ServiceWorkerRegistration.showNotification()

The showNotification() method of the ServiceWorkerRegistration interface creates a notification on an active service worker.

Syntax

​ServiceWorkerRegistration.showNotification(title, [options]).then(function(NotificationEvent) { ... });

Returns

A Promise that resolves to a NotificationEvent.

Parameters

title

The title that must be shown within the notification

options Optional

An object that allows to configure the notification. It can have the following properties:

• actions: An array of actions to display in the notification. The members of the array should be an object literal. It may contain the following values:
  • action: A DOMString identifying a user action to be displayed on the notification.
  • title: A DOMString containing action text to be shown to the user.
  • icon: A USVString containg the URL of an icon to display with the action.
  Appropriate responses are built using event.action within the notificationclick event.
• badge: The URL of an image to represent the notification when there is not enough space to display the notification itself such as, for example, the Android Notification Bar. On Android devices, the badge should accommodate devices up to 4x resolution, about 96 by 96 px, and the image will be automatically masked.
• body: A string representing an extra content to display within the notification.
• dir : The direction of the notification; it can be auto, ltr, or rtl
• icon: The URL of an image to be used as an icon by the notification.
• image: a USVSTring containing the URL of an image to be displayed in the notification.
• lang: Specify the lang used within the notification. This string must be a valid BCP 47 language tag.
• renotify: A boolean that indicates whether to supress vibrations and audible alerts when resusing a tag value. The default is false.
• requireInteraction: Indicates that on devices with sufficiently large screens, a notification should remain active until the user clicks or dismisses it. If this value is absent or false, the desktop version of Chrome will auto-minimize notifications after approximately twenty seconds. The default value is false.
• tag: An ID for a given notification that allows you to find, replace, or remove the notification using script if necessary.
• vibrate: A vibration pattern to run with the display of the notification. A vibration pattern can be an array with as few as one member. The values are times in milliseconds where the even indices (0, 2, 4, etc.) indicate how long to vibrate and the odd indices indicate how long to pause. For example [300, 100, 400] would vibrate 300ms, pause 100ms, then vibrate 400ms.
• data: Arbitrary data that you want associated with the notification. This can be of any data type.

Examples

navigator.serviceWorker.register('sw.js');

function showNotification() {
  Notification.requestPermission(function(result) {
    if (result === 'granted') {
      navigator.serviceWorker.ready.then(function(registration) {
        registration.showNotification('Vibration Sample', {
          body: 'Buzz! Buzz!',
          icon: '../images/touch/chrome-touch-icon-192x192.png',
          vibrate: [200, 100, 200, 100, 200, 100, 200],
          tag: 'vibration-sample'
        });
      });
    }
  });
}

To invoke the above function at an appropriate time, you could use the ServiceWorkerGlobalScope.onnotificationclick event handler.

You can also retrieve details of the Notifications have have been fired from the current service worker using ServiceWorkerRegistration.getNotifications().

Specifications

Browser compatibility

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