not (and could not be) a detailed tutorial on HTML 5. There are other great resources for that.Navigate to the excellent interactive tutorials of W3School.Another excellent resource is HTML 5 Doctor.Two very nice sites that show you what features and specifications are implemented by various browsers and their versions are http://caniuse.com/ and http://html5test.com/. At this times Chrome seems to support most of HTML 5 specifications.Another excellent way to find out if the browser supports HTML 5 and CSS 3 features is to use the Javascript lightweight library Modernizr.In this hands-on example I will be using Expression Web 4.0.This application is not a free application. You can use any HTML editor you like.You can use Visual Studio 2012 Express edition. You can download it here. Let me move on to the actual example.This is the sample HTML 5 page<!DOCTYPE html><html lang="en"> <head> <title>Liverpool Legends</title> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" > <link rel="stylesheet" type="text/css" href="style.css"> <script type="text/javascript" src="jquery-1.8.2.min.js"> </script> <script type="text/javascript" src="tabs.js"></script> </head> <body> <header> <h1>Liverpool Legends</h1> </header> <section id="tabs"> <ul> <li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=9143136#first-tab">Defenders</a></li> <li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=9143136#second-tab">Midfielders</a></li> <li><a href="http://weblogs.asp.net/controlpanel/blogs/posteditor.aspx?SelectedNavItem=Posts§ionid=1153&postid=9143136#third-tab">Strikers</a></li> </ul> <div id="first-tab"> <h3>Liverpool Defenders</h3> <p> The best defenders that played for Liverpool are Jamie Carragher, Sami Hyypia , Ron Yeats and Alan Hansen.</p> </div> <div id="second-tab"> <h3>Liverpool Midfielders</h3> <p> The best midfielders that played for Liverpool are Kenny Dalglish, John Barnes,Ian Callaghan,Steven Gerrard and Jan Molby. </p> </div> <div id="third-tab"> <h3>Liverpool Strikers</h3> <p>The best strikers that played for Liverpool are Ian Rush,Roger Hunt,Robbie Fowler and Fernando Torres.<br/> </p> </div> </div></section> <footer> <p>All Rights Reserved</p> </footer> </body> </html> This is very simple HTML markup. I have styled this markup using CSS.The contents of the style.css file follow* { margin: 0; padding: 0;}header{font-family:Tahoma;font-size:1.3em;color:#505050;text-align:center;}#tabs { font-size: 0.9em; margin: 20px 0;}#tabs ul { float: left; background: #777; width: 260px; padding-top: 24px;}#tabs li { margin-left: 8px; list-style: none;}* html #tabs li { display: inline;}#tabs li, #tabs li a { float: left;}#tabs ul li.active { border-top:2px red solid; background: #15ADFF;}#tabs ul li.active a { color: #333333;}#tabs div { background: #15ADFF; clear: both; padding: 15px; min-height: 200px;}#tabs div h3 { margin-bottom: 12px;}#tabs div p { line-height: 26px;}#tabs ul li a { text-decoration: none; padding: 8px; color:#0b2f20; font-weight: bold;}footer{background-color:#999;width:100%;text-align:center;font-size:1.1em;color:#002233;}There are some CSS rules that style the various elements in the HTML 5 file. These are straight-forward rules. The JQuery code lives inside the tabs.js file $(document).ready(function(){$('#tabs div').hide();$('#tabs div:first').show();$('#tabs ul li:first').addClass('active'); $('#tabs ul li a').click(function(){$('#tabs ul li').removeClass('active');$(this).parent().addClass('active');var currentTab = $(this).attr('href');$('#tabs div').hide();$(currentTab).show();return false;});}); I am using some of the most commonly used JQuery functions like hide , show, addclass , removeClass I hide and show the tabs when the tab becomes the active tab. When I view my page I get the following result Hope it helps!!!!!

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Modern/Metro Internet Explorer: What were they thinking???

- by Rick Strahl

As I installed Windows 8.1 last week I decided that I really should take a closer look at Internet Explorer in the Modern/Metro environment again. Right away I ran into two issues that are real head scratchers to me.Modern Split Windows don't resize Viewport but Zoom OutThis one falls in the "WTF, really?" department: It looks like Modern Internet Explorer's Modern doesn't resize the browser window as every other browser (including IE 11 on the desktop) does, but rather tries to adjust the zoom to the width of the browser. This means that if you use the Modern IE browser and you split the display between IE and another application, IE will be zoomed out, with text becoming much, much smaller, rather than resizing the browser viewport and adjusting the pixel width as you would when a browser window is typically resized.Here's what I'm talking about in a couple of pictures. First here's the full screen Internet Explorer version (this shot is resized down since it's full screen at 1080p, click to see the full image):This brings up the first issue which is: On the desktop who wants to browse a site full screen? Most sites aren't fully optimized for 1080p widescreen experience and frankly most content that wide just looks weird. Even in typical 10" resolutions of 1280 width it's weird to look at things this way. At least this issue can be worked around with @media queries and either constraining the view, or adding additional content to make use of the extra space. Still running a desktop browser full screen is not optimal on a desktop machine - ever.Regardless, this view, while oversized, is what I expect: Everything is rendered in the right ratios, with font-size and the responsive design styling properly respected.But now look what happens when you split the desktop windows and show half desktop and have modern IE (this screen shot is not resized but cropped - this is actual size content as you can see in the cropped Twitter window on the right half of the screen):What's happening here is that IE is zooming out of the content to make it fit into the smaller width, shrinking the content rather than resizing the viewport's pixel width. In effect it looks like the pixel width stays at 1080px and the viewport expands out height-wise in response resulting in some crazy long portrait view.There goes responsive design - out the window literally. If you've built your site using @media queries and fixed viewport sizes, Internet Explorer completely screws you in this split view. On my 1080p monitor, the site shown at a little under half width becomes completely unreadable as the fonts are too small and break up. As you go into split view and you resize the window handle the content of the browser gets smaller and smaller (and effectively longer and longer on the bottom) effectively throwing off any responsive layout to the point of un-readability even on a big display, let alone a small tablet screen.What could POSSIBLY be the benefit of this screwed up behavior? I checked around a bit trying different pages in this shrunk down view. Other than the Microsoft home page, every page I went to was nearly unreadable at a quarter width. The only page I found that worked 'normally' was the Microsoft home page which undoubtedly is optimized just for Internet Explorer specifically.Bottom Address Bar opaquely overlays ContentAnother problematic feature for me is the browser address bar on the bottom. Modern IE shows the status bar opaquely on the bottom, overlaying the content area of the Web Page - until you click on the page. Until you do though, the address bar overlays the bottom content solidly. And not just a little bit but by good sizable chunk.In the application from the screen shot above I have an application toolbar on the bottom and the IE Address bar completely hides that bottom toolbar when the page is first loaded, until the user clicks into the content at which point the address bar shrinks down to a fat border style bar with a … on it. Toolbars on the bottom are pretty common these days, especially for mobile optimized applications, so I'd say this is a common use case. But even if you don't have toolbars on the bottom maybe there's other fixed content on the bottom of the page that is vital to display. While other browsers often also show address bars and then later hide them, these other browsers tend to resize the viewport when the address bar status changes, so the content can respond to the size change. Not so with Modern IE. The address bar overlays content and stays visible until content is clicked. No resize notification or viewport height change is sent to the browser.So basically Internet Explorer is telling me: "Our toolbar is more important than your content!" - AND gives me no chance to re-act to that behavior. The result on this page/application is that the user sees no actionable operations until he or she clicks into the content area, which is terrible from a UI perspective as the user has no idea what options are available on initial load.It's doubly confounding in that IE is running in full screen mode and has an the entire height of the screen at its disposal - there's plenty of real estate available to not require this sort of hiding of content in the first place. Heck, even Windows Phone with its more constrained size doesn't hide content - in fact the address bar on Windows Phone 8 is always visible.What were they thinking?Every time I use anything in the Modern Metro interface in Windows 8/8.1 I get angry. I can pretty much ignore Metro/Modern for my everyday usage, but unfortunately with Internet Explorer in the modern shell I have to live with, because there will be users using it to access my sites. I think it's inexcusable by Microsoft to build such a crappy shell around the browser that impacts the actual usability of Web content. In both of the cases above I can only scratch my head at what could have possibly motivated anybody designing the UI for the browser to make these screwed up choices, that manipulate the content in a totally unmaintainable way.© Rick Strahl, West Wind Technologies, 2005-2013Posted in Windows HTML5 Tweet !function(d,s,id){var js,fjs=d.getElementsByTagName(s)[0];if(!d.getElementById(id)){js=d.createElement(s);js.id=id;js.src="//platform.twitter.com/widgets.js";fjs.parentNode.insertBefore(js,fjs);}}(document,"script","twitter-wjs"); (function() { var po = document.createElement('script'); po.type = 'text/javascript'; po.async = true; po.src = 'https://apis.google.com/js/plusone.js'; var s = document.getElementsByTagName('script')[0]; s.parentNode.insertBefore(po, s); })();

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Premature-Optimization and Performance Anxiety

- by James Michael Hare

While writing my post analyzing the new .NET 4 ConcurrentDictionary class (here), I fell into one of the classic blunders that I myself always love to warn about. After analyzing the differences of time between a Dictionary with locking versus the new ConcurrentDictionary class, I noted that the ConcurrentDictionary was faster with read-heavy multi-threaded operations. Then, I made the classic blunder of thinking that because the original Dictionary with locking was faster for those write-heavy uses, it was the best choice for those types of tasks. In short, I fell into the premature-optimization anti-pattern. Basically, the premature-optimization anti-pattern is when a developer is coding very early for a perceived (whether rightly-or-wrongly) performance gain and sacrificing good design and maintainability in the process. At best, the performance gains are usually negligible and at worst, can either negatively impact performance, or can degrade maintainability so much that time to market suffers or the code becomes very fragile due to the complexity. Keep in mind the distinction above. I'm not talking about valid performance decisions. There are decisions one should make when designing and writing an application that are valid performance decisions. Examples of this are knowing the best data structures for a given situation (Dictionary versus List, for example) and choosing performance algorithms (linear search vs. binary search). But these in my mind are macro optimizations. The error is not in deciding to use a better data structure or algorithm, the anti-pattern as stated above is when you attempt to over-optimize early on in such a way that it sacrifices maintainability. In my case, I was actually considering trading the safety and maintainability gains of the ConcurrentDictionary (no locking required) for a slight performance gain by using the Dictionary with locking. This would have been a mistake as I would be trading maintainability (ConcurrentDictionary requires no locking which helps readability) and safety (ConcurrentDictionary is safe for iteration even while being modified and you don't risk the developer locking incorrectly) -- and I fell for it even when I knew to watch out for it. I think in my case, and it may be true for others as well, a large part of it was due to the time I was trained as a developer. I began college in in the 90s when C and C++ was king and hardware speed and memory were still relatively priceless commodities and not to be squandered. In those days, using a long instead of a short could waste precious resources, and as such, we were taught to try to minimize space and favor performance. This is why in many cases such early code-bases were very hard to maintain. I don't know how many times I heard back then to avoid too many function calls because of the overhead -- and in fact just last year I heard a new hire in the company where I work declare that she didn't want to refactor a long method because of function call overhead. Now back then, that may have been a valid concern, but with today's modern hardware even if you're calling a trivial method in an extremely tight loop (which chances are the JIT compiler would optimize anyway) the results of removing method calls to speed up performance are negligible for the great majority of applications. Now, obviously, there are those coding applications where speed is absolutely king (for example drivers, computer games, operating systems) where such sacrifices may be made. But I would strongly advice against such optimization because of it's cost. Many folks that are performing an optimization think it's always a win-win. That they're simply adding speed to the application, what could possibly be wrong with that? What they don't realize is the cost of their choice. For every piece of straight-forward code that you obfuscate with performance enhancements, you risk the introduction of bugs in the long term technical debt of the application. It will become so fragile over time that maintenance will become a nightmare. I've seen such applications in places I have worked. There are times I've seen applications where the designer was so obsessed with performance that they even designed their own memory management system for their application to try to squeeze out every ounce of performance. Unfortunately, the application stability often suffers as a result and it is very difficult for anyone other than the original designer to maintain. I've even seen this recently where I heard a C++ developer bemoaning that in VS2010 the iterators are about twice as slow as they used to be because Microsoft added range checking (probably as part of the 0x standard implementation). To me this was almost a joke. Twice as slow sounds bad, but it almost never as bad as you think -- especially if you're gaining safety. The only time twice is really that much slower is when once was too slow to begin with. Think about it. 2 minutes is slow as a response time because 1 minute is slow. But if an iterator takes 1 microsecond to move one position and a new, safer iterator takes 2 microseconds, this is trivial! The only way you'd ever really notice this would be in iterating a collection just for the sake of iterating (i.e. no other operations). To my mind, the added safety makes the extra time worth it. Always favor safety and maintainability when you can. I know it can be a hard habit to break, especially if you started out your career early or in a language such as C where they are very performance conscious. But in reality, these type of micro-optimizations only end up hurting you in the long run. Remember the two laws of optimization. I'm not sure where I first heard these, but they are so true: For beginners: Do not optimize. For experts: Do not optimize yet. This is so true. If you're a beginner, resist the urge to optimize at all costs. And if you are an expert, delay that decision. As long as you have chosen the right data structures and algorithms for your task, your performance will probably be more than sufficient. Chances are it will be network, database, or disk hits that will be your slow-down, not your code. As they say, 98% of your code's bottleneck is in 2% of your code so premature-optimization may add maintenance and safety debt that won't have any measurable impact. Instead, code for maintainability and safety, and then, and only then, when you find a true bottleneck, then you should go back and optimize further.

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T-SQL Tuesday #31 - Logging Tricks with CONTEXT_INFO

- by Most Valuable Yak (Rob Volk)

