1223457 - Synchronous AJAX requests break event processing

Status: UNCONFIRMED

(Core :: DOM: Events, defect, P5)

Description

[Dom Black]

User Agent: Mozilla/5.0 (Macintosh; Intel Mac OS X 10_11_0) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/46.0.2490.80 Safari/537.36

Steps to reproduce:

I started a async data request, then rendered a "loading" view, which deeper in the call triggered a synchronous request. Then back at my top level function I added an event listener for the async request. However the async request had already completed and never fired the event listener.

Example code:
  event = ajax('someURL', async: true);
  b();
  event.on('complete', e => console.log('completed'));

  function b() { ajax('someOtherURL', async: false) }


I have a working example here: https://jsfiddle.net/70po71L0/2/


Actual results:

Firefox processes the ajax complete event for the async request, before finishing processing the original event (in which we try set the event listener).

In the JSFiddle example the results div ends up containing "Wrong callback function"


Expected results:

I expect the `event.on` line to be executed before Firefox triggers the ajax complete event.

In the JSFiddle example the results div ends up containing `Callback: { msg: "1 second response" }`

Comment 1

[Jens Stutte [:jstutte]]

Bulk-downgrade of unassigned, >=5 years untouched DOM/Storage bugs' priority.

If you have reason to believe this is wrong (especially for the severity), please write a comment and ni :jstutte.