TouchEvent: altKey property

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

The read-only altKey property of the TouchEvent interface returns 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.

Value

A boolean value that is true if the alt key is enabled for this event; and false if the alt is not enabled.

Examples

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.

js
someElement.addEventListener(
  "touchstart",
  (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,
);

Specifications

Specification
Touch Events
# dom-touchevent-altkey

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
altKey

Legend

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Full support
Full support
No support
No support
Has more compatibility info.