ServiceWorkerRegistration

The ServiceWorkerRegistration interface of the ServiceWorker API represents the service worker registration. You register a service worker to control one or more pages that share the same origin.

The lifetime of a service worker registration is beyond that of the ServiceWorkerRegistration objects that represent them within the lifetime of their corresponding service worker clients. The browser maintains a persistent list of active ServiceWorkerRegistration objects.

Properties

Also implements properties from its parent interface, EventTarget.

ServiceWorkerRegistration.scope Read only

Returns a unique identifier for a service worker registration. This must be on the same origin as the document that registers the ServiceWorker.

ServiceWorkerRegistration.installing Read only

Returns a service worker whose state is installing. This is initially set to null.

ServiceWorkerRegistration.waiting Read only

Returns a service worker whose state is installed. This is initially set to null.

ServiceWorkerRegistration.active Read only

Returns a service worker whose state is either activating or activated. This is initially set to null. An active worker will control a ServiceWorkerClient if the client's URL falls within the scope of the registration (the scope option set when ServiceWorkerContainer.register is first called.)

serviceWorkerRegistration.periodicSync Read only

Returns a reference to the PeriodicSyncManager interface, which manages periodic background synchronization processes.

ServiceWorkerRegistration.pushManager Read only

Returns a reference to the PushManager interface for managing push subscriptions including subscribing, getting an active subscription, and accessing push permission status.

ServiceWorkerRegistration.sync  Read only  

Returns a reference to the SyncManager interface, which manages background synchronization processes.

Event handlers

ServiceWorkerRegistration.onupdatefound Read only

An EventListener property called whenever an event of type updatefound is fired; it is fired any time the ServiceWorkerRegistration.installing property acquires a new service worker.

Methods

Also implements methods from its parent interface, EventTarget.

ServiceWorkerRegistration.getNotifications()

Returns a Promise that resolves to an array of Notification objects.

ServiceWorkerRegistration.showNotification()

Displays the notification with the requested title.

ServiceWorkerRegistration.update()

Checks the server for an updated version of the service worker without consulting caches.

ServiceWorkerRegistration.unregister()

Unregisters the service worker registration and returns a promise (see Promise). The service worker will finish any ongoing operations before it is unregistered.

Examples

This code snippet is from the service worker registration-events sample (live demo). The code checks to see if the browser supports service workers and if there's currently a service worker handling requests on this page for the current navigation.

Any new service workers are registered; if there's an existing service worker, the code overrides its default scope so that the registration applies to the current directory and everything underneath it. The example also reports any registration failures.

if ('serviceWorker' in navigator) {
  document.querySelector('#availability').innerText = 'are';
  document.querySelector('#controlled').innerText = navigator.serviceWorker.controller ? 'is' : 'is not';
  navigator.serviceWorker.register('service-worker.js', {scope: './'}).then(function(registration) {
    document.querySelector('#register').textContent = 'succeeded';
  }).catch(function(error) {
    document.querySelector('#register').textContent = 'failed: ' + error;
  });
} else {
  document.querySelector('#availability').innerText = 'are not';
}

Specifications

Browser compatibility

[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)

See also

• Using Service Workers
• Service workers basic code example
• Is ServiceWorker ready?
• Promise
• Using web workers