caching

CaritasPWA.csproj

     <TargetFramework>netstandard2.1</TargetFramework>
     <RazorLangVersion>3.0</RazorLangVersion>
     <ServiceWorkerAssetsManifest>service-worker-assets.js</ServiceWorkerAssetsManifest>
+    <OutputType>Exe</OutputType>
+    <GenerateRuntimeConfigurationFiles>true</GenerateRuntimeConfigurationFiles>
+  </PropertyGroup>
+
+  <PropertyGroup Condition="'$(Configuration)|$(Platform)'=='Debug|AnyCPU'">
+    <Optimize>true</Optimize>
   </PropertyGroup>
 
   <ItemGroup>

CaritasPWA.csproj.user

   </PropertyGroup>
   <PropertyGroup>
     <ActiveDebugProfile>CaritasPWA</ActiveDebugProfile>
+    <NameOfLastUsedPublishProfile>FolderProfile</NameOfLastUsedPublishProfile>
   </PropertyGroup>
   <ItemGroup>
     <EmbeddedResource Update="Shared\ResourceFiles\Resources.it.resx">

Properties/launchSettings.json

     "IIS Express": {
       "commandName": "IISExpress",
       "launchBrowser": true,
-      "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
-      }
+      },
+      "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}"
     },
     "CaritasPWA": {
       "commandName": "Project",
       "launchBrowser": true,
-      "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}",
-      "applicationUrl": "https://localhost:5001;http://localhost:5000",
       "environmentVariables": {
         "ASPNETCORE_ENVIRONMENT": "Development"
-      }
+      },
+      "applicationUrl": "https://localhost:5001;http://localhost:5000",
+      "inspectUri": "{wsProtocol}://{url.hostname}:{url.port}/_framework/debug/ws-proxy?browser={browserInspectUri}"
     }
   }
-}
+}

wwwroot/service-worker.js

 // This is because caching would make development more difficult (changes would not
 // be reflected on the first load after each change).
 
+const staticCacheName = 'site-static-v1';
+const assets = [
+    '/',
+    '/index.html',
+    '/account',
+    '/account/Found',
+    '/account/Missing',
+    '/info',
+    '/caritas_services',
+    '/lost_found',
+    '/keydata',
+    '/keydata/Found',
+    '/keydata/Missing',
+    '/conclusion_found',
+    '/conclusion_missing',
+    '/doneimage',
+    'css/app.css',
+    '_content/BlazorColorPicker/colorpicker.css',
+    '_content/MatBlazor/dist/matBlazor.css',
+    'css/united/bootstrap.min.css',
+    'css/united/_bootswatch.min.css',
+    'css/united/_variables.min.css',
+    '_content/BlazorAnimate/blazorAnimateInterop.js',
+    '_content/MatBlazor/dist/matBlazor.js',
+    '_content/BlazorColorPicker/colorpicker.js',
+    'images/batch_found.png',
+    'images/batch_fundvelo.png',
+    'images/batch_kulturlegi.png',
+    'images/batch_markt.png',
+    'images/batch_missing.png',
+    'images/caritas_logo.png',
+    'images/integrate_logo.png',
+    'images/done.png',
+    'images/icon_camera.png',
+    'images/icon_driveupload.png',
+    'images/icon_location.png'
+];
+
+
 // install event
 self.addEventListener('install', evt => {
-    console.log("Service-Worker has been installed.");
+    evt.waitUntil(
+        caches.open(staticCacheName).then(cache => {
+            console.log('caching app assets');
+            cache.addAll(assets);
+        })
+    );
 });
 
 // activate event
 self.addEventListener('activate', evt => {
-    console.log("Service-Worker has been activated.");
+    //console.log("Service-Worker has been activated.");
+    evt.waitUntil(
+        caches.keys().then(keys => {
+            return Promise.all(keys
+                .filter(key => key !== staticCacheName)
+                .map(key => caches.delete())
+            )
+        })
+    );
 });
 
 
-self.addEventListener('fetch', () => { });
+self.addEventListener('fetch', evt => {
+    evt.respondWith(
+        caches.match(evt.request).then(cacheRes => {
+            return cacheRes || fetch(evt.request);
+        })
+    );
+});