675182 - Ajax callback functions do not update a global javascript variable

Status: RESOLVED DUPLICATE of bug 637264

(Firefox :: General, defect)

Description

[Peter Sheldon]

Attachment: yourCommunity.js

User Agent: Mozilla/5.0 (Windows NT 5.1; rv:5.0) Gecko/20100101 Firefox/5.0
Build ID: 20110615151330

Steps to reproduce:

I have a page which uses Javascript. It contains 2 ajax callback functions which try to update a global variable. The global variable is never modified in Firefox 5.0. 


Actual results:

The global variable is not updated when this code runs in Firefox 5
It works in IE8, Safari 4.0.4 and Opera 10.63


Expected results:

The global variable should be updated so that when the second callback method is called it does not have the default value of 2.

Comment 1

[Cork]

Do you have a site where this happens?

Cause the .js file isn't enough to test this.

Comment 2

[Peter Sheldon]

See http://www.hertsdirect.org/your-community/?results=true&q=Stevenage

Comment 3

[Peter Sheldon]

...That was where the problem was identified

Comment 4

[Peter Sheldon]

I can probably a more precise example by later on this afternoon

Comment 5

[Peter Sheldon]

Attachment: An improved example

This is a far better example file.
Unfortunately I do not have a live example url yet however I believe that the actual paths in the callback function are irrelevant to recreating the problem

I am seeing this bug on a page which includes:
<script type="text/javascript" src="/js/jquery-1.4.2.min.js"></script>

Comment 6

[Peter Sheldon]

Since I have now found a work around for my particular problem, I will just summarise by saying that currently in Firefox 5 it does not seem possible to update the value of a global variable inside a callback function, and then use that updated value within a different callback method.

Comment 7

[Cork]

Ok, what your seeing is bug 637264, and it has nothing to do with global variables.

What happens is:
1. ajax call A happens
2. ajax call B happens
3. callback alert A happens
4. callback alert B happens
5. global variable is set in callback A
6. global variable is set in callback b
7. global variable is reset in the complete callbacks x 2

Note though that if you remove the alerts you would get these race problems in more browsers then firefox.