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• When is JavaScript's eval() not evil?

  - by Richard Turner

  I'm writing some JavaScript to parse user-entered functions (for spreadsheet-like functionality). Having parsed the formula I could convert it into JavaScript and run eval() on it to yield the result. However, I've always shied away from using eval() if I can avoid it because it's evil (and, rightly or wrongly, I've always thought it is even more evil in JavaScript because the code to be evaluated might be changed by the user). Obviously one has to use eval() to parse JSON (I presume that JS libraries use eval() for this somewhere, even if they run the JSON through a regex check first), but when else, other than when manipulating JSON, it is OK to use eval()?

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• Arguments for moving from LINQtoSQL to Nhibernate?

  - by sah302

  Backstory: Hi all, I just spent a lot of time reading many of the LINQ vs Nhibernate threads here and on other sites. I work in a small development team of 4 people and we don't even have really any super experienced developers. We work for a small company that has a lot of technical needs but not enough developers to implement them (and hiring more is out of the question right now). Typically our projects (which individually are fairly small) have been coded separately and weren't really layered in anyway, code wasn't re-used, no class libraries, and we just use the LINQtoSQL .dbml files for our pojects, we really don't even use objects but pass around values and stuff, the only time we use objects is when inserting to a database (heck not even querying since you don't need to assign it to a type and can just bind to gridview). Despite all this as I said our company has a lot of technical needs, no one could come to us for a year and we would have plenty of work to implement requested features. Well I have decided to change that a bit first by creating class libraries and actually adding layers to our applications. I am trying to meet these guys halfway by still using LINQtoSQL as the ORM yet and still use VB as the language. However I am finding it a b***h of a time dealing with so many thing in LINQtoSQL that I found easy in Nhibernate (automatic handling of the session, criteria creation easier than expression trees, generic an dynamic querying easier etc.) So... Question: How can I convince my lead developers and other senior programmers that switching to Nhibernate is a good thing? That being in control of our domain objects is a good thing? That being able to implement interfaces is a good? I've tried exlpaining the advantages of this before but it's not understood by them because they've never programmed in a true OO & layered way. Also one of the counter arguments to this I can see is sqlMetal generates those classes automatically and therefore it saves a lot of time. I can't really counter that other than saying spending more time on infrastructure to make it more scalable and flexible is good, but they can't see how. Again, I know the features and advantages (somewhat enough I believe) of each, but I need arguments applicable to my context, hence why I provided the context. I just am not a very good arguer I guess. (Caveat: For all the LINQtoSQL lovers, I may just not be super proficient as LINQ, but I find it very cumbersome that you are required to download some extra library for dynamic queries which don't by default support guid comparisons, and I also find the way of updating entitites to be cumbersome as well in terms of data context managing, so it could just be that I suck hehe.)

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• Web-Frameworks for Education Management Systems?

  - by Indebi

  So, I'm working on an idea and I'll go into a brief overview of that but my question is, What are some good web frameworks for this situation? I have some experience in the following languages: C# Python I have considerably more experience in C# than Python, however I am expecting to learn new things. My idea is this, a completely web-based community-oriented Education Management System that focuses on making students and teachers day-to-day lives easier. For students it will provide a centralized place for them to do homework, study for tests, and reinforce concepts learned previously in class. For teachers it will give them a centralized place to handle assignments, attendance, homework, tests, and all other major parts of classroom management. All of that, but in a community-oriented fashion. Everything a teacher does is shared and open to constructive criticism, allowing other teachers to use their assignments/tests and for students or other teachers to comment, rate and criticize their assignments. This encourages an environment of openness that will allow teacher's to focus on teaching and student's to focus on learning. And that community wouldn't be limited to one school or school-district, this system would be completely school-independent. Please note that I have no problem with hearing constructive criticism on this idea, however I would prefer if this post was more focused on my question. I have somewhat explored about the following options: Django ASP.NET Ruby on Rails Silverlight (1) I have Django installed and I played with it for a little bit, I really like how easy setting up databases are and how it handles the database completely for you. I don't really know how to use it very well and I don't quite understand the Model-View-Controller paradigm(?) for it yet but I haven't thought about it much. I also like the fact that it uses Python. (2) I don't really like Visual Studio for developing in ASP.NET, I hate the way the web-designer works and it just feels clunky and old. I like the server-side development part though. I don't like how expensive ASP.NET and overall Visual Studio is, even if I do get it for free for now using DreamSpark (3) I haven't been able to explore much with this, I could not get Rails (or maybe Ruby) properly installed. I first installed it within RadRails and that didn't work so I uninstalled RadRails and then installed the latest version of Ruby off the official Windows Installer and then installed Ruby on Rails through gem and even after all that it still didn't work, so I installed Netbeans and attempted to use it there but it still did not work (4) I like Silverlight in some extents, I've played with this one the most, it's very similar to WPF (which I've used the most) in a lot of ways but I don't like how database connectivity works, at least in comparison to Django. I also dislike how expensive everything with Microsoft is, even if I get it for free for now with DreamSpark. I would like to hear some suggestions from experienced web-developers as to what I should use and why, or at least what some good options are for my scenario Your help would be very appreciated

