MessageEvent: lastEventId property

The lastEventId read-only property of the MessageEvent interface is a string representing a unique ID for the event.

Value

A string representing the ID.

Examples

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

Specifications

Specification
HTML Standard
# dom-messageevent-lasteventid-dev

Browser compatibility

Chrome
Edge
Firefox
Opera
Safari
Chrome Android
Firefox for Android
Opera Android
Safari on iOS
Samsung Internet
WebView Android
Deno
Node.js
lastEventId

See also

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