Telerik blogs

Tag: Telerik UI for ASP.NET AJAX

  • Web ASP.NET AJAX

    Don't store ASP.NET controls in Session, Application or Cache

    In some cases you may end up with the following exception when working with RadControls for ASP.NET Ajax: "Script controls may not be registered after PreRender." The explanation of this error is simple - some UI control implementing the IScriptControl interface (e.g. any control from the RadControls for ASP.NET Ajax suite) is stored in the Session, Application or Cache and then is added in some live controls collection. Here is an...
    by Atanas Korchev
    September 19, 2008
  • Web

    Internet Explorer JavaScript Performance Tip - use the "children" property

    Today I was profiling the initialization time of RadTreeView for ASP.NET Ajax and found out that the biggest bottleneck was traversing the DOM tree. The code looks something like this: //get_childListElement() returns an HTML element  var childNodes = parent.get_childListElement().childNodes;  for (var i = 0, length = childNodes.length; i < length; i++)  {       var childNode = childNodes[i];         //Perform additional initialization  }  I tested with 10000 elements and in IE7 I got about 25000ms whilst in FireFox the total time was around 33ms (Core 2 Duo @ 2.33GHz). Quite a difference if you ask me. I thought that there may be some IE specific method/property which could perform better and I dug into MSDN. And a few minutes later I found the children property!!! Apparently the children collection contains only HTML elements (whilst childNodes is full of...
    by Iana Tsolova
    August 14, 2008
  • Release

    Yet another update of RadControls for ASP.NET Ajax DynamicData support

    ASP.NET Dynamic Data has just gone official with the SP1 release of Visual Studio 2008 and .NET 3.5. We have just released updated version of our Dynamic Data bits which is tested against the official release and has few minor improvements (such as implementation of the DataControl property). Get it from here....
    by Iana Tsolova
    August 13, 2008
  • Web ASP.NET AJAX

    Web Resources demystified: Part 3 (Troubleshooting)

    In this post I will show you how to troubleshoot Web Resource related problems and how to deal with them. If you are using an ASP.NET server control with rich client-side behavior it is likely built to utilize web resources. Sometimes your page loads and that rich server side control does not work at all - the tree view does not expand, the grid cannot sort etc. Most of the times this is because the JavaScript files of those controls have failed to load. If your browser is configured to prompt on JavaScript errors you may see the following error messages: "RadTreeView...
    by Atanas Korchev
    July 18, 2008
  • Web ASP.NET AJAX

    How To Override Styles in a RadControl for ASP.NET AJAX' Embedded Skin

    In the era of the "classic" RadControls for ASP.NET modifying a skin required opening ~ / RadControls / [ControlName] / Skins / [SkinName] / styles.css and making the necessary changes. The new RadControls for ASP.NET AJAX (formerly known as "Prometheus") by default use skins, which are embedded in the assembly. This simplifies deployment but sacrifices customization. Or does it? Actually, making a change to an embedded skin of a RadControl for ASP.NET AJAX is quite easy, given that one keeps in mind a couple of notable things. Namely: (1) Since the embedded skin cannot be modified, the custom styles need to be placed elsewhere. For example ...
    by Iana Tsolova
    June 17, 2008
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