Whenever an Ajax request completes successfully, jQuery triggers the ajaxSuccess event. Any and all handlers that have been registered with the .ajaxSuccess() method are executed at this time.

To observe this method in action, we can set up a basic Ajax load request:

<div class="trigger">Trigger</div>
<div class="result"></div>
<div class="log"></div>

We can attach our event handler to any element:

$('.log').ajaxSuccess(function() {
  $(this).text('Triggered ajaxSuccess handler.');
});

Now, we can make an Ajax request using any jQuery method:

$('.trigger').click(function() {
  $('.result').load('ajax/test.html');
});

When the user clicks the button and the Ajax request completes successfully, the log message is displayed.

Note: Because .ajaxSuccess() is implemented as a method of jQuery object instances, we can use the this keyword as we do here to refer to the selected elements within the callback function.

All ajaxSuccess handlers are invoked, regardless of what Ajax request was completed. If we must differentiate between the requests, we can use the parameters passed to the handler. Each time an ajaxSuccess handler is executed, it is passed the event object, the XMLHttpRequest object, and the settings object that was used in the creation of the request. For example, we can restrict our callback to only handling events dealing with a particular URL:

Note: You can get the returned ajax contents by looking at xhr.responseXML or xhr.responseHTML for xml and html respectively.

$('.log').ajaxSuccess(function(e, xhr, settings) {
  if (settings.url == 'ajax/test.html') {
    $(this).text('Triggered ajaxSuccess handler. The ajax response was:' 
                     + xhr.responseHTML );
  }
});