Refactor service worker to improve caching strategy and offline support

public/sw.js

@@ -1,47 +1,93 @@
 "use strict";
 
-const CACHE_NAME = "offline-cache-v1";
+// const CACHE_NAME = "offline-cache-v1";
+// const OFFLINE_URL = '/offline.html';
+
+// const filesToCache = [
+//     OFFLINE_URL
+// ];
+
+// self.addEventListener("install", (event) => {
+//     event.waitUntil(
+//         caches.open(CACHE_NAME)
+//             .then((cache) => cache.addAll(filesToCache))
+//     );
+// });
+
+// self.addEventListener("fetch", (event) => {
+//     if (event.request.mode === 'navigate') {
+//         event.respondWith(
+//             fetch(event.request)
+//                 .catch(() => {
+//                     return caches.match(OFFLINE_URL);
+//                 })
+//         );
+//     } else {
+//         event.respondWith(
+//             caches.match(event.request)
+//                 .then((response) => {
+//                     return response || fetch(event.request);
+//                 })
+//         );
+//     }
+// });
+
+// self.addEventListener('activate', (event) => {
+//     event.waitUntil(
+//         caches.keys().then((cacheNames) => {
+//             return Promise.all(
+//                 cacheNames.map((cacheName) => {
+//                     if (cacheName !== CACHE_NAME) {
+//                         return caches.delete(cacheName);
+//                     }
+//                 })
+//             );
+//         })
+//     );
+// });
+
+const CACHE_NAME = 'pds-app-cache-v1';
 const OFFLINE_URL = '/offline.html';
 
-const filesToCache = [
+const urlsToCache = [
-    OFFLINE_URL
+  '/',
+  '/admin',
+   OFFLINE_URL,
+  '/icons/icon-192x192.png',
+  '/icons/icon-512x512.png'
 ];
 
-self.addEventListener("install", (event) => {
+self.addEventListener('install', event => {
-    event.waitUntil(
+  event.waitUntil(
-        caches.open(CACHE_NAME)
+    caches.open(CACHE_NAME)
-            .then((cache) => cache.addAll(filesToCache))
+      .then(cache => cache.addAll(urlsToCache))
-    );
+      .then(self.skipWaiting())
+  );
 });
 
-self.addEventListener("fetch", (event) => {
+self.addEventListener('activate', event => {
-    if (event.request.mode === 'navigate') {
+  event.waitUntil(
-        event.respondWith(
+    caches.keys().then(keys =>
-            fetch(event.request)
+      Promise.all(keys.map(key => {
-                .catch(() => {
+        if (key !== CACHE_NAME) return caches.delete(key);
-                    return caches.match(OFFLINE_URL);
+      }))
-                })
+    )
-        );
+  );
-    } else {
+  self.clients.claim();
-        event.respondWith(
-            caches.match(event.request)
-                .then((response) => {
-                    return response || fetch(event.request);
-                })
-        );
-    }
 });
 
-self.addEventListener('activate', (event) => {
+self.addEventListener('fetch', event => {
-    event.waitUntil(
+  if (event.request.mode === 'navigate') {
-        caches.keys().then((cacheNames) => {
+    event.respondWith(
-            return Promise.all(
+      fetch(event.request).catch(() =>
-                cacheNames.map((cacheName) => {
+        caches.match(OFFLINE_URL)
-                    if (cacheName !== CACHE_NAME) {
+      )
-                        return caches.delete(cacheName);
-                    }
-                })
-            );
-        })
     );
+  } else {
+    event.respondWith(
+      caches.match(event.request).then(response =>
+        response || fetch(event.request)
+      )
+    );
+  }
 });