This feature is not on a current W3C standards track, but it is supported on the Firefox OS platform. Although implementations may change in the future and it is not supported widely across browsers, it is suitable for use in code dedicated to Firefox OS apps.

This Navigator.requestWakeLock() method of the Wake Lock API is used to request a MozWakeLock on any resource of the device. This means that you can prevent that resource from becoming unavailable as long as your app holds a lock for that resource. For example, a voice recording app can obtain a lock to keep the screen on during recording so that it can give prover visual feedback to the user that recording is progressing.

Note: When the window that requested one or more wake locks is closed or destroyed, any wake locks it acquired are implicitly released; no manual release is necessary.


lock = window.navigator.requestWakeLock(resourceName);


A string representing the name of the resource to lock. Gaia uses four basic resources names: screen, cpuwifi, and gps, but any certified application can expose new resources.

Return value

Returns a MozWakeLock object you can use to keep track of or release the lock..


W3C tracks Wake Lock: Use cases and is working on the specification of the Wake Lock API.

See also


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Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.

API Firefox OS Method Non-standard Reference Wake Lock API