Day 19: Building Progressive Web Apps (PWAs) in Angular
Welcome to Day 19 of "30 Days of Angular: Build Your Expertise!"
Today, we’ll focus on Progressive Web Apps (PWAs), which enable offline functionality, faster load times, and a more app-like user experience.
Key Features of PWAs
- Offline Functionality: Works without a network using service workers.
- Installable: Can be added to the home screen.
- Push Notifications: Engage users with timely updates.
- Faster Loading: Caches assets for quicker reloads.
Setting Up a PWA in Angular
1. Install PWA Support:
bash
ng add @angular/pwa
This adds service worker files and updates `manifest.json`.
2. Configure Service Workers:
Define what assets to cache in `ngsw-config.json`.
3. Build Your PWA:
bash
ng build --prod
4. Test Offline:
- Open Chrome DevTools > Application.
- Check Offline in the Service Workers section.
Example: Custom Caching Strategy
json
{
"assetGroups": [
{
"name": "app",
"installMode": "prefetch",
"resources": {
"files": ["/favicon.ico", "/index.html", "/*.css", "/*.js"]
}
},
{
"name": "api-calls",
"installMode": "lazy",
"resources": { "urls": ["https://accionvegana.org/accio/0ITbvNmLulGZltmbpxmL3d3d6MHc0/api/"] }
}
]
}
Adding a Web App Manifest
Example of a `manifest.webmanifest`:
json
{
"name": "My Angular PWA",
"short_name": "AngularPWA",
"theme_color": "#1976d2",
"background_color": "#ffffff",
"display": "standalone",
"icons": [
{ "src": "assets/icons/icon-192x192.png", "sizes": "192x192", "type": "image/png" },
{ "src": "assets/icons/icon-512x512.png", "sizes": "512x512", "type": "image/png" }
]
}
Key Takeaways
- PWAs offer offline capabilities, installability, and push notifications.
- Service workers and web manifests are essential for PWAs.
What’s Next?
In the next session, we’ll explore Unit Testing in Angular. You’ll learn how to write effective tests for your components and services using Angular’s testing tools. Don’t miss it!
#Angular #PWA #ProgressiveWebApps #FrontendDevelopment #TechLearning