The BackgroundFetchManager
interface of the Background Fetch API is a map where the keys are background fetch IDs and the values are BackgroundFetchRegistration
objects.
The example below shows how to get an instance of BackgroundFetchManager
from a ServiceWorkerRegistration
object and calls fetch()
to download an audio file in the background.
navigator.serviceWorker.ready.then(async (swReg) => {
const bgFetch = await swReg.backgroundFetch.fetch(
"my-fetch",
["/ep-5.mp3", "ep-5-artwork.jpg"],
{
title: "Episode 5: Interesting things.",
icons: [
{
sizes: "300x300",
src: "/ep-5-icon.png",
type: "image/png",
},
],
downloadTotal: 60 * 1024 * 1024,
},
);
});