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• .NET: Avoidance of custom exceptions by utilising existing types, but which?

  - by Mr. Disappointment

  Consider the following code (ASP.NET/C#): private void Application_Start(object sender, EventArgs e) { if (!SetupHelper.SetUp()) { throw new ShitHitFanException(); } } I've never been too hesitant to simply roll my own exception type, basically because I have found (bad practice, or not) that mostly a reasonable descriptive type name gives us enough as developers to go by in order to know what happened and why something might have happened. Sometimes the existing .NET exception types even accommodate these needs - regardless of the message. In this particular scenario, for demonstration purposes only, the application should die a horrible, disgraceful death should SetUp not complete properly (as dictated by its return value), but I can't find an already existing exception type in .NET which would seem to suffice; though, I'm sure one will be there and I simply don't know about it. Brad Abrams posted this article that lists some of the available exception types. I say some because the article is from 2005, and, although I try to keep up to date, it's a more than plausible assumption that more have been added to future framework versions that I am still unaware of. Of course, Visual Studio gives you a nicely formatted, scrollable list of exceptions via Intellisense - but even on analysing those, I find none which would seem to suffice for this situation... ApplicationException: ...when a non-fatal application error occurs The name seems reasonable, but the error is very definitely fatal - the app is dead. ExecutionEngineException: ...when there is an internal error in the execution engine of the CLR Again, sounds reasonable, superficially; but this has a very definite purpose and to help me out here certainly isn't it. HttpApplicationException: ...when there is an error processing an HTTP request Well, we're running an ASP.NET application! But we're also just pulling at straws here. InvalidOperationException: ...when a call is invalid for the current state of an instance This isn't right but I'm adding it to the list of 'possible should you put a gun to my head, yes'. OperationCanceledException: ...upon cancellation of an operation the thread was executing Maybe I wouldn't feel so bad using this one, but I'd still be hijacking the damn thing with little right. You might even ask why on earth I would want to raise an exception here but the idea is to find out that if I were to do so then do you know of an appropriate exception for such a scenario? And basically, to what extent can we piggy-back on .NET while keeping in line with rationality?

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• Sub-process /usr/bin/dpkg returned an error code (1)

  - by Delirium tremens

  I'm trying to find a parental control for Ubuntu that turns adult site words into *. I have tried webcontentcontrol (doesn't even ask me to set a password), mobicip (doesn't even get listed in package names). My family can see my adult bookmark names and that's really embarrassing. I tried sudo apt-get remove webcontentcontrol sudo apt-get -f install sudo apt-get upgrade sudo pkill webcontentcontrol sudo apt-get remove webcontentcontrol but still can't uninstall it. Googling for that error message resulted in a solution that is first said dangerous, later said wrong. After sudo apt-get remove webcontentcontrol, I always get the error message "Sub-process /usr/bin/dpkg returned an error code (1)". What should I do? The full error message is in brazilian portuguese. Should I post it anyway? I have just installed nanny, but while webcontentcontrol is installed, it doesn't load.

