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sw.js
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sw.js
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const CACHE_NAME = 'offline-cache-v1';
const urlsToCache = [
'/offline.html',
'/offline.png',
'/style.css',
'/script.js',
'/logo.png',
'/simple-2.3.2.min.css',
'/offline.js'
];
// Install event to cache multiple resources
self.addEventListener('install', (event) => {
event.waitUntil(
caches.open(CACHE_NAME).then((cache) => {
console.log('Opened cache');
return cache.addAll(urlsToCache);
})
);
});
// Fetch event to serve cached resources when offline
self.addEventListener('fetch', (event) => {
event.respondWith(
caches.match(event.request).then((response) => {
// Return cached response if available, else fetch from network
return response || fetch(event.request);
}).catch(() => {
// If both the cache and network fail, return the offline page
return caches.match('/offline.html');
})
);
});
// Activate event to clean up old caches
self.addEventListener('activate', (event) => {
const cacheWhitelist = [CACHE_NAME];
event.waitUntil(
caches.keys().then((cacheNames) => {
return Promise.all(
cacheNames.map((cacheName) => {
if (!cacheWhitelist.includes(cacheName)) {
return caches.delete(cacheName);
}
})
);
})
);
});