ExtendableMessageEvent()

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

Syntax

var extendableMessageEvent = 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 data 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

Browser compatibility

See also

• Using Service Workers
• Service workers basic code example
• Is ServiceWorker ready?
• Channel Messaging