BackgroundFetchUpdateUIEvent: updateUI() method
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 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.
Syntax
updateUI()
updateUI(options)
Parameters
options
Optional-
An object containing any of the following:
icons
Optional-
A list of one or more image resources, containing icons for use in the user interface. An image resource is an object containing:
src
-
A string which is a URL of an image.
sizes
Optional-
A string which is equivalent to the
sizes
attribute of the<link>
element. type
Optional-
A string containing an image MIME type.
label
Optional-
A string providing a name for the associated image.
title
Optional-
A string containing the new title of the user interface.
Return value
A Promise
.
Exceptions
InvalidStateError
DOMException
-
Thrown if any of the following are true:
- The
isTrusted
property isfalse
. - The
BackgroundFetchUpdateUIEvent
UI updated flag is already set, indicating that theupdateUI()
method has already been called. - The
BackgroundFetchUpdateUIEvent
is not active.
- The
Examples
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",
},
});
});
Specifications
Specification |
---|
Background Fetch # background-fetch-update-ui-event-update-ui |
Browser compatibility
BCD tables only load in the browser