• index.js

  • Register a Service Worker.

    navigator.serviceWorker.register('service-worker.js');
    
    navigator.serviceWorker.ready
    .then(function(registration) {
  • Use the PushManager to get the user’s subscription to the push service.

      return registration.pushManager.getSubscription()
      .then(async function(subscription) {
  • If a subscription was found, return it.

        if (subscription) {
          return subscription;
        }
  • Get the server’s public key

        const response = await fetch('./vapidPublicKey');
        const vapidPublicKey = await response.text();
  • Chrome doesn’t accept the base64-encoded (string) vapidPublicKey yet urlBase64ToUint8Array() is defined in /tools.js

        const convertedVapidKey = urlBase64ToUint8Array(vapidPublicKey);
  • Otherwise, subscribe the user (userVisibleOnly allows to specify that we don’t plan to send notifications that don’t have a visible effect for the user).

        return registration.pushManager.subscribe({
          userVisibleOnly: true,
          applicationServerKey: convertedVapidKey
        });
      });
    }).then(function(subscription) {
  • Send the subscription details to the server using the Fetch API.

      fetch('./register', {
        method: 'post',
        headers: {
          'Content-type': 'application/json'
        },
        body: JSON.stringify({
          subscription: subscription
        }),
      });
    
      document.getElementById('doIt').onclick = function() {
        const delay = document.getElementById('notification-delay').value;
  • Ask the server to send the client a notification (for testing purposes, in actual applications the push notification is likely going to be generated by some event in the server).

        fetch('./sendNotification', {
          method: 'post',
          headers: {
            'Content-type': 'application/json'
          },
          body: JSON.stringify({
            subscription: subscription,
            delay: delay,
          }),
        });
      };
    
    });

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