PeriodicSyncManager - Web APIs 编辑

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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.

Properties

None.

Methods

PeriodicSyncManager.register

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

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

PeriodicSyncManager.unregister

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('fetch-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

BCD tables only load in the browser

See also

• Richer offline experiences with the Periodic Background Sync API
• A Periodic Background Sync demo app