This month's T-SQL Tuesday is being hosted by Aaron Nelson [b | t], fellow Atlantan (the city in Georgia, not the famous sunken city, or the resort in the Bahamas) and covers the topic of logging (the recording of information, not the harvesting of trees) and maintains the fine T-SQL Tuesday tradition begun by Adam Machanic [b | t] (the SQL Server guru, not the guy who fixes cars, check the spelling again, there will be a quiz later). This is a trick I learned from Fernando Guerrero [b | t] waaaaaay back during the PASS Summit 2004 in sunny, hurricane-infested Orlando, during his session on Secret SQL Server (not sure if that's the correct title, and I haven't used parentheses in this paragraph yet). CONTEXT_INFO is a neat little feature that's existed since SQL Server 2000 and perhaps even earlier. It lets you assign data to the current session/connection, and maintains that data until you disconnect or change it. In addition to the CONTEXT_INFO() function, you can also query the context_info column in sys.dm_exec_sessions, or even sysprocesses if you're still running SQL Server 2000, if you need to see it for another session. While you're limited to 128 bytes, one big advantage that CONTEXT_INFO has is that it's independent of any transactions. If you've ever logged to a table in a transaction and then lost messages when it rolled back, you can understand how aggravating it can be. CONTEXT_INFO also survives across multiple SQL batches (GO separators) in the same connection, so for those of you who were going to suggest "just log to a table variable, they don't get rolled back": HA-HA, I GOT YOU! Since GO starts a new batch all variable declarations are lost. Here's a simple example I recently used at work. I had to test database mirroring configurations for disaster recovery scenarios and measure the network throughput. I also needed to log how long it took for the script to run and include the mirror settings for the database in question. I decided to use AdventureWorks as my database model, and Adam Machanic's Big Adventure script to provide a fairly large workload that's repeatable and easily scalable. My test would consist of several copies of AdventureWorks running the Big Adventure script while I mirrored the databases (or not). Since Adam's script contains several batches, I decided CONTEXT_INFO would have to be used. As it turns out, I only needed to grab the start time at the beginning, I could get the rest of the data at the end of the process. The code is pretty small: declare @time binary(128)=cast(getdate() as binary(8)) set context_info @time ... rest of Big Adventure code ... go use master; insert mirror_test(server,role,partner,db,state,safety,start,duration) select @@servername, mirroring_role_desc, mirroring_partner_instance, db_name(database_id), mirroring_state_desc, mirroring_safety_level_desc, cast(cast(context_info() as binary(8)) as datetime), datediff(s,cast(cast(context_info() as binary(8)) as datetime),getdate()) from sys.database_mirroring where db_name(database_id) like 'Adv%'; I declared @time as a binary(128) since CONTEXT_INFO is defined that way. I couldn't convert GETDATE() to binary(128) as it would pad the first 120 bytes as 0x00. To keep the CAST functions simple and avoid using SUBSTRING, I decided to CAST GETDATE() as binary(8) and let SQL Server do the implicit conversion. It's not the safest way perhaps, but it works on my machine. :) As I mentioned earlier, you can query system views for sessions and get their CONTEXT_INFO. With a little boilerplate code this can be used to monitor long-running procedures, in case you need to kill a process, or are just curious how long certain parts take. In this example, I added code to Adam's Big Adventure script to set CONTEXT_INFO messages at strategic places I want to monitor. (His code is in UPPERCASE as it was in the original, mine is all lowercase): declare @msg binary(128) set @msg=cast('Altering bigProduct.ProductID' as binary(128)) set context_info @msg go ALTER TABLE bigProduct ALTER COLUMN ProductID INT NOT NULL GO set context_info 0x0 go declare @msg1 binary(128) set @msg1=cast('Adding pk_bigProduct Constraint' as binary(128)) set context_info @msg1 go ALTER TABLE bigProduct ADD CONSTRAINT pk_bigProduct PRIMARY KEY (ProductID) GO set context_info 0x0 go declare @msg2 binary(128) set @msg2=cast('Altering bigTransactionHistory.TransactionID' as binary(128)) set context_info @msg2 go ALTER TABLE bigTransactionHistory ALTER COLUMN TransactionID INT NOT NULL GO set context_info 0x0 go declare @msg3 binary(128) set @msg3=cast('Adding pk_bigTransactionHistory Constraint' as binary(128)) set context_info @msg3 go ALTER TABLE bigTransactionHistory ADD CONSTRAINT pk_bigTransactionHistory PRIMARY KEY NONCLUSTERED(TransactionID) GO set context_info 0x0 go declare @msg4 binary(128) set @msg4=cast('Creating IX_ProductId_TransactionDate Index' as binary(128)) set context_info @msg4 go CREATE NONCLUSTERED INDEX IX_ProductId_TransactionDate ON bigTransactionHistory(ProductId,TransactionDate) INCLUDE(Quantity,ActualCost) GO set context_info 0x0 This doesn't include the entire script, only those portions that altered a table or created an index. One annoyance is that SET CONTEXT_INFO requires a literal or variable, you can't use an expression. And since GO starts a new batch I need to declare a variable in each one. And of course I have to use CAST because it won't implicitly convert varchar to binary. And even though context_info is a nullable column, you can't SET CONTEXT_INFO NULL, so I have to use SET CONTEXT_INFO 0x0 to clear the message after the statement completes. And if you're thinking of turning this into a UDF, you can't, although a stored procedure would work. So what does all this aggravation get you? As the code runs, if I want to see which stage the session is at, I can run the following (assuming SPID 51 is the one I want): select CAST(context_info as varchar(128)) from sys.dm_exec_sessions where session_id=51 Since SQL Server 2005 introduced the new system and dynamic management views (DMVs) there's not as much need for tagging a session with these kinds of messages. You can get the session start time and currently executing statement from them, and neatly presented if you use Adam's sp_whoisactive utility (and you absolutely should be using it). Of course you can always use xp_cmdshell, a CLR function, or some other tricks to log information outside of a SQL transaction. All the same, I've used this trick to monitor long-running reports at a previous job, and I still think CONTEXT_INFO is a great feature, especially if you're still using SQL Server 2000 or want to supplement your instrumentation. If you'd like an exercise, consider adding the system time to the messages in the last example, and an automated job to query and parse it from the system tables. That would let you track how long each statement ran without having to run Profiler. #TSQL2sDay

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C# Performance Pitfall – Interop Scenarios Change the Rules

- by Reed

C# and .NET, overall, really do have fantastic performance in my opinion. That being said, the performance characteristics dramatically differ from native programming, and take some relearning if you’re used to doing performance optimization in most other languages, especially C, C++, and similar. However, there are times when revisiting tricks learned in native code play a critical role in performance optimization in C#. I recently ran across a nasty scenario that illustrated to me how dangerous following any fixed rules for optimization can be… The rules in C# when optimizing code are very different than C or C++. Often, they’re exactly backwards. For example, in C and C++, lifting a variable out of loops in order to avoid memory allocations often can have huge advantages. If some function within a call graph is allocating memory dynamically, and that gets called in a loop, it can dramatically slow down a routine. This can be a tricky bottleneck to track down, even with a profiler. Looking at the memory allocation graph is usually the key for spotting this routine, as it’s often “hidden” deep in call graph. For example, while optimizing some of my scientific routines, I ran into a situation where I had a loop similar to: for (i=0; i<numberToProcess; ++i) { // Do some work ProcessElement(element[i]); } .csharpcode, .csharpcode pre { font-size: small; color: black; font-family: consolas, "Courier New", courier, monospace; background-color: #ffffff; /*white-space: pre;*/ } .csharpcode pre { margin: 0em; } .csharpcode .rem { color: #008000; } .csharpcode .kwrd { color: #0000ff; } .csharpcode .str { color: #006080; } .csharpcode .op { color: #0000c0; } .csharpcode .preproc { color: #cc6633; } .csharpcode .asp { background-color: #ffff00; } .csharpcode .html { color: #800000; } .csharpcode .attr { color: #ff0000; } .csharpcode .alt { background-color: #f4f4f4; width: 100%; margin: 0em; } .csharpcode .lnum { color: #606060; } This loop was at a fairly high level in the call graph, and often could take many hours to complete, depending on the input data. As such, any performance optimization we could achieve would be greatly appreciated by our users. After a fair bit of profiling, I noticed that a couple of function calls down the call graph (inside of ProcessElement), there was some code that effectively was doing: // Allocate some data required DataStructure* data = new DataStructure(num); // Call into a subroutine that passed around and manipulated this data highly CallSubroutine(data); // Read and use some values from here double values = data->Foo; // Cleanup delete data; // ... return bar; Normally, if “DataStructure” was a simple data type, I could just allocate it on the stack. However, it’s constructor, internally, allocated it’s own memory using new, so this wouldn’t eliminate the problem. In this case, however, I could change the call signatures to allow the pointer to the data structure to be passed into ProcessElement and through the call graph, allowing the inner routine to reuse the same “data” memory instead of allocating. At the highest level, my code effectively changed to something like: DataStructure* data = new DataStructure(numberToProcess); for (i=0; i<numberToProcess; ++i) { // Do some work ProcessElement(element[i], data); } delete data; Granted, this dramatically reduced the maintainability of the code, so it wasn’t something I wanted to do unless there was a significant benefit. In this case, after profiling the new version, I found that it increased the overall performance dramatically – my main test case went from 35 minutes runtime down to 21 minutes. This was such a significant improvement, I felt it was worth the reduction in maintainability. In C and C++, it’s generally a good idea (for performance) to: Reduce the number of memory allocations as much as possible, Use fewer, larger memory allocations instead of many smaller ones, and Allocate as high up the call stack as possible, and reuse memory I’ve seen many people try to make similar optimizations in C# code. For good or bad, this is typically not a good idea. The garbage collector in .NET completely changes the rules here. In C#, reallocating memory in a loop is not always a bad idea. In this scenario, for example, I may have been much better off leaving the original code alone. The reason for this is the garbage collector. The GC in .NET is incredibly effective, and leaving the allocation deep inside the call stack has some huge advantages. First and foremost, it tends to make the code more maintainable – passing around object references tends to couple the methods together more than necessary, and overall increase the complexity of the code. This is something that should be avoided unless there is a significant reason. Second, (unlike C and C++) memory allocation of a single object in C# is normally cheap and fast. Finally, and most critically, there is a large advantage to having short lived objects. If you lift a variable out of the loop and reuse the memory, its much more likely that object will get promoted to Gen1 (or worse, Gen2). This can cause expensive compaction operations to be required, and also lead to (at least temporary) memory fragmentation as well as more costly collections later. As such, I’ve found that it’s often (though not always) faster to leave memory allocations where you’d naturally place them – deep inside of the call graph, inside of the loops. This causes the objects to stay very short lived, which in turn increases the efficiency of the garbage collector, and can dramatically improve the overall performance of the routine as a whole. In C#, I tend to: Keep variable declarations in the tightest scope possible Declare and allocate objects at usage While this tends to cause some of the same goals (reducing unnecessary allocations, etc), the goal here is a bit different – it’s about keeping the objects rooted for as little time as possible in order to (attempt) to keep them completely in Gen0, or worst case, Gen1. It also has the huge advantage of keeping the code very maintainable – objects are used and “released” as soon as possible, which keeps the code very clean. It does, however, often have the side effect of causing more allocations to occur, but keeping the objects rooted for a much shorter time. Now – nowhere here am I suggesting that these rules are hard, fast rules that are always true. That being said, my time spent optimizing over the years encourages me to naturally write code that follows the above guidelines, then profile and adjust as necessary. In my current project, however, I ran across one of those nasty little pitfalls that’s something to keep in mind – interop changes the rules. In this case, I was dealing with an API that, internally, used some COM objects. In this case, these COM objects were leading to native allocations (most likely C++) occurring in a loop deep in my call graph. Even though I was writing nice, clean managed code, the normal managed code rules for performance no longer apply. After profiling to find the bottleneck in my code, I realized that my inner loop, a innocuous looking block of C# code, was effectively causing a set of native memory allocations in every iteration. This required going back to a “native programming” mindset for optimization. Lifting these variables and reusing them took a 1:10 routine down to 0:20 – again, a very worthwhile improvement. Overall, the lessons here are: Always profile if you suspect a performance problem – don’t assume any rule is correct, or any code is efficient just because it looks like it should be Remember to check memory allocations when profiling, not just CPU cycles Interop scenarios often cause managed code to act very differently than “normal” managed code. Native code can be hidden very cleverly inside of managed wrappers

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How to select the first ocurrence in the auto-completion menu by pressing Enter?

- by janoChen

Every time there's is a pop up menu. I select the first occurrence and press enter but nothing happens (the word is not completed with he selected occurrence). The only way is to press Tab until you reach the term for a second time. Is there a way of selecting the first occurrence pressing Enter (or other Vim hotkey)? My .vimrc: " SHORTCUTS nnoremap <F4> :set filetype=html<CR> nnoremap <F5> :set filetype=php<CR> nnoremap <F3> :TlistToggle<CR> " press space to turn off highlighting and clear any message already displayed. nnoremap <silent> <Space> :nohlsearch<Bar>:echo<CR> " set buffers commands nnoremap <silent> <M-F8> :BufExplorer<CR> nnoremap <silent> <F8> :bn<CR> nnoremap <silent> <S-F8> :bp<CR> " open NERDTree with start directory: D:\wamp\www nnoremap <F9> :NERDTree /home/alex/www<CR> " open MRU nnoremap <F10> :MRU<CR> " open current file (silently) nnoremap <silent> <F11> :let old_reg=@"<CR>:let @"=substitute(expand("%:p"), "/", "\\", "g")<CR>:silent!!cmd /cstart <C-R><C-R>"<CR><CR>:let @"=old_reg<CR> " open current file in localhost (default browser) nnoremap <F12> :! start "http://localhost" file:///"%:p""<CR> " open Vim's default Explorer nnoremap <silent> <F2> :Explore<CR> nnoremap <C-F2> :%s/\.html/.php/g<CR> " REMAPPING " map leader to , let mapleader = "," " remap ` to ' nnoremap ' ` nnoremap ` ' " remap increment numbers nnoremap <C-kPlus> <C-A> " COMPRESSION function Js_css_compress () let cwd = expand('<afile>:p:h') let nam = expand('<afile>:t:r') let ext = expand('<afile>:e') if -1 == match(nam, "[\._]src$") let minfname = nam.".min.".ext else let minfname = substitute(nam, "[\._]src$", "", "g").".".ext endif if ext == 'less' if executable('lessc') cal system( 'lessc '.cwd.'/'.nam.'.'.ext.' &') endif else if filewritable(cwd.'/'.minfname) if ext == 'js' && executable('closure-compiler') cal system( 'closure-compiler --js '.cwd.'/'.nam.'.'.ext.' > '.cwd.'/'.minfname.' &') elseif executable('yuicompressor') cal system( 'yuicompressor '.cwd.'/'.nam.'.'.ext.' > '.cwd.'/'.minfname.' &') endif endif endif endfunction autocmd FileWritePost,BufWritePost *.js :call Js_css_compress() autocmd FileWritePost,BufWritePost *.css :call Js_css_compress() autocmd FileWritePost,BufWritePost *.less :call Js_css_compress() " GUI " taglist right side let Tlist_Use_Right_Window = 1 " hide tool bar set guioptions-=T "remove scroll bars set guioptions+=LlRrb set guioptions-=LlRrb " set the initial size of window set lines=46 columns=180 " set default font set guifont=Monospace " set guifont=Monospace\ 10 " show line number set number " set default theme colorscheme molokai-2 " encoding set encoding=utf-8 setglobal fileencoding=utf-8 bomb set fileencodings=ucs-bom,utf-8,latin1 " SCSS syntax highlight au BufRead,BufNewFile *.scss set filetype=scss " LESS syntax highlight syntax on au BufNewFile,BufRead *.less set filetype=less " Haml syntax highlight "au! BufRead,BufNewFile *.haml "setfiletype haml " Sass syntax highlight "au! BufRead,BufNewFile *.sass "setfiletype sass " set filetype indent filetype indent on " for snipMate to work filetype plugin on " show breaks set showbreak=-----> " coding format set tabstop=4 set shiftwidth=4 set linespace=1 " CONFIG " set location of ctags let Tlist_Ctags_Cmd='D:\ctags58\ctags.exe' " keep the buffer around when left set hidden " enable matchit plugin source $VIMRUNTIME/macros/matchit.vim " folding set foldmethod=marker set foldmarker={,} let g:FoldMethod = 0 map <leader>ff :call ToggleFold()<cr> fun! ToggleFold() if g:FoldMethod == 0 exe 'set foldmethod=indent' let g:FoldMethod = 1 else exe 'set foldmethod=marker' let g:FoldMethod = 0 endif endfun " save and restore folds when a file is closed and re-opened "au BufWrite ?* mkview "au BufRead ?* silent loadview " auto-open NERDTree everytime Vim is invoked au VimEnter * NERDTree /home/alex/www " set omnicomplete autocmd FileType python set omnifunc=pythoncomplete#Complete autocmd FileType javascript set omnifunc=javascriptcomplete#CompleteJS autocmd FileType html set omnifunc=htmlcomplete#CompleteTags autocmd FileType css set omnifunc=csscomplete#CompleteCSS autocmd FileType xml set omnifunc=xmlcomplete#CompleteTags autocmd FileType php set omnifunc=phpcomplete#CompletePHP autocmd FileType c set omnifunc=ccomplete#Complete " Remove trailing white-space once the file is saved au BufWritePre * silent g/\s\+$/s/// " Use CTRL-S for saving, also in Insert mode noremap <C-S> :update!<CR> vnoremap <C-S> <C-C>:update!<CR> inoremap <C-S> <C-O>:update!<CR> " DEFAULT set nocompatible source $VIMRUNTIME/vimrc_example.vim "source $VIMRUNTIME/mswin.vim "behave mswin " disable creation of swap files set noswapfile " no back ups wwhile editing set nowritebackup " disable creation of backups set nobackup " no file change pop up warning autocmd FileChangedShell * echohl WarningMsg | echo "File changed shell." | echohl None set diffexpr=MyDiff() function MyDiff() let opt = '-a --binary ' if &diffopt =~ 'icase' | let opt = opt . '-i ' | endif if &diffopt =~ 'iwhite' | let opt = opt . '-b ' | endif let arg1 = v:fname_in if arg1 =~ ' ' | let arg1 = '"' . arg1 . '"' | endif let arg2 = v:fname_new if arg2 =~ ' ' | let arg2 = '"' . arg2 . '"' | endif let arg3 = v:fname_out if arg3 =~ ' ' | let arg3 = '"' . arg3 . '"' | endif let eq = '' if $VIMRUNTIME =~ ' ' if &sh =~ '\<cmd' let cmd = '""' . $VIMRUNTIME . '\diff"' let eq = '"' else let cmd = substitute($VIMRUNTIME, ' ', '" ', '') . '\diff"' endif else let cmd = $VIMRUNTIME . '\diff' endif silent execute '!' . cmd . ' ' . opt . arg1 . ' ' . arg2 . ' > ' . arg3 . eq endfunction

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Need Help in optimizing a loop in C [migrated]

