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• Creating a data driven web front end quickly

  - by Ilya

  Over the last few years, I can't count how many web front ends I've had to create over a relatively simple database schema to fasciliate data entry. I have to imagine that someone out there has written a framework I can use to simplify the creation of these kind of simple GUIs. Doing a quick google, the following look like the key players in .net: ASP.Net dynamic data framework SubSonic NakedObjects for .net Has anyone worked with any of these and have any preferences? More importantly, are there other frameworks that would be good to evaluate in this space?

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• Cache inferno - how can Model.A be two different things at the same time?

  - by Martin

  I have this <%=Model.StartDate%> <%=Html.Hidden("StartDate", Model.StartDate)%> it outputs: 2010-05-11 11:00:00 +01:00 <input type="hidden" value="2010-03-17 11:00:00 +01:00" name="StartDate" id="StartDate"> What the... It's a paging mechanism so the hidden value was valid on the first page and I've been able to move forward to the next page. But since the values won't update properly it ends there. What do I need to do. Using firefox.

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• Show javascript execution progress

  - by Midhat

  I have some javascript functions that take about 1 to 3 seconds. (some loops or mooML templating code.) During this time, the browser is just frozen. I tried showing a "loading" animation (gif image) before starting the operation and hiding it afterwords. but it just doesnt work. The browser freezes before it could render the image and hides it immediately when the function ends. Is there anything I can do to tell the browser to update the screen before going into javascript execution., Something like Application.DoEvents or background worker threads. So any comments/suggestions about how to show javascript execution progress. My primary target browser is IE6, but should also work on all latest browsers

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• Attribute lost with yield

  - by Nelson

  Here's an interesting one... There is some code that I'm trying to convert from IList to IEnumerable: [Something(123)] public IEnumerable<Foo> GetAllFoos() { SetupSomething(); DataReader dr = RunSomething(); while (dr.Read()) { yield return Factory.Create(dr); } } The problem is, SetupSomething() comes from the base class and uses: Attribute.GetCustomAttribute(new StackTrace().GetFrame(1).GetMethod(), typeof(Something)) Yield ends up creating MoveNext(), MoveNext() calls SetupSomething(), and MoveNext() does not have the [Something(123)] attribute. I can't change the base class, so it appears I am forced to stay with IList or implement IEnumerable manually (and add the attribute to MoveNext()). Is there any other way to make yield work in this scenario?

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• To what point is making an HTML page valid worth it?

  - by Martín Fixman

  Since a long time ago, when I found out about the W3C Validator, I made sure every HTML document I made was valid HTML. However, I think sometimes it just isn't necessary to waste time making it valid. Of course, for actual Internet pages may be important, but is making pages on an Intranet, or even little front-ends that are used with other programs, when the HTML page renders correctly in the most used browsers (not necessarily counting IE 6 and 7). I think I'm mostly talking about little improvements over code, such as wrapping every shown element of the page on <p> or <div> tags.

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• iPhone: scroll view with arbitrary page/"settling" boundaries?

  - by Ben

  Hi all, I'm trying to figure out if I can get what I want out of UIScrollView through some trickery or whether I need to roll my own scroll view: I have a series of items in row that I want to scroll through. One item should always be centered in the view, but other items should be visible to either side. In other words, I want normal scrolling and edge bouncing, but I want the deceleration when the user ends a touch to naturally settle at some specified stop point. (Actually now that I think of it, this behavior is similar to coverflow in this respect.) I know UIScrollView doesn't do this out of the box, but does anyone have suggestions for how it might be made to do this, or if anyone's spotted any code that accomplishes something similar (I'm loathe to reimplement all the math for deceleration and edge bounce) Thanks!

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• How to show the elapsed time while a long SQL Query is executed?

  - by Salvador

  i need to show a popup window before the a query execution, show the time elapsed while the sql query is executed , and close that windows when the query ends. actually i do something like this var frm : tFrmPopupElapsed; // this form have a ttimer and a tlabel to show the elapsed time //but the tlabel is not updated, i tried using update; and refresh; but nothing happens //the timer is enabled. begin frm:=tform.create(nil); frm.Init;//this procedure set the timer to enabled:=true try frm.Show(); ExecuteMyVeryLongQuery(); finally frm.Close; end; end; wich is the best way using a ttimer? a Tthread ? thanks in advance.

