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 cacheWhitelist = ['v2'];
event.waitUntil(
caches.forEach(function(cache, cacheName) {
if (cacheWhitelist.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
Specification | Status | Comment |
Service WorkersThe definition of 'activate' in that specification. | Working Draft |
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
Update compatibility data on GitHub
Desktop | Mobile | |||||||||||
---|---|---|---|---|---|---|---|---|---|---|---|---|
|
Chrome
Full support 40 |
Edge
Full support ≤79 |
Firefox Full support 44 Full support 44 Notes' Extended Support Releases (ESR) before Firefox 78 ESR do not support service workers and the Push API. |
IE
No support No |
Opera
Full support 24 |
Safari
Full support 11.1 |
WebView Android
Full support 40 |
Chrome Android
Full support 40 |
Firefox Android
Full support 44 |
Opera Android
Full support 24 |
Safari iOS
Full support 11.3 |
Samsung Internet Android
Full support 4.0 |
Legend
- Full support
- Full support
- No support
- No support
- Experimental. Expect behavior to change in the future.'
- Experimental. Expect behavior to change in the future.
- See implementation notes.'
- See implementation notes.
See also
ServiceWorkerGlobalScope: activate event by Mozilla Contributors is licensed under CC-BY-SA 2.5.