Event propagation halted when synchrounous ajax call happens within an event

[drew.waddell]

This is an odd issue. I have done lots of debugging to try to figure out what is actually occurring but I have not figured it out.

This is an issue in Firefox, Internet Explorer handles the events perfectly. I have not tried any other browser.

I am not sure if this is an issue somewhere in the synchronous code, or if there is a Firefox setting I am unaware of such as a event timeout, or a Firefox bug.

jsFiddle: ​http://jsfiddle.net/dwaddell/dAj7B/
Screen Capture video: ​http://dl.dropbox.com/u/5126043/ScreenCapture_11-7-2012%201.38.52%20PM.wmv

Steps to reproduce:

1. Bring up Firebug
2. Click in the first textarea, an async request is fired, no issue ever happens
3. Click in the second textarea, a sync request is fired, notice if the sync ajax request takes ~70ish ms to respond the next click out of the textarea will not trigger, else there is no issue

I added the link to the video because I understand the issue is rather odd and it may be confusion follow the steps to reproduce, I am hoping that with both it will be easy to reproduce.

Thanks for looking, Drew

[dmethvin]

Don't count out the possibility that Firebug is affecting the browser. Try disabling all plugins and see if the behavior changes. From the description it seems like this may be a Firefox issue that they would have to fix. Can you create a test case with plain XHR and addEventListener to rule out jQuery code?

[drew.waddell]

jsFiddle: ​http://jsfiddle.net/dwaddell/xSBxW/14/

I've removed the jQuery part for the second textarea, I seem to still be getting the issue. I didn't remove all the jQuery though, should I do that or do you think that is overkill?

Thanks, Drew

[drew.waddell]

Also, I tried with plugins disabled, no Firebug running. It was still an issue.

[dmethvin]

Sorry but this is much too complex at the moment to be called a bug with jQuery core. You'll need to reduce this to something simpler. It might also be useful to try making a jQuery-free example to see if it really is a Firefox bug.

[cmcnulty]

For the record, I hit this bug, and can confirm that it is a Firefox bug:

​http://jsfiddle.net/cmcnulty/h9RDT/

The bug's been reported at least once that I can find - current status is unconfirmed:

​https://bugzilla.mozilla.org/show_bug.cgi?id=636171

[anonymous]

I filed a bug report for this at Mozilla as well: ​https://bugzilla.mozilla.org/show_bug.cgi?id=810691

[dmethvin]

I can't think of a workaround, so I'll change the resolution accordingly. Thanks for the bugzilla reference cmcnulty!