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• flex/actionscript client entity state refresh on JPA update using Pimento EntityManager

  - by Chris

  My Flex application uses a client-side pimento EntityManager which fetches quite a few objects and associations. It does this by forcing eager fetching of particular association ends in the form of fetch plans. I would like to update the client whenever a change has been made to an entity existing in the EntityManager's cache. Is it possible to update the state of the changed entity ONLY, including updating which entities are associated, without resetting the state of these associated entities? I have setup an EntityListener with a JPA post-update method that notifies clients when a persisted entity has been updated. I want this to trigger a refresh for the modified client-side entity, but calling EntityManager.refresh(entity) resets all lazy associations to proxies. Initializing these proxies resets the associated entities, even if they were loaded previously. I'm looking for an efficient way to keep the client's state in synch with the server's state, at least with respect to the entities that have already been retrieved by the initial load.

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• Memory Management - Objective C NSString

  - by reising1

  I have an NSMutableDictionary called "output" and I am adding an NSString into it that is an integer. What is the proper way to do this? I can't figure it out. Everything I've tried ends up giving memory leaks. This is what I currently have: val is an int countryName is an NSString Here is how I declare "output": NSMutableDictionary *output = [[[NSMutableDictionary alloc] init] autorelease]; Here is the code that causes a memory leak: NSString *temp = [NSString stringWithFormat:@"%d",val]; [output setValue:temp forKey:countryName];

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• How to close an oracle db connection from php on an apache server? I mean close instantly.

  - by Valentin Jacquemin

  Usually closing a connection is simply done by oci_clone($connection); or in a worse case when the php script ends the connection pass away. In my case however, I face a different behavior. If I access my application which uses PHP 5.2.8, Apache 2.2.11 and oci8 1.2.5, the connection is kept during several minutes. Actually it seems to: if I launch netstat -b I see that the process httpd.exe remains with the ESTABLISHED status on the database's URL during a while (a few minutes). Could someone enlighten me on that behavior? P.S. I do not use persistent connections.

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• Linq-to-Sql not detecting change in xml

  - by porum

  I have an xml field (Answers) in Sql Server, but when changing the content via Linq-to-Sql, the record is not flagged for updating. e.g. in Linqpad... var profile = Profiles.FirstOrDefault(p => p.Answers != null); profile.Answers.SetAttributeValue("date", DateTime.Now.ToString()); GetChangeSet().Dump(); // nothing flagged profile.Answers = new XElement(profile.Answers); // ends up with correct xml GetChangeSet().Dump(); // record is flagged as changed Any suggestions apart from assigning a clone of itself to the field or storing the xml as a string to force the update?

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• Encoding issue with form and HTML Purifier / MySQL

  - by Andrew Heath

  Driving me nuts... Page with form is encoded as Unicode (UTF-8) via: <meta http-equiv="content-type" content="text/html; charset=utf-8"> entry column in database is text utf8_unicode_ci copying text from a Word document with " in it, like this: “1922.” is insta-fail and ends up in the database as â??1922.â?? (typing new data into the form, including " works fine... it's cut and pasting from Word...) PHP steps behind the scenes are: grab value from POST run through HTML Purifier default settings run through mysql_real_escape_string insert query into dbase Help?

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• Objective-C "if" statements not retaining

  - by seanny94

  I know the title of this question is a bit confusing, but here it goes anyway: I'm creating an NSString after an if statement but it just doesn't seem to want to retain outside of the statement. My conditional looks like this: if ([[password stringValue] isEqualToString:@""]) { NSString *pwd = [[NSString alloc]initWithString:@"password"]; } else { NSString *pwd = [[NSString alloc]initWithFormat:@"%@", [password stringValue]]; } ... and I call pwd later in the script like this: NSArray *arguments; arguments = [NSArray arrayWithObjects: ip, pwd, nil]; [task setArguments: arguments]; But when I do so in this way, the first snippet returns a warning of Unused variable 'pwd' and the latter call ends up in an error of 'pwd' undeclared. What am I doing wrong here? Thanks in advance. ;)

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• Update image in ASP.NET page from memory without refreshing the page.

