ASP.NET fails to detect IE10 causing _doPostBack is undefined JavaScript error

Question

ASP.NET fails to detect IE10 causing the following error:

_doPostBack is undefined JavaScript error

or maintain FF5 scrollbar position.

There is a bug in the browser definition files that shipped with .NET 2.0 and .NET 4, namely that they contain definitions for a certain range of browser versions. But the versions for some browsers (like IE 10) aren't within those ranges any more. Therefore, ASP.NET sees them as unknown browsers and defaults to a down-level definition, which has certain inconveniences, like that it does not support features like JavaScript.

The fix available at http://support.microsoft.com/kb/2600100 for Win7 SP1, is not working for me. Please help me on this. My working environment is:

.NET Framework 3.5 SP1, Windows Server 2003

Answer 1

Try installing the Browser Definition Files from NuGet http://nuget.org/packages/App_BrowsersUpdate into your project. Browser Definition files for ASP.NET 4 are compatible with ASP.NET 3.5, so you should be okay. You may have had an issue installing the hotfix you mentioned if you do not have the appropriate permissions on your machine.

Answer 2

if you continue to have this issue, there is a small code snippet you can add to your global.asax that will resolve the problem as a temporary workaround until you have your server(s) patched.

http://ronniediaz.com/2013/02/07/ie10-imagebutton-_dopostback-undefined-bug-with-update-panel-script-manager/

Answer 3

The KB 2600100 hotfix were replaced by Microsoft .NET Framework 4 Reliability Update 2 (KB2600217) http://support.microsoft.com/kb/2600217 - the documentation states that this update resolves 7 issues including two that you mentioned. But it seems that you need to use Microsoft .NET framework 4 instead of 3.5. If the KB 2600100 hotfix is not working, you might want to check IIS Server Manager to find out what .NET framework version is being used for running your web site.