Wicket 6.2 AbstractDefaultAjaxBehavior getCallbackUrl no longer resolves JS variables

Wicket Ajax has been completely rewritten for Wicket 6. See this page for a detailed description.

In your case, you should use the new AjaxRequestAttributes like that:

@Overrideprotected void updateAjaxAttributes(final AjaxRequestAttributes attributes) {    super.updateAjaxAttributes(attributes);    attributes.getExtraParameters().put("hiddenvalue", "value");}

Retrieval of the value from the request still works the same as before.

@Overrideprotected void respond(AjaxRequestTarget target){    getRequest().getRequestParameters().getParameterValue("hiddenvalue");}

Another cleaner approach is to use the callback function

        AbstractDefaultAjaxBehavior ajaxBehavior = new AbstractDefaultAjaxBehavior() {        @Override        protected void respond(AjaxRequestTarget target) {            String param1Value = getRequest().getRequestParameters().getParameterValue(AJAX_PARAM1_NAME).toString();            String param2Value = getRequest().getRequestParameters().getParameterValue(AJAX_PARAM2_NAME).toString();            System.out.println("Param 1:" + param1Value + "Param 2:" + param2Value);        }        @Override        public void renderHead(Component component, IHeaderResponse response) {            super.renderHead(component, response);            String callBackScript = getCallbackFunction(CallbackParameter.explicit(AJAX_PARAM1_NAME), CallbackParameter.explicit(AJAX_PARAM2_NAME)).toString();            callBackScript = "sendToServer="+callBackScript+";";            response.render(OnDomReadyHeaderItem.forScript(callBackScript));        }    };    add(ajaxBehavior);

Define a variable for the function in your javascriptvar sendToServer;

It will be initialized on dom ready event by wicket with the callback function

Call sendToServer(x,y) from javascript to pass the parameters to the server.

private static final String MY_PARAM = "myparam";public static class SampleCallbackBehavior extends AbstractDefaultAjaxBehavior {            @Override    public void renderHead(Component component, IHeaderResponse response) {        super.renderHead(component, response);        response.render(OnDomReadyHeaderItem.forScript("var myfunction : " + getCallbackFunction(CallbackParameter.explicit(MY_PARAM))));    }    @Override    protected void respond(AjaxRequestTarget target) {        StringValue paramValue = getComponent().getRequest().getRequestParameters().getParameterValue(MY_PARAM);        //TODO handle callback    }       }

After this, you should only call the function from javascript

myfunction("paramValue");