Ajax example in Wicket

AjaxPage.java

final Form form;
// form initialize
final TextField<String> messageField = new TextField<String>("messageField", Model.of(""));
messageField.add(new AjaxFormComponentUpdatingBehavior ("onkeyup") {
    @Override
    protected void onUpdate(AjaxRequestTarget target) {
        myListenerMethod();
        target.addComponent(form);
    }
});
form.add(messageField);

AjaxPagePartial.html

<input wicket:id="messageField" type="text" size="20" />