MessageEvent.source

The source read-only property of the MessageEvent interface is a MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter.

Syntax

let mySource = messageEvent.source;

Value

a MessageEventSource (which can be a WindowProxy, MessagePort, or ServiceWorker object) representing the message emitter.

Example

myWorker.onmessage = function(e) {
  result.textContent = e.data;
  console.log('Message received from worker');
  console.log(e.source);
};

Specifications

Browser compatibility

See also

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