W3cubDocs

/Web APIs

ServiceWorkerRegistration: updatefound event

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

Specification
Service Workers
# dom-serviceworkerregistration-onupdatefound

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
updatefound_event 40 17 44 No 27 11.1 40 40 44 27 11.3 4.0

See also

© 2005–2023 MDN contributors.
Licensed under the Creative Commons Attribution-ShareAlike License v2.5 or later.
https://developer.mozilla.org/en-US/docs/Web/API/ServiceWorkerRegistration/updatefound_event