The KeyboardEvent.altKey
read-only property is a Boolean
that indicates if the alt key (Option or ⌥ on OS X) was pressed (true
) or not (false
) when the event occured.
Syntax
var altKeyPressed = instanceOfKeyboardEvent.altKey
Return value
Examples
<html> <head> <title>altKey example</title> <script type="text/javascript"> function showChar(e){ alert( "Key KeyDown: " + String.fromCharCode(e.charCode) + "\n" + "charCode: " + e.charCode + "\n" + "ALT key KeyDown: " + e.altKey + "\n" ); } </script> </head> <body onkeydown="showChar(event);"> <p> Press any character key, with or without holding down the ALT key.<br /> You can also use the SHIFT key together with the ALT key. </p> </body> </html>
Specifications
Specification | Status | Comment |
---|---|---|
Document Object Model (DOM) Level 3 Events Specification The definition of 'KeyboardEvent.altkey' in that specification. |
Obsolete | Initial definition. |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
altKey | Chrome Full support Yes | Edge Full support 12 | Firefox Full support Yes | IE Full support Yes | Opera Full support Yes | Safari Full support Yes | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support Yes | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support