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.
<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
