Web/API/ExtendableEvent/ExtendableEvent

The ExtendableEvent() constructor creates a new ExtendableEvent object.

Syntax

var extendableEvent = new ExtendableEvent(type, init);

Parameters

type

The type of the ExtendableEvent, for example install, activate.

init Optional

An options object containing any custom settings that you want to apply to the event object. Currently no possible options exist inside the spec, but this has been defined for forward compatibility across the different derived events.

Specifications

Specification	Status	Comment
Service WorkersThe definition of 'ExtendableEvent' in that specification.	Working Draft	Initial definition.

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet
ExtendableEvent() constructor Experimental'	Chrome Full support 40	Edge Full support 17	Firefox Full support 44 Notes' Full support 44 Notes' Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.	IE No support No	Opera Full support 24	Safari No support No	WebView Android Full support 40	Chrome Android Full support 40	Firefox Android Full support 44	Opera Android Full support 24	Safari iOS No support No	Samsung Internet Android Full support 4.0

Legend

Full support  

Full support

No support  

No support

Experimental. Expect behavior to change in the future.'

Experimental. Expect behavior to change in the future.

See implementation notes.'

See implementation notes.

See also

• Using Service Workers
• Service workers basic code example
• Is ServiceWorker ready?
• Promise
• Using web workers

ExtendableEvent() by Mozilla Contributors is licensed under CC-BY-SA 2.5.