PeriodicSyncManager

The PeriodicSyncManager interface of the Web Periodic Background Synchronization API provides a way to register tasks to be run in a service worker at periodic intervals with network connectivity. These tasks are referred to as periodic background sync requests. Access PeriodicSyncManager through the ServiceWorkerRegistration.periodicSync.

Instance properties

None.

Instance methods

PeriodicSyncManager.register() Experimental

Registers a periodic sync request with the browser with the specified tag and options. Returns a Promise that resolves when the registration completes.

PeriodicSyncManager.getTags() Experimental

Returns a Promise that resolves with a list of strings representing the tags that are currently registered for periodic syncing.

PeriodicSyncManager.unregister() Experimental

Unregisters the periodic sync request corresponding to the specified tag and returns a Promise that resolves when unregistration completes.

Examples

The following examples show how to use the interface.

Requesting a Periodic Background Sync

The following asynchronous function registers a periodic background sync at a minimum interval of one day from a browsing context:

async function registerPeriodicNewsCheck() {
  const registration = await navigator.serviceWorker.ready;
  try {
    await registration.periodicSync.register("get-latest-news", {
      minInterval: 24 * 60 * 60 * 1000,
    });
  } catch {
    console.log("Periodic Sync could not be registered!");
  }
}

Verifying a Background Periodic Sync by Tag

This code checks to see if a Periodic Background Sync task with a given tag is registered.

navigator.serviceWorker.ready.then((registration) => {
  registration.periodicSync.getTags().then((tags) => {
    if (tags.includes("get-latest-news")) skipDownloadingLatestNewsOnPageLoad();
  });
});

Removing a Periodic Background Sync Task

The following code removes a Periodic Background Sync task to stop articles syncing in the background.

navigator.serviceWorker.ready.then((registration) => {
  registration.periodicSync.unregister("get-latest-news");
});

Specifications

Browser compatibility

See also

• Richer offline experiences with the Periodic Background Sync API