KeyboardEvent altKey Property

DOM Events KeyboardEvent

Definition and Usage

The altKey property returns a boolean value indicating whether the "ALT" key was pressed during a keyboard or mouse event.

Note:On some Mac keyboards, the "ALT" key is displayed as "Option" or "Opt".

Note:This property is read-only.

Example

Determine if the "ALT" key is pressed when a keyboard key is clicked:

var x = document.getElementById("demo");
if (event.altKey) {
  x.innerHTML = "The ALT key was pressed!";
}
  x.innerHTML = "The ALT key was NOT pressed!";
}

Try It Yourself

Syntax

event.altKey

Technical Details

Return value:

A boolean value indicating whether the "ALT" key was pressed during the keyboard event.

Possible values:

  • true - Alt key pressed
  • false - Alt key not pressed
DOM Version: DOM Level 2 Events

Browser Support

Properties Chrome IE Firefox Safari Opera
altKey Support Support Support Support Support

Related Pages

HTML DOM Reference Manual:KeyboardEvent ctrlKey Property

HTML DOM Reference Manual:KeyboardEvent metaKey Property

HTML DOM Reference Manual:KeyboardEvent shiftKey Property

DOM Events KeyboardEvent