  - by ZeeMan

  I have a command line C# server and an ASP.NET client, they both communicate via .NET Remoting. The server is sending the client still images grabbed from a webcam at say 2 frames a second. I can pass the images down to the client via a remote method call and the image ends up in this client method: public void Update(System.Drawing.Image currentFrame) { // I need to display the currentFrame on my page. } How do i display the image on the a page without saving the image to the hard disc? If it was a winForms app i could pass currentFrame to a picturebox ie. picturebox.Image = currentFrame. The above Update method gets fired at least 2 times a second. If the client was a winForms app i could simply put picturebox.Image = currentFrame and the current frame on the screen would automatically get updated. How do i achieve the same effect with ASP.NET? Will the whole page need to be reloaded etc?

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• How do you keep yourself and your co-workers from creating huge classes

  - by PieterG

  Stackoverflow users, How do you keep yourself from creating large classes with large bodied methods. When deadlines are tight, you end up trying to hack things together and it ends up being a mess which would need to be refactored. For me, the one way was to start with test driven development and that lends itself to good class design as well as the SRP (Single Responsibility Principle). I also see developers just double clicking on controls and typing out line after line in the event method that gets fired. What are your suggestions?

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• Issue with UITextView in an animation block

  - by collin

  I'm having an issue with a UITextView inside another UIView whose frame is manipulated in an animation block when the keyboard displays. During the animation block the UIView scales beautifully and as expected, but the UITextView jumps out of it's superview(the UIView being animated) at the start of the animation. By the end of the animation, the UITextView ends up in the right place... what gives? Can anybody explain why the UITextView is jumping out of it's container view at the start of the animation? Thanks in advance.

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• Regex pattern for searches with include and exclude

  - by alex-kravchenko-zmeyp

  I am working on a Regex pattern for searches that should allow optional '+' sign to include in the search and '-' sign to exclude from the search. For example: +apple orange -peach should search for apples and oranges and not for peaches. Also the pattern should allow for phrases in double quotes mixed with single words, for example: "red apple" -"black grape" +orange - you get the idea, same as most of the internet searches. So I am running 2 regular expressions, first to pick all the negatives, which is simple because '-' is required: (?<=[\-]"?)((?<=")(?<exclude>[^"]+)|(?<exclude>[^\s,\+\-"]+)) And second to pick positives, and it is a little more complex because '+' is optional: ((?<=[\+\s]")(?<include>[^\s"\+\-][^"]+))|(?<include>(?<![\-\w]"?)([\w][^,\s\-\+]+))(?<!") Positive search is where I am having a problem, it works fine when I run it in RegexBuddy but when I try in .Net the pattern picks up second word from negative criteria, for example in -"black grape" it picks up word 'grape' even though it ends with double quote. Any suggestions?

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• Can I close and reopen a socket?

  - by Roman

  I learned an example of usage of sockets. In this example a client sends a request to a server to open a socket and then the server (listening to a specific port) opens a socket and everything is fine, socket is "opened" from both sides (client and server). But it is still not clear to me how flexible is this stuff. For example, is it possible for the client to close an opened (from both ends) socket and to reopen it again (under condition that the server keeps the socket opened). Is it possible for the server to "know" that a socket was closed on the client side? Is it possible for the client to know that a socket was closed on the server side?

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• Efficient calculation of matrix cumulative standard deviation in r

  - by Abiel

  I recently posted this question on the r-help mailing list but got no answers, so I thought I would post it here as well and see if there were any suggestions. I am trying to calculate the cumulative standard deviation of a matrix. I want a function that accepts a matrix and returns a matrix of the same size where output cell (i,j) is set to the standard deviation of input column j between rows 1 and i. NAs should be ignored, unless cell (i,j) of the input matrix itself is NA, in which case cell (i,j) of the output matrix should also be NA. I could not find a built-in function, so I implemented the following code. Unfortunately, this uses a loop that ends up being somewhat slow for large matrices. Is there a faster built-in function or can someone suggest a better approach? cumsd <- function(mat) { retval <- mat*NA for (i in 2:nrow(mat)) retval[i,] <- sd(mat[1:i,], na.rm=T) retval[is.na(mat)] <- NA retval } Thanks.

