ServiceWorkerGlobalScope: activate event
The activate
event of the ServiceWorkerGlobalScope
interface is fired when a ServiceWorkerRegistration
acquires a new ServiceWorkerRegistration.active
worker.
Bubbles | No |
---|---|
Cancelable | No |
Interface | ExtendableEvent |
Event handler property | ServiceWorkerGlobalScope.onactivate |
Examples
The following snippet shows how you could use an activate
event handler to upgrade a cache.
globalScope.addEventListener('activate', function(event) {
var cacheAllowlist = ['v2'];
event.waitUntil(
caches.forEach(function(cache, cacheName) {
if (cacheAllowlist.indexOf(cacheName) == -1) {
return caches.delete(cacheName);
}
})
);
});
You can also set up the event handler using the ServiceWorkerGlobalScope.onactivate
property:
globalScope.onactivate = function(event) {
...
};
Specifications
Browser compatibility
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
Chrome | Edge | Firefox | Internet Explorer | Opera | Safari | WebView Android | Chrome Android | Firefox for Android | Opera Android | Safari on IOS | Samsung Internet | |
activate_event |
40 |
≤79 |
44
Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API.
|
No |
24 |
11.1 |
40 |
40 |
44 |
24 |
11.3 |
4.0 |
See also
© 2005–2021 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/activate_event