by Gerard Sans |  @gerardsans

Offline-first made easy using

Angular & PWAs

Offline-first made easy using

Angular & PWAs

SANS

GERARD

Developer Evangelist

Developer Evangelist

International Speaker

Spoken at 162 events in 37 countries

Serverless Training

Serverless Training

What is Offline first?

Icons made by Gregor Cresnar from www.flaticon.com is licensed by CC 3.0 BY
Icons made by Darius Dan from www.flaticon.com is licensed by CC 3.0 BY

Offline First for Web

Reliable

Storage

background Layer 1

Native-like Features

Great User Experience

Offline

Ready

Created by potrace 1.16, written by Peter Selinger 2001-2019

Progressive Web Apps

PWA Core Requirements

image/svg+xml

Web App

Manifest

Service

Worker

Security

(HTTPS)

Service Worker Offline

index.html

Cache

Hosting

Service

Worker

OFFLINE

app.js

logo.png

app.js

logo.png

app.js

logo.png

app.js

logo.png

Chatty

Make it

a PWA!

$ ng add @angular/pwa

ngsw-config.json (added)
src/assets/icons/icon-*.png (added)
src/manifest.webmanifest (added)
angular.json (updated)
index.html (updated)
app.module.ts (updated)
src/app.component.ts

Run PWA plugin

<!doctype html>
<html lang="en">
<head>
  <meta charset="utf-8">
  <title>AmplifyDatastore</title>
  <link rel="icon" type="image/x-icon" href="favicon.ico">
+  <link rel="manifest" href="manifest.webmanifest">
+  <meta name="theme-color" content="#1976d2">
</head>
<body>
  <app-root></app-root>
+  <noscript>Please enable JavaScript.</noscript>
</body>
</html>
src/app.component.ts

index.html


import { ServiceWorkerModule } from '@angular/service-worker';
import { env } from '../environments/environment';

@NgModule({
  imports: [
    ServiceWorkerModule.register('ngsw-worker.js', { 
      enabled: env.production 
    })
  ],
})
export class AppModule { }
src/app.component.ts

app.module.ts

$ ng build --prod
src/app.component.ts

Test your PWA

└── dist
  ├── assets/icons
  ├── favicon.ico
  ├── index.html
  ├── manifest.webmanifest
  ├── safety-worker.js
  ├── ngsw.json
  └── ngsw-worker.js
$ npm i -g http-server 
$ http-server dist/amplify-datastore -o
{
  "index": "/index.html",
  "assetGroups": [ 
     { 
       "name": "app",
     }, 
     { 
       "name": "assets", 
     }
  ]
}
src/app.component.ts

ngsw-config.json

{
 "name": "app", 
 "installMode": "prefetch", // prefetch | lazy
 "resources": {
   "files": [ 
     "/favicon.ico", 
     "/index.html", 
     "/manifest.webmanifest", 
     "/*.css", 
     "/*.js"
   ],
   "urls": [ 
     "https://aws-amplify.github.io/images/Logos/Amplify-Logo-White.svg"
   ]
 } 
}
src/app.component.ts

ngsw-config.json (assetGroup: app)

{
  "name": "assets", 
  "installMode": "lazy", 
  "updateMode": "prefetch",
  "resources": {
    "files": [ 
      "/assets/**", 
      "/*.(eot|svg|cur|jpg|png|webp|gif|otf|ttf|woff|woff2|ani)"
    ]
  }
}
src/app.component.ts

ngsw-config.json (assetGroup: assets)

Chatty

PWA

Web, Mobile and Desktop

Icons made by Gregor Cresnar from www.flaticon.com is licensed by CC 3.0 BY
Icons made by Darius Dan from www.flaticon.com is licensed by CC 3.0 BY

Add to home screen

99% Offline-ready

  • Survives offline reload
  • Stores messages while offline
  • Shares messages when back online
  • User doesn't know if App is offline
// <div *ngIf="offline">You are offline.</div>
// app.component.ts
@Component(...)
export class AppComponent implements OnInit {
  offline : boolean = false;
  ngOnInit() {
    merge<boolean>(
      fromEvent(window, 'offline').pipe(mapTo(true)),
      fromEvent(window, 'online').pipe(mapTo(false)),
      of(!navigator.onLine)
    ).subscribe(offline => this.offline = offline);
  }
}
src/app.component.ts

Improve Offline UX

Icons made by Gregor Cresnar from www.flaticon.com is licensed by CC 3.0 BY
Icons made by Darius Dan from www.flaticon.com is licensed by CC 3.0 BY
  • Faster (pre-cached)
  • Online/Offline
  • Full screen app
  • Browser/Mobile/Desktop
  • Web/Native-like features
  • Slower
  • Online
  • Tab in browser
  • Browser
  • Web features

Web/SPA    vs    PWA

Try it!

amplify-datastore-chatty-pwa-angular

Offline-first made easy using Angular and PWAs

By Gerard Sans

Offline-first made easy using Angular and PWAs

Offline-first made easy using Angular and PWAs - the main attractive for PWAs is that they can work offline and be installed as a Desktop or Mobile apps. In this lightning talk, we are going to introduce how to build offline-first using Angular and PWAs. Join us to learn how you can use your Web Apps offline and run natively as Mobile or Desktop apps!

  • 367
Loading comments...

More from Gerard Sans