[CONF] Apache Wicket: Calling Wicket from Javascript (page created)

[confluence]

Page Created : WICKET : Calling Wicket from _javascript_ Calling Wicket from _javascript_ has been created by Erik van Oosten (Jan 13, 2008). Content: This mini tutorial shows you how to call Wicket from _javascript_. It is based on an e-mail from Michael Sparer. Setup the Wicket response to the _javascript_ call Add the AbstractDefaultAjaxBehavior to the component you'd like to call from _javascript_. You then have to override the respond method of AbstractDefaultAjaxBehavior to perform your actions and to append your changes to the response For example in your panel: {{{ final AbstractDefaultAjaxBehavior behave = new AbstractDefaultAjaxBehavior() { protected void respond(final AjaxRequestTarget target) Unknown macro: { target.add(new Label("foo", "Yeah I was just called from _javascript_!")); } }; add(behave); }}} Add the calling _javascript_ to the page header Any component can add _javascript_ to the page header by implementing IHeaderContributor, that's where the response-object gets passed. TODO: add an example of Java code. Here is an example _javascript_ code: {{{function callWicket() { var wcall = wicketAjaxGet('$url$' + '$args$', function() { }, function() { }); } }}} '$url$' is obtained from the method behave.getCallbackUrl(). If you paste the String returned from that method into your browser, you'll invoke the respond method, the same applies for the _javascript_ method. You can optionally add arguments by appending these to the URL string. They take the form &foo=bar&. Obtaining the arguments Ok, this is actually quite ugly, but you get the optional arguments in the response method like so: Unknown macro: { Map map = ((WebRequestCycle) RequestCycle.get()).getRequest().getParameterMap(); }

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