gistfile1.js

MyApp.Ajax = {
	// contains the list of handler to be invoked
	// after ajax response
	postAjaxHandlers : [],
	// contains the ids of the changed elements
	changedDomIds : [],
	// registers the post ajax handles
	registerPostAjax : function(fn) {
		this.postAjaxHandlers.push(fn);
	},
	// this should be invoked by the the wicket
	handle : function(changed) {
		this.changedDomIds = changed;
	},
	// fires the post ajax event with collection of updated dom
	firePostHandlers : function() {
		var that = MyApp.Ajax;
		// fire the hanldler only if there is updated dom ids
		if (!that.changedDomIds.length == 0) {
			var selector = '';
			$.each(that.changedDomIds, function() {
				selector += '#' + this + ',';
			});
			var elements = $(selector);
			// invoke the handlers
			$.each(that.postAjaxHandlers, function() {
				this(elements);
			});
			// clear the ids
			that.changedDomIds = [];
		}
	}
};

MyApp.Ajax.registerPostAjax(function(changed$){
	// do you work here
	changed$.find('mydiv.myclass');
});

// register the handlers
$(document).ready(function() {
	if (Wicket.Ajax) {
	Wicket.Ajax.registerPostCallHandler(MyApp.Ajax.firePostHandlers);
	}
});

gistfile2.java

/**
 * fires a event with the collection of all the updated dom elements after
 * the wicket ajax response. To subscribe the event call the
 * <code>MyApp.Ajax.registerPostAjax</code>. Your callback function
 * will be called with a jQuery Wrapped set of all the update dom as the
 * first argument.
 * 
 * NOTE: call this only once after all the components are added to the
 * target
 * 
 * 
 * @param target
 *            ajax target
 */
public void firePostAjaxUpdateEvent(final AjaxRequestTarget target)
{
	final StringBuffer script = new StringBuffer(" MyApp.Ajax.handle([");
	for (final Component component : target.getComponents())
	{
		script.append("\"" + component.getMarkupId() + "\",");
	}
	script.append("])");

	target.getHeaderResponse().renderOnDomReadyJavascript(script.toString());
}

gistfile3.java

/**
 * sample usage
 */
@Override
protected void onSubmit(final AjaxRequestTarget target)
{
	// add all the components
	firePostAjaxUpdateEvent(target);
}