Web/API/MessageEvent/MessageEvent

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

Syntax

var messageEvent = new MessageEvent(type, init);

type

The type of MessageEvent that will be created. This can be one of XXX

init Optional

A dictionary object that can contain the following properties:

data: The data you want contained in the MessageEvent. This can be of any data type, and will default to null if not specified.
origin: A USVString representing the origin of the message emitter. This defaults to an empty string ("") if not specified.
lastEventId: A DOMString representing a unique ID for the event. This defaults to an empty string ("") if not specified.
source: An MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter. This defaults to null if not set.
ports: An array of MessagePort objects representing the ports associated with the channel the message is being sent through (where appropriate, e.g. in channel messaging or when sending a message to a shared worker). This defaults to an empty array ([]) if not specified.

var myMessage = new MessageEvent('worker', {
  data : 'hello'
});

Specification	Status	Comment
HTML Living StandardThe definition of 'MessageEvent()' in that specification.	Living Standard

	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
`MessageEvent()` constructor	Chrome Full support 1	Edge Full support 12	Firefox Full support 4	IE Full support 9	Opera ?	Safari Full support 4	WebView Android Full support 37	Chrome Android Full support 18	Firefox Android ?	Opera Android ?	Safari iOS Full support 3	Samsung Internet Android Full support 1.0