ServiceWorkerContainer.ready
The ready read-only property of
the ServiceWorkerContainer interface provides a way of delaying code
execution until a service worker is active. It returns a Promise that
will never reject, and which waits indefinitely until
the ServiceWorkerRegistration associated with the current page has
an active worker. Once that
condition is met, it resolves with
the ServiceWorkerRegistration.
Value
A Promise that will never reject, and which may eventually resolve with a
ServiceWorkerRegistration.
Examples
if ('serviceWorker' in navigator) {
navigator.serviceWorker.ready
.then(function(registration) {
console.log('A service worker is active:', registration.active);
// At this point, you can call methods that require an active
// service worker, like registration.pushManager.subscribe()
});
} else {
console.log('Service workers are not supported.');
}
Specifications
| Specification |
|---|
| Service Workers 1 # navigator-service-worker-ready |
Browser compatibility
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