- by WedaPashi

I am trying to draw a Checkerboard pattern on a lcd using a GUI library called emWin. I have actually managed to draw it using the following code. But having these many loops in the program body for a single task, that too in the internal flash of the Microcontroller is not a good idea. Those who have not worked with emWin, I will try and explain a few things before we go for actual logic. GUI_REST is a structure which id define source files of emWin and I am blind to it. Rect, REct2,Rec3.. and so on till Rect10 are objects. Elements of the Rect array are {x0,y0,x1,y1}, where x0,y0 are starting locations of rectangle in X-Y plane and x1, y1 are end locations of Rectangle in x-Y plane. So, Rect={0,0,79,79} is a rectangle starts at top left of the LCD and is upto (79,79), so its a square basically. The function GUI_setBkColor(int color); sets the color of the background. The function GUI_setColor(int color); sets the color of the foreground. GUI_WHITE and DM_CHECKERBOARD_COLOR are two color values, #defineed GUI_FillRectEx(&Rect); will draw the Rectangle. The code below works fine but I want to make it smarter. GUI_RECT Rect = {0, 0, 79, 79}; GUI_RECT Rect2 = {80, 0, 159, 79}; GUI_RECT Rect3 = {160, 0, 239, 79}; GUI_RECT Rect4 = {240, 0, 319, 79}; GUI_RECT Rect5 = {320, 0, 399, 79}; GUI_RECT Rect6 = {400, 0, 479, 79}; GUI_RECT Rect7 = {480, 0, 559, 79}; GUI_RECT Rect8 = {560, 0, 639, 79}; GUI_RECT Rect9 = {640, 0, 719, 79}; GUI_RECT Rect10 = {720, 0, 799, 79}; WM_SelectWindow(Win_DM_Main); GUI_SetBkColor(GUI_BLACK); GUI_Clear(); for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(GUI_WHITE); else GUI_SetColor(DM_CHECKERBOARD_COLOR); GUI_FillRectEx(&Rect); Rect.y0 += 80; Rect.y1 += 80; } /* for(j=0,j<11;j++) { for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(GUI_WHITE); else GUI_SetColor(DM_CHECKERBOARD_COLOR); GUI_FillRectEx(&Rect); Rect.y0 += 80; Rect.y1 += 80; } Rect.x0 += 80; Rect.x1 += 80; } */ for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(DM_CHECKERBOARD_COLOR); else GUI_SetColor(GUI_WHITE); GUI_FillRectEx(&Rect2); Rect2.y0 += 80; Rect2.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(GUI_WHITE); else GUI_SetColor(DM_CHECKERBOARD_COLOR); GUI_FillRectEx(&Rect3); Rect3.y0 += 80; Rect3.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(DM_CHECKERBOARD_COLOR); else GUI_SetColor(GUI_WHITE); GUI_FillRectEx(&Rect4); Rect4.y0 += 80; Rect4.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(GUI_WHITE); else GUI_SetColor(DM_CHECKERBOARD_COLOR); GUI_FillRectEx(&Rect5); Rect5.y0 += 80; Rect5.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(DM_CHECKERBOARD_COLOR); else GUI_SetColor(GUI_WHITE); GUI_FillRectEx(&Rect6); Rect6.y0 += 80; Rect6.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(GUI_WHITE); else GUI_SetColor(DM_CHECKERBOARD_COLOR); GUI_FillRectEx(&Rect7); Rect7.y0 += 80; Rect7.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(DM_CHECKERBOARD_COLOR); else GUI_SetColor(GUI_WHITE); GUI_FillRectEx(&Rect8); Rect8.y0 += 80; Rect8.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(GUI_WHITE); else GUI_SetColor(DM_CHECKERBOARD_COLOR); GUI_FillRectEx(&Rect9); Rect9.y0 += 80; Rect9.y1 += 80; } for(i = 0; i < 6; i++) { if(i%2 == 0) GUI_SetColor(DM_CHECKERBOARD_COLOR); else GUI_SetColor(GUI_WHITE); GUI_FillRectEx(&Rect10); Rect10.y0 += 80; Rect10.y1 += 80; }

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Looking into the JQuery Carousel Lite Plugin

- by nikolaosk

I have been using JQuery for a couple of years now and it has helped me to solve many problems on the client side of web development. You can find all my posts about JQuery in this link. In this post I will be providing you with a hands-on example on the JQuery Carousel Lite Plugin.If you want you can have a look at this post, where I describe the JQuery Cycle Plugin. I will be writing more posts regarding the most commonly used JQuery Plugins. I have been using extensively this plugin in my websites.You can show a portion of a set of images with previous and next navigation.In this hands-on example I will be using Expression Web 4.0.This application is not a free application. You can use any HTML editor you like.You can use Visual Studio 2012 Express edition. You can download it here. You can download this plugin from this linkI launch Expression Web 4.0 and then I type the following HTML markup (I am using HTML 5)<html lang="en"> <head> <title>Liverpool Legends</title> <meta http-equiv="Content-Type" content="text/html;charset=utf-8" > <link rel="stylesheet" type="text/css" href="style.css"> <script type="text/javascript" src="jquery-1.8.3.min.js"> </script> <script type="text/javascript" src="jcarousellite_1.0.1.min.js"></script> <script type="text/javascript"> $(function () { $(".theImages").jCarouselLite({ btnNext: "#Nextbtn", btnPrev: "#Previousbtn" }); }); </script> </head> <body> <header> <h1>Liverpool Legends</h1> </header> <div id="main"> <img id="Previousbtn" src="previous.png" /> <div class="theImages"> <ul> <li><img src="championsofeurope.jpg"></li> <li><img src="steven_gerrard.jpg"></li> <li><img src="ynwa.jpg"></li> <li><img src="dalglish.jpg"></li> <li><img src="Souness.jpg"></li> </ul> </div> <img id="Nextbtn" src="next.png" /> </div> <footer> <p>All Rights Reserved</p> </footer> </body> </html> This is a very simple markup. I have added my photos (make sure you use your own when trying this example)I have added references to the JQuery library (current version is 1.8.3) and the JQuery Carousel Lite Plugin. Then I add 5 images in the theImages div element.The Javascript code that makes it all happen follows. <script type="text/javascript"> $(function () { $(".theImages").jCarouselLite({ btnNext: "#Nextbtn", btnPrev: "#Previousbtn" }); }); </script>I also have added some basic CSS style rules in the style.css file. body{background-color:#efefef;color:#791d22;} #Previousbtn{position:absolute; left:5px; top:100px;}#Nextbtn {position:absolute; left:812px; top:100px;}.theImages {margin-left:145px;margin-top:10px;} It couldn't be any simpler than that. I view my simple in Internet Explorer 10 and it works as expected.I have tested this simple solution in all major browsers and it works fine.Hope it helps!!!

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SQL SERVER – Weekly Series – Memory Lane – #031

- by Pinal Dave

Here is the list of selected articles of SQLAuthority.com across all these years. Instead of just listing all the articles I have selected a few of my most favorite articles and have listed them here with additional notes below it. Let me know which one of the following is your favorite article from memory lane. 2007 Find Table without Clustered Index – Find Table with no Primary Key Clustered index is very important concept for any table. They impact the performance very heavily. Here is a quick script to find tables without a clustered index. Replace TEXT with VARCHAR(MAX) – Stop using TEXT, NTEXT, IMAGE Data Types Question: “Is VARCHAR (MAX) big enough to store the TEXT field?” Answer: “Yes, VARCHAR(MAX) is big enough to accommodate TEXT field. TEXT, NTEXT and IMAGE data types of SQL Server 2000 will be deprecated in a future version of SQL Server, SQL Server 2005 provides backward compatibility to data types but it is recommended to use new data types which are VARHCAR (MAX), NVARCHAR (MAX) and VARBINARY (MAX).” Limiting Result Sets by Using TABLESAMPLE – Examples Introduced in SQL Server 2005, TABLESAMPLE allows you to extract a sampling of rows from a table in the FROM clause. The rows retrieved are random and they are are not in any order. This sampling can be based on a percentage of number of rows. You can use TABLESAMPLE when only a sampling of rows is necessary for the application instead of a full result set. User Defined Functions (UDF) Limitations UDF have its own advantage and usage but in this article we will see the limitation of UDF. Things UDF can not do and why Stored Procedure are considered as more flexible then UDFs. Stored Procedure are more flexibility then User Defined Functions(UDF). However, this blog post is a good read to know what are the limitations of UDF. Change Database Compatible Level – Backward Compatibility For a long time SQL Server stayed on the compatibility level of 80 which is of SQL Server 2000. However, as soon as SQL Server 2005 introduced the issue of compatibility was quite a major issue. Since that time MS has been releasing the versions at every 2-3 years, changing compatibility is a ever popular topic. In this blog post, we learn how we can do the same using T-SQL. We can also do the same using SSMS and here is the blog post for the same: Change Database Compatible Level – Backward Compatibility – Part 2 – Management Studio. Constraint on VARCHAR(MAX) Field To Limit It Certain Length How can I limit the VARCHAR(MAX) field with maximum length of 12500 characters only. His Question was valid as our application was allowed 12500 characters. First of all – this requirement is bit strange but if someone wants to do the same, they can do it as described in this blog post. 2008 UNPIVOT Table Example Understanding UNPIVOT can be very complicated at times. In this blog post, I have attempted to explain the same concept in very simple words. Create Default Constraint Over Table Column A simple straight to script blog post – I still use this blog quite many times for my own reference. UDF – Get the Day of the Week Function It took me 4 iteration to find this very simple function which can immediately get the day of the week in a single line. 2009 Find Hostname and Current Logged In User Name There are two tricks listed in this blog post where users can find out the hostname and current logged user name immediately and very easily. Interesting Observation of Logon Trigger On All Servers When I was doing a project, I made an interesting observation of executing a logon trigger multiple times. It was absolutely unexpected for me! As I was logging only once, naturally, I was expecting the entry only once. However, it did it multiple times on different threads – indeed an eccentric phenomenon at first sight! Difference Between Candidate Keys and Primary Key One needs to be very careful in selecting the Primary Key as an incorrect selection can adversely impact the database architect and future normalization. For a Candidate Key to qualify as a Primary Key, it should be Non-NULL and unique in any domain. I have observed quite often that Primary Keys are seldom changed. I would like to have your feedback on not changing a Primary Key. Create Multiple Filegroup For Single Database Why should one create multiple file group for any database and what are the advantages of the same. In this blog post, I explain the same in detail. List All Objects Created on All Filegroups in Database In this blog post we discuss the essential question – “How can I find which object belongs to which filegroup. Is there any way to know this?” 2010 DATE and TIME in SQL Server 2008 When DATE is converted to DATETIME it adds the of midnight. When TIME is converted to DATETIME it adds the date of 1900 and it is something one wants to consider if you are going to run scripts from SQL Server 2008 to earlier version with CONVERT. Disabled Index and Update Statistics If you do not need a nonclustered index, I suggest you to drop it as keeping them disabled is an overhead on your system. This is because every time the statistics are updated for system all the statistics for disabled indexes are also updated. Precision of SMALLDATETIME – A 1 Minute Precision The precision of the datatype SMALLDATETIME is 1 minute. It discards the seconds by rounding up or rounding down any seconds greater than zero. 2011 Getting Columns Headers without Result Data – SET FMTONLY ON SET FMTONLY ON returns only metadata to the client. It can be used to test the format of the response without actually running the query. When this setting is ON the resultset only have headers of the results but no data. Copy Database from Instance to Another Instance – Copy Paste in SQL Server SQL Server has a feature which copy database from one database to another database and it can be automated as well using SSIS. Make sure you have SQL Server Agent Turned on as this feature will create a job. Puzzle – SELECT * vs SELECT COUNT(*) If you have ever wondered SELECT * gives error when executed alone but SELECT COUNT(*) does not. Why? in that case, you should read this blog post. Creating All New Database with Full Recovery Model This blog post is very based on very interesting story where the user wants to do something by default for every single new database created. Model database is a secret weapon which should be used very carefully and with proper evalution. If used carefully this can be a very much beneficiary when we need a newly created database behave in certain fashion. 2012 In year 2012 I had two interesting series ran on the blog. If there is no fun in learning, the learning becomes a burden. For the same reason, I had decided to build a three part quiz around SEQUENCE. The quiz was to identify the next value of the sequence. I encourage all of you to take part in this fun quiz. Guess the Next Value – Puzzle 1 Guess the Next Value – Puzzle 2 Guess the Next Value – Puzzle 3 Can anyone remember their final day of schooling? This is probably a silly question because – of course you can! Many people mark this as the most exciting, happiest day of their life. It marks the end of testing, the end of following rules set by teachers, and the beginning of finally being able to earn money and work in your chosen field. Read five part series on developer training subject Developer Training - Importance and Significance - Part 1 Developer Training – Employee Morals and Ethics – Part 2 Developer Training – Difficult Questions and Alternative Perspective - Part 3 Developer Training – Various Options for Developer Training – Part 4 Developer Training – A Conclusive Summary- Part 5 Reference: Pinal Dave (http://blog.sqlauthority.com) Filed under: Memory Lane, PostADay, SQL, SQL Authority, SQL Query, SQL Server, SQL Tips and Tricks, T SQL, Technology

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Who could ask for more with LESS CSS? (Part 3 of 3–Clrizr)

- by ToString(theory);

