BackgroundFetchEvent

Limited availability

This feature is not Baseline because it does not work in some of the most widely-used browsers.

Experimental: This is an experimental technology
Check the Browser compatibility table carefully before using this in production.

Note: This feature is only available in Service Workers.

The BackgroundFetchEvent interface of the Background Fetch API is the event type for background fetch events dispatched on the service worker global scope.

It is the event type passed to backgroundfetchclick event and backgroundfetchabort event.

Event ExtendableEvent BackgroundFetchEvent

Constructor

BackgroundFetchEvent() Experimental

Creates a new BackgroundFetchEvent object. This constructor is not typically used, as the browser creates these objects itself and provides them to background fetch event callbacks.

Instance properties

Also inherits properties from its parent, ExtendableEvent.

BackgroundFetchEvent.registration Read only Experimental

Returns the BackgroundFetchRegistration that the event was initialized to.

Instance methods

Also inherits methods from its parent, ExtendableEvent.

None.

Examples

In this example, if the user clicks on the user interface displaying the download progress, a new window will open. The current BackgroundFetchRegistration is returned by calling event.registration.

js
addEventListener("backgroundfetchclick", (event) => {
  const bgFetch = event.registration;

  if (bgFetch.result === "success") {
    clients.openWindow("/latest-podcasts");
  } else {
    clients.openWindow("/download-progress");
  }
});

Specifications

Specification
Background Fetch
# background-fetch-event

Browser compatibility

Report problems with this compatibility data on GitHub
desktopmobile
Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
WebView on iOS
BackgroundFetchEvent
Experimental
BackgroundFetchEvent() constructor
Experimental
registration
Experimental

Legend

Tip: you can click/tap on a cell for more information.

Full support
Full support
No support
No support
Experimental. Expect behavior to change in the future.