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 | Status | Comment |
|---|---|---|
| HTML Living Standard The definition of 'MessageEvent: lastEventId' in that specification. |
Living Standard |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
| Desktop | Mobile | |||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
lastEventId | Chrome Full support 1 | Edge Full support 17 | Firefox Full support 4 | IE Full support 9 | Opera Full support Yes | Safari Full support 4 | WebView Android Full support Yes | Chrome Android Full support Yes | Firefox Android Full support Yes | Opera Android Full support Yes | Safari iOS Full support 3 | Samsung Internet Android Full support Yes |
Legend
- Full support
- Full support
See also
ExtendableMessageEvent— similar to this interface but used in interfaces that needs to give more flexibility to authors.