"eventName", ";alert('Hello!');"); There are also header items meant to work with JavaScript events. In this way we can execute our code only when a specifc event occurs. Bundle resources ● To reduce event. For the frst three operations we won’t write a single line of JavaScript! Handle AJAX events ● Now we can “ajaxify” components adding AJAX behaviors. In Wicket a behaviors are quite like ● Java 8 lambdas are quite suited for writing callback code, which is what we do to handle AJAX events. ● With Wicket 8 an AJAX click handler can be written leveraging lambdas in the following way:

IRequestListener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 18.3. Wicket events infrastructure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . inside it will be in turn disabled (they will be rendered as ) and it can not fire JavaScript events. Class Component provides two getter methods to determine if a component is visible or enabled: behavior stateful because its callback URL is specific for a given instance of component. 18.3. Wicket events infrastructure Starting from version 1.5 Wicket offers an event-based infrastructure for inter-component

IRequestListener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 195 18.3. Wicket events infrastructure . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . inside it will be in turn disabled (they will be rendered as ) and it can not fire JavaScript events. Class Component provides two getter methods to determinate if a component is visible or enabled: public final void onLinkClicked() { // Invoke subclass handler onClick(); } 18.3. Wicket events infrastructure Starting from version 1.5 Wicket offers an event-based infrastructure for inter-component

IRequestListener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 187 18.3. Wicket events infrastructure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . inside it will be in turn disabled (they will be rendered as ) and it can not fire JavaScript events. Class Component provides two getter methods to determine if a component is visible or enabled: behavior stateful because its callback URL is specific for a given instance of component. 18.3. Wicket events infrastructure Starting from version 1.5 Wicket offers an event-based infrastructure for inter-component

IRequestListener . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 186 18.3. Wicket events infrastructure. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . inside it will be in turn disabled (they will be rendered as ) and it can not fire JavaScript events. Class Component provides two getter methods to determine if a component is visible or enabled: behavior stateful because its callback URL is specific for a given instance of component. 18.3. Wicket events infrastructure Starting from version 1.5 Wicket offers an event-based infrastructure for inter-component