Ajax Events

Ajax requests produce a number of different events that you can subscribe to. Here's a full list of the events and in what order they are triggered.

There are two types of events:

Local Events

These are callbacks that you can subscribe to within the Ajax request object, like so:

 $.ajax({
   beforeSend: function(){
     // Handle the beforeSend event
   },
   complete: function(){
     // Handle the complete event
   }
   // ......
 });

Global Events

These events are triggered on the document, calling any handlers which may be listening. You can listen for these events like so:

 $(document).on("ajaxSend", function(){
   $("#loading").show();
 }).on("ajaxComplete", function(){
   $("#loading").hide();
 });

Global events can be disabled for a particular Ajax request by passing in the global option, like so:

 $.ajax({
   url: "test.html",
   global: false,
   // ...
 });

Events

This is the full list of Ajax events, and in the order in which they are triggered. The indented events are triggered for each and every Ajax request (unless a global option has been set). The ajaxStart and ajaxStop events are events that relate to all Ajax requests together.

• ajaxStart (Global Event)
  This event is triggered if an Ajax request is started and no other Ajax requests are currently running.
  • beforeSend (Local Event)
    This event, which is triggered before an Ajax request is started, allows you to modify the XMLHttpRequest object (setting additional headers, if need be.)
  • ajaxSend (Global Event)
    This global event is also triggered before the request is run.
  • success (Local Event)
    This event is only called if the request was successful (no errors from the server, no errors with the data).
  • ajaxSuccess (Global Event)
    This event is also only called if the request was successful.
  • error (Local Event)
    This event is only called if an error occurred with the request (you can never have both an error and a success callback with a request).
  • ajaxError (Global Event)
    This global event behaves the same as the local error event.
  • complete (Local Event)
    This event is called regardless of if the request was successful, or not. You will always receive a complete callback, even for synchronous requests.
  • ajaxComplete (Global Event)
    This event behaves the same as the complete event and will be triggered every time an Ajax request finishes.
• ajaxStop (Global Event)
  This global event is triggered if there are no more Ajax requests being processed.