MessageEvent: lastEventId property
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since April 2018.
Note: This feature is available in Web Workers.
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 # dom-messageevent-lasteventid-dev |
Browser compatibility
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See also
ExtendableMessageEvent— similar to this interface but used in interfaces that needs to give more flexibility to authors.