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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

Desktop Mobile
Chrome Edge Firefox Internet Explorer Opera Safari WebView Android Chrome Android Firefox for Android Opera Android Safari on IOS Samsung Internet
lastEventId 2 17 3 9 ≤12.1 4 ≤37 18 4 ≤12.1 3.2 1.0

See also

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

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https://developer.mozilla.org/en-US/docs/Web/API/MessageEvent/lastEventId