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ServiceWorkerGlobalScope.onactivate

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.

this.addEventListener('activate', function(event) {
  var cacheAllowlist = ['v2'];

  event.waitUntil(
    caches.forEach(function(cache, cacheName) {
      if (cacheAllowlist.indexOf(cacheName) == -1) {
        return caches.delete(cacheName);
      }
    })
  );
});

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
onactivate
40
17
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

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https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerGlobalScope/onactivate