如何实现用户自定义的键盘快捷键(在javascript/网络上)

Question

标题说明了大部分内容。我想要一个javascript/html解决方案，介绍如何制作持久的、用户可配置的键盘快捷方式侦听器（以及如何在有偏好的情况下实际保持偏好的任何好想法）。

这看起来既简单又有点棘手：）

谢谢！

Answer 1

如果你想让用户获得像"Control"+（…）这样的快捷键，你只需要捕捉按下的键，所以检查是否在按下这些键的情况下按下了"Control"来执行操作。

这是一个简单而糟糕的例子：

var Pressed={
   CTRL:false,
   Spacebar:false
},Keyboard={ // an object containing Keyboard keys code
   CTRL:17,
   Spacebar:32
};
window.onkeydown=function(e){ // user started pressing an key (event)
   var Key=(e.keyCode||e.which||e.key); // capture key pressed from event
   if(Key==Keyboard.CTRL){ // CTRL is pressed
      Pressed.CTRL=true
      Pressed.Spacebar=false // CTRL has to be pressed before than Spacebar
   }else if(Key==Keyboard.Spacebar){ // Spacebar is pressed
      Pressed.Spacebar=true
   }
   if(Pressed.CTRL&&Pressed.Spacebar){ // Case CTRL+Spacebar are pressed
      e.preventDefault(); // prevent Opera from quitting from the page
      console.log("CTRL+Spacebar were pressed.")
   }
},
window.onkeyup=function(e){ // event when an key is released
   var Key=(e.keyCode||e.which||e.key); // capture key released from event
   if(Key==Keyboard.CTRL){ // CTRL is released
      Pressed.CTRL=false
   }else if(Key==Keyboard.Spacebar){ // Spacebar is released
      Pressed.Spacebar=false
   }
};

要更新。。。

Answer 2

您可以尝试以下操作：

出于演示目的，我刚刚记录了Alt、Ctrl或Shift+"键"，如果键在快捷方式中定义，则打印Special action else"Normal action"。此外，我还禁用了输入的关键事件传播，但如果不需要，可以删除此部分。

JSFiddle

代码

(function keyLogger() {
  var isCtrlPressed = false;
  var isAltPressed = false;
  var isShiftPressed = false;
  
  var shortcutKeys = [
    13, // Enter
    32, // Space
    37, // Left Arrow
    38, // Up Arrow
    39, // Right Arrow
    40, // Down Arrow
    90, // z
  ]
  function registerEvents() {
    document.onkeydown = function(event) {
      var keyCode = event.keyCode ? event.keyCode : event.which;
      if (keyCode >= 16 && keyCode <= 18) {
        updateKeyFlags(keyCode, true);
      }
      if (isCtrlPressed || isAltPressed || isShiftPressed) {
        if (shortcutKeys.indexOf(keyCode) >= 0) {
          console.log("Special action");
        } else {
          console.log("Normal action");
        }
      }
    }
    document.onkeyup = function(event) {
      var keyCode = event.keyCode ? event.keyCode : event.which;
      if (keyCode >= 16 && keyCode <= 18) {
        updateKeyFlags(keyCode, false);
      }
    }
    // To prevent logging from Inputs.
    // Can be removed if this action is required.
    var inputs = document.getElementsByTagName("input");
    for (var i in inputs) {
      inputs[i].onkeyup = function(event) {
        event.stopPropagation();
      }
      inputs[i].onkeydown = function(event) {
        event.stopPropagation();
      }
    }
  }
  function updateKeyFlags(keyCode, flag) {
    switch (keyCode) {
      case 16:
        isShiftPressed = flag;
        break;
      case 17:
        isCtrlPressed = flag;
        break;
      case 18:
        isAltPressed = flag;
        break;
    }
  }
  registerEvents();
})();

<div>
  <input type="text">
  <input type="text">
</div>