by Gerard Sans | @gerardsans
Offline-first made easy using
Angular & PWAs
Offline-first made easy using
Angular & PWAs
Developer Evangelist
Developer Evangelist
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Spoken at 162 events in 37 countries
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Serverless Training
What is Offline first?
Offline First for Web
Reliable
Storage
Native-like Features
Great User Experience
Offline
Ready
Progressive Web Apps
PWA Core Requirements
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 --prodsrc/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
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
- 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
