Hi Sibgha, // here is a simple code
// // in your Dpanel // protected void onUpdate(AjaxRequestTarget target) { send(getPage(), Broadcast.EXACT, new YourEvent(yourDataFromYourDropDownChoice)); } // // in your HomePage, you override the onEvent method // @Override public void onEvent(IEvent<?> event) { super.onEvent(event); if (event.getPayload() instanceof YourEvent) { YourEvent yourEvent = (YourEvent) = event.getPayload(); // the data you sent throw your vent YourData xyz = yourEvent.getData(); // if you don't neeed anymore your event event.stop(); } } // look at the docs https://ci.apache.org/projects/wicket/guide/8.x/single.html#_wicket_events_infrastructure François follow Apache Wicket on twitter : https://twitter.com/apache_wicket <https://twitter.com/apache_wicket> ! > Le 26 mai 2019 à 15:33, Sibgha Nazir <sibgha...@gmail.com> a écrit : > > Hi, > > In my application, Home Page creates DPanel and Dpanel has the drop down > menu. In the class DPanel at 'onchange' event, I want to do some action > in the class HomePage.java. How can that be possible? > > > *HomePage.java* public HomePage(final PageParameters parameters) > { > super(parameters); > > final Panel dropDownPanel = new Dpanel("toReplace"); > > dropDownPanel.setOutputMarkupId(true); > add(dropDownPanel); > } > > > *DPanel.java* public Dpanel(String aId) > { > super(aId); > form = new Form<Void>("form"); > form.setOutputMarkupId(true); > > // SelectMenu // > final DropDownChoice<String> dropdown = new > DropDownChoice<String>("select", new Model<String>(), new > ListModel<String>(GENRES)); > dropdown.setRequired(true); > dropdown.setOutputMarkupId(true); > dropdown.add(new AjaxFormComponentUpdatingBehavior("change") { > /** > * > */ > private static final long serialVersionUID = > -6744838136235652577L; > > protected void onUpdate(AjaxRequestTarget target) { > System.out.println("Changed"); > > } > }); > . > . > . > . > > Quick Start here... > https://github.com/Sibgha360/dropdownexample.git,