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serviceworker.js
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56 lines (43 loc) · 1.45 KB
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const CACHE_NAME = "version-1"
const urlsToCache = ['index.html', 'offline.html']
self.addEventListener('install', (event) => {
event.waitUntil(
caches.open(CACHE_NAME)
.then((cache) => {
console.log('Opened cache')
return cache.addAll(urlsToCache);
}
)
)
}
)
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(cachedResponse => {
// Return cached response if found
if (cachedResponse) return cachedResponse;
// Else fetch from network
return fetch(event.request)
.catch(() => {
// If both fail, show the offline page for navigation requests
if (event.request.mode === 'navigate' || (event.request.headers.get('accept') || '').includes('text/html')) {
return caches.match('offline.html');
}
});
})
);
});
self.addEventListener('activate', (event) => {
const cacheWhiteList = [];
cacheWhiteList.push(CACHE_NAME)
event.waitUntil(
caches.keys().then((cacheNames) => Promise.all(
cacheNames.map((cacheName) => {
if (!cacheWhiteList.includes(cacheName)) {
return caches.delete(cacheName)
}
})
))
)
})