MouseEvent altKey Property

DOM Events MouseEvent

Definition and Usage

The altKey property returns a boolean value indicating whether the "ALT" key was pressed when the mouse event was triggered.

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 was pressed when the mouse button was clicked:

if (event.altKey) {
  alert("The ALT key was pressed!");
}
  alert("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 when the mouse event occurred.

Possible values:

  • true - alt key was pressed
  • false - alt key was 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:MouseEvent ctrlKey Property

HTML DOM Reference Manual:MouseEvent metaKey Property

HTML DOM Reference Manual:MouseEvent shiftKey Property

DOM Events MouseEvent