js/pico-cam/service-worker.js


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var CACHE_NAME = 'pico-cam-v4';
var urlsToCache = [
  './',
  './index.html',
  './pico-cam.js',
  './service-worker.js',
  './favicon.ico'
];

self.addEventListener('install', function(event) {
    event.waitUntil(
        caches.open(CACHE_NAME)
            .then(function(cache) {
                console.log('Opened cache');
                return cache.addAll(urlsToCache);
            })
    );
});

self.addEventListener('fetch', function(event) {
    event.respondWith(
        caches.match(event.request)
            .then(function(response) {
                // Cache hit - return response
                if (response) {
                    return response;
                }
                return fetch(event.request);
            }
        )
    );
});

self.addEventListener('activate', function(event) {
    var cacheWhitelist = ['pico-cam-v4'];
    event.waitUntil(
        caches.keys().then(function(cacheNames) {
            return Promise.all(
                cacheNames.map(function(cacheName) {
                    if (cacheWhitelist.indexOf(cacheName) === -1) {
                        return caches.delete(cacheName);
                    }
                })
            );
        })
    );
});