Track performance in log using zk

By Sitansu S Swain

Assuming you want to log all UI events on the server side, please implement an
EventInterceptor like this

    import org.zkoss.zk.ui.event.Event;

    import org.zkoss.zk.ui.util.EventInterceptor;

 

    public class LogEventInterceptor implements EventInterceptor {

public Event beforeProcessEvent(Event event) {

System.out.println(event.getName() + " event received for + "

+ event.getTarget().getId() + "!!!");

return event;

}

    // rest of the impl

and then configure it in your zk.xml as below

    <listener>
    <listener-class>foo.LogEventInterceptor</listener-class>
    </listener>

For a simple zul file like this

    <window border="normal" title="Intercepting UI Events demo">
    <button id="helloBtn" label="Click me to Say hello"
    onClick='alert("Hello !!!")'>
    </button>
    </window>

then clicking on helloBtn will generate following log on server console

    onClick event received for + helloBtn !!!

  [1]: http://www.zkoss.org/javadoc/latest/zk/org/zkoss/zk/ui/util/EventInterceptor.html
  [2]: http://books.zkoss.org/wiki/ZK_Configuration_Reference/zk.xml/The_listener_Element/The_org.zkoss.zk.ui.util.EventInterceptor_interface