從字符串獲取keyCode？

Question

在as3中使用靜態方法，我可以從字符串中的字符獲得charCode。

如何從字符串中的字符獲取keyCode？我是否需要通過JavaScript運行此功能（如果我可以在Javascript中執行此操作...）

Answer 1

複製和粘貼爲 「KeyCodeUtil.as」，把它放在文件夾下：網/ onthewings/utils的

/* 
    KeyCodeUtil.as 

    Andy Li (andy@onthewings.net) 
    2009-11-02 
*/ 

package net.onthewings.utils { 
    import flash.ui.Keyboard; 


    public class KeyCodeUtil { 
     /* 
      The below codes is used for generating KEYCODES. Some formating is needed to be done by hand after getting the outputStr. 

      var outputStr:String = ""; 
      function onPress(evt:KeyboardEvent):void { 
       outputStr += "'" + evt.charCode + "':" + evt.keyCode + ", //"+String.fromCharCode(evt.charCode)+"\n"; 
      } 
     */ 
     static public const KEYCODES:Object = { 
       27: 27,  //esc 
       96: 192, //` 
       49: 49,  //1 
       50: 50,  //2 
       51: 51,  //3 
       52: 52,  //4 
       53: 53,  //5 
       54: 54,  //6 
       55: 55,  //7 
       56: 56,  //8 
       57: 57,  //9 
       48: 48,  //0 
       45: 189, //- 
       61: 187, //= 
       8: 8,  //backspace 
       9: 9,  //tab 
       113: 81, //q 
       119: 87, //w 
       101: 69, //e 
       114: 82, //r 
       116: 84, //t 
       121: 89, //y 
       117: 85, //u 
       105: 73, //i 
       111: 79, //o 
       112: 80, //p 
       91: 219, //[ 
       93: 221, //] 
       92: 220, //\ 
       97: 65,  //a 
       115: 83, //s 
       100: 68, //d 
       102: 70, //f 
       103: 71, //g 
       104: 72, //h 
       106: 74, //j 
       107: 75, //k 
       108: 76, //l 
       59: 186, //; 
       39: 222, //' 
       13: 13,  //enter 
       122: 90, //z 
       120: 88, //x 
       99: 67,  //c 
       118: 86, //v 
       98: 66,  //b 
       110: 78, //n 
       109: 77, //m 
       44: 188, //, 
       46: 190, //. 
       47: 191, /// 
       32: 32,  //space 
       127: 46, //delete 
       126: 192, //~ 
       33: 49,  //! 
       64: 50,  //@ 
       35: 51,  //# 
       36: 52,  //$ 
       37: 53,  //% 
       94: 54,  //^ 
       38: 55,  //& 
       42: 56,  //* 
       40: 57,  //(
       41: 48,  //) 
       95: 189, //_ 
       43: 187, //+ 
       81: 81,  //Q 
       87: 87,  //W 
       69: 69,  //E 
       82: 82,  //R 
       84: 84,  //T 
       89: 89,  //Y 
       85: 85,  //U 
       73: 73,  //I 
       79: 79,  //O 
       80: 80,  //P 
       123: 219, //{ 
       125: 221, //} 
       124: 220, //| 
       65: 65,  //A 
       83: 83,  //S 
       68: 68,  //D 
       70: 70,  //F 
       71: 71,  //G 
       72: 72,  //H 
       74: 74,  //J 
       75: 75,  //K 
       76: 76,  //L 
       58: 186, //: 
       34: 222, //" 
       90: 90,  //Z 
       88: 88,  //X 
       67: 67,  //C 
       86: 86,  //V 
       66: 66,  //B 
       78: 78,  //N 
       77: 77,  //M 
       60: 188, //< 
       62: 190, //> 
       63: 191  //? 
      } 

     /** 
     * @param char Can be String or charCode(Number). 
     * @param numpad If set to true, the function will return the keyCode for numpad. Ignored if numpad have no such key. 
     */ 
     static public function keyCodeOf(char:*, numpad:Boolean = false):Number { 
      var charCode:Number; 

      if (char is String) 
       charCode = (char as String).charCodeAt(); 
      else 
       charCode = char; 

      if (numpad){ 
       if (charCode >= 48 && charCode <= 57){ //0-9 
        return charCode + 48; 
       } else if (charCode == 43){ 
        return Keyboard.NUMPAD_ADD; 
       } else if (charCode == 46){ 
        return Keyboard.NUMPAD_DECIMAL; 
       } else if (charCode == 47){ 
        return Keyboard.NUMPAD_DIVIDE; 
       } else if (charCode == 13){ 
        return Keyboard.NUMPAD_ENTER; 
       } else if (charCode == 42){ 
        return Keyboard.NUMPAD_MULTIPLY; 
       } else if (charCode == 45){ 
        return Keyboard.NUMPAD_SUBTRACT; 
       } 
      } 

      return KEYCODES[charCode] ? KEYCODES[charCode] : -1; 
     } 

    } 
} 

Answer 2

爲什麼從字符串中獲取鍵碼？爲什麼不直接從KeyboardEvent得到它？

下面的示例代碼演示瞭如何處理和檢索KeyboardEvent鍵碼的文檔中一個精簡版：

package { 
    import flash.display.Sprite; 
    import flash.display.DisplayObject; 
    import flash.events.*; 

    public class KeyboardEventExample extends Sprite { 
     private var child:Sprite = new Sprite(); 
     private var bgColor:uint = 0x00CCFF; 
     private var size:uint = 80; 

     public function KeyboardEventExample() { 
      child.graphics.beginFill(bgColor); 
      child.graphics.drawRect(0, 0, size, size); 
      child.graphics.endFill(); 
      addChild(child); 
      child.addEventListener(KeyboardEvent.KEY_DOWN, keyDownHandler); 
      child.addEventListener(KeyboardEvent.KEY_UP, keyUpHandler); 
     } 

     private function keyDownHandler(event:KeyboardEvent):void { 
      trace("keyDownHandler: " + event.keyCode); 
     } 

     private function keyUpHandler(event:KeyboardEvent):void { 
      trace("keyUpHandler: " + event.keyCode); 
     } 
    } 
} 

Answer 3

如果你真的有需要讀取一個字符串，聽到鍵盤不是一個選項（如Soviut所建議的那樣），那麼你將需要確保字符串被分隔一些方式，大多數情況下可能帶有逗號 - 因爲每個keyCode的字符數量不同，而某些keyCode是字符串其他人都是。

這裏是所有的鍵代碼常量列表：

http://livedocs.adobe.com/flash/9.0/ActionScriptLangRefV3/flash/ui/Keyboard.html

Answer 4

在Adobe AIR中使用此功能：

var str:String = "a"; //only one letter at a time 
var keyCode:uint = Keyboard[str.toUpperCase()]; 
trace(keyCode); 

Answer 5

我想我會加入一個很easy更高級的方法：

var str:String = "B"; 
trace(str.charCodeAt(0)); // replace 0 with the index of the char you want the code of