HTML DOM | KeyboardEvent altKey Property
The KeyboardEvent altKey property in HTML DOM is a read-only property and used to return the boolean value which indicates the alt key is pressed or not. It returns True if alt key is pressed otherwise return false.
Syntax:
event.altKey
Below program illustrates the KeyboardEvent altkey property in HTML:
Example: This example check whether the “ALT” key is pressed or not.
html
<!DOCTYPE html><html> <head> <title> HTML DOM KeyboardEvent altKey property </title></head><body> <h1>GeeksforGeeks</h1> <h2>KeyboardEvent altKey Property</h2> <p> Check whether the alt key is pressed or not </p> <input type="text" onkeydown="keyboard(event)"> <p id = "test"></p> <!-- script to check alt key event --> <script> function keyboard(event) { var a = document.getElementById("test"); if (event.altKey) { a.innerHTML = "The ALT key has been pressed!"; } else { a.innerHTML = "The ALT key has not been pressed!"; } } </script></body></html> |
Output:
Before Press the Key:
After Press the key:
Supported Browsers: The browser supported by KeyboardEvent altKey property are listed below:
- Opera 12.1
- Internet Explorer 9
- Google Chrome 1
- Edge 12
- Firefox 1.5
- Apple Safari 1.2
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