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A Boolean value indicating whether or not the alt (Alternate) key is enabled when the touch event is created. If the alt key is enabled, the attribute's value is true. Otherwise, it is false.

This property is Read only .


var altEnabled = touchEvent.altKey;

Return value

true if the alt key is enabled for this event; and false if the alt is not enabled.


This example illustrates how to access the TouchEvent key modifier properties: TouchEvent.altKey, TouchEvent.ctrlKey, TouchEvent.metaKey and TouchEvent.shiftKey.

In following code snippet, the touchstart event handler logs the state of the event's modifier keys.

someElement.addEventListener('touchstart', function(e) {
   // Log the state of this event's modifier keys
   console.log("altKey = " + e.altKey);
   console.log("ctrlKey = " + e.ctrlKey);
   console.log("metaKey = " + e.metaKey);
   console.log("shiftKey = " + e.shiftKey);
}, false);


Specification Status Comment
Touch Events – Level 2 Editor's Draft Non-stable version.
Touch Events Recommendation Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support 22.0 18.0 (18.0) No support No support No support
Feature Android Android Webview Chrome for Android Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile
Basic support (Yes) (Yes) (Yes) 6.0 (6.0) (Yes) 11 (Yes) (Yes)

Document Tags and Contributors

 Contributors to this page: rolfedh, AFBarstow
 Last updated by: rolfedh,