ServiceWorkerRegistration: update() method
The update()
method of the
ServiceWorkerRegistration
interface attempts to update the service
worker. It fetches the worker's script URL, and if the new worker is not byte-by-byte
identical to the current worker, it installs the new worker. The fetch of the worker
bypasses any browser caches if the previous fetch occurred over 24 hours ago.
Note: This feature is available in Web Workers.
Syntax
js
update()
Parameters
None.
Return value
A Promise
that resolves with a ServiceWorkerRegistration
object.
Examples
The following simple example registers a service worker example then adds an event handler to a button so you can explicitly update the service worker whenever desired:
js
if ("serviceWorker" in navigator) {
navigator.serviceWorker
.register("/sw.js", { scope: "/" })
.then((registration) => {
// registration worked
console.log("Registration succeeded.");
button.onclick = () => {
registration.update();
};
})
.catch((error) => {
// registration failed
console.error(`Registration failed with ${error}`);
});
}
Specifications
Specification |
---|
Service Workers # service-worker-registration-update |
Browser compatibility
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