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) { ... };
Examples
The following snippet shows how you could use an activate
event handler to upgrade a cache.
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. |
Working Draft | Initial definition |
Browser compatibility
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