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MessageEvent.MessageEvent()

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

Syntax

var messageEvent = new MessageEvent(type, init);

Parameters

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.

Example

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

Specifications

Specification Status Comment
Unknown
The definition of 'MessageEvent' in that specification.
Unknown Initial definition

Browser compatibility

Feature Chrome Edge Firefox (Gecko) Internet Explorer Opera Safari
Basic support 1 (Yes) 4.0 (2.0) 9 ? 10.0+
origin as USVString and source as MessageEventSource (Yes) ? 55.0 (55.0) No support ? ?
Feature Android Edge Firefox Mobile (Gecko) IE Mobile Opera Mobile Safari Mobile
Basic support ? (Yes) ? ? ? 3.0+
origin as USVString and source as MessageEventSource ? ? 55.0 (55.0) No support ? ?

See also

  • ExtendableMessageEvent — similar to this interface but used in interfaces that needs to give more flexibility to authors.

Document Tags and Contributors

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