Javascript | MouseEvent altKey Property
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.
Syntax:
event.altKey
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 :
html
<!DOCTYPE html><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> <script> function geek(event) { if (event.altKey) { alert("Alt key is pressed."); } else { alert("Alt key is not pressed."); } } </script></body></html> |
Output:
Clicking button (Alt key is not pressed):
Clicking button (Alt key is pressed):
Supported Browsers: The browser supported by mouseEvent altKey Property are listed below:
- Apple Safari
- Google Chrome
- Firefox
- Opera
- Internet Explorer
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