确定“退格”按钮按下 [英] Determine "Backspace" button pressing

问题描述

如何在GWT中确定用户按下了 Backspace 按钮？我尝试了这一点，但它不起作用

  @Override 
 public void onKeyPress（KeyPressEvent event）{
 char charCode = event.getCharCode（）; 
 if（charCode ==（char）KeyCodes.KEY_BACKSPACE）{
 // do someThing 
} 
} 
  

解决方案

在大多数浏览器中， keypress 会产生角色（这就是它的标准化方式： http://www.w3.org/TR/DOM-Level-3-Events/#event-type-keypress ）。退格显然不会产生一个字符;你应该使用 keydown 或 keyup 来检测它。

How to determine in GWT that user pressed Backspace button? I tried this, but it does not work

  @Override
  public void onKeyPress(KeyPressEvent event) {
       char charCode= event.getCharCode();
       if(charCode == (char) KeyCodes.KEY_BACKSPACE){
           //do someThing 
       }
  }

解决方案

The keypress event is implemented in most browsers as only firing when a character would be produced (and that's how it's being standardized: http://www.w3.org/TR/DOM-Level-3-Events/#event-type-keypress ). Backspace obviously doesn't produce a character; you should use keydown or keyup to detect it.

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