Keyboard: lock() 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.
Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.
The lock() method of the
Keyboard interface returns a Promise that resolves after enabling the
capture of key presses for any or all of the keys on the physical keyboard. This method
can only capture keys that are granted access by the underlying operating
system.
If lock() is called multiple times then only the key codes specified in the most recent call will be locked.
Any keys locked by a previous call to lock() are unlocked.
Syntax
lock()
lock(keyCodes)
Parameters
keyCodesOptional-
An
Arrayof one or more key codes to lock. If no keycodes are provided all keys will be locked. A list of valid code values is found in the UI Events KeyboardEvent code Values spec.
Return value
A Promise that resolves with undefined when the lock was successful.
Exceptions
AbortErrorDOMException-
Thrown if a new call to
lock()is made before the current one has finished. InvalidAccessErrorDOMException-
Thrown if any key in
keyCodesis not a valid key code attribute value. InvalidStateErrorDOMException-
Thrown if
lock()is not called in an active top-level browsing context.
Security
Transient user activation is required. The user has to interact with the page or a UI element in order for this feature to work.
Examples
Capturing all keys
The following example captures all key presses.
navigator.keyboard.lock();
Capturing specific keys
The following example captures the "W", "A", "S", and "D" keys. It captures these keys
regardless of which modifiers are used with the key press. Assuming a standard US QWERTY
layout, registering "KeyW" ensures that "W", Shift+"W", Control+"W",
Control+Shift+"W", and all other key modifier combinations with "W" are sent to the app.
The same applies to for "KeyA", "KeyS" and
"KeyD".
navigator.keyboard.lock(["KeyW", "KeyA", "KeyS", "KeyD"]);
Specifications
| Specification |
|---|
| Keyboard Lock # h-keyboard-lock |
Browser compatibility
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