61 lines
1.7 KiB
JavaScript
61 lines
1.7 KiB
JavaScript
/**
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* Från
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* https://developer.mozilla.org/en-US/docs/Web/Progressive_web_apps/Offline_Service_workers (2021-06-09)
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* https://web.dev/offline-cookbook/
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*/
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const cacheKey = 'cache-v1';
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const cacheArray = [
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'/index.html',
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'/manifest.json',
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'/favicon.ico',
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'/icons/icon-72x72.png',
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'/icons/icon-96x96.png',
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'/icons/icon-128x128.png',
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'/icons/icon-144x144.png',
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'/icons/icon-152x152.png',
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'/icons/icon-180x180.png',
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'/icons/icon-192x192.png',
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'/icons/icon-32x32.png',
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'/icons/icon-48x48.png',
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'/icons/icon-512x512.png',
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'/css/style.css',
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'/js/script.js'
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];
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self.addEventListener('install', event => {
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console.log('Attempting to install service worker and cache static assets');
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event.waitUntil(
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caches.open(cacheKey)
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.then(cache => {
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return cache.addAll(cacheArray);
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})
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);
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});
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/** Rensar cache */
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self.addEventListener('activate', (e) => {
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e.waitUntil(caches.keys().then((keyList) => {
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return Promise.all(keyList.map((key) => {
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if (key === cacheKey) { return; }
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return caches.delete(key);
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}))
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}));
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});
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/** cache-filer först, upddaterar cache från servern */
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self.addEventListener('fetch', function (event) {
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if (!(event.request.url.indexOf('http') === 0)) return;
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event.respondWith(
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caches.open(cacheKey).then(function (cache) {
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return cache.match(event.request).then(function (response) {
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var fetchPromise = fetch(event.request).then(function (networkResponse) {
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cache.put(event.request, networkResponse.clone());
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return networkResponse;
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});
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return response || fetchPromise;
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});
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}),
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);
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});
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