ServiceWorkerRegistration: showNotification() method

{{APIRef("Web Notifications")}} {{SecureContext_Header}}  {{AvailableInWorkers}} 

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

Syntax

showNotification(title)
showNotification(title, options)

Parameters

• title
  • : Defines a title for the notification, which is shown at the top of the notification window.
• options {{optional_inline}} 
  • : An options object containing any custom settings that you want to apply to the notification. The possible options are:

    • actions {{optional_inline}}  {{experimental_inline}} 

      • : An array of actions to display in the notification, for which the default is an empty array. Each element in the array can be an object with the following members:

        • action
          • : A string identifying a user action to be displayed on the notification.
        • title
          • : A string containing action text to be shown to the user.
        • icon {{optional_inline}} 
          • : A string containing the URL of an icon to display with the action.

        Appropriate responses are built using event.action within the {{domxref("ServiceWorkerGlobalScope.notificationclick_event", "notificationclick")}}  event.

    • badge {{optional_inline}}  {{experimental_inline}} 

      • : A string containing the URL of the image used to represent the notification when there isn’t enough space to display the notification itself; for example, the Android Notification Bar. On Android devices, the badge should accommodate devices up to 4x resolution, about 96x96px, and the image will be automatically masked.

    • body {{optional_inline}} 

      • : A string representing the body text of the notification, which is displayed below the title. The default is the empty string.

    • data {{optional_inline}}  {{experimental_inline}} 

      • : Arbitrary data that you want associated with the notification. This can be of any structured-clonable data type. The default is null.

    • dir {{optional_inline}} 

      • : The direction in which to display the notification. It defaults to auto, which just adopts the browser’s language setting behavior, but you can override that behavior by setting values of ltr and rtl (although most browsers seem to ignore these settings.)

    • icon {{optional_inline}} 

      • : A string containing the URL of an icon to be displayed in the notification.

    • image {{optional_inline}}  {{experimental_inline}} 

      • : A string containing the URL of an image to be displayed in the notification.

    • lang {{optional_inline}} 

      • : The notification’s language, as specified using a string representing a {{glossary("BCP 47 language tag")}} . The default is the empty string.

    • renotify {{optional_inline}}  {{experimental_inline}} 

      • : A boolean value specifying whether the user should be notified after a new notification replaces an old one. The default is false, which means they won’t be notified. If true, then tag also must be set.

    • requireInteraction {{optional_inline}}  {{experimental_inline}} 

      • : Indicates that a notification should remain active until the user clicks or dismisses it, rather than closing automatically. The default value is false.

    • silent {{optional_inline}} 

      • : A boolean value specifying whether the notification is silent (no sounds or vibrations issued), regardless of the device settings. The default, null, means to respect device defaults. If true, then vibrate must not be present.

    • tag {{optional_inline}} 

      • : A string representing an identifying tag for the notification. The default is the empty string.

    • timestamp {{optional_inline}} 

      • : A timestamp, given as {{glossary("Unix time")}}  in milliseconds, representing the time associated with the notification. This could be in the past when a notification is used for a message that couldn’t immediately be delivered because the device was offline, or in the future for a meeting that is about to start.

    • vibrate {{optional_inline}}  {{experimental_inline}} 

      • : A vibration pattern for the device’s vibration hardware to emit with the notification. If specified, silent must not be true.

Return value

A {{jsxref('Promise')}}  that resolves to undefined.

Exceptions

• {{jsxref("TypeError")}} 
  • : Thrown if:
    • The current service worker’s state is not activating or activated.
    • The user has explicitly denied the browser’s permission request to use the API.
    • The silent option is true and the vibrate option is specified.
    • The renotify option is true but the tag option is empty.
• DataCloneError {{domxref("DOMException")}} 
  • : Thrown if serializing the data option failed for some reason.

Examples

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

function showNotification() {
  Notification.requestPermission().then((result) => {
    if (result === "granted") {
      navigator.serviceWorker.ready.then((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 listen to the {{domxref("ServiceWorkerGlobalScope.notificationclick_event", "notificationclick")}}  event.

You can also retrieve details of the {{domxref("Notification")}} s that have been fired from the current service worker using {{domxref("ServiceWorkerRegistration.getNotifications()")}} .

Specifications

{{Specifications}} 

Browser compatibility

{{Compat}}