jQuery Forum

Hi,

I don't use jquery.ajaxmanager.js and i get the same error when i'm trying to abort a Ajax request with jQuery 1.4.2 and IE7. Just do something like the code below to repoduce the bug :

1. var xhr = $.ajax(...);
2. xhr.abort();

For what it's worth -- I did not end up fully resolving or tracking down this issue, and reverted to jQuery 1.3.2. Making another attempt to migrate to 1.4 is on my to-do list, but I haven't come back to it quite yet.

Still very interested to see where this goes if it does turn out to be a problem in one of the core libraries.

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$("#BenjaminPottle")

This is a total off-the-top-of-my-head first guess, but have you checked to make sure IE7 allows modification of the version of XHR it supports? Several times in the past I've run into situations where IE exposes a temperamental ActiveX object to JS and any attempts to modify it result in errors like this.

Does IE's xhr object support the Javascript call method? I didn't think it did. Most IE host objects (window.alert, window.confirm, etc.) aren't proper Javascript objects.

By the time the xhr.abort handler is called, it's outside the dynamic call chain of the try/catch. The comments seem to indicate the failure was expected in IE. I'll move this to the Core forum, it seems like it will need some change even if it's just a try/catch around the oldAbort.call() there.

*EDIT*

Sorry, should have re-read your post a second time, now I understand why the outer try/catch doesn't work :-)


Either way, thanks for looking into this -- I had a hell of a time trying to find the "right" fix and I'm sure a few other sets of eyes will help now that we have a simple way of reproducing it.

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$("#BenjaminPottle")

Hi, I found this seems to relate to jQuery bug 6314 (http://dev.jquery.com/ticket/6314). In IE7, if "Enable native XMLHTTP support" is checked (under Tools > Internet Options > Advanced tab > inside the security section) then this error shows up. Unchecking/disabiling the option seems to resolve the error.

Oops, must have missed an email saying the thread was updated -- just saw the above, thank you Doug! I'll try it this week. I've attempted to modify that section before and was able to mask the bug but not resolve it. Your method looks a little different. I'll let you know how it goes!

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$("#BenjaminPottle")

I've had the same troubles. But I think I figured it now:
 - JQuery uses a XMLHttpRequest in IE7+. However, in IE7 this isn't an entirely native javascript object. (In IE8 it is, as far as I can tell).
 - JQuery changes the abort method for Opera which doesn't fire onreadystatechange.
 - Since the XMLHttpRequest is not a native javascript object, IE7 fails here somehow.I do not want to change the library code of JQuery, so I've come up with a temporary solution. (Based on the "Enable native XMLHTTP support" check fix).

In your ajax call, just construct the XMLHttpRequest in IE7(-) using ActiveX:

1.  $.ajax({
       ...
       xhr: function() {
           if ($.browser.msie && $.browser.version.substr(0,1) <= 7)
               return new ActiveXObject("Microsoft.XMLHTTP");
           else
               return new XMLHttpRequest();
       },
       ...
   });

I only tested this on IE7, IE8 and firefox 3.6 though. :)

This is definitely quite a major bummer, since I made the switch to jQuery 1.4.2 in the latest release of a CMS I develop, and I too have been struck by this issue.

The code from mproce was on the right track, but for me, it STILL gave me this javascript error *IN IE8* (8.0.6001.18702 to be exact), thus I had to remove the condition in his code checking if the version of IE was only 7 or lower - ensuring it catches any version of IE (including 8) did the trick for me. Idealy it would be nice if jQuery didn't even have this issue since it is supposed to be cross-platform (and shouldn't require additional tweaks, or configurations in the browser to work).

Also, it is possible to set this rule for ALL ajax requests automatically using ajaxSetup. Here is how I get it to work for all my ajax requests without having to add this rule to each and every request; just add this in your document's head:

1. <script type='text/javascript'>
   $(function ()
       {
       $.ajaxSetup
           ({
           xhr: function()
               {
               if ($.browser.msie)
                   {
                   return new ActiveXObject("Microsoft.XMLHTTP");
                   }
               else
                   {
                   return new XMLHttpRequest();
                   }
               }
           })
       });
   </script>

Hopefully this issue gets some attention paid to it in the next jQuery release, since it still exists in the latest stable (1.4.2).

Here's the ticket http://dev.jquery.com/ticket/6498