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
optionsOptional-
An object containing any of the following:
iconsOptional-
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.
sizesOptional-
A string which is equivalent to the
sizesattribute of the<link>element. typeOptional-
A string containing an image MIME type.
labelOptional-
A string providing a name for the associated image.
titleOptional-
A string containing the new title of the user interface.
Return value
A Promise.
Exceptions
InvalidStateErrorDOMException-
Thrown if any of the following are true:
- The
isTrustedproperty isfalse. - The
BackgroundFetchUpdateUIEventUI updated flag is already set, indicating that theupdateUI()method has already been called. - The
BackgroundFetchUpdateUIEventis 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
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