service-worker.js

var CACHE_NAME = 'static-cache';

var urlsToCache = [
  '.',
  'index.html',
  'style.css',
  'app.js',
  'image_upload.js',
  'fart.mp3',
  'fart_laugh.m4a',
  'hallo.m4a',
  'jodl_song.m4a',
  'jodl_song_louder.mp3'
];

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


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

        return fetch(event.request).then(
          function(response) {
            // Check if we received a valid response
            if(!response || response.status !== 200 || response.type !== 'basic') {
              return response;
            }

            // IMPORTANT: Clone the response. A response is a stream
            // and because we want the browser to consume the response
            // as well as the cache consuming the response, we need
            // to clone it so we have two streams.
            var responseToCache = response.clone();

            caches.open(CACHE_NAME)
              .then(function(cache) {
                cache.put(event.request, responseToCache);
              });

            return response;
          }
        );
      })
    );
});



/*



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


self.addEventListener('fetch', function(event) 
{
	console.log(event);
	
  event.respondWith(
    caches.match(event.request)
    .then(function(response) {
      return response || fetchAndCache(event.request);
    })
  );
});

self.addEventListener('activate', function(event) {
  event.waitUntil(
    caches.keys().then(function(cacheNames) {
      return Promise.all(
        cacheNames.filter(function(cacheName) {
          // Return true if you want to remove this cache,
          // but remember that caches are shared across
          // the whole origin
        }).map(function(cacheName) {
          return caches.delete(cacheName);
        })
      );
    })
  );
});

function fetchAndCache(url) 
{
  return fetch(url)
  .then(function(response) {
    // Check if we received a valid response
    if (!response.ok) {
      throw Error(response.statusText);
    }
    return caches.open(CACHE_NAME)
    .then(function(cache) {
      cache.put(url, response.clone());
      return response;
    });
  })
  .catch(function(error) 
  {
    console.log('Request failed:', error);
    // You could return a custom offline 404 page here
  });
}
*/