如何捕捉用户离开页面并取消页面

问题描述

当用户离开 GWT 应用程序时，我想打开一个确认对话框并为他们提供留下的选择，即 Confirm("你确定要离开此页面吗", "yes", "no").

When a user leaves the GWT app, I would like to open a confirm dialog and offer them the choice to stay, i.e. Confirm("are you sure you want to leave this page", "yes", "no").

我知道如何构建拨号框.:)

I know how to build the dialbox. :)

问题是，如何捕捉用户离开页面的事件以及如何取消它?

The question is, how to I catch the event of a user leaving the page and how to I cancel it?

丹尼尔

推荐答案

致电 Window.addWindowClosingHandler，并将其传递给调用 setMessage 在 Window.ClosingEvent 上，像这样:

Call Window.addWindowClosingHandler, and pass it a callback that calls setMessage on the Window.ClosingEvent, like so:

Window.addWindowClosingHandler(new Window.ClosingHandler() {
      public void onWindowClosing(Window.ClosingEvent closingEvent) {
        closingEvent.setMessage("Do you really want to leave the page?");
      }
    });

(我已经添加了 GWT 2.0 文档的链接；将这些 URL 中的 2.0 更改为 1.6 以查看 GWT 1.6/1.7 文档.)

(I've put in links to the GWT 2.0 docs; change the 2.0 to 1.6 in those URLs to see the GWT 1.6/1.7 docs.)

请注意，这样做，您不必/不必自己创建对话框.

Note that doing it this way, you don't have to/don't get to create the dialog box yourself.

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