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| 'use strict'; | |
| var cacheVersion = 1; | |
| var currentCache = { | |
| offline: 'offline-cache' + cacheVersion | |
| }; | |
| const offlineUrl = 'offline.html'; | |
| this.addEventListener('install', event => { | |
| event.waitUntil( | |
| caches.open(currentCache.offline).then(function(cache) { | |
| return cache.addAll([ | |
| './img/logo-4t1-invert.png', | |
| offlineUrl | |
| ]); | |
| }) | |
| ); | |
| }); | |
| this.addEventListener('fetch', event => { | |
| // request.mode = navigate isn't supported in all browsers | |
| // so include a check for Accept: text/html header. | |
| if (event.request.mode === 'navigate' || (event.request.method === 'GET' && event.request.headers.get('accept').includes('text/html'))) { | |
| event.respondWith( | |
| fetch(event.request.url).catch(error => { | |
| // Return the offline page | |
| return caches.match(offlineUrl); | |
| }) | |
| ); | |
| } | |
| else{ | |
| // Respond with everything else if we can | |
| event.respondWith(caches.match(event.request) | |
| .then(function (response) { | |
| return response || fetch(event.request); | |
| }) | |
| ); | |
| } | |
| }); |
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