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howardwood
3 Sep 2011, 9:05 AM
Greetings,

I am learning to use ExtJS the hard way - debugging a large ASP.NET application with no prior experience in ExtJS or even jQuery. I have overcome several hurdles, but find I need help with my current problem.

The code is breaking in a file associated with a master page - default.master.js and Visual Studio displays this message:

Microsoft JScript runtime error: Unable to get value of the property 'add_endRequest': object is null or undefined

The line of code is:
Sys.WebForms.PageRequestManager.getInstance().add_endRequest(EndRequestHandler);

I am having a hard time wrapping my head around what is going on. Can someone give me some ideas on what to look for?

Thanks

howardwood
7 Sep 2011, 2:56 PM
There are a lot of posts in this forum that never get a reply.

Uberdude
8 Sep 2011, 1:16 AM
That doesn't look like Ext code, more like some Microsoft ASP stuff. Is the error happening in the browser or server? For browser side debugging Firebug, an add-on for Firefox, or the similar Chrome development tools, are indispensable for developing Ext applications.