Web/API/LockManager/query

This is an experimental technologyCheck the Browser compatibility table carefully before using this in production.

The query() method of the LockManager interface returns a Promise which resolves with an object containing information about held and pending locks.

Syntax

var promise<LockManagerSnapshot> = LockManager.query()

Parameters

None.

Return value

A Promise that resolves with a LockManagerSnapshot containing the following properties.

• held: An array of Lock objects for held locks.
• pending: An array of Lock objects for pending lock requests.

Example

const state = await navigator.locks.query();
for (const lock of state.held) {
  console.log(`held lock: name ${lock.name}, mode ${lock.mode}`);
}
for (const request of state.pending) {
  console.log(`requested lock: name ${request.name}, mode ${request.mode}`);
}

Specifications

Specification	Status	Comment
Web Locks APIThe definition of 'query()' in that specification.	Draft	Initial definition.

Browser compatibility

The compatibility table in this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
query Experimental'	Chrome Full support 69	Edge Full support ≤79	Firefox ?	IE No support No	Opera Full support 56	Safari ?	WebView Android Full support 69	Chrome Android Full support 69	Firefox Android ?	Opera Android Full support 48	Safari iOS ?	Samsung Internet Android Full support 10.0

Legend

Full support  

Full support

No support  

No support

Compatibility unknown  

Compatibility unknown

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

LockManager.query() by Mozilla Contributors is licensed under CC-BY-SA 2.5.