keyPressEvent.getCharCode() 为所有特殊键(如 enter、tab、escape 等)返回 0 [英] keyPressEvent.getCharCode() returning 0 for all special keys like enter, tab, escape, etc

问题描述

我的代码:

@Override
public void onKeyPress(KeyPressEvent event)
{
    if (event.getCharCode() == KeyCodes.KEY_ENTER)
    {
        registerButton.click();
    }
}

这是附加到一个文本框，当我按下回车键时它会触发.event.getCharCode() 只是零，而不是 13.当我按 tab 时，它是 0，当我按 Esc 时，它是 0.啊！

This is attached to a TextBox, and it does fire when I press enter. event.getCharCode() is just zero, not 13. When I press tab, it's 0, and when I press escape, it's 0. Argh!

昨天它运行正常，项目中的其他地方发生了变化以影响这一点 - 但我不确定它可能是什么.真的好像最后一天没有做任何相关的改变.

This was working properly yesterday, and something has changed somewhere else in the project to affect this - but I'm not sure what it could be. It really seems like no relevant changes have been made in the last day.

如果我改为处理 KeyUpEvent，这将按预期工作.

If instead I handle a KeyUpEvent, this works as expected.

我使用的是 GWT 2.1.0.感谢您的任何想法！

I'm using GWT 2.1.0. Thanks for any ideas!

推荐答案

KeyPressHandler 用于例如 SHIFT、CTRL、ALT 键.

the KeyPressHandler is used for example for the SHIFT, CTRL, ALT keys.

如果要将事件附加到另一个键，则必须使用 KeyDownHandler.

If you want to attach an event to another key you have to use KeyDownHandler.

nameField.addKeyDownHandler(new KeyDownHandler() {

    @Override
    public void onKeyDown(KeyDownEvent event) {
        if (event.getNativeKeyCode() == KeyCodes.KEY_ENTER) {
            Window.alert("hello");
        }

    }

});

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