The onactivate property of the ServiceWorkerGlobalScope
interface is an event handler fired whenever an activate
event occurs (when the service worker activates). This happens after installation, when the page to be controlled by the service worker refreshes.
Syntax
ServiceWorkerGlobalScope.onactivate = function(event) { ... }; ServiceWorkerGlobalScope.addEventListener('activate', function(event) { ... });
Example
The following snippet comes from Using Service Workers; go there for more details.
then.addEventListener('activate', function(event) { var cacheWhitelist = ['v2']; event.waitUntil( caches.forEach(function(cache, cacheName) { if (cacheWhitelist.indexOf(cacheName) == -1) { return caches.delete(cacheName); } }) ); });
Specifications
Specification | Status | Comment |
---|---|---|
Service Workers The definition of 'Event Handlers' in that specification. |
Editor's Draft | Initial definition |
Browser compatibility
Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari (WebKit) |
---|---|---|---|---|---|
Basic support | 40.0 | 44.0 (44.0)[1] | No support | ? | 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 | 40.0 |
[1] Service workers (and Push) have been disabled in the Firefox 45 and 52 Extended Support Releases (ESR.)