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.
Syntax
var myClientId = FetchEvent.clientId;
Value
A DOMString that represents the client ID.
Example
self.addEventListener('fetch', function(event) {
console.log(event.clientId);
});
Specifications
| Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'clientId' in that specification. |
Working Draft | Initial definition. |
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.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | 49 | ? | 451 | No | 36 | No |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | 49 | 49 | ? | 45 | 36 | No | 5.0 |
1. Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)