The updateUI()
method of the BackgroundFetchUpdateUIEvent
interface updates the title and icon in the user interface to show the status of a background fetch.
This method may only be run once, to notify the user on a failed or a successful fetch.
The following example demonstrates updating the UI with a title and image icon on a successful fetch.
addEventListener('backgroundfetchsuccess', (event) => {
event.updateUI({ title: 'Episode 5 ready to listen!', 'icon: {
src: "path/to/success.ico",
sizes: "16x16 32x32 64x64",
}' });
}());
});