MessageEvent: source property

Baseline Widely available

This feature is well established and works across many devices and browser versions. It’s been available across browsers since July 2015.

Note: This feature is available in Web Workers.

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.

Value

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

Examples

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

Specifications

Specification
HTML
# dom-messageevent-source-dev

Browser compatibility

See also

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