ServiceWorkerRegistration: updatefound event

{{APIRef("Service Workers API")}}{{SecureContext_Header}} {{AvailableInWorkers}}

The updatefound event of the {{domxref("ServiceWorkerRegistration")}} interface is fired any time the {{domxref("ServiceWorkerRegistration.installing")}} property acquires a new service worker.

Syntax

Use the event name in methods like {{domxref("EventTarget.addEventListener", "addEventListener()")}}, or set an event handler property.

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

onupdatefound = (event) => { }

Event type

A generic {{domxref("Event")}}.

Examples

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

Specifications

{{Specifications}}

Browser compatibility

{{Compat}}

See also

• Using Service Workers