Welcome back! In the first two posts in this series, I covered some of the awesome features in CSS precompilers such as SASS and LESS, as well as how to get an initial project setup up and running in ASP.Net MVC 4. In this post, I will cover an actual advanced example of using LESS in a project, and show some of the great productivity features we gain from its usage. Introduction In the first post, I mentioned two subjects that I will be using in this example – constants, and color functions. I’ve always enjoyed using online color scheme utilities such as Adobe Kuler or Color Scheme Designer to come up with a scheme based off of one primary color. Using these tools, and requesting a complementary scheme you can get a couple of shades of your primary color, and a couple of shades of a complementary/accent color to display. Because there is no way in regular css to do color operations or store variables, there was no way to accomplish something like defining a primary color, and have a site theme cascade off of that. However with tools such as LESS, that impossibility becomes a reality! So, if you haven’t guessed it by now, this post is on the creation of a plugin/module/less file to drop into your project, plugin one color, and have your primary theme cascade from it. I only went through the trouble of creating a module for getting Complementary colors. However, it wouldn’t be too much trouble to go through other options such as Triad or Monochromatic to get a module that you could use off of that. Step 1 – Analysis I decided to mimic Adobe Kuler’s Complementary theme algorithm as I liked its simplicity and aesthetics. Color Scheme Designer is great, but I do believe it can give you too many color options, which can lead to chaos and overload. The first thing I had to check was if the complementary values for the color schemes were actually hues rotated by 180 degrees at all times – they aren’t. Apparently Adobe applies some variance to the complementary colors to get colors that are actually more aesthetically appealing to users. So, I opened up Excel and began to plot complementary hues based on rotation in increments of 10: Long story short, I completed the same calculations for Hue, Saturation, and Lightness. For Hue, I only had to record the Complementary hue values, however for saturation and lightness, I had to record the values for ALL of the shades. Since the functions were too complicated to put into LESS since they aren’t constant/linear, but rather interval functions, I instead opted to extrapolate the HSL values using the trendline function for each major interval, onto intervals of spacing 1. For example, using the hue extraction, I got the following values: Interval Function 0-60 60-140 140-270 270-360 Saturation and Lightness were much worse, but in the end, I finally had functions for all of the intervals, and then went the route of just grabbing each shades value in intervals of 1. Step 2 – Mapping I declared variable names for each of these sections as something that shouldn’t ever conflict with a variable someone would define in their own file. After I had each of the values, I extracted the values and put them into files of their own for hue variables, saturation variables, and lightness variables… Example: /*HUE CONVERSIONS*/@clrizr-hue-source-0deg: 133.43;@clrizr-hue-source-1deg: 135.601;@clrizr-hue-source-2deg: 137.772;@clrizr-hue-source-3deg: 139.943;@clrizr-hue-source-4deg: 142.114;.../*SATURATION CONVERSIONS*/@clrizr-saturation-s2SV0px: 0;@clrizr-saturation-s2SV1px: 0;@clrizr-saturation-s2SV2px: 0;@clrizr-saturation-s2SV3px: 0;@clrizr-saturation-s2SV4px: 0;.../*LIGHTNESS CONVERSIONS*/@clrizr-lightness-s2LV0px: 30;@clrizr-lightness-s2LV1px: 31;@clrizr-lightness-s2LV2px: 32;@clrizr-lightness-s2LV3px: 33;@clrizr-lightness-s2LV4px: 34;... In the end, I have 973 lines of mapping/conversion from source HSL to shade HSL for two extra primary shades, and two complementary shades. The last bit of the work was the file to compose each of the shades from these mappings. Step 3 – Clrizr Mapper The final step was the hardest to overcome as I was still trying to understand LESS to its fullest extent. Imports As mentioned previously, I had separated the HSL mappings into different files, so the first necessary step is to import those for use into the Clrizr plugin: @import url("hue.less");@import url("saturation.less");@import url("lightness.less"); Extract Component Values For Each Shade Next, I extracted the necessary information for each shade HSL before shade composition: @clrizr-input-saturation: 1px+floor(saturation(@clrizr-input))-1;@clrizr-input-lightness: 1px+floor(lightness(@clrizr-input))-1; @clrizr-complementary-hue: formatstring("clrizr-hue-source-{0}", ceil(hue(@clrizr-input))); @clrizr-primary-2-saturation: formatstring("clrizr-saturation-s2SV{0}",@clrizr-input-saturation);@clrizr-primary-1-saturation: formatstring("clrizr-saturation-s1SV{0}",@clrizr-input-saturation);@clrizr-complementary-1-saturation: formatstring("clrizr-saturation-c1SV{0}",@clrizr-input-saturation); @clrizr-primary-2-lightness: formatstring("clrizr-lightness-s2LV{0}",@clrizr-input-lightness);@clrizr-primary-1-lightness: formatstring("clrizr-lightness-s1LV{0}",@clrizr-input-lightness);@clrizr-complementary-1-lightness: formatstring("clrizr-lightness-c1LV{0}",@clrizr-input-lightness); Here, you can see a couple of odd things… On the first line, I am using operations to add units to the saturation and lightness. This is due to some limitations in the operations that would give me saturation or lightness in %, which can’t be in a variable name. So, I use first add 1px to it, which casts the result of the following functions as px instead of %, and then at the end, I remove that pixel. You can also see here the formatstring method which is exactly what it sounds like – something like String.Format(string str, params object[] obj). Get Primary & Complementary Shades Now that I have components for each of the different shades, I can now compose them into each of their pieces. For this, I use the @@ operator which will look for a variable with the name specified in a string, and then call that variable: @clrizr-primary-2: hsl(hue(@clrizr-input), @@clrizr-primary-2-saturation, @@clrizr-primary-2-lightness);@clrizr-primary-1: hsl(hue(@clrizr-input), @@clrizr-primary-1-saturation, @@clrizr-primary-1-lightness);@clrizr-primary: @clrizr-input;@clrizr-complementary-1: hsl(@@clrizr-complementary-hue, @@clrizr-complementary-1-saturation, @@clrizr-complementary-1-lightness);@clrizr-complementary-2: hsl(@@clrizr-complementary-hue, saturation(@clrizr-input), lightness(@clrizr-input)); That’s is it, for the most part. These variables now hold the theme for the one input color – @clrizr-input. However, I have one last addition… Perceptive Luminance Well, after I got the colors, I decided I wanted to also get the best font color that would go on top of it. Black or white depending on light or dark color. Now I couldn’t just go with checking the lightness, as that is half the story. You see, the human eye doesn’t see ALL colors equally well but rather has more cells for interpreting green light compared to blue or red. So, using the ratio, we can calculate the perceptive luminance of each of the shades, and get the font color that best matches it! @clrizr-perceptive-luminance-ps2: round(1 - ( (0.299 * red(@clrizr-primary-2) ) + ( 0.587 * green(@clrizr-primary-2) ) + (0.114 * blue(@clrizr-primary-2)))/255)*255;@clrizr-perceptive-luminance-ps1: round(1 - ( (0.299 * red(@clrizr-primary-1) ) + ( 0.587 * green(@clrizr-primary-1) ) + (0.114 * blue(@clrizr-primary-1)))/255)*255;@clrizr-perceptive-luminance-ps: round(1 - ( (0.299 * red(@clrizr-primary) ) + ( 0.587 * green(@clrizr-primary) ) + (0.114 * blue(@clrizr-primary)))/255)*255;@clrizr-perceptive-luminance-pc1: round(1 - ( (0.299 * red(@clrizr-complementary-1)) + ( 0.587 * green(@clrizr-complementary-1)) + (0.114 * blue(@clrizr-complementary-1)))/255)*255;@clrizr-perceptive-luminance-pc2: round(1 - ( (0.299 * red(@clrizr-complementary-2)) + ( 0.587 * green(@clrizr-complementary-2)) + (0.114 * blue(@clrizr-complementary-2)))/255)*255; @clrizr-col-font-on-primary-2: rgb(@clrizr-perceptive-luminance-ps2, @clrizr-perceptive-luminance-ps2, @clrizr-perceptive-luminance-ps2);@clrizr-col-font-on-primary-1: rgb(@clrizr-perceptive-luminance-ps1, @clrizr-perceptive-luminance-ps1, @clrizr-perceptive-luminance-ps1);@clrizr-col-font-on-primary: rgb(@clrizr-perceptive-luminance-ps, @clrizr-perceptive-luminance-ps, @clrizr-perceptive-luminance-ps);@clrizr-col-font-on-complementary-1: rgb(@clrizr-perceptive-luminance-pc1, @clrizr-perceptive-luminance-pc1, @clrizr-perceptive-luminance-pc1);@clrizr-col-font-on-complementary-2: rgb(@clrizr-perceptive-luminance-pc2, @clrizr-perceptive-luminance-pc2, @clrizr-perceptive-luminance-pc2); Conclusion That’s it! I have posted a project on clrizr.codePlex.com for this, and included a testing page for you to test out how it works. Feel free to use it in your own project, and if you have any questions, comments or suggestions, please feel free to leave them here as a comment, or on the contact page!

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SpringMvc java.lang.NullPointerException When Posting Form To Server [closed]

- by dev_darin

I have a form with a user name field on it when i tab out of the field i use a RESTFUL Web Service that makes a call to a handler method in the controller. The method makes a call to a DAO class that checks the database if the user name exists. This works fine, however when the form is posted to the server i call the same exact function i would call in the handler method however i get a java.lang.NullPointerException when it accesses the class that makes a call to the DAO object. So it does not even access the DAO object the second time. I have exception handlers around the calls in all my classes that makes calls. Any ideas as to whats happening here why i would get the java.lang.NullPointerException the second time the function is called.Does this have anything to do with Spring instantiating DAO classes using a Singleton method or something to that effect? What can be done to resolve this? This is what happens the First Time The Method is called using the Web Service(this is suppose to happen): 13011 [http-8084-2] INFO com.crimetrack.jdbc.JdbcOfficersDAO - Inside jdbcOfficersDAO 13031 [http-8084-2] DEBUG org.springframework.jdbc.core.JdbcTemplate - Executing prepared SQL query 13034 [http-8084-2] DEBUG org.springframework.jdbc.core.JdbcTemplate - Executing prepared SQL statement [SELECT userName FROM crimetrack.tblofficers WHERE userName = ?] 13071 [http-8084-2] DEBUG org.springframework.jdbc.datasource.DataSourceUtils - Fetching JDBC Connection from DataSource 13496 [http-8084-2] DEBUG org.springframework.jdbc.core.StatementCreatorUtils - Setting SQL statement parameter value: column index 1, parameter value [adminz], value class [java.lang.String], SQL type unknown 13534 [http-8084-2] DEBUG org.springframework.jdbc.datasource.DataSourceUtils - Returning JDBC Connection to DataSource 13537 [http-8084-2] INFO com.crimetrack.jdbc.JdbcOfficersDAO - No username was found in exception 13537 [http-8084-2] INFO com.crimetrack.service.ValidateUserNameManager - UserName :adminz does NOT exist The Second time When The Form Is 'Post' and a validation method handles the form and calls the same method the web service would call: 17199 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - UserName is not null so going to check if its valid for :adminz 17199 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - User Name in try.....catch block is adminz 17199 [http-8084-2] INFO com.crimetrack.service.ValidateUserNameManager - Inside Do UserNameExist about to validate with username : adminz 17199 [http-8084-2] INFO com.crimetrack.service.ValidateUserNameManager - UserName :adminz EXCEPTION OCCURED java.lang.NullPointerException ValidateUserNameManager.java public class ValidateUserNameManager implements ValidateUserNameIFace { private OfficersDAO officerDao; private final Logger logger = Logger.getLogger(getClass()); public boolean DoesUserNameExist(String userName) throws Exception { logger.info("Inside Do UserNameExist about to validate with username : " + userName); try{ if(officerDao.OfficerExist(userName) == true){ logger.info("UserName :" + userName + " does exist"); return true; }else{ logger.info("UserName :" + userName + " does NOT exist"); return false; } }catch(Exception e){ logger.info("UserName :" + userName + " EXCEPTION OCCURED " + e.toString()); return false; } } /** * @return the officerDao */ public OfficersDAO getOfficerDao() { return officerDao; } /** * @param officerdao the officerDao to set */ public void setOfficerDao(OfficersDAO officerDao) { this.officerDao = officerDao; } } JdbcOfficersDAO.java public boolean OfficerExist(String userName){ String dbUserName; try{ logger.info("Inside jdbcOfficersDAO"); String sql = "SELECT userName FROM crimetrack.tblofficers WHERE userName = ?"; try{ dbUserName = (String)getJdbcTemplate().queryForObject(sql, new Object[]{userName},String.class); logger.info("Just Returned from database"); }catch(Exception e){ logger.info("No username was found in exception"); return false; } if(dbUserName == null){ logger.info("Database did not find any matching records"); } logger.info("after JdbcTemplate"); if (dbUserName.equals(userName)) { logger.info("User Name Exists"); return true; }else{ logger.info("User Name Does NOT Exists"); return false; } }catch(Exception e){ logger.info("Exception Message in JdbcOfficersDAO is "+e.getMessage()); return false; } } OfficerRegistrationValidation.java public class OfficerRegistrationValidation implements Validator{ private final Logger logger = Logger.getLogger(getClass()); private ValidateUserNameManager validateUserNameManager; public boolean supports(Class<?> clazz) { return Officers.class.equals(clazz); } public void validate(Object target, Errors errors) { Officers officer = (Officers) target; if (officer.getUserName() == null){ errors.rejectValue("userName", "userName.required"); }else{ String userName = officer.getUserName(); logger.info("UserName is not null so going to check if its valid for :" + userName); try { logger.info("User Name in try.....catch block is " + userName); if (validateUserNameManager.DoesUserNameExist(userName)== true){ errors.rejectValue("userName", "userName.exist"); } } catch (Exception e) { logger.info("Error Occured When validating UserName"); errors.rejectValue("userName", "userName.error"); } } if(officer.getPassword()== null){ errors.rejectValue("password", "password.required"); } if(officer.getPassword2()== null){ errors.rejectValue("password2", "password2.required"); } if(officer.getfName() == null){ errors.rejectValue("fName","fName.required"); } if(officer.getlName() == null){ errors.rejectValue("lName", "lName.required"); } if (officer.getoName() == null){ errors.rejectValue("oName", "oName.required"); } if (officer.getEmailAdd() == null){ errors.rejectValue("emailAdd", "emailAdd.required"); } if (officer.getDob() == null){ errors.rejectValue("dob", "dob.required"); } if (officer.getGenderId().equals("A")){ errors.rejectValue("genderId","genderId.required"); } if(officer.getDivisionNo() == 1){ errors.rejectValue("divisionNo", "divisionNo.required"); } if(officer.getPositionId() == 1){ errors.rejectValue("positionId", "positionId.required"); } if (officer.getStartDate() == null){ errors.rejectValue("startDate","startDate.required"); } if(officer.getEndDate() == null){ errors.rejectValue("endDate","endDate.required"); } logger.info("The Gender ID is " + officer.getGenderId().toString()); if(officer.getPhoneNo() == null){ errors.rejectValue("phoneNo", "phoneNo.required"); } } /** * @return the validateUserNameManager */ public ValidateUserNameManager getValidateUserNameManager() { return validateUserNameManager; } /** * @param validateUserNameManager the validateUserNameManager to set */ public void setValidateUserNameManager( ValidateUserNameManager validateUserNameManager) { this.validateUserNameManager = validateUserNameManager; } } Update Error Log using Logger.Error("Message", e): 39024 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - UserName is not null so going to check if its valid for :adminz 39025 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - User Name in try.....catch block is adminz 39025 [http-8084-2] ERROR com.crimetrack.service.OfficerRegistrationValidation - Message java.lang.NullPointerException at com.crimetrack.service.OfficerRegistrationValidation.validate(OfficerRegistrationValidation.java:47) at org.springframework.validation.DataBinder.validate(DataBinder.java:725) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.doBind(HandlerMethodInvoker.java:815) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.resolveHandlerArguments(HandlerMethodInvoker.java:367) at org.springframework.web.bind.annotation.support.HandlerMethodInvoker.invokeHandlerMethod(HandlerMethodInvoker.java:171) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.invokeHandlerMethod(AnnotationMethodHandlerAdapter.java:436) at org.springframework.web.servlet.mvc.annotation.AnnotationMethodHandlerAdapter.handle(AnnotationMethodHandlerAdapter.java:424) at org.springframework.web.servlet.DispatcherServlet.doDispatch(DispatcherServlet.java:923) at org.springframework.web.servlet.DispatcherServlet.doService(DispatcherServlet.java:852) at org.springframework.web.servlet.FrameworkServlet.processRequest(FrameworkServlet.java:882) at org.springframework.web.servlet.FrameworkServlet.doPost(FrameworkServlet.java:789) at javax.servlet.http.HttpServlet.service(HttpServlet.java:637) at javax.servlet.http.HttpServlet.service(HttpServlet.java:717) at org.apache.catalina.core.ApplicationFilterChain.internalDoFilter(ApplicationFilterChain.java:290) at org.apache.catalina.core.ApplicationFilterChain.doFilter(ApplicationFilterChain.java:206) at org.apache.catalina.core.StandardWrapperValve.invoke(StandardWrapperValve.java:233) at org.apache.catalina.core.StandardContextValve.invoke(StandardContextValve.java:191) at org.apache.catalina.core.StandardHostValve.invoke(StandardHostValve.java:127) at org.apache.catalina.valves.ErrorReportValve.invoke(ErrorReportValve.java:102) at org.apache.catalina.core.StandardEngineValve.invoke(StandardEngineValve.java:109) at org.apache.catalina.connector.CoyoteAdapter.service(CoyoteAdapter.java:293) at org.apache.coyote.http11.Http11Processor.process(Http11Processor.java:859) at org.apache.coyote.http11.Http11Protocol$Http11ConnectionHandler.process(Http11Protocol.java:602) at org.apache.tomcat.util.net.JIoEndpoint$Worker.run(JIoEndpoint.java:489) at java.lang.Thread.run(Unknown Source) 39025 [http-8084-2] INFO com.crimetrack.service.OfficerRegistrationValidation - Error Occured When validating UserName

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Passing a parameter so that it cannot be changed – C#

