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window.onerror and Toolkit

Posted By:      Posted Date: October 03, 2010    Points: 0   Category :ASP.Net

I am implementing logging of client-side errors to ASP.NET Health Monitoring using a technique similar to this one:


This code adds a client-side handler to window.onerror, and posts via xmlHttp to an HttpHandler that logs the exception via Health Monitoring. To test, I have a page with a simple javascript error (<a href="http://forums.asp.net/AddPost.aspx?ForumID=1022#" onclick="throw 'test exception';">Throw error</a>)  AND a Ajax Control Toolkit Calendar extender with OnClientHide set to throw a test exception.

This works in both FireFox and IE for the most part, but there are a few issues I'm having trouble getting to the bottom of:

-In IE the message is "Exception Thrown and Not caught".  I would prefer to get the actual message.  In FF, the message is "uncaught exception: test exception", which is more useful IMO.  How can I
get the actual message in IE javascript?

-In FireFox, the "simple" example above works, but in the "Ajax Control Toolkit Calendar" example, the error is displayed in the FF error dialog, but not caught by window.onerror.  It acts as if there is something intercepting the error and not causing it to fire "onerror".  I've looked in the source and docs, but can't find where

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