event.altKey property

The event.altKey property lets you know if the Alt key was pressed during the event.

Syntax

event.altKey;

Example

In the following example, when a button is clicked, we will display a message indicating whether one of the Ctrl, Alt or Shift keys was pressed:

<button id="button">click me</button>

let button = document.querySelector('#button');

button.addEventListener('click', function(event) {
	if (event.ctrlKey) {
		alert('Ctrl pressed');
	}
	
	if (event.altKey) {
		alert('Alt pressed');
	}
	
	if (event.shiftKey) {
		alert('Shift pressed');
	}
});

event.altKey property

Syntax

Example

See also