The lastEventId read-only property of the MessageEvent interface is a DOMString representing a unique ID for the event.
var myId = messageEvent.lastEventId;
A DOMString representing the ID.
myWorker.onmessage = function(e) {
result.textContent = e.data;
console.log('Message received from worker');
console.log(e.lastEventId);
};
| Specification | Status | Comment |
|---|---|---|
| Unknown The definition of 'lastEventId' in that specification. | Unknown | Initial definition |
| Desktop | ||||||
|---|---|---|---|---|---|---|
| Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | |
| Basic support | 1 | Yes | 4 | 9 | ? | 10 |
| Mobile | |||||||
|---|---|---|---|---|---|---|---|
| Android webview | Chrome for Android | Edge Mobile | Firefox for Android | Opera for Android | iOS Safari | Samsung Internet | |
| Basic support | ? | ? | ? | ? | ? | 3 | ? |
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