Merge pull request #20 from shweshi/dev

service worker updates

Author: shweshi

src/sw.js

@@ -3,55 +3,24 @@ var filesToCache = [
     '/',
     '/index.html',
     '/css/style.css',
-    '/js/main.js'
+    '/js/main.js',
+    '/images/'
 ];
 
 /* Start the service worker and cache all of the app's content */
-self.addEventListener('install', function (evt) {
-    evt.waitUntil(
-        caches.open(cacheName)
-            .then(function (cache) {
-                return cache.addAll(filesToCache);
-            })
+self.addEventListener('install', function (e) {
+    e.waitUntil(
+        caches.open(cacheName).then(function (cache) {
+            return cache.addAll(filesToCache);
+        })
     );
 });
 
 /* Serve cached content when offline */
-self.addEventListener('fetch', function (evt) {
-    if (evt.request.method !== 'GET') {
-        return;
-    }
-    evt.respondWith(fromCache(evt.request));
-
-    evt.waitUntil(update(evt.request).then(refresh))
-});
-
-function fromCache(request) {
-    return caches.open(cacheName)
-        .then(function (cache) {
-            return cache.match(request);
+self.addEventListener('fetch', function (e) {
+    e.respondWith(
+        caches.match(e.request).then(function (response) {
+            return response || fetch(e.request);
         })
-}
-
-function update(request) {
-    return caches.open(cacheName).then(function (cache) {
-        return fetch(request).then(function (response) {
-            return cache.put(request, response.clone()).then(function () {
-                return response;
-            });
-        });
-    });
-}
-
-function refresh(response) {
-    return self.clients.matchAll().then(function (clients) {
-        clients.forEach(function (client) {
-            var message = {
-                type: 'refresh',
-                url: response.url,
-                eTag: response.headers.get('ETag')
-            };
-            client.postMessage(JSON.stringify(message));
-        });
-    });
-}
+    );
+});