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#5840 closed bug (worksforme)

Opened January 17, 2010 02:25PM UTC

Closed November 01, 2010 05:39AM UTC

Last modified April 26, 2011 12:02PM UTC

ajax callbacks lose exceptions

Reported by: borgar Owned by:
Priority: critical Milestone: 1.4.1
Component: ajax Version: 1.4
Keywords: Cc:
Blocked by: Blocking:

The following code should throw an error ("DOES_NOT_EXIST is not defined"), but doesn't in Firefox:

  success: function(html){

This is not a case of jQuery swallowing the error in a try/catch but rather that Firefox seems to loose the error somewhere in it's event handling.

While I think this is a browser bug, I think it needs addressing in jQuery because of the debugging implications: This may hide 1.4 compatibility errors in callbacks from developers upgrading.

Apart from try/catch within the callback itself, the only way I've been able to keep the exception is to defer it with a timeout:

function success() {
  // If a local callback was specified, fire it and pass it the data
  if ( s.success ) {
    try { callbackContext, data, status, xhr );
    } catch (e) {
        throw e;
  // ...
Attachments (0)
Change History (2)

Changed November 01, 2010 05:39AM UTC by snover comment:1

resolution: → worksforme
status: newclosed

test case works for me.

Changed April 26, 2011 12:02PM UTC by paul comment:2

I had the same problem; starting Firefox 4 in safe mode solved the problem. Turned out to be the Adblock Plus extension that was swallowing the errors in my case..