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• Windows secure pinned website tile

  - by Stijn de Voogd

  I'm currently working on a pinned website tile for my website and instead of using a static XML file i'm linking the tile to a web api that returns user specific XML. My question is: Is it possible to secure this tile so that a user needs to be logged in before the data loads? The pinned website livetile doesn't send any security request headers/ cookies: - Http: Request, GET /v1/livetile/firsttile Command: GET + URI: /v1/livetile/firsttile ProtocolVersion: HTTP/1.1 UserAgent: Microsoft-WNS/6.3 Host: 192.168.14.109:2089 Cache-Control: no-cache HeaderEnd: CRLF Sidenote: Notice how it's not even sending an accept header even though it only wants xml. Info: http://msdn.microsoft.com/en-US/library/ie/dn455106 http://msdn.microsoft.com/en-us/library/ie/hh761491.aspx# Thanks in advance!

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• Wordpress FORCE UPDATE of permalink settings

  - by Scott B

  I've been having issues on creating new wordpress blogs where I'm setting permalinks via script on theme activation. However, even though they appear to be correct when I check the permalink settings in WP, my new pages are throwing 404 errors. The only fix I've found is that I have to go back to permalink options and click "Save Changes", even though, according to the display, I've made no changes to need to save... I'm setting permalinks to /%postname%/ Here's how I'm doing it. if(get_option('permalink_structure')==""){update_option('permalink_structure', '/%postname%/');} That script gets run when my theme is activated. Any ideas why it only partially does the job?

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• Cannot manage to have the main form to show scrollbars if bigger

  - by Philippe Watel

  Hi everyone I have developped an app on 22inch monitor at its max resolution when I run this on a laptop with a different ratio and a smaller resolution well the form is too big - to be expected but no scroll bar appear automaticaly to see the whole thing if needed I have tempered with all options but could not figure it out I have tried autoscroll of course but nothing I am sure it is not so difficult but I am stuck So if anyone could indicate me what properties to change I'll be most greatful or even better some easy strategy or components (even paying) to achieve a better screen resolution independance but the scrollbar would be great to start with Thanks & Regards Philippe Watel

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• iPhone Simulator Error: dyld: Symbol not found: _objc_collect_if_needed

  - by freespace

  I have been seeing the following error message a lot whenever I run something in the simulator: dyld: Symbol not found: _objc_collect_if_needed Referenced from: /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.sdk/System/Library/Frameworks/Foundation.framework/Foundation Expected in: /usr/lib/libobjc.A.dylib in /Developer/Platforms/iPhoneSimulator.platform/Developer/SDKs/iPhoneSimulator3.1.sdk/System/Library/Frameworks/Foundation.framework/Foundation I am running XCode 3.2.2 on OS X 10.6.3, and have reinstalled the SDK twice with no avail. This error makes running any code on the simulator something of a Russian Roulette, but with 5 out of 6 chambers loaded. I have checked the files mentioned in the error message, and they all checkout as being present. This sometimes go away if I restart XCode. Other times I have to logout, or even restart. And sometimes nothing works. I have googled this, even tried apple's developer forums. Other than a reference to this in the MonoTouch list, this bug appears to be completely unknown otherwise. Anything help would be greatly appreciated - this is a real PITA. Cheers, Steve

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• Restoring a "Canceled" event with Google Calendar API?

  - by user283182

  I'm trying to change the status of an event back from "canceled" to "confirmed" using Google Calendar API (I'm using .NET but an answer in any language would help) but I get GDataRequestException error: "You can't modify a cancelled event" If I've used the API to delete an event in a repeating series, for example, is it possible to change the status of the resulting recurrence exception (there's no EXDATE, just a new "canceled" event that is only visible when the feed is requested with start and end date) to "confirmed" (or even delete the resulting exception completely) in order to restore the repeating series to the original state? event.Delete() and event.Update() don't even see the event any longer once it's been .canceled. event.Update() gives the above error. Thanks!

