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.

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

onupdatefound = (event) => {};

Event type

A generic Event.

Examples

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

Docs

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