ServiceWorkerRegistration: updatefound event

Secure context: This feature is available only in secure contexts (HTTPS), in some or all supporting browsers.

Note: This feature is available in Web Workers.

The updatefound event of the ServiceWorkerRegistration interface is fired any time the ServiceWorkerRegistration.installing property acquires a new service worker.

Syntax

Use the event name in methods like addEventListener(), or set an event handler property.

js
addEventListener("updatefound", (event) => { })

onupdatefound = (event) => { }

Event type

A generic Event.

Examples

js
const registration = await navigator.serviceWorker.getRegistration();
if (registration) {
  registration.addEventListener("updatefound", () => {
    console.log("Service Worker update found!");
  });
}

Specifications

See also