gwt - gwt点击事件文档

Question

我需要向文档注册一个跨平台和版本无关的单击事件。
这意味着我有两个文本框和提交按钮，但是当我在两个文本框之外单击并提交按钮时，
将显示警报。我如何通过gwt实现此功能

document.get()。addMouseClick ???

Answer 1

我想到的最简单的方法是将所有内容包装在 FocusPanel 中:

ClickHandler clickHandler = new ClickHandler() {
        @Override
        public void onClick(ClickEvent event) {
            Window.alert("TextBox/Button clickHandler.");
            event.stopPropagation(); // The important line - We stop the event
                                     // propagation here so that the FocusPanel
                                     //  doesn't get the event
        }
    };
TextBox textBox = new TextBox();
textBox.addClickHandler(clickHandler);
Button button = new Button("Test");
button.addClickHandler(clickHandler);


// Since FocusPanel is a SimplePanel, it can only have one child, so we are
// wrapping everything additionally in a HorizontalPanel
HorizontalPanel hPanel = new HorizontalPanel();
hPanel.add(textBox);
hPanel.add(button);


FocusPanel focusPanel = new FocusPanel(hPanel);
focusPanel.addClickHandler(new ClickHandler() {
    @Override
    public void onClick(ClickEvent event) {
        Window.alert("Outside."); // Clicked outside of the TextBox/Button
    }
});

RootPanel.get().add(focusPanel);    

缺点是，您需要为不需要警报的每个元素分配ClickHandler(可以使用相同的ClickHandler来节省内存，就像我上面所做的那样)。除此之外， FocusPanel 实现应确保onclick行为保持跨浏览器。