Revision f76a95c7dcfc4553b8bbc67cf20bcacf816997fa authored by Geoffrey Sneddon on 25 April 2018, 21:33:28 UTC, committed by Geoffrey Sneddon on 30 April 2018, 12:46:37 UTC
1 parent 0ef9a74
register-and-activate-service-worker.js
async function registerAndActiveServiceWorker(script, scope, callback) {
const registration = await navigator.serviceWorker.register(script, {scope});
const serviceWorker =
registration.installing || registration.waiting || registration.active;
if (serviceWorker) {
waitForServiceWorkerActivation(scope, callback);
return;
}
registration.addEventListener('updatefound', event => {
waitForServiceWorkerActivation(scope, callback);
});
}
async function waitForServiceWorkerActivation(scope, callback) {
const registration = await navigator.serviceWorker.getRegistration(scope);
if (registration.active) {
callback(registration);
return;
}
const serviceWorker = registration.installing || registration.waiting;
serviceWorker.addEventListener('statechange', event => {
if (event.target.state == 'activated') {
callback(registration);
}
});
}
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