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#14816 closed bug (notabug)

Opened February 18, 2014 02:12PM UTC

Closed February 24, 2014 03:08PM UTC

Last modified March 06, 2014 07:16PM UTC

doing cross-domain syncronous ajax request within a jsonp ajax request - syncronous flag is not respected for the internal requests

Reported by: Owned by:
Priority: undecided Milestone: None
Component: unfiled Version: 1.10.1
Keywords: Cc:
Blocked by: Blocking:

Hi Guys,

we came across a jQuery problem when doing the following

  • do an ajax request from
  • get a jsonp-Response like
url: "",
dataType: "script",
cache: true,
async: false

var myObject = new MyObject();

Here get an error because the MyObject.js is not loaded although the ajax request is marked as with async:false.

We tried to debug the problem and we also read the manual which says, that jsonp-Requests always will be called with async:true.

but in this case only the first request is a jsonp-Request. so we guess jQuery should respect the configuration of non-jsonp-Requests by e.g. resetting the transportation to non-jsonp.

We found this behavior in jQuery-Version 1.8.3 up to 1.10.1

Attachments (0)
Change History (3)

Changed February 24, 2014 03:08PM UTC by dmethvin comment:1

resolution: → notabug
status: newclosed

The docs for async say: " Cross-domain requests and dataType: "jsonp" requests do not support synchronous operation."

Changed March 06, 2014 08:56AM UTC by Tobias Hein <> comment:2

Hi Guys,

sorry for the embarrasment regarding my bug report. it seems as i has not pointed out the problem well. as i mentioned, we read the manual and there is no doubt that

Cross-domain requests and dataType: "jsonp" requests do not support synchronous operation."

Thats not our problem. the problem is, that we fetch javascript code by a jsonp request. this javascript code executes an independent ajax request. this ajax-request should be executed synchronously - but instead, because its code has been loaded by an asychnronous "jsonp"-request, it is also exectuted asynchronously.

Changed March 06, 2014 07:16PM UTC by anonymous comment:3

In your example, you're using a cross-domain "script" request which by its very nature cannot be synchronous since it must use script tag injection.