MessageEvent: source property

{{APIRef("HTML DOM")}}{{AvailableInWorkers}}

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

Value

a MessageEventSource (which can be a {{glossary("WindowProxy")}}, {{domxref("MessagePort")}}, or {{domxref("ServiceWorker")}} object) representing the message emitter.

Examples

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

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• {{domxref("ExtendableMessageEvent")}} — similar to this interface but used in interfaces that needs to give more flexibility to authors.