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• Get source and destination of outbound traffic in pfSense

  - by maxsilver

  I'm looking at the traffic graph in pfSense (Version 1.2.2), which we're using as a router / NAT / ect on our network. Recently, I'm seeing a sudden, constant spike of 15 - 30kbps traffic outbound, that is unusual for our network (normally its below 2kbps, we're mostly all inbound traffic) Is there any way to determine what the source of this traffic is, or where it's going? (Just an internal IP address for source, and external IP address for destination would be all I need) I've already tried switching the traffic graph to 'LAN' and watching the host list on the right side, but it seems ... flakey. The numbers it shows seem to fade in and out at random, and the values never add up to anywhere near the graph values. I'm not allowed to post the image, but a photo is available at - http://imgur.com/QYjKI.png

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• Proper way to format date from database using javascript/jquery

  - by Darcy

  Hi all, I am calling my database which contains a datetime datatype. The date looks like this: 2005-05-23 16:06:00.000 I would like to display this in a table when a user selects a certain item from a list. I call my controller action and return Json of all the times and put them in a table. The problem is the date is completely wrong. What is displayed is this: /Date(1255470180000)/ The date that is returned isn't even parsable (which I don't want to do anyway) so I can't even get the data if I wanted to. Any ideas?

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• EPIC no line number

  - by cc96ai

  I installed EPIC, but I cannot see the line number even I enable line number, any idea

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• Click Once doesn't create StartMenu entry and Shortcut on Windows 7 x64

  - by MadBoy

  I've application that I deploy to share with ClickOnce so other users can install it and use it on their own machines. It worked fine till i noticed that when i install this app on my own machine (Windows 7 x 64) it doesn't add StartMenu (even thou it installs correctly and I have it in Control Panel / Programs). I didn't had that problem when my development machine was Windows XP. Application also deploys fine on other Windows XP computers. Also during installation (when i rerun setup) even thou I already have Net Framework 3.5 it always wants to install one (it starts that and terminates few seconds later - probably installer sees that it's already there). I can run application straigit from share just a bit of pain to do it. Are there some special settings I should do? Or some patches? I have Visual Studio 2008 and system with all optional updates installed. Application is written in C# and uses NET 3.5.

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• English dictionary as txt or xml file with support of synonyms

  - by Simon

  Can someone point me to where I can download English dictionary as a txt or xml file. I am building a simple app for myself and looking for something what I could start using immediately without learning complex API. Support for synonyms would be great, that is it should be easier to retrieve all the synonyms for particular word. It would be absolutely fantastic if dictionary would be listing British and American spelling of the words where they are differ. Even if it would be small dictionary (few 000's words) that's ok, I only need it for small project. I even would be willing to buy one if the price is reasonable, and dictionary is easy to use - simple xml wold be great. Any directions please.

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• How can I select this element?

  - by Kyle Sevenoaks

  Hi, I have code blindness, it's like snowblindness, just wth far too much code. I have a div class dynamically generated, <div class="even last"> How can I select that with CSS? div.even last { background-color:#ffffff; height:100%; border-top:1px solid #F5F5F5; padding:2px; margin-top:35px; } Doesn't seem to work, and I just can't think more.. Thanks :)

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• How to make scrolling through images as fast as Apple's Photos app

  - by clozach

  The Goal — On an iPhone, to browse through several hundred locally-stored jpgs using a UIScrollView. The Problem — Like many others before me, I've tried implementing a scroll view based on Apple's Page Control sample code and found it lacking. The biggest issue I'm currently up against is that the sample code's architecture doesn't seem to scale. With just a few images loaded from disk, everything's fine. Once the number of images gets into the dozens, though, scrolling suffers terribly: the scrollview stutters mid-scroll with each new swipe. The only code I've toyed with that comes even close to being reasonably responsive is Three20, but even there the performance doesn't hold a candle to Photos. For now, I'm just using Three20, but a faster, custom solution would definitely be preferable.

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• Spawn phone call from EC2 alerts

  - by Matt

  I have a system setup on AWS/EC2, it currently is using their CloudWatch alert system. The problem is this sends just to email, when ideally I would like this to be making a phone call and/or sending text messages to certain phone numbers when an alert fires (Note that I do not need the phone call to actually say anything, just call the person). We are trying to solve the problem that Amazon alerts are only useful if people are checking their email, which isnt always the case because all server problems love to happen at 4am on saturday... Please respond with any possible solutions/ideas, ideally I do not want to implement an entire monitoring system (IE: Nagios) on top of everything to handle this.

