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Javascript | MouseEvent altKey Property
  • Last Updated : 07 Jan, 2019

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



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

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

Example :

<!DOCTYPE html>
        <title>JavaScript Mouse Event</title>
    <body style = "text-align:center;">
        <h1 style = "color:green;">
            mouseEvent shiftKey Property
        <button onclick="geek (event);">Get Alt key state!</button>        
        function geek (event) {
            if (event.altKey) {
                alert ("Alt key is pressed.");
            else {
                alert ("Alt key is not pressed.");

Clicking button (Alt key is not pressed):
Clicking button (Alt key is pressed):

Supported Browsers: The browser supported by altkey property are listed below:

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


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