How to handle jQuery ajax post error when navigating away from a page

Question

Is there a way to handle the error from an ajax request within JQuery such that when the user navigates away from the page, the resulting error is ignored?

$(document).ready(function() {  $.ajax( {     url:'/server/url/',     type: 'POST',     data: {some..data},     success:function(response) { do stuff with response },     error: function(xhr, textStatus, errorThrown) {            // Don't raise this alert if user has navigated away from the page            alert('error');     } }); 

I'm curious if anybody knows of a clean way to handle this? I know you could create some logic in a $(window).bind("beforeunload", function(){}) method but I'd prefer if there was a way to handle the situation without doing this since Chrome appears to no longer support it. Is there for example a specific error that is returned in this case?

Thanks.

Answer 1

It looks like the answer to this is to examine the jqXHR.status. The XMLHttpRequest spec outlines these steps to set the status:

The status attribute must return the result of running these steps:

1. If the state is UNSENT or OPENED, return 0 and terminate these steps.

2. If the error flag is set, return 0 and terminate these steps.

3. Return the HTTP status code.¹

NOTE also: The error flag indicates some type of network error or request abortion. It is initially unset and is used during the DONE state.

From what I understand therefore, this code check should fix the issue:

    if (xhr.status == 0)         alert('error'); 

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¹_{https://web.archive.org/web/20120204040047/http://www.w3.org/TR/XMLHttpRequest/#the-status-attribute}