PushManager.getSubscription()

The PushManager.getSubscription() method of the PushManager interface retrieves an existing push subscription.

It returns a Promise that resolves to a PushSubscription object containing details of an existing subscription. If no existing subscription exists, this resolves to a null value.

Syntax

​PushManager.getSubscription().then(function(pushSubscription) { ... } );

Parameters

None.

Returns

A Promise that resolves to a PushSubscription object.

Example

This code snippet is taken from a push messaging and notification sample. (No live demo is available.)

// We need the service worker registration to check for a subscription
  navigator.serviceWorker.ready.then(function(serviceWorkerRegistration) {
    // Do we already have a push message subscription?
    serviceWorkerRegistration.pushManager.getSubscription()
      .then(function(subscription) {
        // Enable any UI which subscribes / unsubscribes from
        // push messages.
        var pushButton = document.querySelector('.js-push-button');
        pushButton.disabled = false;
        if (!subscription) {
          // We aren’t subscribed to push, so set UI
          // to allow the user to enable push
          return;
        }
        // Keep your server in sync with the latest subscriptionId
        sendSubscriptionToServer(subscription);
        showCurlCommand(subscription);
        // Set your UI to show they have subscribed for
        // push messages
        pushButton.textContent = 'Disable Push Messages';
        isPushEnabled = true;
      })
      .catch(function(err) {
        window.Demo.debug.log('Error during getSubscription()', err);
      });
  });
}

Specifications

Browser compatibility

• [1] Push (and Service Workers) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)
• [2] Push has been enabled by default on Firefox for Android version 48.