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HTML | DOM KeyboardEvent keyCode Property

  • Last Updated : 14 Feb, 2019

The KeyboardEvent keyCode property is used for returning the Unicode character code of the key that has been used to trigger an onkeypress event.
The KeyboardEvent keyCode property is also used for returning the Unicode character code of a key that has triggered an onkeydown or onkeyup event.
The key codes represent an actual key on the keyboard whereas character codes represent an ASCII character.
Upper case and lower case characters have different codes.

Syntax

event.keyCode

Below program illustrates the KeyboardEvent keyCode Property :
Example-1: Getting the Unicode value of a pressed keyboard key.




<!DOCTYPE html>
<html>
  
<head>
    <title>KeyboardEvent keyCode Property in HTML
  </title>
    <style>
        div {
            border: 3px solid green;
            height: 100px;
            width: 500px;
        }
          
        h1 {
            color: green;
        }
          
        h2 {
            font-family: Impact;
        }
          
        body {
            text-align: center;
        }
    </style>
</head>
  
<body>
  
    <h1>GeeksforGeeks</h1>
    <h2>KeyboardEvent keyCode Property</h2>
  
    <p>To return the keycode of a key, 
      insert some character in the field.</p>
  
    <input type="text"
           size="20" 
           onkeypress="keyboard(event)">
  
    <p id="test"></p>
  
    <script>
        function keyboard(event) {
            
            
            //  Return key code.
            var k = event.which || event.keyCode;
            document.getElementById("test").innerHTML = 
              "The keycode value of the pressed key is : " + k;
        }
    </script>
  
</body>
  
</html>

Output:

Before pressing a button:



After pressing a button:

Supported Browsers:

  • Opera
  • Internet Explorer
  • Google Chrome
  • Firefox
  • Apple Safari

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