[jQuery] Problem with Ajax and Firefox - request status is 0

[Mario Villar]

Hi everyone. I'm having trouble using the $ajax() jQuery function.

The same happens to me in three diferent Ajax calls in two different
projects. I'll post sample code of one of them, since I can't really
find a pattern common to all three (but different than the other Ajax
calls in my code that work as expected):

function ajaxSendForm() {
   data = {
      command: 'save',
      // a bunch of parameter names and values taken from the form
   };
    $.ajax({
        url: "ajaxOrderForm.aspx",
        type: "POST",
        dataType: "xml",
        cache: false,
        data: data,
        error: function(req, err, obj) {
            alert ("Error in Ajax call: " + err + " - " + req.status);
       },
       success: function (xml) {
             // Process return data
       }
   });
}

This produces an alert with the text: "Error in Ajax call:  - 0", that
is, empty error message and a value of 0 for the status member of the
HttpXMLRequest object. If I check the server logs I can see that the
server code is being executed. This only happens in Firefox (version
2.0.0.11, Firebug 1.05 installed), not Internet Explorer; and if I
execute the Ajax call again, it does work as expected. I have
introduced
this patch that seems to do the trick:

        error: function(req, err, obj) {
            // _sffirst is a global variable initialized to true;
            if (_sffirst && (req.status == 0) ) {
                _sffirst = false;
                ajaxSendForm();
            } else {
                alert ("Error in Ajax call: " + err + " - " +
req.status);
            }
        },

This is somewhat acceptable for data recovery, but not for data
storage - I don't want every order to be recorded twice!

Has anyone else encountered this problem? Is it an error in jQuery, in
the native HttpXMLRequest object, or is it something I'm doing wrong?

Thanks in advance.