"Sys" is undefined

Question

User771506077 posted

I have migrated my application to .Net Framework 4.5. I am not using any update panel and not even script manager.

One of the page which is throwing this error has the below code:

<bod><form>

<script>

       Sys.Application.add_load(SectionMethod)

</script>

This was working fine before migration.

I used fiddler and found that ScriptResources.axd?,,,,,,,, file is not able to locate at server. But its working fine in my machine and at other server.

Answer 1

User2103319870 posted

Hi,

Try to move the script block below the ScriptManager control.

Please refer the below link

• http://encosia.com/updated-your-webconfig-but-sys-is-still-undefined/

Answer 2

User771506077 posted

There is no scriptmanager control in application

Answer 3

User555306248 posted

Hi,

There are lots of scenarios bing on the 'sys' error.

You can check these thread:

http://forums.asp.net/p/1209962/2132128.aspx#2132128  Generally speaking, the sys problem should be resolved by using this appraoch.

http://encosia.com/updated-your-webconfig-but-sys-is-still-undefined/

http://weblogs.asp.net/chrisri/archive/2007/02/02/demystifying-sys-is-undefined.aspx

http://forums.asp.net/t/1040236.aspx/1

If not, you can check this sys problem FAQ thread:

Getting error while running Ajax application. Error:'Sys' is undefined.

Answer 4

User771506077 posted

Thanks a lot for all replies.

In my case:

1. I migrated my application to VS2012 and .Net 4.5. VS2012 migration wizard removed this settings under HttpHandlers tag and Http modules from web.config.

2. I am using Integrated Managed Pipeline mode settings.

3. My application dont have any update panel and script manager.

Solution:

1. From fiddler; i found that application is not able to found the scriptResource.axd file

2. From IIS, Handler Mappings option. i have added ScriptResource.axd.

after adding the mappings; the application start behaving properly.

Thanks a lot to everyone for guidance.