jQuery $ .ajax在错误处理程序中返回未定义的jqXHR

Question

I have the following Ajax call:

$.ajax({
        type: 'POST',
        contentType: 'application/json',
        url: reply_url,
        data: reply_data,            
        success: function(data, textStatus, xhr) {
          location.reload();
        },
        error: function(jqXHR, exception) {
          alert(jqXHR.status);
        }
      });

And I'm getting the following error when the server returns 500:

Uncaught TypeError: Cannot read property 'status' of undefined 

What are the cases where jqXHR could be undefined?

PS: I'm using Jquery v1.8.3

EDIT:

I noticed that this happens only in Ajax calls to my Ruby on Rails application. Ajax calls to another domains returns jqXHR as exptected.

Answer 1

As you can see here: http://jsbin.com/rajusolu/1/edit?js,output

your request function does actually work.... (I tested it also with jQuery 1.8.3 and works fine). If you want to try that link remember to select "Add library" > "jQuery".

If you see that error then is something related to some other part of your code, because the snippet you provided works fine.