KeyboardLayoutMap: has() method

Limited availability

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

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

The has() method of the KeyboardLayoutMap interface returns a boolean indicating whether the object has an element with the specified key.

A list of valid keys is found in the UI Events KeyboardEvent code Values spec.

The method is otherwise the same as Map.prototype.has().

Syntax

js
has(key)

Parameters

key

The key of an element to search for in the map.

Return value

A Boolean indicating whether the specified key was found.

Examples

The following example checks whether the location- or layout-specific string associated with the keyboard code that corresponds to the 'W' key on an English QWERTY keyboard exists.

js
navigator.keyboard.getLayoutMap().then((keyboardLayoutMap) => {
  console.log(keyboardLayoutMap.has("KeyW"));
});

Specifications

Specification
ECMAScript® 2025 Language Specification
# sec-map.prototype.has

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
has
Experimental

Legend

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Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.

See also