inventur/serviceWorker.js

var CACHE_NAME = "inventur_cache-v1";
var urlsToCache = [
    '.',
    'js/app.js',
    'js/vue.js',
    'js/accounting.min.js',
    'js/moment-with-locales.min.js',
    'js/model/article.js',
    'js/model/inventory_article.js'
];

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

self.addEventListener('fetch', function(event){
    event.respondWith(
        caches.match(event.request)
            .then(function(response){
                if (response) {
                    return response;
                }
                var fetchRequest = event.request.clone();

                return fetch(fetchRequest).then(
                    function(response){
                        if(!response || response.status !== 200 || response.type !== 'basic') {
                            return response;
                        }

                        var responseToCache = response.clone();
                        caches.open(CACHE_NAME)
                            .then(function(cache){
                                cache.put(event.request, responseToCache);
                            });
                        
                        return response;
                    }
                )
            })
    );
});