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<!DOCTYPE html>
<html>
<body>
<script>
function logState(state) {
console.log("Service worker " + state)
}
const registerServiceWorker = async () => {
try {
var serviceWorker;
const registration = await navigator.serviceWorker.register('/sw.js');
if (registration.installing) {
serviceWorker = registration.installing;
} else if (registration.waiting) {
serviceWorker = registration.waiting;
} else if (registration.active) {
serviceWorker = registration.active;
}
} catch (error) {
console.error("Service worker registration error: ${error}");
}
if (serviceWorker) {
logState(serviceWorker.state);
serviceWorker.addEventListener('statechange', function(e) {
logState(e.target.state);
});
}
};
if ('serviceWorker' in navigator) {
registerServiceWorker();
navigator.serviceWorker.ready.then((registration) => {
navigator.serviceWorker.onmessage = (event) => {
if (event.data && event.data.type === 'PONG') {
console.log("Service worker done");
}
};
registration.active.postMessage({type: 'PING'});
});
}
</script>
</body>
</html>
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