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...

For example in your panel:

final AbstractDefaultAjaxBehavior behave = new AbstractDefaultAjaxBehavior() {
    protected void respond(final AjaxRequestTarget target) {
        target.add(new Label("foo", "Yeah I was just called from Javascript!"));
    }
};
add(behave);

...

<script type="text/javascript" wicket:id="myScript">/* script will be rendered here */</script>

Label myScript = new Label("myScript", "callWicket();");
myScript.setEscapeModelStrings(false); // do not HTML escape JavaScript code
add(myScript);

...

If you add any class that extends AbstractDefaultAjaxBehavior to your page, wicket-ajax.js will be added to the header ofyour web page. wicket-ajax.js provides you with two basic methods to call your component:

Wicket 6.0+

You use Wicket.Ajax.get( ) and Wicket.Ajax.post( ) in JavaScript to do an Ajax call to Wicket manually. In Wicket 6, AbstractDefaultAjaxBehavior also has a convenience method to generate a JavaScript function that performs the call: getCallbackFunction(...). This method can also generate functions that pass parameters from JavaScript to Wicket.

Older Versions

function wicketAjaxGet(url, successHandler, failureHandler, precondition, channel)
and
function wicketAjaxPost(url, body, successHandler, failureHandler, precondition, channel)

Here is an example:

Example - Wicket 6.0+

This snippet is taken from a piece of code that makes use of PackageTextTemplate, which is added in the renderHead( component, response ) of AbstractDefaultAjaxBehavior

		String componentMarkupId = component.getMarkupId();
		String callbackUrl = behave.getCallbackUrl().toString();

		Map<String, Object> map = new HashMap<>();
		map.put( "callbackUrl", callbackUrl );
		map.put( "args", "Your Arguments Here" );
		map.put( "componentMarkupId", componentMarkupId );

		PackageTextTemplate ptt = new PackageTextTemplate( clazz, "resources/main.js" );
		OnDomReadyHeaderItem onDomReadyHeaderItem = OnDomReadyHeaderItem.forScript( ptt.asString( map ) );

var wcall = Wicket.Ajax.get({ u: '${callbackUrl}' + '${args}' });

Example - Older Versions

function callWicket() {
   var wcall = wicketAjaxGet('$url$' + '$args$', function() { }, function() { });
}

...

Ok, this is actually quite ugly, but you get the optional arguments in the response method like this:

IRequestParameters params = RequestCycle.get().getRequest().getRequestParameters();

Or to retrieve a single parameter by its key:

String paramFoo = RequestCycle.get().getRequest().getRequestParameters().getParameterValue("foo");