MessageEvent.lastEventId

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

Syntax

var myId = messageEvent.lastEventId;

Value

A DOMString representing the ID.

Example

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

Specifications

Specification
HTML Standard (HTML)
# dom-messageevent-lasteventid-dev

Browser compatibility

BCD tables only load in the browser

See also

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