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 claim() method of the of the Clients interface allows an active Service Worker to set itself as the active worker for a client page when the worker and the page are in the same scope. This triggers an oncontrollerchange event on any client pages within the Service Worker's scope.
This method can be used with ServiceWorkerGlobalScope.skipWaiting() to ensure that updates to the underlying service worker take effect immediately for both the current client and all other active clients.
Syntax
ServiceWorkerClients.claim().then(function() {
// Do something
});
Parameters
None.
Returns
A Promise.
Example
The following example uses claim() inside a Service Worker's onActivate event handler so that a client page loaded in the same scope does not need to be reloaded before it can use the Service Worker.
self.addEventListener('install', function(event) {
event.waitUntil(self.skipWaiting());
});
self.addEventListener('activate', function(event) {
event.waitUntil(self.clients.claim());
});
Specifications
| Specification | Status | Comment |
|---|---|---|
| Service Workers The definition of 'Clients' in that specification. |
Working Draft | Initial definition. It is still under development (see issue 414 and issue 423). |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
|---|---|---|---|---|---|
| Basic support | 42.0 | 44.0 (44.0)[1] | No support | 24 | No support |
| Feature | Android | Firefox Mobile (Gecko) | Firefox OS | IE Mobile | Opera Mobile | Safari Mobile | Chrome for Android |
|---|---|---|---|---|---|---|---|
| Basic support | ? | 44.0 (44.0) | (Yes) | No support | ? | No support | ? |
[1] Service workers (and Push) have been disabled in the Firefox 45 & 52 Extended Support Releases (ESR.)