在GWT中确认浏览器退出 [英] Confirm Browser Exit in GWT

问题描述

我想在用户试图离开我的GWT应用程序时显示一个确认对话框。如果用户选择留在应用程序中，则不做任何事情，否则应用程序应在关闭前首先向服务器发送注销请求。

我该怎么做？

使用哪个处理程序？

Window.addCloseHandler

或

Window.addWindowClosingHandler

解决方案

它的方法， addWindowClosingHandler 似乎是你需要的。

编辑：我认为你需要做的是... 当窗口关闭时，即当用户点击关闭或重新加载按钮时，调用addWindowClosingHandler 。当窗口关闭时调用 addCloseHandler 。所以你使用 ！您使用结束处理程序来显示确认对话框，然后使用关闭处理程序来完成您只想关闭时执行的操作。

  Window.addWindowClosingHandler（new Window.ClosingHandler（）{
 @Override 
 public void onWindowClosing（ClosingEvent event）{
 event.setMessage（Do you want to close？）; 
 System.out.println（Closing ...）; 
} 
}）; 
 
 Window.addCloseHandler（new CloseHandler< Window>（）{
 @Override 
 public void onClose（CloseEvent< Window> event）{
 System.out.println （Closed！）; 
} 
}）; 
  

I want to display a confirmation dialog when users tries to leave my GWT application. If the user chooses to stay in the app, nothing is done otherwise the application should first send a logout request to the server before closing.

How can I do that?

which handler to use?

Window.addCloseHandler

or

Window.addWindowClosingHandler

解决方案

Based on the methods it has, addWindowClosingHandler seems to be what you need.

EDIT: I think what you need to do is... addWindowClosingHandler is called when the window is closing, i.e. when the user clicks the close or reload button. addCloseHandler is called when the Window closes. So you use both! You use the closing handler to display a confirmation dialog, then you use the close handler to do the stuff you only want to do on close.

    Window.addWindowClosingHandler(new Window.ClosingHandler() {
        @Override
        public void onWindowClosing(ClosingEvent event) {
            event.setMessage("Do you wanna close?");
            System.out.println("Closing...");
        }
    });

    Window.addCloseHandler(new CloseHandler<Window>() {
        @Override
        public void onClose(CloseEvent<Window> event) {
            System.out.println("Closed!");
        }       
    });

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