在点击GWT中的其他链接之后，定时器仍在点燃 [英] Timer is still firing after Clicking on other Links in GWT

问题描述

所以我有一个计时器，即使我清除面板并加载了其他模型，它也会持续启动......我的问题是，如何在卸载模型时取消计时器？

$
$ b

  public Display（List< Clarification> result）{
 
 if（result.size（）== 0）{
 Window.alert（EMPTY）; 
} else {
 
 
 RootPanel.get（Dev1）。clear（）; 
 t = new Timer（）{
 public void run（）{
 
 cd = new ClarificationDispatcher（）; 
 cd.getClarificationsCount（result.size（））; 
} 
}; 
 t.scheduleRepeating（5000）; 
  

}

我尝试取消然而，定时器onUnload（）方法，我不相信它会被调用......
$ b

谢谢！

解决方案

步骤遵循

• 使用 window.onunload code>在刷新页面时调用的事件

• 第一次导出 cancelTimer（）使用JSNI和register注册java脚本的方法 cancelTimerFunction 作为在页面上调用的Java脚本函数


• 在窗口关闭时取消定时器
  
ul>



代码：

  import com.google.gwt.user.client。定时器; 
 import com.google.gwt.user.client.Window; 
 
 private static Timer timer = null; 
 
 public void onModuleLoad（）{
 exportCancelTimer（）; 
 
最终标签标签=新标签（你好）; 
 timer = new Timer（）{
 
 @Override 
 public void run（）{
 label.setText（Hello+ Math.random（）* 100 ）; 
} 
 
}; 
 
 timer.scheduleRepeating（500）; 
 RootPanel.get（）。add（label）; 
 
 Window.addCloseHandler（new CloseHandler< Window>（）{
 $ b $ @Override 
 public void onClose（CloseEvent< Window> event）{
 timer .cancel（）; 
} 
}）; 
 
 
 
 $ b public static void cancelTimer（）{
 if（timer！= null）{
 System.out.println（） 取消）; 
 timer.cancel（）; 
 
 
 
 public static native exportCancelTimer（）/ *  -  {
 $ wnd.cancelTimerFunction = $ entry（@ com.xyzGWTProject :: cancelTimer（ ））; 
 $ wnd.onunload = $ wnd.cancelTimerFunction; 
}  -  * /; 
  




So I have a timer and it keeps on firing even though I cleared the Panel and loaded other model... my question is, how to cancel a timer when I unload a model?

So here is part of my code

public Display(List<Clarification> result) {

    if (result.size() == 0) {
        Window.alert("EMPTY");
    } else {


        RootPanel.get("Dev1").clear();
         t = new Timer() {
            public void run() {

                cd = new ClarificationDispatcher();
                cd.getClarificationsCount(result.size());
            }
        };
        t.scheduleRepeating(5000);

}

I tried to cancel the Timer onUnload() method however, I don't believe it is getting called at all...

Thanks!

解决方案

Steps to follow

• use window.onunload event that is called when page is refreshed
• first export cancelTimer() method to java script using JSNI and register cancelTimerFunction as java script function that is called on page unload
• cancel timer on window close

Code:

import com.google.gwt.user.client.Timer;
import com.google.gwt.user.client.Window;

private static Timer timer = null;

public void onModuleLoad() {
    exportCancelTimer();

    final Label label = new Label("Hello ");
    timer = new Timer() {

        @Override
        public void run() {
            label.setText("Hello " + Math.random() * 100);
        }

    };

    timer.scheduleRepeating(500);
    RootPanel.get().add(label);

    Window.addCloseHandler(new CloseHandler<Window>() {

        @Override
        public void onClose(CloseEvent<Window> event) {
            timer.cancel();
        }
    });

}


public static void cancelTimer() {
    if (timer != null) {
        System.out.println("cancel");
        timer.cancel();
    }
}

public static native void exportCancelTimer() /*-{
    $wnd.cancelTimerFunction = $entry(@com.x.y.z.GWTProject::cancelTimer());
    $wnd.onunload = $wnd.cancelTimerFunction;
}-*/;

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