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

The Lock interface of the the Web Locks API provides the name and mode of a previously requested lock, which is received in the callback to LockManager.request().

Properties

Lock.mode Read only
Returns the access mode passed to LockManager.request() when the lock was requested. The mode is either "exclusive" (the default) or "shared".
Lock.name Read only
Returns the name passed to LockManager.request() when the lock was requested.

Examples

The following examples show how the mode and name properties are passed in the call to LockManager.request(). LockManager is the object returned by navigator.locks.

navigator.locks.request("net_db_sync", show_lock_properties);
navigator.locks.request("another_lock", {mode: "shared"}, show_lock_properties);

function show_lock_properties(lock) {
  console.log(`The lock name is: ${lock.name}`);
  console.log(`The lock mode is: ${lock.mode}`);
}

Specifications

Specification Status Comment
Web Locks API
The definition of 'Lock' in that specification.
Draft Initial definition.

Browser compatibility

Update compatibility data on GitHub
DesktopMobile
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidFirefox for AndroidOpera for AndroidSafari on iOSSamsung Internet
Lock
Experimental
Chrome Full support 69Edge Full support ≤79Firefox ? IE No support NoOpera Full support 56Safari ? WebView Android Full support 69Chrome Android Full support 69Firefox Android ? Opera Android Full support 48Safari iOS ? Samsung Internet Android Full support 10.0
mode
Experimental
Chrome Full support 69Edge Full support ≤79Firefox ? IE No support NoOpera Full support 56Safari ? WebView Android Full support 69Chrome Android Full support 69Firefox Android ? Opera Android Full support 48Safari iOS ? Samsung Internet Android Full support 10.0
name
Experimental
Chrome Full support 69Edge Full support ≤79Firefox ? IE No support NoOpera Full support 56Safari ? WebView Android Full support 69Chrome Android Full support 69Firefox Android ? Opera Android Full support 48Safari 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.

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