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• ViewStateMode property in Asp.Net 4.0

  - by AspOnMyNet

  I haven’t yet started learning Asp.Net 4.0, but I did read a bit on ViewState, where there is a new property ViewStateMode. In earlier versions of Asp.Net, if parent control had its ViewState disabled, then child controls also had their ViewState disabled, even if their EnableViewState was set to true. a) Thus if I understand it correctly, then a child control C having ViewStateMode property set to “Enable” causes C to save its view state, even if parent control has its view state disabled? b) Is there a reason why ViewStateMode property hasn’t/couldn’t be implemented in earlier versions of Asp.Net? thanx

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• Fine-tuning a LNMP stack

  - by Norman

  I'm in the process of setting up a server with 4GB RAM and 2 CPUs. The stack will be CentOS + NGINX + MySQL + PHP (with APC) and spawn-fcgi. It will be used to serve 10 Wordpress blogs, 3 of which receive about 20,000 hits per day. Each Wordpress instance is equipped with the W3 TotalCache. I have a few variables to play with: NGINX (How many worker_processes, worker_connections, etc) PHP (What parameters in php.ini should I change? What about apc?) Spawn-fcgi (Right now I have 6 php-cgi spawned. How many of them should I have?) I realize it's hard to tell without testing, but if you could please provide me with some ballpark numbers, that would be helpful too.

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• How to check that image sizes are ok or not

  - by Goran

  I am having many image files in one folder. Mostly there are jpg, but some png, bmp, gif, tif also (but jpg is most important if others are not possible). There are also many xml files in same folder with same names as image files are having. So there is something like this: 1.jpg, 1.xml, a.png, a.xml, 3g.bmp, 3g.xml... All xml files are having only 1 line: <IMGRES WIDTH="1234" HEIGHT="567" /> (of course numbers are not same). I am looking for some easy way to check all image sizes and confirm if they are same as in xml or not. So I want output like: imagename, xmlwidth x xmlheight, realwidth x realheight, match/error Is this possible in only Windows with no other software installed?

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• Two-page view in Word, shouldn't the first page be on the right?

  - by Cylindric

  Greetings Superusers, I'm putting together a lengthy document in Word, and it's going to be printed and bound duplex. I've put page-numbers "outside" etc, and all is pretty. The problem is, in the "Two Pages" view, it puts p1 on the left, then p2 on the right, then p3 below on the left, and p4 on the right. p1 p2 p3 p4 p5 p6 Shouldn't this be slightly different though? When I get to print it, p1 is on the right, not the left, so the preview should go p1 p2 p3 p4 p5 p6 Because when I "open" the book, it's pages 2 and 3 that are side-by-side. This makes layout tweaking confusing, because it's not instantly obvious which pages will be "visible" to the reader at the same time together. Have I missed something? I can't just put a blank page first, because that would bugger up the printing, as the printer automatically duplexes and binds etc. (Office 2008, by the way)

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• How to keep material on one double page in latex ?

  - by drasto

  I have two side document(so I use twoside option) in latex. I need to keep some material(text, pictures...) on one double page. In another words I want to allow page break from odd to even page but I want to prohibit breaks from even to odd page. I tried to write macro: \newcommand{\nl}{ \\ \ifodd\c@page \relax \else \nopagebreak \fi} and use it instead of \ (I don't use any other line breaks commands in my document) but it does not work. Thanks for all answers.

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• WSS_Content contains?

  - by Mike

  WSS 3.0:Windows2003 I have a content database that keeps growing for the name of simply, "WSS_Content" This database is aside from all the other content databases that are linked to an web application, but located in the same directory. I count 5 CONTENT databases on this directory, but only 4 web applications (excluding the centraladmin). Trouble is it keeps growing in size and I need to know what it is and why its growing. Is this a default database of some kind? Where and why would it grow? I recently found, through Central Administration, that one of my sites has a content database name of "WSS_Content_(random numbers and letters)" whereas, the other content databases would have a name like "WSS_Content_(WebApplicationName)" What gives?

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• Marshal a C++ class to C#

  - by Adam Haile

  I need to access code in a native C++ DLL in some C# code but am having issues figuring out the marshaling. I've done this before with code that was straight C, but seem to have found that it's not directly possible with C++ classes. Made even more complicated by the fact that many of the classes contain virtual or inline functions. I even tried passing the headers through the PInvoke Interop Assistant, but it would choke on just about everything and not really no what to do... I'm guessing because it's not really supported. So how, if at all possible, can you use a native C++ class DLL from .NET code. If I have to use some intermediary (CLR C++?) that's fine.

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