The lastEventId read-only property of the MessageEvent interface is a DOMString representing a unique ID for the event.
MessageEvent.lastEventId
Value
A DOMString representing the ID.
Examples
myWorker.onmessage = function(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 |
1
|
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
