尝试获取ENTER键的字符代码 [英] Trying to get the char code of ENTER key

问题描述

  newSymbolTextBox.addKeyPressHandler（new KeyPressHandler（）{
 public void onKeyPress（ KeyPressEvent事件）{
 System.out.println（foo =+ KeyCodes.KEY_ENTER）; 
 System.out.println（bar =+ event.getCharCode（））; 
 } 
}）; 
  

当我按下ENTER时，我得到这个输出：

  foo = 13 
 bar = 
  

我期望 bar = 后的值。任何想法？

解决方案

实际上，价值就在那里。你没有看到任何东西的原因是因为该字符是回车符。我相信回车，只是移动下一行（你可以谷歌它的确切功能）。如果你的谷歌ascii表，你会发现你从 KeyCodes.KEY_ENTER 得到的13对应于CR，即回车符。

I have this this code:

newSymbolTextBox.addKeyPressHandler(new KeyPressHandler() {
  public void onKeyPress(KeyPressEvent event) {
      System.out.println("foo =" + KeyCodes.KEY_ENTER);
  System.out.println("bar =" + event.getCharCode());
  }
});

When I press ENTER I get this output:

foo =13
bar =

I expected a value after bar =. Any idea?

解决方案

The value is, in fact, there. The reason you don't see anything is because the character is a carriage return. The carriage return, I believe, just moves the next line (you can google it's exact function). If you google "ascii table" you will see that the 13 you get from KeyCodes.KEY_ENTER corresponds with CR, the carriage return character.

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