ExtendableMessageEvent.ExtendableMessageEvent()

This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.

The ExtendableMessageEvent() constructor creates a new ExtendableMessageEvent object instance.

Syntax

var myEME = new ExtendableMessageEvent(type, init);

Parameters

type
A DOMString that defines the type of the message event being created.
init Optional
An initialisation object, which should contain the following parameters:
  • data: The event's data — this can be any type.
  • origin: A DOMString that defines the origin of the corresponding service worker's environment settings object.
  • lastEventId: A DOMString that defines the last event ID of the event source.
  • source: The Client, ServiceWorker or MessagePort that sent the message.
  • ports: An array containing the MessagePort objects connected to the channel sending the message.

Examples

var init = {
             data : 'hello message',
             source : MessagePortReference,
             ports : MessagePortListReference
           }
var myEME = new ExtendableMessageEvent('message', init);

Specifications

Specification Status Comment
Service Workers
The definition of 'ExtendableMessageEvent' in that specification.		 Working Draft Initial definition.

Browser compatibility

Feature Chrome Firefox (Gecko) Internet Explorer Opera Safari (WebKit)
Basic support (Yes) 45.0 (45.0)[1] No support ? No support
init option 51.0 ? ? ? ?
Feature Android Android Webview Firefox Mobile (Gecko) Firefox OS IE Mobile Opera Mobile Safari Mobile Chrome for Android
Basic support No support No support (Yes) (Yes) No support ? No support (Yes)
init option No support No support ? ? ? ? ? 51.0

[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)

See also

Document Tags and Contributors

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 Contributors to this page: chrisdavidmills, jpmedley
 Last updated by: chrisdavidmills,