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Request.JSONP race condition with option link: cancel #1052

jtrosby opened this Issue Oct 17, 2011 · 3 comments


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jtrosby commented Oct 17, 2011 edited by arian

I have been able to reproduce this in Firefox only (6 and 7), chrome is ok, IE has not been tested.

The cancel function runs the clear function with destroys the last script element like this:

clear: function(){
    this.running = false;
    if (this.script){
        this.script = null;
    return this;

However, in firefox, this does not actually stop the javascript returned by the jsonp server from running. The reference to this.success in Request.JSONP.request_map still exists for each jsonp request and the callback will be run for all the requests, even the cancelled ones. The order in which the callbacks will execute is random and only the first callback will actually run because of the success function:

success: function(args, index){
    if (!this.running) return;
        .fireEvent('complete', args).fireEvent('success', args)

The first callback will set this.running to false in the clear function and all following callbacks will immediately return because this.running is false.

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@jtrosby jtrosby closed this Oct 18, 2011

@jtrosby jtrosby reopened this Oct 18, 2011


arian commented Oct 18, 2011

I was also thinking about just setting that callback to an empty function, so it wouldn't do anything..

jtrosby commented Oct 19, 2011

That would do it too. The code for deleting from request_map isn't required to make it work

@jtrosby jtrosby closed this Oct 19, 2011

@jtrosby jtrosby reopened this Oct 19, 2011

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