ExtendableMessageEvent.lastEventId
The lastEventID
read-only property of the
ExtendableMessageEvent
interface represents, in server-sent
events, the last event ID of the event source. This is an empty string.
Value
A DOMString
.
Examples
When the following code is used inside a service worker to respond to a push messages
by sending the data received via PushMessageData
to the main context via
a channel message, the event
object of onmessage
will be a ExtendableMessageEvent
.
var port;
self.addEventListener('push', function(e) {
var obj = e.data.json();
if(obj.action === 'subscribe' || obj.action === 'unsubscribe') {
port.postMessage(obj);
} else if(obj.action === 'init' || obj.action === 'chatMsg') {
port.postMessage(obj);
}
});
self.onmessage = function(e) {
console.log(e.lastEventId);
port = e.ports[0];
}
Specifications
Specification |
---|
Service Workers 1 # extendablemessage-event-lasteventid |
Browser compatibility
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