- by nmarun

I read this requirement of not allowing a user to change the value of a property passed as a parameter to a method. In C++, as far as I could recall (it’s been over 10 yrs, so I had to refresh memory), you can pass ‘const’ to a function parameter and this ensures that the parameter cannot be changed inside the scope of the function. There’s no such direct way of doing this in C#, but that does not mean it cannot be done!! Ok, so this ‘not-so-direct’ technique depends on the type of the parameter – a simple property or a collection. Parameter as a simple property: This is quite easy (and you might have guessed it already). Bulent Ozkir clearly explains how this can be done here. Parameter as a collection property: Obviously the above does not work if the parameter is a collection of some type. Let’s dig-in. Suppose I need to create a collection of type KeyTitle as defined below. 1: public class KeyTitle 2: { 3: public int Key { get; set; } 4: public string Title { get; set; } 5: } My class is declared as below: 1: public class Class1 2: { 3: public Class1() 4: { 5: MyKeyTitleList = new List<KeyTitle>(); 6: } 7: 8: public List<KeyTitle> MyKeyTitleList { get; set; } 9: public ReadOnlyCollection<KeyTitle> ReadonlyKeyTitleCollection 10: { 11: // .AsReadOnly creates a ReadOnlyCollection<> type 12: get { return MyKeyTitleList.AsReadOnly(); } 13: } 14: } See the .AsReadOnly() method used in the second property? As MSDN says it: “Returns a read-only IList<T> wrapper for the current collection.” Knowing this, I can implement my code as: 1: public static void Main() 2: { 3: Class1 class1 = new Class1(); 4: class1.MyKeyTitleList.Add(new KeyTitle { Key = 1, Title = "abc" }); 5: class1.MyKeyTitleList.Add(new KeyTitle { Key = 2, Title = "def" }); 6: class1.MyKeyTitleList.Add(new KeyTitle { Key = 3, Title = "ghi" }); 7: class1.MyKeyTitleList.Add(new KeyTitle { Key = 4, Title = "jkl" }); 8: 9: TryToModifyCollection(class1.MyKeyTitleList.AsReadOnly()); 10: 11: Console.ReadLine(); 12: } 13: 14: private static void TryToModifyCollection(ReadOnlyCollection<KeyTitle> readOnlyCollection) 15: { 16: // can only read 17: for (int i = 0; i < readOnlyCollection.Count; i++) 18: { 19: Console.WriteLine("{0} - {1}", readOnlyCollection[i].Key, readOnlyCollection[i].Title); 20: } 21: // Add() - not allowed 22: // even the indexer does not have a setter 23: } The output is as expected: The below image shows two things. In the first line, I’ve tried to access an element in my read-only collection through an indexer. It shows that the ReadOnlyCollection<> does not have a setter on the indexer. The second line tells that there’s no ‘Add()’ method for this type of collection. The capture below shows there’s no ‘Remove()’ method either, there-by eliminating all ways of modifying a collection. Mission accomplished… right? Now, even if you have a collection of different type, all you need to do is to somehow cast (used loosely) it to a List<> and then do a .AsReadOnly() to get a ReadOnlyCollection of your custom collection type. As an example, if you have an IDictionary<int, string>, you can create a List<T> of this type with a wrapper class (KeyTitle in our case). 1: public IDictionary<int, string> MyDictionary { get; set; } 2: 3: public ReadOnlyCollection<KeyTitle> ReadonlyDictionary 4: { 5: get 6: { 7: return (from item in MyDictionary 8: select new KeyTitle 9: { 10: Key = item.Key, 11: Title = item.Value, 12: }).ToList().AsReadOnly(); 13: } 14: } Cool huh? Just one thing you need to know about the .AsReadOnly() method is that the only way to modify your ReadOnlyCollection<> is to modify the original collection. So doing: 1: public static void Main() 2: { 3: Class1 class1 = new Class1(); 4: class1.MyKeyTitleList.Add(new KeyTitle { Key = 1, Title = "abc" }); 5: class1.MyKeyTitleList.Add(new KeyTitle { Key = 2, Title = "def" }); 6: class1.MyKeyTitleList.Add(new KeyTitle { Key = 3, Title = "ghi" }); 7: class1.MyKeyTitleList.Add(new KeyTitle { Key = 4, Title = "jkl" }); 8: TryToModifyCollection(class1.MyKeyTitleList.AsReadOnly()); 9: 10: Console.WriteLine(); 11: 12: class1.MyKeyTitleList.Add(new KeyTitle { Key = 5, Title = "mno" }); 13: class1.MyKeyTitleList[2] = new KeyTitle{Key = 3, Title = "GHI"}; 14: TryToModifyCollection(class1.MyKeyTitleList.AsReadOnly()); 15: 16: Console.ReadLine(); 17: } Gives me the output of: See that the second element’s Title is changed to upper-case and the fifth element also gets displayed even though we’re still looping through the same ReadOnlyCollection<KeyTitle>. Verdict: Now you know of a way to implement ‘Method(const param1)’ in your code!

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Loaded OBJ Model Will Not Display in OpenGL / C++ Project

- by Drake Summers

I have been experimenting with new effects in game development. The programs I have written have been using generic shapes for the visuals. I wanted to test the effects on something a bit more complex, and wrote a resource loader for Wavefront OBJ files. I started with a simple cube in blender, exported it to an OBJ file with just vertices and triangulated faces, and used it to test the resource loader. I could not get the mesh to show up in my application. The loader never gave me any errors, so I wrote a snippet to loop through my vertex and index arrays that were returned from the loader. The data is exactly the way it is supposed to be. So I simplified the OBJ file by editing it directly to just show a front facing square. Still, nothing is displayed in the application. And don't worry, I did check to make sure that I decreased the value of each index by one while importing the OBJ. - BEGIN EDIT I also tested using glDrawArrays(GL_TRIANGLES, 0, 3 ); to draw the first triangle and it worked! So the issue could be in the binding of the VBO/IBO items. END EDIT - INDEX/VERTEX ARRAY OUTPUT: GLOBALS AND INITIALIZATION FUNCTION: GLuint program; GLint attrib_coord3d; std::vector<GLfloat> vertices; std::vector<GLushort> indices; GLuint vertexbuffer, indexbuffer; GLint uniform_mvp; int initialize() { if (loadModel("test.obj", vertices, indices)) { GLfloat myverts[vertices.size()]; copy(vertices.begin(), vertices.end(), myverts); GLushort myinds[indices.size()]; copy(indices.begin(), indices.end(), myinds); glGenBuffers(1, &vertexbuffer); glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); glBufferData(GL_ARRAY_BUFFER, sizeof(myverts), myverts, GL_STATIC_DRAW); glGenBuffers(1, &indexbuffer); glBindBuffer(GL_ARRAY_BUFFER, indexbuffer); glBufferData(GL_ELEMENT_ARRAY_BUFFER, sizeof(myinds), myinds, GL_STATIC_DRAW); // OUTPUT DATA FROM NEW ARRAYS TO CONSOLE // ERROR HANDLING OMITTED FOR BREVITY } GLint link_result = GL_FALSE; GLuint vert_shader, frag_shader; if ((vert_shader = create_shader("tri.v.glsl", GL_VERTEX_SHADER)) == 0) return 0; if ((frag_shader = create_shader("tri.f.glsl", GL_FRAGMENT_SHADER)) == 0) return 0; program = glCreateProgram(); glAttachShader(program, vert_shader); glAttachShader(program, frag_shader); glLinkProgram(program); glGetProgramiv(program, GL_LINK_STATUS, &link_result); // ERROR HANDLING OMITTED FOR BREVITY const char* attrib_name; attrib_name = "coord3d"; attrib_coord3d = glGetAttribLocation(program, attrib_name); // ERROR HANDLING OMITTED FOR BREVITY const char* uniform_name; uniform_name = "mvp"; uniform_mvp = glGetUniformLocation(program, uniform_name); // ERROR HANDLING OMITTED FOR BREVITY return 1; } RENDERING FUNCTION: glm::mat4 model = glm::translate(glm::mat4(1.0f), glm::vec3(0.0, 0.0, -4.0)); glm::mat4 view = glm::lookAt(glm::vec3(0.0, 0.0, 4.0), glm::vec3(0.0, 0.0, 3.0), glm::vec3(0.0, 1.0, 0.0)); glm::mat4 projection = glm::perspective(45.0f, 1.0f*(screen_width/screen_height), 0.1f, 10.0f); glm::mat4 mvp = projection * view * model; int size; glUseProgram(program); glUniformMatrix4fv(uniform_mvp, 1, GL_FALSE, glm::value_ptr(mvp)); glClearColor(0.5, 0.5, 0.5, 1.0); glClear(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT); glEnableVertexAttribArray(attrib_coord3d); glBindBuffer(GL_ARRAY_BUFFER, vertexbuffer); glVertexAttribPointer(attrib_coord3d, 3, GL_FLOAT, GL_FALSE, 0, 0); glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, indexbuffer); glGetBufferParameteriv(GL_ELEMENT_ARRAY_BUFFER, GL_BUFFER_SIZE, &size); glDrawElements(GL_TRIANGLES, size/sizeof(GLushort), GL_UNSIGNED_SHORT, 0); glDisableVertexAttribArray(attrib_coord3d); VERTEX SHADER: attribute vec3 coord3d; uniform mat4 mvp; void main(void) { gl_Position = mvp * vec4(coord3d, 1.0); } FRAGMENT SHADER: void main(void) { gl_FragColor[0] = 0.0; gl_FragColor[1] = 0.0; gl_FragColor[2] = 1.0; gl_FragColor[3] = 1.0; } OBJ RESOURCE LOADER: bool loadModel(const char * path, std::vector<GLfloat> &out_vertices, std::vector<GLushort> &out_indices) { std::vector<GLfloat> temp_vertices; std::vector<GLushort> vertexIndices; FILE * file = fopen(path, "r"); // ERROR HANDLING OMITTED FOR BREVITY while(1) { char lineHeader[128]; int res = fscanf(file, "%s", lineHeader); if (res == EOF) { break; } if (strcmp(lineHeader, "v") == 0) { float _x, _y, _z; fscanf(file, "%f %f %f\n", &_x, &_y, &_z ); out_vertices.push_back(_x); out_vertices.push_back(_y); out_vertices.push_back(_z); } else if (strcmp(lineHeader, "f") == 0) { unsigned int vertexIndex[3]; int matches = fscanf(file, "%d %d %d\n", &vertexIndex[0], &vertexIndex[1], &vertexIndex[2]); out_indices.push_back(vertexIndex[0] - 1); out_indices.push_back(vertexIndex[1] - 1); out_indices.push_back(vertexIndex[2] - 1); } else { ... } } // ERROR HANDLING OMITTED FOR BREVITY return true; } I can edit the question to provide any further info you may need. I attempted to provide everything of relevance and omit what may have been unnecessary. I'm hoping this isn't some really poor mistake, because I have been at this for a few days now. If anyone has any suggestions or advice on the matter, I look forward to hearing it. As a final note: I added some arrays into the code with manually entered data, and was able to display meshes by using those arrays instead of the generated ones. I do not understand!

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#include file vs iframe or is there a better way

- by Laurence Burke

ok simple question about including large mostly static html and asp.net code I am using as of right now #include and I was wondering if iframes would be a better way of handling what I wish to do or is there a better way to do it. here is the current way i'm handling the includes default.aspx <head id="YafHead" runat="server"> <meta id="YafMetaDescription" runat="server" name="description" content="Yet Another Forum.NET -- A bulletin board system written in ASP.NET" /> <meta id="YafMetaKeywords" runat="server" name="keywords" content="Yet Another Forum.net, Forum, ASP.NET, BB, Bulletin Board, opensource" /> <title>Forums</title> <style type="text/css"> .sbutton { background-color:#361800; border:medium none; border-collapse:collapse; color:#FFFFFF; font-family:Tahoma,Arial,Helvetica; font-size:10px; font-weight:bold; vertical-align:middle; } </style> <link href="images/favicon.ico" type="image/ico" rel="shortcut icon" /> <link rel="stylesheet" href="navTopStyle.css" type="text/css" media="screen" /> </head> <body style="margin: 0"> <form id="form1" runat="server" enctype="multipart/form-data"> <table align="center" style="background-color: #ffffff" cellpadding="0" cellspacing="0" width="790px"> <tr> <td>  </td> </tr> <tr> <td> <YAF:Forum runat="server" ID="forum"></YAF:Forum> </td> </tr> </table> </form> </body> </html> CComHeader.html <table cellpadding="0" cellspacing="0" width="790px"> <tr> <td align="left"> <img src="images/smokechair.jpg" alt="Cigar.com" /><img src="images/cigarcomTitle.gif" alt="Cigar.com" /> </td> <td align="right"> <table width="310px" height="73px" cellpadding="0" cellspacing="0" style="padding-right: 6px"> <tr> <td width="109px" class="welcome" align="left"> Welcome to Cigar.com </td> <td width="195px" class="welcome" align="left"> <div runat="server" id="divUser"> <table cellpadding="0" cellspacing="0" align="right"> <tr> <td width="126px" align="left"> <asp:Label ID="lblUserName" CssClass="welcome" runat="server"></asp:Label></td> <td width="65px" align="left"> <a href="http://www.cigar.com/cs/languages/en-US/docs/faq.aspx">Help</a></td> </tr> </table> </div> <div runat="server" id="divGuest"> <a href="OutsideLogin.aspx">Sign In</a> | <a href="OutsideLogin.aspx">Join</a> | <a href="http://www.cigar.com/cs/languages/en-US/docs/faq.aspx">Help</a> </div> </td> </tr> <tr> <td colspan="2"> <table cellpadding="0" cellspacing="0" > <tr> <td width="234px" align="right"> <asp:DropDownList ID="ddlCriteria" runat="server"> <asp:ListItem>Posts</asp:ListItem> <asp:ListItem>Posted By</asp:ListItem> </asp:DropDownList> <asp:TextBox Width="120px" ID="txtSearch" runat="server"></asp:TextBox> </td> <td width="70px" align="center"> <asp:Button ID="btnSearch" runat="server" Text="Search" CssClass="sbutton" OnClick="btnSearch_Click" /> </td> </tr> </table> </td> </tr> </table> </td> </tr> <tr> <td colspan="2">  </td> </tr> </table> commonTabBar.html <%-- CommonTabBar firebugged from Cigar.com--%> <div class="CommonTabBar"> <script language="javascript"> function tabOver(e) { if (e.className != 'CommonSimpleTabStripSelectedTab') e.className = 'CommonSimpleTabStripTabHover'; } function tabOut(e) { if (e.className != 'CommonSimpleTabStripSelectedTab') e.className = 'CommonSimpleTabStripTab'; } function tabOverSub(e) { if (e.className != 'CommonSimpleTabStripSelectedTabSub') e.className = 'CommonSimpleTabStripTabHoverSub'; } function tabOutSub(e) { if (e.className != 'CommonSimpleTabStripSelectedTabSub') e.className = 'CommonSimpleTabStripTabSub'; } </script> <table border="0" cellpadding="0" cellspacing="0"> <tbody> <tr valign="middle"> <td class="CommonSimpleTabStripTab" style="padding: 0px">   </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this);" onmouseout="tabOut(this);" onclick="window.location = 'http://www.cigar.com/index.asp'"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/index.asp"> Home</a> </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this); document.getElementById('ComDropDown2').style.display = 'inline';" onmouseout="tabOut(this); document.getElementById('ComDropDown2').style.display = 'none';"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/cigars/index.asp"> Cigars</a> <div id="ComDropDown2" style="border: 1px solid rgb(71, 42, 24); margin: 28px 0px 0px; display: none; background-color: rgb(235, 230, 208); color: rgb(71, 42, 24); position: absolute; float: left; z-index: 200;" onmouseover="document.getElementById('ComDropDown2').style.display = 'inline';" onmouseout="document.getElementById('ComDropDown2').style.display = 'none';"> <ul style="margin: 0px; padding: 0px; width: 100px;"> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/index.asp'"><a href="http://www.cigar.com/cigars/index.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="BrandsLink">Brands </a> </li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/privatelabel.asp?brand=419'"> <a href="http://www.cigar.com/cigars/privatelabel.asp?brand=419" style="line-height: 25px; color: rgb(71, 42, 24);" id="SamplersLink">Aging Room </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/samplers.asp'"><a href="http://www.cigar.com/cigars/samplers.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="SamplersLink">Samplers </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/suggestions.asp'"><a href="http://www.cigar.com/cigars/suggestions.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="SuggestionsLink">Suggestions </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/DailyDeal/ccCigarDeals.asp'"><a href="http://www.cigar.com/DailyDeal/ccCigarDeals.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="SuggestionsLink">Suggestions </a></li> </ul> </div> </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this); document.getElementById('ComDropDown3').style.display = 'inline';" onmouseout="tabOut(this); document.getElementById('ComDropDown3').style.display = 'none';"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/cigars/samplers.asp"> Samplers</a> <div id="ComDropDown3" style="border: 1px solid rgb(71, 42, 24); margin: 28px 0px 0px; display: none; background-color: rgb(235, 230, 208); color: rgb(71, 42, 24); position: absolute; float: left; z-index: 200;" onmouseover="document.getElementById('ComDropDown3').style.display = 'inline';" onmouseout="document.getElementById('ComDropDown3').style.display = 'none';"> <ul style="margin: 0px; padding: 0px; width: 100px;"> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/viewsamplers.asp?subcatid=samp_var'"> <a href="http://www.cigar.com/cigars/viewsamplers.asp?subcatid=samp_var" style="line-height: 25px; color: rgb(71, 42, 24);" id="Variety SamplersLink">Variety Samplers </a> </li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/viewsamplers.asp?subcatid=gift_samp'"> <a href="http://www.cigar.com/cigars/viewsamplers.asp?subcatid=gift_samp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Gift SamplersLink">Gift Samplers </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/createSampler.asp'"><a href="http://www.cigar.com/cigars/createSampler.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Custom SamplerLink">Custom Sampler </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/viewsamplers.asp?subcatid=Feat%20Samp'"> <a href="http://www.cigar.com/cigars/viewsamplers.asp?subcatid=Feat%20Samp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Featured SamplersLink">Featured Samplers </a> </li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/YouPickOffer.asp'"><a href="http://www.cigar.com/cigars/YouPickOffer.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Brand SamplersLink">U Pick 2 Offer </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/exclusiveCustomSampler.asp'"> <a href="http://www.cigar.com/cigars/exclusiveCustomSampler.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Brand SamplersLink">Gurkha Sampler </a></li> </ul> </div> </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this); document.getElementById('ComDropDown4').style.display = 'inline';" onmouseout="tabOut(this); document.getElementById('ComDropDown4').style.display = 'none';"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/gifts/index.asp"> Gifts</a> <div id="ComDropDown4" style="border: 1px solid rgb(71, 42, 24); margin: 28px 0px 0px; display: none; background-color: rgb(235, 230, 208); color: rgb(71, 42, 24); position: absolute; float: left; z-index: 200;" onmouseover="document.getElementById('ComDropDown4').style.display = 'inline';" onmouseout="document.getElementById('ComDropDown4').style.display = 'none';"> <ul style="margin: 0px; padding: 0px; width: 100px;"> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/gifts/viewgifts.asp?subcatid=gift_sets'"> <a href="http://www.cigar.com/gifts/viewgifts.asp?subcatid=gift_sets" style="line-height: 25px; color: rgb(71, 42, 24);" id="Gift SetsLink">Best Sellers </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cigars/viewsamplers.asp?subcatid=gift_samp'"> <a href="http://www.cigar.com/cigars/viewsamplers.asp?subcatid=gift_samp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Gift SamplersLink">Gift Samplers </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/index.asp'"><a href="http://www.cigar.com/accessories/index.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="AccesoriesLink">Accesories </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/club/index.asp'"><a href="http://www.cigar.com/club/index.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Cigar of the MonthLink">Cigar of the Month </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/gifts/certificates.asp'"><a href="http://www.cigar.com/gifts/certificates.asp" style="line-height: 25px; color: rgb(71, 42, 24);" id="Cigar of the MonthLink">Gift Certificates </a></li> </ul> </div> </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this); document.getElementById('ComDropDown5').style.display = 'inline';" onmouseout="tabOut(this); document.getElementById('ComDropDown5').style.display = 'none';"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/accessories/index.asp"> Accessories</a> <div id="ComDropDown5" style="border: 1px solid rgb(71, 42, 24); margin: 28px 0px 0px; display: none; background-color: rgb(235, 230, 208); color: rgb(71, 42, 24); position: absolute; float: left; z-index: 200;" onmouseover="document.getElementById('ComDropDown5').style.display = 'inline';" onmouseout="document.getElementById('ComDropDown5').style.display = 'none';"> <ul style="margin: 0px; padding: 0px; width: 100px;"> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_hum'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_hum" style="line-height: 25px; color: rgb(71, 42, 24);" id="HumidorsLink">Humidors </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_cutt'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_cutt" style="line-height: 25px; color: rgb(71, 42, 24);" id="CuttersLink">Cutters </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_lite'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_lite" style="line-height: 25px; color: rgb(71, 42, 24);" id="LightersLink">Lighters </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_case'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_case" style="line-height: 25px; color: rgb(71, 42, 24);" id="CasesLink">Cases </a> </li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_humf'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_humf" style="line-height: 25px; color: rgb(71, 42, 24);" id="HumidificationLink">Humidification </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_book'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_book" style="line-height: 25px; color: rgb(71, 42, 24);" id="BooksLink">Books </a> </li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_ash'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_ash" style="line-height: 25px; color: rgb(71, 42, 24);" id="AshtraysLink">Ashtrays </a></li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_misc'"> <a href="http://www.cigar.com/accessories/viewaccessories.asp?subcatid=acc_misc" style="line-height: 25px; color: rgb(71, 42, 24);" id="OtherLink">Other </a> </li> </ul> </div> </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this);" onmouseout="tabOut(this);" onclick="window.location = 'http://www.cigar.com/sales/index.asp'"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/sales/index.asp"> Sales</a> </td> <td class="CommonSimpleTabStripTab" onmouseover="tabOver(this); document.getElementById('ComDropDown8').style.display = 'inline';" onmouseout="tabOut(this); document.getElementById('ComDropDown8').style.display = 'none';"> <a style="float: right; display: block; height: 30px; line-height: 30px; padding-left: 12px; padding-right: 12px; vertical-align: middle;" href="http://www.cigar.com/cs/">Community</a> <div id="ComDropDown8" style="border: 1px solid rgb(71, 42, 24); margin: 28px 0px 0px; display: none; background-color: rgb(235, 230, 208); color: rgb(71, 42, 24); position: absolute; float: left; z-index: 200;" onmouseover="document.getElementById('ComDropDown8').style.display = 'inline';" onmouseout="document.getElementById('ComDropDown8').style.display = 'none';"> <ul style="margin: 0px; padding: 0px; width: 100px;"> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cs/forums/'"><a href="http://www.cigar.com/cs/forums/" style="line-height: 25px; color: rgb(71, 42, 24);" id="ForumsLink">Forums </a> </li> <li class="CommonSimpleTabStripTabSub" style="margin: 0px; padding: 3px; text-align: left; list-style: none outside none;" onmouseover="tabOverSub(this); " onmouseout="tabOutSub(this); " onclick="window.location = 'http://www.cigar.com/cs/blogs/'"><a href="http://w

