Examples of org.zkoss.zk.ui.Component.addEventListener()

org.zkoss.zk.ui.Component.addEventListener()
Adds an event listener to specified event name for this component. The second registration is ignored and false is returned.
You could register listener to all components in the same page by use of {@link Page#addEventListener}. @param evtnm what event to listen (never null) @return whether the listener is added; false if it was added before @see Page#addEventListener


    //other url, assume login fail
    if (!comp.isListenerAvailable(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, true)) {
      final EventListener listener = new ShowWindowEventListener();
      comp.setAttribute(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, listener);
      comp.addEventListener(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, listener);
    }
    
      Events.postEvent(new Event(ZkAuthenticationEntryPoint.ON_ACEGILOGIN, comp, url));
  }

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      final Component comp = (Component) request.getAttribute(ZkEventExceptionFilter.COMPONENT);
    if (!comp.isListenerAvailable(ON_ACCESSDENIED, true)) {
      final EventListener listener = new ShowWindowEventListener();
      comp.setAttribute(ON_ACCESSDENIED, listener);
      comp.addEventListener(ON_ACCESSDENIED, listener);
    }
    final String url = getErrorPage();
      Events.postEvent(new Event(ON_ACCESSDENIED, comp, url != null ? url : "~./accessDenied.zul"));
    }
}

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          SaveEventListener listener = (SaveEventListener)
            target.getAttribute("zk.SaveEventListener."+evtname);
          if (listener == null) {
            listener = new SaveEventListener();
            target.setAttribute("zk.SaveEventListener."+evtname, listener);
            target.addEventListener(evtname, listener);
          }
          listener.addDataTarget(this, comp);
        }
      }
      if (_saveAfterEvents != null) {

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          SaveAfterEventListener listener = (SaveAfterEventListener)
            target.getAttribute("zk.SaveAfterEventListener."+evtname);
          if (listener == null) {
            listener = new SaveAfterEventListener();
            target.setAttribute("zk.SaveAfterEventListener."+evtname, listener);
            target.addEventListener(evtname, listener);
            target.addEventListener(evtname+"SaveAfter", listener);
          }
          listener.addDataTarget(this, comp);
        }
      }

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            target.getAttribute("zk.SaveAfterEventListener."+evtname);
          if (listener == null) {
            listener = new SaveAfterEventListener();
            target.setAttribute("zk.SaveAfterEventListener."+evtname, listener);
            target.addEventListener(evtname, listener);
            target.addEventListener(evtname+"SaveAfter", listener);
          }
          listener.addDataTarget(this, comp);
        }
      }
    }

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    ((HttpServletRequest)request).getSession().setAttribute(ZkEventExceptionFilter.EVENT, evt);          


    if (!comp.isListenerAvailable(ON_ACEGILOGIN, true)) {
      final EventListener listener = new ShowWindowEventListener();
      comp.setAttribute(ON_ACEGILOGIN, listener);
      comp.addEventListener(ON_ACEGILOGIN, listener);
    }
    final String url = getLoginFormUrl();
      Events.postEvent(new Event(ON_ACEGILOGIN, comp, url != null ? url : "~./acegilogin.zul"));
    }
}

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          LoadEventListener listener = (LoadEventListener)
            target.getAttribute("zk.LoadEventListener."+evtname);
          if (listener == null) {
            listener = new LoadEventListener();
            target.setAttribute("zk.LoadEventListener."+evtname, listener);
            target.addEventListener(evtname, listener);
          }
          listener.addDataTarget(this, comp);
        }
      } 
      if (_loadAfterEvents != null) {

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          LoadAfterEventListener listener = (LoadAfterEventListener)
            target.getAttribute("zk.LoadAfterEventListener."+evtname);
          if (listener == null) {
            listener = new LoadAfterEventListener();
            target.setAttribute("zk.LoadAfterEventListener."+evtname, listener);
            target.addEventListener(evtname, listener);
            target.addEventListener(evtname+"LoadAfter", listener);
          }
          listener.addDataTarget(this, comp);
        }
      }

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            target.getAttribute("zk.LoadAfterEventListener."+evtname);
          if (listener == null) {
            listener = new LoadAfterEventListener();
            target.setAttribute("zk.LoadAfterEventListener."+evtname, listener);
            target.addEventListener(evtname, listener);
            target.addEventListener(evtname+"LoadAfter", listener);
          }
          listener.addDataTarget(this, comp);
        }
      }
    }

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  private void addEventListeners0(Object target, String evtname, Set listeners) {
    if (target instanceof Component) {
      final Component target0 = (Component) target;
      for (final Iterator it = listeners.iterator(); it.hasNext();) {
        final EventListener listener = (EventListener) it.next();
        target0.addEventListener(evtname, listener);
      }
    } else if (target instanceof Page) {
      final Page target0 = (Page) target;
      for (final Iterator it = listeners.iterator(); it.hasNext();) {
        final EventListener listener = (EventListener) it.next();

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