ServiceWorkerRegistration.update()
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
serviceWorkerRegistration.update();
Parameters
None.
Return value
A Promise
that resolves with a ServiceWorkerRegistration
object.
Example
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:
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw-test/sw.js', {scope: 'sw-test'}).then(function(registration) {
// registration worked
console.log('Registration succeeded.');
button.onclick = function() {
registration.update();
}
}).catch(function(error) {
// registration failed
console.log('Registration failed with ' + error);
});
};
Specifications
Specification |
---|
Service Workers 1 # service-worker-registration-update |
Browser compatibility
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