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jQuery hover menu not disappearing

- by Nathan Loding

I have a basic menu using some nested UL's, which is pretty standard I think. When hovering over an LI from the "root" menu, I want the UL within that LI to display. Move the mouse off or to another LI, it shows that submenu. Move down to the submenu and it stays while you hover over each element. I had it working with a simple jQuery.hover() set, but then I ran into issues. When on a page, the "root" menu item is given a class of 'current-page' and if that class exists, I want it to display that submenu statically after a mouseout. Hope I explained that well enough. I just tossed a variable into the hover functions so on the mouseout it ran a .show() on the current-page's submenu. Easy. Except that when I move the mouse between the individual LI's of the submenu, it changes back to the current-page submenu. So I attempted to add a timer element based on another question here. That made things worse -- now the submenus just don't disappear. Here's my CSS, markup, and JS ... how the heck do I make this work properly? Markup: <div id="menu"> <div id="navbar"> <ul id="firstmenu"> <li> <a href="http://localhost/site/pageone">page one</a> <ul class="submenu"> <li><a href="http://localhost/site/pageone/subone">subone</a></li> <li><a href="http://localhost/site/pageone/subtwo">subtwo</a></li> <li><a href="http://localhost/site/pageone/subthree">subthree</a></li> <li><a href="http://localhost/site/pageone/subfour">subfour</a></li> <li><a href="http://localhost/site/pageone/subfive">subfive</a></li> </ul> </li> <li> <a href="http://localhost/site/pagetwo">barely there</a> <ul class="submenu"> <li><a href="http://localhost/site/pageone/subone">subone</a></li> <li><a href="http://localhost/site/pageone/subtwo">subtwo</a></li> <li><a href="http://localhost/site/pageone/subthree">subthree</a></li> <li><a href="http://localhost/site/pageone/subfour">subfour</a></li> <li><a href="http://localhost/site/pageone/subfive">subfive</a></li> </ul> </li> <li class="current-page"> <a href="http://localhost/site/pagetwo">kith & kin</a> <ul class="submenu"> <li><a href="http://localhost/site/pageone/subone">subone</a></li> <li><a href="http://localhost/site/pageone/subtwo">subtwo</a></li> <li><a href="http://localhost/site/pageone/subthree">subthree</a></li> <li><a href="http://localhost/site/pageone/subfour">subfour</a></li> <li><a href="http://localhost/site/pageone/subfive">subfive</a></li> </ul> </li> <li> <a href="http://localhost/site/pagethree">focal point</a> <ul class="submenu"> <li><a href="http://localhost/site/pageone/subone">subone</a></li> <li><a href="http://localhost/site/pageone/subtwo">subtwo</a></li> <li><a href="http://localhost/site/pageone/subthree">subthree</a></li> <li><a href="http://localhost/site/pageone/subfour">subfour</a></li> <li><a href="http://localhost/site/pageone/subfive">subfive</a></li> </ul> </li> <li> <a href="http://localhost/site/pagefour">products</a> <ul class="submenu"> <li><a href="http://localhost/site/pageone/subone">subone</a></li> <li><a href="http://localhost/site/pageone/subtwo">subtwo</a></li> <li><a href="http://localhost/site/pageone/subthree">subthree</a></li> <li><a href="http://localhost/site/pageone/subfour">subfour</a></li> <li><a href="http://localhost/site/pageone/subfive">subfive</a></li> </ul> </li> <li> <a href="http://localhost/site/pagefive">clients</a> </li> </ul> </div></div> And here's the CSS: #navbar { margin: 0; padding: 0; border: 0; text-align: center; } #firstmenu { margin: 6px auto 0 auto; font-size: 16px; list-style-type: none; letter-spacing: -1px; } #firstmenu li { display: inline; position:relative; overflow: hidden; text-align: center; margin-right: 10px; padding: 5px 15px; } #firstmenu a { text-decoration: none; outline: none; color: black; font-weight: 700; width: 75px; cursor: pointer; } .current-page { color: white; background: url(../images/down_arrow.png) bottom center no-repeat; } .current-page a { color: white; border-bottom: 1px solid black; } #firstmenu .current-page a { color: white; } #firstmenu li.hover { color: white; background: url(../images/down_arrow.png) bottom center no-repeat; } #firstmenu li.hover a { color: white; border-bottom: 1px solid black; } #firstmenu li ul li.hover { color: white; background: none; } #firstmenu li ul li.hover a { color: white; border-bottom: none; text-decoration: underline; } #firstmenu li ul { width: 900px; color: white; font-size: .8em; margin-top: 3px; padding: 5px; position: absolute; display: none; } #firstmenu li ul li { list-style: none; display: inline; width: auto; } #firstmenu li ul li a { color: white; font-weight: normal; border: none; } .sub-current-page { font-weight: bold; text-decoration: underline; } #firstmenu li ul li.sub-current-page a { font-weight: bold; } And lastly, my not-at-all-working JS (this is in a $(document).ready(), of course): // Initialize some variables var hideSubmenuTimer = null; var current_page; $('.current-page ul:first').show(); // Prep the menu $('#firstmenu li').hover(function() { // Clear the timeout if it exists if(hideSubmenuTimer) { clearTimeout(hideSubmenuTimer); } // Check if there's a current-page class set if($('li.current-page').length > 0) { current_page = $('li.current-page'); } else { current_page = false; } // If there's a current-page class, hide it if(current_page) { current_page.children('ul:first').hide(); } // Show the new submenu $(this).addClass('hover').children('ul:first').show(); }, function(){ // Just in case var self = this; // Clear the timeout if it exists if(hideSubmenuTimer) { clearTimeout(hideSubmenuTimer); } // Check if there's a current-page class set if($('li.current-page').length > 0) { current_page = $('li.current-page'); } else { current_page = false; } // Set a timeout on hiding the submenu hideSubmenuTimer = setTimeout(function() { // Hide the old submenu $(self).removeClass('hover').children('ul').hide(); // If there's a current-page class, show it if(current_page) { current_page.children('ul:first').show(); current_page.css('color', 'white'); } }, 500); }); So what am I doing so wrong? As a side note, I'm using the $('.current-page ul:first').show() because if I gave .current-page any "display" setting in the CSS, it positioned it really weirdly on the page.

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jQuery Datatables throws error when dynamically created row headers

- by JM4

I am using the Datatables jquery plugin for one of my projects. For one in particular, the number of columns can vary based on how many children a consumer has (yes I realize normalization and proper technique would insert on another row but it is a client requirement). Datatables must be set up as such: <table> <thead> <tr> <th></th> </tr> </thead> <tbody> <tr> <td></td> </tr> </tbody> </table> my script starts out as: <table cellpadding="0" cellspacing="0" border="0" class="display" id="sortable"> <thead> <tr> <th>parent name</th> <th>parent phone</th> <?php try { $db->beginTransaction(); $stmt = $db->prepare("SELECT max(num_deps) FROM (SELECT count(a.id) as num_deps FROM children a INNER JOIN parents b USING(id) WHERE a.id !=0 GROUP BY a.id) x"); $stmt->execute(); $rows = $stmt->fetchAll(); for($i=1; $i<=$rows[0][0]; $i++) { echo " <th>Child Name ".$i."</th> <th>Date of Birth ".$i."</th> "; } $db->commit(); } catch (PDOException $e) { echo "<p align='center'>There was a system error. Please contact administration.<br>".$e->getMessage()."</p><br />"; } ?> </tr> </thead> In this manner, the final column headers can be 1 or 50 spots long. However, with this dynamic code in place, datatables throws the following error: ""DataTables warning (table id = 'datatable'): Cannot reinitialise DataTable. To retrieve the DataTables object for this table, please pass either no arguments to the dataTable() function, or set bRetrive to true. Alternativly, to destroy old table and create a new one...ETC."' Yes I have set "bRetrieve" : true in the javascript above and that does not do the trick. If I remove the code above, the file "works" fine but it leaves off the necessary columns for my table. Any ideas? Displaying JS <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.6/jquery-ui.min.js"></script> <script type="text/javascript" src="../media/js/jquery.dataTables.min.js"></script> <script type="text/javascript" src="../media/js/TableTools/TableTools.js"></script> <script type="text/javascript" src="../media/ZeroClipboard/ZeroClipboard.js"></script> <script type="text/javascript"> $(document).ready(function() { TableToolsInit.sSwfPath = "../media/swf/ZeroClipboard.swf"; oTable = $('#sortable').dataTable({ "bRetrieve": true, "bProcessing": true, "sScrollX": "100%", "sScrollXInner": "110%", "bScrollCollapse": true, "bJQueryUI": true, "sPaginationType": "full_numbers", "sDom": 'T<"clear"><"fg-toolbar ui-widget-header ui-corner-tl ui-corner-tr ui-helper-clearfix"lfr>t<"fg-toolbar ui-widget-header ui-corner-bl ui-corner-br ui-helper-clearfix"ip>' }); }); </script> </head> TOP piece of HTML <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <head> <title>Home</title> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8" /> <link rel="stylesheet" type="text/css" href="style.css" /> <link rel="stylesheet" type="text/css" href="default.css" /> <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jquery/1.4.3/jquery.min.js"></script> <style type="text/css" title="currentStyle"> @import "TableTools.css"; @import "demo_table_jui.css"; @import "jquery-ui-1.8.4.custom.css"; </style> <script type="text/javascript" src="//ajax.googleapis.com/ajax/libs/jqueryui/1.8.6/jquery-ui.min.js"></script> <script type="text/javascript" src="js/jquery.dataTables.min.js"></script> <script type="text/javascript" src="js/TableTools/TableTools.js"></script> <script type="text/javascript" src="ZeroClipboard/ZeroClipboard.js"></script> <script type="text/javascript"> $(document).ready(function() { TableToolsInit.sSwfPath = "ZeroClipboard.swf"; oTable = $('#sortable').dataTable({ "bRetrieve": true, "bProcessing": true, "sScrollX": "100%", "sScrollXInner": "110%", "bScrollCollapse": true, "bJQueryUI": true, "sPaginationType": "full_numbers", "sDom": 'T<"clear"><"fg-toolbar ui-widget-header ui-corner-tl ui-corner-tr ui-helper-clearfix"lfr>t<"fg-toolbar ui-widget-header ui-corner-bl ui-corner-br ui-helper-clearfix"ip>' }); }); </script> </head> <body bgcolor="#e0e0e0"> <div class="main"> <div class="body"> <div class="body_resize"> <div class="liquid-round"> <div class="top"><span><h2>Details</h2></span></div> <div class="center-content"> <div style="overflow-x:hidden; min-height:400px; max-height:600px; overflow-y:auto;"> <div class="demo_jui"><br /> <table cellpadding="0" cellspacing="0" border="0" class="display" width="100%" id="sortable"> <thead> <tr> <th>First Name</th> <th>MI</th> <th>Last Name</th> <th>Street Address</th> <th>City</th> <th>State</th> <th>Zip</th> <th>DOB</th> <th>Gender</th> <th>Spouse Name</th> <th>Spouse Date of Birth</th>  <th>Dependent Child Name 1</th> <th>Dependent Date of Birth 1</th> <th>Dependent Child Name 2</th> <th>Dependent Date of Birth 2</th> <th>Dependent Child Name 3</th> <th>Dependent Date of Birth 3</th> <th>Dependent Child Name 4</th> <th>Dependent Date of Birth 4</th> <th>Dependent Child Name 5</th> <th>Dependent Date of Birth 5</th> <th>Dependent Child Name 6</th> <th>Dependent Date of Birth 6</th> <th>Dependent Child Name 7</th> <th>Dependent Date of Birth 7</th> </tr> </thead> <tbody> <tr> ... UPDATE REGARDING COMMENTS/ANSWERS I have received a number of responses indicating the number of headers may not match the field count in the body. As I mention below, eliminating the php script below altogether would eliminate 5+ fields in the header and without question throw the count match off balance. This DOES NOT however cause an error and in fact "resolves" the issue in that datatables functions properly (even though there is NO header record for 5+ fields in the body.

