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    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 ? 45.0 (45.0)[1] No support ? No support
    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 ?

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

    See also

    Document Tags and Contributors

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