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JavaScript MouseEvent altKey Property

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The mouseEvent altKey property is used to define whether the alt key is pressed or not. It is a boolean value. When the alt key is pressed then on click of the mouse buttons it returns true and if it is not pressed then it returns false. 

Syntax: 

event.altKey

Return Value: It returns a boolean value indicating whether the alt key is pressed or not.

  • true: it indicates the alt key is pressed
  • false: it indicates the alt key is not pressed

Example: In this example, we will see the example of MouseEvent altKey property.

html




<body style="text-align:center;">
  
    <h1 style="color:green;">
        GeeksforGeeks
    </h1>
  
    <h2>
        mouseEvent altKey Property
    </h2>
  
    <button onclick="geek (event);">Get Alt key state!</button>
    <p id="gfg"></p>
    <script>
        function geek(event) {
            if (event.altKey) {
                document.getElementById("gfg")
                        .innerHTML = "Alt key is pressed.";
            } else {
                document.getElementById("gfg")
                        .innerHTML ="Alt key is not pressed.";
            }
        }
    </script>
</body>

Output: 

 

Supported Browsers: The browser supported by  mouseEvent altKey Property are listed below: 

  • Apple Safari
  • Google Chrome
  • Firefox
  • Opera
  • Internet Explorer
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Last Updated : 08 Feb, 2023
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