public static final class Helper {
private static final Property<HandlerReferenceSet> HANDLERS = Property.mutable("handlers");
public static void registerJsHandler(ContentElement element,
Element nodelet, String event, JavaScriptEventListener handler) {
HandlerReferenceSet handlers = element.getProperty(HANDLERS);
if (handlers == null) {
handlers = new HandlerReferenceSet();
element.setProperty(HANDLERS, handlers);
}
handlers.references.add(DomHelper.registerEventHandler(nodelet, event, handler));
}