files/en-us/web/api/wakelocksentinel/release_event/index.md
{{APIRef("Screen Wake Lock API")}}{{SecureContext_Header}}
The release event of the {{domxref("WakeLockSentinel")}} interface is fired when the sentinel object's handle has been released.
A {{domxref("WakeLockSentinel")}} can be released manually via the release() method, or automatically via the platform wake lock.
This can happen if the document becomes inactive or looses visibility, if the device is low on power or the user turns on a power save mode.
Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.
addEventListener("release", (event) => { })
onrelease = (event) => { }
A generic {{domxref("Event")}}.
This example updates the UI if the wake lock is released.
wakeLock.addEventListener("release", () => {
// if wake lock is released alter the UI accordingly
statusElement.textContent = "Wake Lock has been released";
});
{{Specifications}}
{{Compat}}