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Asp.net Custom user control button. How to stop multiple clicks by user.

- by Laurence Burke

I am trying to modify an open source Forum called YetAnotherForum.net in the project they have a custom user control called Yaf:ThemeButton. Now its rendered as an anchor with an onclick method in this code ThemeButton.cs using System; using System.Web.UI; using System.Web.UI.WebControls; namespace YAF.Controls { /// <summary> /// The theme button. /// </summary> public class ThemeButton : BaseControl, IPostBackEventHandler { /// <summary> /// The _click event. /// </summary> protected static object _clickEvent = new object(); /// <summary> /// The _command event. /// </summary> protected static object _commandEvent = new object(); /// <summary> /// The _attribute collection. /// </summary> protected AttributeCollection _attributeCollection; /// <summary> /// The _localized label. /// </summary> protected LocalizedLabel _localizedLabel = new LocalizedLabel(); /// <summary> /// The _theme image. /// </summary> protected ThemeImage _themeImage = new ThemeImage(); /// <summary> /// Initializes a new instance of the <see cref="ThemeButton"/> class. /// </summary> public ThemeButton() : base() { Load += new EventHandler(ThemeButton_Load); this._attributeCollection = new AttributeCollection(ViewState); } /// <summary> /// ThemePage for the optional button image /// </summary> public string ImageThemePage { get { return this._themeImage.ThemePage; } set { this._themeImage.ThemePage = value; } } /// <summary> /// ThemeTag for the optional button image /// </summary> public string ImageThemeTag { get { return this._themeImage.ThemeTag; } set { this._themeImage.ThemeTag = value; } } /// <summary> /// Localized Page for the optional button text /// </summary> public string TextLocalizedPage { get { return this._localizedLabel.LocalizedPage; } set { this._localizedLabel.LocalizedPage = value; } } /// <summary> /// Localized Tag for the optional button text /// </summary> public string TextLocalizedTag { get { return this._localizedLabel.LocalizedTag; } set { this._localizedLabel.LocalizedTag = value; } } /// <summary> /// Defaults to "yafcssbutton" /// </summary> public string CssClass { get { return (ViewState["CssClass"] != null) ? ViewState["CssClass"] as string : "yafcssbutton"; } set { ViewState["CssClass"] = value; } } /// <summary> /// Setting the link property will make this control non-postback. /// </summary> public string NavigateUrl { get { return (ViewState["NavigateUrl"] != null) ? ViewState["NavigateUrl"] as string : string.Empty; } set { ViewState["NavigateUrl"] = value; } } /// <summary> /// Localized Page for the optional link description (title) /// </summary> public string TitleLocalizedPage { get { return (ViewState["TitleLocalizedPage"] != null) ? ViewState["TitleLocalizedPage"] as string : "BUTTON"; } set { ViewState["TitleLocalizedPage"] = value; } } /// <summary> /// Localized Tag for the optional link description (title) /// </summary> public string TitleLocalizedTag { get { return (ViewState["TitleLocalizedTag"] != null) ? ViewState["TitleLocalizedTag"] as string : string.Empty; } set { ViewState["TitleLocalizedTag"] = value; } } /// <summary> /// Non-localized Title for optional link description /// </summary> public string TitleNonLocalized { get { return (ViewState["TitleNonLocalized"] != null) ? ViewState["TitleNonLocalized"] as string : string.Empty; } set { ViewState["TitleNonLocalized"] = value; } } /// <summary> /// Gets Attributes. /// </summary> public AttributeCollection Attributes { get { return this._attributeCollection; } } /// <summary> /// Gets or sets CommandName. /// </summary> public string CommandName { get { if (ViewState["commandName"] != null) { return ViewState["commandName"].ToString(); } return null; } set { ViewState["commandName"] = value; } } /// <summary> /// Gets or sets CommandArgument. /// </summary> public string CommandArgument { get { if (ViewState["commandArgument"] != null) { return ViewState["commandArgument"].ToString(); } return null; } set { ViewState["commandArgument"] = value; } } #region IPostBackEventHandler Members /// <summary> /// The i post back event handler. raise post back event. /// </summary> /// <param name="eventArgument"> /// The event argument. /// </param> void IPostBackEventHandler.RaisePostBackEvent(string eventArgument) { OnCommand(new CommandEventArgs(CommandName, CommandArgument)); OnClick(EventArgs.Empty); } #endregion /// <summary> /// Setup the controls before render /// </summary> /// <param name="sender"> /// </param> /// <param name="e"> /// </param> private void ThemeButton_Load(object sender, EventArgs e) { if (!String.IsNullOrEmpty(this._themeImage.ThemeTag)) { // add the theme image... Controls.Add(this._themeImage); } // render the text if available if (!String.IsNullOrEmpty(this._localizedLabel.LocalizedTag)) { Controls.Add(this._localizedLabel); } } /// <summary> /// The render. /// </summary> /// <param name="output"> /// The output. /// </param> protected override void Render(HtmlTextWriter output) { // get the title... string title = GetLocalizedTitle(); output.BeginRender(); output.WriteBeginTag("a"); output.WriteAttribute("id", ClientID); if (!String.IsNullOrEmpty(CssClass)) { output.WriteAttribute("class", CssClass); } if (!String.IsNullOrEmpty(title)) { output.WriteAttribute("title", title); } else if (!String.IsNullOrEmpty(TitleNonLocalized)) { output.WriteAttribute("title", TitleNonLocalized); } if (!String.IsNullOrEmpty(NavigateUrl)) { output.WriteAttribute("href", NavigateUrl.Replace("&", "&")); } else { // string.Format("javascript:__doPostBack('{0}','{1}')",this.ClientID,"")); output.WriteAttribute("href", Page.ClientScript.GetPostBackClientHyperlink(this, string.Empty)); } bool wroteOnClick = false; // handle additional attributes (if any) if (this._attributeCollection.Count > 0) { // add attributes... foreach (string key in this._attributeCollection.Keys) { // get the attribute and write it... if (key.ToLower() == "onclick") { // special handling... add to it... output.WriteAttribute(key, string.Format("{0};{1}", this._attributeCollection[key], "this.blur();this.display='none';")); wroteOnClick = true; } else if (key.ToLower().StartsWith("on") || key.ToLower() == "rel" || key.ToLower() == "target") { // only write javascript attributes -- and a few other attributes... output.WriteAttribute(key, this._attributeCollection[key]); } } } // IE fix if (!wroteOnClick) { output.WriteAttribute("onclick", "this.blur();this.style.display='none';"); } output.Write(HtmlTextWriter.TagRightChar); output.WriteBeginTag("span"); output.Write(HtmlTextWriter.TagRightChar); // render the optional controls (if any) base.Render(output); output.WriteEndTag("span"); output.WriteEndTag("a"); output.EndRender(); } /// <summary> /// The get localized title. /// </summary> /// <returns> /// The get localized title. /// </returns> protected string GetLocalizedTitle() { if (Site != null && Site.DesignMode == true && !String.IsNullOrEmpty(TitleLocalizedTag)) { return String.Format("[TITLE:{0}]", TitleLocalizedTag); } else if (!String.IsNullOrEmpty(TitleLocalizedPage) && !String.IsNullOrEmpty(TitleLocalizedTag)) { return PageContext.Localization.GetText(TitleLocalizedPage, TitleLocalizedTag); } else if (!String.IsNullOrEmpty(TitleLocalizedTag)) { return PageContext.Localization.GetText(TitleLocalizedTag); } return null; } /// <summary> /// The on click. /// </summary> /// <param name="e"> /// The e. /// </param> protected virtual void OnClick(EventArgs e) { var handler = (EventHandler) Events[_clickEvent]; if (handler != null) { handler(this, e); } } /// <summary> /// The on command. /// </summary> /// <param name="e"> /// The e. /// </param> protected virtual void OnCommand(CommandEventArgs e) { var handler = (CommandEventHandler) Events[_commandEvent]; if (handler != null) { handler(this, e); } RaiseBubbleEvent(this, e); } /// <summary> /// The click. /// </summary> public event EventHandler Click { add { Events.AddHandler(_clickEvent, value); } remove { Events.RemoveHandler(_clickEvent, value); } } /// <summary> /// The command. /// </summary> public event CommandEventHandler Command { add { Events.AddHandler(_commandEvent, value); } remove { Events.RemoveHandler(_commandEvent, value); } } } } now that is just cs file its handled like this in the .ascx page of the actual website <YAF:ThemeButton ID="Save" runat="server" CssClass="yafcssbigbutton leftItem" TextLocalizedTag="SAVE" OnClick="Save_Click" /> now it is given an OnClick codebehind function that does some serverside function like this protected void Save_Click(object sender, EventArgs e) { //some serverside code here } now I have a problem with the user being able to click multiple times and firing that serverside function multiple times. I have added in the code as of right now an extra onclick="this.style.display='none'" in the .cs code but that is a ugly fix I was wondering if anyone would have a better idea of disabling the ThemeButton clientside?? pls any feedback if I need to give more examples or further explain the question thanks.

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jQuery Clone and add row to last row

- by user198880

I want to add a row whenever the user click on the new button.I want to clone the row "tRow0" and add it to the last row of the table "tblEquipment tbody".I wrote a JavaScript function for adding the row(AddEquipment).The problem is that the row is not getting added in the last row. clone row : tRow0 last row : tRow1 Actually the new row must added after the "tRow1" row.But the new row get added below "trActivity1_2" row.Please provide me the solution. my javascript function: function AddEquipment() { var row = jQuery('#tRow0').clone(true).show().insertAfter('#tblEquipment tbody>tr:last'); var index = document.getElementById("hdnMaxEqpId").value; jQuery("#tblEquipment tbody>tr:last").attr("id", "tRow" + index) jQuery("td:eq(0) input", row).attr("id", "chkEqp" + index); jQuery("td:eq(1) div:eq(0)", row).attr("id", "divEqpName" + index); jQuery("td:eq(1) input:eq(0)", row).attr("id", "hdnWODefEqpId" + index).attr("name", "hdnWODefEqpId" + index); jQuery("td:eq(1) input:eq(1)", row).attr("id", "hdnEquipmentId" + index).attr("name", "hdnEquipmentId" + index).attr("onpropertychange",""); jQuery("td:eq(1) input:eq(2)", row).attr("id", "txtEquipment" + index).attr("name", "txtEquipment" + index); jQuery("td:eq(1) img", row).attr("id", "imgshowEquipmentTree" + index).attr("onclick", ""); jQuery("td:eq(1) div:eq(1)", row).attr("id", "divEqpImage" + index); jQuery("td:eq(2) div", row).attr("id", "divEqpHierarchy" + index); jQuery("td:eq(3) textarea", row).attr("id", "txtEqRemarks" + index); jQuery("td:eq(4) img", row).attr("id", "imgEqAttachment" + index); } my aspx page: <table id="tblEquipment"> <thead> <tr> <th> </th> <th> Equipment</th> <th> Hierarchy</th> <th> Remarks</th> <th> Attachment</th> <th> Total Cost</th> </tr> </thead> <tbody id="tbEquipment"> <tr id="tRow0" class="trChildItem"> <td> <input id="chkEqp0" name="chkEqp0" type="checkbox" /> </td> <td> <div id="divEqpName0"> <input id="hdnWODefEqpId0" name="hdnWODefEqpId0" type="hidden" value="0" /> <input id="hdnEquipmentId0" name="hdnEquipmentId0" onpropertychange="AutoSaveEquipment(0);" type="hidden" value="0" /> <input id="txtEquipment0" class="clsSpText" name="txtEquipment0" readonly /> </div> <div id="divEqpImage0"> </div> </td> <td> <div id="divEqpHierarchy0">  </div> </td> <td> <textarea id="txtEqRemarks0" class="clsSpTextArea" cols="20" name="txtEqRemarks0" rows="1"></textarea> </td> <td> </td> </tr> <tr id="tActMaster0" class="trInnerChildItem"> <td> </td> <td colspan="5"> <div id="divActivitiesdetails0"> </div> </td> </tr> <tr id="tRow1" class="trChildItem"> <td> <input id="chkEqp1" runat="server" type="checkbox" /> <div id="divEqpEdit1"> </div> </td> <td> <div id="divEqpName1"> <input id="hdnWODefEqpId1" runat="server" type="hidden" value="7" /> <input id="hdnEquipmentId1" runat="server" type="hidden" value="4" /> <div id="divEqp1"> e2</div> <div id="divEqpImage1"> <a id="activiy1" onclick="HideActivities(1)"> </div> </td> <td> <div id="divEqpHierarchy1"> Equipment-->e2</div> </td> <td> <div id="divEqpRemarks1"> Remarks</div> </td> <td> <div> </div> </td> <td> <div> $0.00</div> </td> </tr> <tr id="tActMaster1" class="trInnerChildItem" jquery1275984958765="3"> <td> </td> <td colspan="5"> <div id="divActivitiesdetails1"> <div id="divActivityMaster"> <table> <thead> <tr> <th> <a onclick="ActivityPopUp(0,1)"> </a></th> <th> Activity</th> <th> Description</th> <th> Duration</th> </tr> </thead> <tbody id="tbActivity"> <tr id="trActivity1_1" class="trChildItem" ondblclick="ActivityPopUp(3,1)" onmouseleave="HideActEditDiv('1_1')" onmouseover="ShowActEditDiv('1_1',7,1)"> <td> <div id="divActEdit1_1"> </div> </td> <td> <input id="hdnDefActivityId1_1" runat="server" type="hidden" value="33333" /> <div id="divActivityName1_1"> Act1</div> </td> <td> <div id="divActivityDesc1_1"> Ac1</div> </td> <td> <div id="divActivityDuration1_1"> 1 Day</div> </td> </tr> <tr id="trActivity1_2" class="trChildItem" ondblclick="ActivityPopUp(3,1)" onmouseleave="HideActEditDiv('1_2')" onmouseover="ShowActEditDiv('1_2',7,1)"> <td> <div id="divActEdit1_2"> </div> </td> <td> <input id="hdnDefActivityId1_2" runat="server" type="hidden" value="4" /> <div id="divActivityName1_2"> Act2</div> </td> <td> <div id="divActivityDesc1_2"> Act2Desc</div> </td> <td> <div id="divActivityDuration1_2"> 1 Day</div> </td> </tr> </tbody> </table> </div> </div> </td> </tr> </tbody> </table>

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jquery jumps to top on click event, return false or prevenDefault doesn't work

