Change page in the middle of Ajax request

Question

What happens if I send some ajax request, and immediately change the page (say follow some link) before the request returns? I mean I suppose the XHR object sends a request

Answer 1

The behavior seems to be when the user leaves a page, any outstanding ajax requests complete with 0 as their status. jQuery interprets this as an error, which is why it calls the error handler. In your error handler, you can call the same function that your success handler calls if xhr.status == 0, otherwise execute the desired error behavior.