Comments on: Updated your web.config, but Sys is still undefined?

By: zeeshan

zeeshan — Tue, 01 Mar 2011 09:27:55 +0000

Thankss buddy…

Quick fix works well for me.. :)

By: Riccardo

Riccardo — Wed, 15 Dec 2010 12:50:10 +0000

Thanks a lot.

By: jat

jat — Thu, 05 Aug 2010 15:42:54 +0000

Dear Dave I am using following code, and aslo created js file with same name (Init.js). But it does not work for me. Do I need to do some thing else.....because I could not understand the line... "then call our wireups in a Sys.Application.init event handler ". What it means.... ? thanks

By: asp.net ajax 1.0 中出现 ‘Sys’ is undefined 错误 | Nothing but coding

asp.net ajax 1.0 中出现 ‘Sys’ is undefined 错误 | Nothing but coding — Sat, 31 Jul 2010 15:42:17 +0000

[...] is undefined错误。具体可以参考： http://encosia.com/2007/08/16/updated-your-webconfig-but-sys-is-still-undefined/ ASP.netajax, ASP.net WCF and 404.3 Errors → Leave a comment0 [...]

By: ASP.NET disable a button control during postback « Basketman's Blog

ASP.NET disable a button control during postback « Basketman's Blog — Mon, 07 Jun 2010 08:52:31 +0000

[...] http://encosia.com/2007/08/16/updated-your-webconfig-but-sys-is-still-undefined/ Possibly related posts: (automatically generated)ASP.NET Postback Control Lost When Button is Disabled via JavaScriptDeveloping ASP.NET Custom ControlsASP.Net – simple hiding of a button once clicked [...]

By: vaishali

vaishali — Thu, 04 Mar 2010 04:38:28 +0000

Thanks, the error is resolved.

By: Silvia Terzi

Silvia Terzi — Tue, 16 Feb 2010 15:40:28 +0000

Help, I have the same problem and I also use Telerik. Have you solved the problem? How did you solved it?

By: Sunny Chevli

Sunny Chevli — Mon, 21 Dec 2009 10:21:55 +0000

I am looking for same solution. I am getting ‘sys is not defined’ error

any solution?

By: bibhu

bibhu — Fri, 23 Oct 2009 06:30:13 +0000

Thanks a ton

By: gemini twin

gemini twin — Tue, 06 Oct 2009 10:32:42 +0000

try using an ajax enabled website instead
it worked for me

By: Kushal

Kushal — Mon, 05 Oct 2009 07:04:12 +0000

Keep up the great work!!
thanks a lot

By: Dave Ward

Dave Ward — Wed, 16 Sep 2009 19:09:07 +0000

Check your web.config for . It is automatically added during the 1.x upgrade process and breaks ASP.NET AJAX: http://weblogs.asp.net/scottgu/archive/2006/12/10/gotcha-don-t-use-xhtmlconformance-mode-legacy-with-asp-net-ajax.aspx

By: Josh Korn

Josh Korn — Wed, 16 Sep 2009 19:06:51 +0000

This problem turns out to have its roots in a legacy page (where legacy means “first built with .NET 1.1″). When the markup and code are copied into a freshly built ASP.NET Ajax web form, the right thing happens.

It’s not clear to me exactly what the problem is, although one possible culprit is that new pages have while old pages have just a element.

Cheers
Josh

By: Josh Korn

Josh Korn — Mon, 14 Sep 2009 17:47:11 +0000

Hmmm … I followed this to a T, but still get the same problem — Sys.WebForms is undefined. Sys.Application is fine, but not Sys.WebForms.

What else could be wrong?

Thx
Josh

By: Shamshad Khan

Shamshad Khan — Thu, 23 Jul 2009 09:47:16 +0000

Thanks a lot for your help