44 lines
1.1 KiB
JavaScript
44 lines
1.1 KiB
JavaScript
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const cacheName = 'vis3d-pwa-1',
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FILES_TO_CACHE = [
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'/index.html',
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'/empty.txt'
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];
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self.addEventListener('install', function (e) {
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e.waitUntil(
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caches.open(cacheName).then(function (cache) {
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return cache.addAll(FILES_TO_CACHE);
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})
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);
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});
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self.addEventListener('fetch', function (event) {
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if (event.request.method !== 'GET') return;
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event.respondWith(handle.bind(event).call().then(r => {
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return r
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}))
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});
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async function handle() {
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let event = this,
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url = event.request.url;
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if (url === self.registration.scope) {
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url += 'index.html';
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}
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const cache = await caches.open(cacheName);
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let response = await fetch(url).then((r) => {
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return r
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}).catch(async err => {
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let cachedResponse = await cache.match(url);
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if (cachedResponse) {
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return cachedResponse;
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}
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cachedResponse = await cache.match('/empty.txt');
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return cachedResponse;
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});
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if (response) {
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await cache.put(event.request, response.clone());
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return response;
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}
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}
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