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An Ajax request can have 0 or more IAjaxCallListener's.
o.a.w.ajax.attributes.AjaxCallListener is an adapter of IAjaxCallListener that implements all methods with noop bodies. If the body returns null or empty string then it is discarded.

Global Ajax call listeners

IAjaxCallListener's can be used to listen for the lifecycle of an Ajax call for a specific component.
If the user application needs to listen for all Ajax calls then it may subscribe to the following topics:

• /ajax/call/before
• /ajax/call/after
• /ajax/call/success
• /ajax/call/failure
• /ajax/call/complete

Those replaces the old Wicket.Ajax.(registerPreCallHandler|registerPostCallHandler|registerFailureHandler) methods.

Example:

    Wicket.Event.subscribe('/ajax/call/failure', function(jqEvent, errorThrown, attributes, jqXHR, textStatus) {
      // do something when the Ajax call fails
    });

All global listeners receive the same arguments as the respective IAjaxCallListener handler plus jQuery.Event that is passed by the PubSub system. This event is not the event that causes the Ajax call. The one that caused the Ajax call is 'attrs.event'.

Automatically migrated attributes.

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