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• Java: Line appears when using AffineTransform to scale image

  - by Malakim

  Hi, I'm having a problem with image scaling. When I use the following code to scale an image it ends up with a line either at the bottom or on the right side of the image. double scale = 1; if (scaleHeight >= scaleWidth) { scale = scaleWidth; } else { scale = scaleHeight; } AffineTransform af = new AffineTransform(); af.scale(scale, scale); AffineTransformOp operation = new AffineTransformOp(af, AffineTransformOp.TYPE_NEAREST_NEIGHBOR); BufferedImage bufferedThumb = operation.filter(img, null); The original image is here: http://tinyurl.com/yzv6r7h The scaled image: http://tinyurl.com/yk6e8ga Does anyone know why the line appears? Thanks!

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• AJAX with Ruby on Rails?

  - by Zachary

  This is probably a really dumb question with a simple answer but... I am working on a project where I need to use AJAX to send/receive information. I am using Ruby on Rails (which I am pretty new to), but rather than using the helper methods or the built in functionality in the 'defaults' Javascript file, I need to do this manually in my own Javascript. I believe that ultimately I will want to send a request with a JSON object, then have the controller return another JSON object containing the requested information. The problem is that I cannot seem to find the syntax for sending something to a specific controller method, with parameters, directly from Javascript - everything I Google ends up being tutorials for using the Rails AJAX helper methods.

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• How can I calculate data for a boxplot (quartiles, median) in a Rails app on Heroku? (Heroku uses Po

  - by hadees

  I'm trying to calculate the data needed to generate a box plot which means I need to figure out the 1st and 3rd Quartiles along with the median. I have found some solutions for doing it in Postgresql however they seem to depend on either PL/Python or PL/R which it seems like Heroku does not have either enabled for their postgresql databases. In fact I ran "select lanname from pg_language;" and only got back "internal". I also found some code to do it in pure ruby but that seems somewhat inefficient to me. I'm rather new to Box Plots, Postgresql, and Ruby on Rails so I'm open to suggestions on how I should handle this. There is a possibility to have a lot of data which is why I'm concerned with performance however if the solution ends up being too complex I may just do it in ruby and if my application gets big enough to warrant it get my own Postgresql I can host somewhere else. *note: since I was only able to post one link, cause I'm new, I decided to share a pastie with some relevant information

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• Variable height UIViews and labels

  - by Bob Spryn

  Ok so I'm not in a table cell at this point. (I've seen a lot of threads regarding the height of cells.) I have a detail view with a title and description at the top of the view, followed by a tableView below it. If the description is going to vary in length, how do I get the tableView to adjust with it accordingly so it always starts directly below it? I see apple doing this in the app store application. If you look at an application description (as if you were going to buy it), they have an application description, and wherever that ends a scrolling pane of screenshots follow. How do they do the varying height on the text description like that? Are they doing this all programmatically or can I use the layout controls in IB to do the same thing?

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• How to properly close a process with NppExec?

  - by Sam the Great

  I'm not sure what's going on here, but the following code continues running even after I end the process in the NppExec console with Ctrl-C (during the execution of the while loop). I restarted my computer to stop the Ctrl key sends. However, if I run the script in Window's cmd prompt, Ctrl-C ends the script just fine. import time import win32com.client shell = win32com.client.Dispatch("WScript.Shell") time.sleep(2) while True: shell.SendKeys('^') # Ctrl key time.sleep(0.5) The NppExec run command I used was: cmd /C python -u "$(FULL_CURRENT_PATH)" Let me know if there is any more information I can provide. Thanks.

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• How do we know if a query is cache or retrieved from database?

  - by Hadi

  For example: class Product has_many :sales_orders def total_items_deliverable self.sales_orders.each { |so| #sum the total } #give back the value end end class SalesOrder def self.deliverable # return array of sales_orders that are deliverable to customer end end SalesOrder.deliverable #give all sales_orders that are deliverable to customer pa = Product.find(1) pa.sales_orders.deliverable #give all sales_orders whose product_id is 1 and deliverable to customer pa.total_so_deliverable The very point that i'm going to ask is: how many times SalesOrder.deliverable is actually computed, from point 1, 3, and 4, They are computed 3 times that means 3 times access to database so having total_so_deliverable is promoting a fat model, but more database access. Alternatively (in view) i could iterate while displaying the content, so i ends up only accessing the database 2 times instead of 3 times. Any win win solution / best practice to this kind of problem ?

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