This is an experimental technology
Check the Browser compatibility table carefully before using this in production.
The clientId read-only property of the FetchEvent returns the id of the Client that the current service worker is controlling.
The Clients.get() method could then be passed this ID to retrieve the associated client.
var myClientId = FetchEvent.clientId;
A DOMString that represents the client ID.
self.addEventListener('fetch', function(event) {
console.log(event.clientId);
}); | Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'clientId' in that specification. | Editor's Draft | Initial definition. |
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 49.0 | 45.0 (45.0)[1] | No support | ? | No support |
| Feature | Android | Android Webview | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|---|
| Basic support | No support | 49.0 | 45.0 (45.0) | (Yes) | No support | ? | No support | 49.0 |
[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)
Promise
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https://developer.mozilla.org/en-US/docs/Web/API/FetchEvent/clientId