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This is an experimental technology
Because this technology's specification has not stabilized, check the compatibility table for usage in various browsers. Also note that the syntax and behavior of an experimental technology is subject to change in future versions of browsers as the specification changes.
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
| 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 Extended Support Release (ESR.)