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HTML | DOM TouchEvent altKey Property

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  • Last Updated : 13 Jun, 2022

The TouchEvent altKey property is a read-only property and used for returning a Boolean value which indicates whether or not the “ALT” key was pressed when a touch event was triggered. The TouchEvent altKey property mostly returns false because generally, touch devices do not have an alt key. 

Syntax :

event.altKey

Return Value: It returns true if the alt key is pressed, else it returns false. 

Below program illustrates the TouchEvent altKey property : 

Example: Finding out whether the “ALT” key was pressed on the touch screen or not. 

html




<!DOCTYPE html>
<html>
<meta name="viewport"
      content="width=device-width,
               initial-scale=1">
 
<head>
    <title>TouchEvent altKey property in HTML</title>
   
    <style>
        h1 {
            color: green;
        }
         
        h2 {
            font-family: Impact;
        }
         
        body {
            text-align: center;
        }
    </style>
</head>
 
<body ontouchstart="isKeyPressed(event)">
 
    <h1>GeeksforGeeks</h1>
    <h2>TouchEvent altKey property</h2>
    <br>
 
    <p>Touch somewhere in the document and wait for
      an alert to tell if the ALT key was pressed or not.</p>
 
    <script>
        function count(event) {
           
            //  Check whether the ALT key has been pressed
            //  or not.
            if (event.altKey) {
                alert("ALT key has been pressed!");
            } else {
                alert("ALT key has not been pressed!");
            }
        }
    </script>
 
</body>
 
</html>

Output:

  • Before clicking the button: 

  • After clicking the button: 

Supported Browsers:

  • Google Chrome 22 and above
  • Edge 79 and above
  • Firefox 52 and above
  • Opera 15 and above


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