- by Sebsemillia

Hi, I have written a simple jquery script for a content slider. My problem is that the screen always jumps to the top position of the parent div when sliding the content. I've tried return false and preventDefault to cope with this effect, but the two just make the script not work anymore, nothing happens when I click the links.. So here is the jquery code: $(document).ready(function (){ var itemCount = $('.container div').size(); var itemWidth = $('.container div').width(); $('.container').wrap('<div id="AboutSlider"></div>'); $('#AboutSlider').css({'width':'640px', 'overflow':'hidden', 'position':'relative', 'height':'400px'}); $('#AboutSlider .container').css({'width':itemCount*itemWidth+'px', 'position':'absolute', 'height':'400px'}); $('.container .aboutContent').css({'padding-left':'0px'}); $('#AboutSlider .aboutContent').css({'width':'640px', 'float':'left', 'min-height':'400px'}); $('#AboutNav a').click(function(){ var integer = $(this).attr('rel'); $('#AboutSlider .container').animate({left:-640*(parseInt(integer)-1)}) $('#AboutNav a').each(function(){ $(this).removeClass('active'); if($(this).hasClass('button'+integer)){ $(this).addClass('active')} }); }); }); And here the respective html bit: <div id="Dienstleistungen"> <div class="left_column"> <h2>Meine Dienstleistungen</h2> <h3>KOMPETENZEN</h3> <ul id="AboutNav"> <li><h1><a href="#Kompetenzen" class="button1 active" rel="1" title="Frontend Entwicklung | Sebastian Böhme">Überblick</a></h1></li> <li><h1><a href="#Frontend" class="button2" rel="2" title="Frontend Entwicklung | Sebastian Böhme">Frontend Entwicklung</a></h1></li> <li><h1><a href="#CMS" class="button3" rel="3" title="Content Management Systeme & Online Shops | Sebastian Böhme">Content Management Systeme & Online Shops</a></h1></li> <li><h1><a href="#SEO" class="button4" rel="4" title="Suchmaschinenoptimierung (SEO) | Sebastian Böhme">Suchmaschinenoptimierung (SEO)</a></h1></li> <li><h1><a href="#ScreenDesign" class="button5" rel="5" title="Screen Design | Sebastian Böhme">Screen Design</a></h1></li> <li><h1><a href="#Hand" class="button6" rel="6" title="Alles aus einer Hand | Sebastian Böhme">Alles aus einer Hand</a></h1></li> </ul> </div> <div class="container"> <div id="Kompetenzen" class="aboutContent right_columns"> <h1>Überblick</h1> <p>Phasellus in massa. Curabitur dolor eros, gravida et, hendrerit ac, cursus non, massa. Aliquam lorem. In hac habitasse platea dictumst. Cras eu mauris. Quisque lacus. Donec ipsum. Nullam vitae sem at nunc pharetra ultricies. Vivamus elit eros, ullamcorper a, adipiscing sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> <p>Teng sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> </div> <hr /> <div id="Frontend" class="aboutContent right_column "> <h1>Frontend Entwicklung</h1> <p>Phasellus in massa. Curabitur dolor eros, gravida et, hendrerit ac, cursus non, massa. Aliquam lorem. In hac habitasse platea dictumst. Cras eu mauris. Quisque lacus. Donec ipsum. Nullam vitae sem at nunc pharetra ultricies. Vivamus elit eros, ullamcorper a, adipiscing sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> <p>Teng sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> </div> <hr /> <div id="CMS" class="aboutContent right_column "> <h1>Content Management Systeme & Online Shops</h1> <p>Phasellus in massa. Curabitur dolor eros, gravida et, hendrerit ac, cursus non, massa. Aliquam lorem. In hac habitasse platea dictumst. Cras eu mauris. Quisque lacus. Donec ipsum. Nullam vitae sem at nunc pharetra ultricies. Vivamus elit eros, ullamcorper a, adipiscing sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> <p>Teng sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> </div> <hr /> <div id="SEO" class="aboutContent right_column "> <h1>Suchmaschinenoptimierung (SEO)</h1> <p>Phasellus in massa. Curabitur dolor eros, gravida et, hendrerit ac, cursus non, massa. Aliquam lorem. In hac habitasse platea dictumst. Cras eu mauris. Quisque lacus. Donec ipsum. Nullam vitae sem at nunc pharetra ultricies. Vivamus elit eros, ullamcorper a, adipiscing sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> <p>Teng sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> </div> <hr /> <div id="ScreenDesign" class="aboutContent right_column "> <h1>Screen Design</h1> <p>Phasellus in massa. Curabitur dolor eros, gravida et, hendrerit ac, cursus non, massa. Aliquam lorem. In hac habitasse platea dictumst. Cras eu mauris. Quisque lacus. Donec ipsum. Nullam vitae sem at nunc pharetra ultricies. Vivamus elit eros, ullamcorper a, adipiscing sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> <p>Teng sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> </div> <hr /> <div id="Hand" class="aboutContent right_column"> <h1>Alles aus einer Hand</h1> <p>Curabitur dolor eros, gravida et, hendrerit ac, cursus non, massa. Aliquam lorem. In hac habitasse platea dictumst. Cras eu mauris. Quisque lacus. Donec ipsum. Nullam vitae sem at nunc pharetra ultricies. Vivamus elit eros, ullamcorper a, adipiscing sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> <p>Teng sit amet, porttitor ut, nibh. Maecenas adipiscing mollis massa. Nunc ut dui eget nulla venenatis aliquet. Sed luctus posuere justo. Cras vehicula varius turpis. Vivamus eros metus, tristique sit amet, molestie dignissim, malesuada et, urna. </p> </div> </div> </div> somebody got any idea? Thanks a lot in advance!!

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Application crashing on getting updated information from database using timer and storing it on loca

- by Amit Battan

In our multi - user application we are continuously interacting with database. We have a common class through which we are sending POST queries to database and obtaining xml files in return. We are using delegates of NSXMLParser to parse the obtained file. The problem with us is we are facing many crashes in it generally when application is idle and changed data in database is being fetched in background through timer which is invoked after every few seconds. We have also dealt with error handling through try and catch but it proves to be of no use in this case and mostly application crashes with following error : Exception Type: EXC_BAD_ACCESS (SIGBUS) Exception Codes: KERN_PROTECTION_FAILURE at 0x0000000000000020 Strange thing is that many times the fetching of updated data at background works very fine, same methods being successfully executed under similar conditions but suddenly it crashes on one of them. The codes we are using is as follows: // we are using timer in this way: chkOnlineUser=[NSTimer scheduledTimerWithTimeInterval:15 target:mmObject selector:@selector(threadOnlineUser) userInfo:NULL repeats:YES]; // this method being called in timer -(void)threadOnlineUser{//HeartBeat in Thread [NSThread detachNewThreadSelector:@selector(onlineUserRefresh) toTarget:self withObject:nil]; } // this performs actual updation -(void)onlineUserRefresh{ NSAutoreleasePool *pool =[[NSAutoreleasePool alloc]init]; @try{ if(chkTimer==1){ return; } chkTimer=1; if([allUserArray count]==0){ [user parseXMLFileUser:@"all" andFlag:3]; [allUserArray removeAllObjects]; [allUserArray addObjectsFromArray:[user users]]; } [objHeartBeat parseXMLFile:[loginID intValue] timeOut:10]; NSMutableDictionary *tDictOL=[[NSMutableDictionary alloc] init]; tDictOL=[objHeartBeat onLineList]; NSArray *tArray=[[NSArray alloc] init]; tArray=[[tDictOL objectForKey:@"onlineuser"] componentsSeparatedByString:@","]; [loginUserArray removeAllObjects]; for(int l=0;l less than [tArray count] ;l++){ int t;//=[[tArray objectAtIndex:l] intValue]; if([[allUserArray valueForKey:@"Id"] containsObject:[tArray objectAtIndex:l]]){ t = [[allUserArray valueForKey:@"Id"] indexOfObject:[tArray objectAtIndex:l]]; [loginUserArray addObject:[allUserArray objectAtIndex:t]]; } } [onlineTable reloadData]; [logInUserPopUp removeAllItems]; if([loginUserArray count]==1){ [labelLoginUser setStringValue:@"Only you are online"]; [logInUserPopUp setEnabled:YES]; }else{ [labelLoginUser setStringValue:[NSString stringWithFormat:@" %d users online",[loginUserArray count]]]; [logInUserPopUp setEnabled:YES]; } NSMenu *menu = [[NSMenu alloc] initWithTitle:@"menu"]; NSMenuItem *itemOne = [[NSMenuItem alloc] initWithTitle:@"" action:NULL keyEquivalent:@""]; [menu addItem:itemOne]; for(int l=0;l less than [loginUserArray count];l++){ NSString *tempStr= [NSString stringWithFormat:@"%@ %@",[[[loginUserArray objectAtIndex:l] objectForKey:@"user_fname"] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]],[[[loginUserArray objectAtIndex:l] objectForKey:@"user_lname"] stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]]; if(![tempStr isEqualToString:@""]){ NSMenuItem *itemOne = [[NSMenuItem alloc] initWithTitle:tempStr action:NULL keyEquivalent:@""]; [menu addItem:itemOne]; }else if(l==0){ NSMenuItem *itemOne = [[NSMenuItem alloc] initWithTitle:tempStr action:NULL keyEquivalent:@""]; [menu addItem:itemOne]; } } [logInUserPopUp setMenu:menu]; if([lastUpdateTime isEqualToString:@""]){ }else { [self fetchUpdatedInfo:lastUpdateTime]; [self fetchUpdatedGroup:lastUpdateTime];// function same as fetchUpdatedInfo [avObject fetchUpdatedInfo:lastUpdateTime];// function same as fetchUpdatedInfo [esTVObject fetchUpdatedInfo:lastUpdateTime];// function same as fetchUpdatedInfo } lastUpdateTime=[[tDictOL objectForKey:@"lastServerTime"] copy]; } @catch (NSException * e) { [queryByPost insertException:@"MainModule" inFun:@"onlineUserRefresh" excp:[e description] userId:[loginID intValue]]; NSRunAlertPanel(@"Error Panel", @"Main Module- onlineUserRefresh....%@", @"OK", nil, nil,e); } @finally { NSLog(@"Internal Update Before Bye"); chkTimer=0; NSLog(@"Internal Update Bye");// Some time application crashes after this log // Some time application crahses after "Internal Update Bye" log } } // The method which we are using to obtain updated data is of following form: -(void)fetchUpdatedInfo:(NSString *)UpdTime{ @try { if(initAfterLoginComplete==0){ return; } [user parseXMLFileUser:UpdTime andFlag:[loginID intValue]]; [tempUserUpdatedArray removeAllObjects]; [tempUserUpdatedArray addObjectsFromArray:[user users]]; if([tempUserUpdatedArray count]0){ if([contactsView isHidden]){ [topContactImg setImage:[NSImage imageNamed:@"btn_contacts_off_red.png"]]; }else { [topContactImg setImage:[NSImage imageNamed:@"btn_contacts_red.png"]]; } }else { return; } int chkprof=0; for(int l=0;l less than [tempUserUpdatedArray count];l++){ NSArray *tempArr1 = [allUserArray valueForKey:@"Id"]; int s; if([[[tempUserUpdatedArray objectAtIndex:l] objectForKey:@"Id"] intValue]==profile_Id){ chkprof=1; } if([tempArr1 containsObject:[[tempUserUpdatedArray objectAtIndex:l] objectForKey:@"Id"]]){ s = [tempArr1 indexOfObject:[[tempUserUpdatedArray objectAtIndex:l] objectForKey:@"Id"]]; [allUserArray replaceObjectAtIndex:s withObject:[tempUserUpdatedArray objectAtIndex:l]]; }else { [allUserArray addObject:[tempUserUpdatedArray objectAtIndex:l]]; } NSArray *tempArr2 = [tempUser valueForKey:@"Id"]; if([tempArr2 containsObject:[[tempUserUpdatedArray objectAtIndex:l] objectForKey:@"Id"]]){ s = [tempArr2 indexOfObject:[[tempUserUpdatedArray objectAtIndex:l] objectForKey:@"Id"]]; [tempUser replaceObjectAtIndex:s withObject:[tempUserUpdatedArray objectAtIndex:l]]; }else { [tempUser addObject:[tempUserUpdatedArray objectAtIndex:l]]; } } NSSortDescriptor *sortDescriptor = [[NSSortDescriptor alloc] initWithKey:@"user_fname" ascending:YES]; [tempUser sortUsingDescriptors:[NSMutableArray arrayWithObject:sortDescriptor]]; [userListTableView reloadData]; [groupsArray removeAllObjects]; for(int z=0;z less than [tempGroups count];z++){ NSMutableArray *tempMArr=[[NSMutableArray alloc] init]; for(int l=0;l less than [allUserArray count];l++){ if([[[allUserArray objectAtIndex:l] objectForKey:@"GroupId"] intValue]==[[[tempGroups objectAtIndex:z] objectForKey:@"group_id"] intValue]){ [tempMArr addObject:[allUserArray objectAtIndex:l]]; } } [groupsArray insertObject:tempMArr atIndex:z]; [tempMArr release]; tempMArr= nil; } for(int n=0;n less than [tempGroups count];n++){ [[groupsArray objectAtIndex:n] addObject:[tempGroups objectAtIndex:n]]; } [groupsListOV reloadData]; if(chkprof==1){ [self profileShow:profile_Id]; }else { } [self selectUserInTable:0]; }@catch (NSException * e) { NSRunAlertPanel(@"Error Panel", @"%@", @"OK", nil, nil,e); } } // The method which we are using to frame select query and parse obtained data is: -(void)parseXMLForUser:(int)UId stringVar:(NSString*)stringVar{ @try{ if(queryByPost) [queryByPost release]; queryByPost=[QueryByPost new]; // common class used to invoke method to send request via POST method //obtaining data for xml parsing NSString *query=[NSString stringWithFormat:@"Select * from userinfo update_time = '%@' AND NOT owner_id ='%d' ",stringVar,UId]; NSData *obtainedData=[queryByPost executeQuery:query WithAction:@"query"]; // method invoked to perform post query if(obtainedData==nil){ // data not obtained so return return; } // initializing dictionary to be obtained after parsing if(obtainedDictionary) [obtainedDictionary release]; obtainedDictionary=[NSMutableDictionary new]; // xml parsing if (updatedDataParser) // airportsListParser is an NSXMLParser instance variable [updatedDataParser release]; updatedDataParser = [[NSXMLParser alloc] initWithData:obtainedData]; [updatedDataParser setDelegate:self]; [updatedDataParser setShouldResolveExternalEntities:YES]; BOOL success = [updatedDataParser parse]; } @catch (NSException *e) { NSLog(@"wtihin parseXMLForUser- parseXMLForUser:stringVar: - %@",[e description]); } } //The method which will attempt to interact 4 times with server if interaction with it is found to be unsuccessful , is of following form: -(NSData*)executeQuery:(NSString*)query WithAction:(NSString*)doAction{ NSLog(@"within ExecuteQuery:WithAction: Query is: %@ and Action is: %@",query,doAction); NSString *returnResult; @try { NSString *returnResult; NSMutableURLRequest *postRequest; NSError *error; NSData *searchData; NSHTTPURLResponse *response; postRequest=[self directMySQLQuery:query WithAction:doAction]; // this method sends actual POST request NSLog(@"after directMYSQL in QueryByPost- performQuery... ErrorLogMsg"); searchData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error]; returnResult = [[NSString alloc] initWithData:searchData encoding:NSASCIIStringEncoding]; NSString *resultToBeCompared=[returnResult stringByTrimmingCharactersInSet:[NSCharacterSet whitespaceAndNewlineCharacterSet]]; NSLog(@"result obtained - %@/ resultToBeCompared - %@",returnResult,resultToBeCompared); if(![resultToBeCompared isEqualToString:@""]){ }else { sleep(10); postRequest=[self directMySQLQuery:query WithAction:doAction]; searchData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error]; if(![resultToBeCompared isEqualToString:@""]){ }else { sleep(10); postRequest=[self directMySQLQuery:query WithAction:doAction]; searchData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error]; if(![resultToBeCompared isEqualToString:@""]){ }else { sleep(10); postRequest=[self directMySQLQuery:query WithAction:doAction]; searchData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error]; if(![resultToBeCompared isEqualToString:@""]){ }else { sleep(10); postRequest=[self directMySQLQuery:query WithAction:doAction]; searchData = [NSURLConnection sendSynchronousRequest:postRequest returningResponse:&response error:&error]; if(![resultToBeCompared isEqualToString:@""]){ }else { return nil; } } } } } returnResult = [[NSString alloc] initWithData:searchData encoding:NSASCIIStringEncoding]; return searchData; } @catch (NSException * e) { NSLog(@"within QueryByPost , execurteQuery:WithAction - %@",[e description]); return nil; } } // The method which sends POST request to server , is of following form: -(NSMutableURLRequest *)directMySQLQuery:(NSString*)query WithAction:(NSString*)doAction{ @try{ NSLog(@"Query is: %@ and Action is: %@",query,doAction); // some pre initialization NSString *stringBoundary,*contentType; NSURL *cgiUrl ; NSMutableURLRequest *postRequest; NSMutableData *postBody; NSString *ans=@"434"; cgiUrl = [NSURL URLWithString:@"http://keysoftwareservices.com/API.php"]; postRequest = [NSMutableURLRequest requestWithURL:cgiUrl]; [postRequest setHTTPMethod:@"POST"]; stringBoundary = [NSString stringWithString:@"0000ABCQueryxxxxxx"]; contentType = [NSString stringWithFormat:@"multipart/form-data; boundary=%@", stringBoundary]; [postRequest addValue:contentType forHTTPHeaderField: @"Content-Type"]; //setting up the body: postBody = [NSMutableData data]; [postBody appendData:[[NSString stringWithFormat:@"\r\n\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"code\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:ans] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"action\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:doAction] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"devmode\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:[[[NSBundle mainBundle] infoDictionary] objectForKey:@"devmode"]] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:@"Content-Disposition: form-data; name=\"q\"\r\n\r\n"] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithString:query] dataUsingEncoding:NSUTF8StringEncoding]]; [postBody appendData:[[NSString stringWithFormat:@"\r\n--%@--\r\n",stringBoundary] dataUsingEncoding:NSUTF8StringEncoding]]; [postRequest setHTTPBody:postBody]; NSLog(@"Direct My SQL ok");// Some time application crashes afte this log //Some time application crashes after "Direct My SQL ok" log return [postRequest mutableCopy]; }@catch (NSException * e) { NSLog(@"NSException %@",e); NSRunAlertPanel(@"Error Panel", @"Within QueryByPost- directMySQLQuery...%@", @"OK", nil, nil,e); return nil; } }

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