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

FeatureChromeEdgeFirefoxInternet ExplorerOperaSafari
Basic support1 Yes49 ?10
FeatureAndroid webviewChrome for AndroidEdge mobileFirefox for AndroidOpera AndroidiOS SafariSamsung Internet
Basic support ? ? ? ? ?3 ?

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: fscholz, chrisdavidmills
Last updated by: fscholz,