Introduction to Progressive web app (PWA)

Nov 29, 20165 likes6,788 views

Progressive web apps (PWAs) are experiences that combine the best of the web and mobile apps. They load quickly, work offline, and feel like native mobile apps. The key aspects of PWAs include service workers for offline functionality, app shells for fast loading, and manifest files for home screen capabilities. PWAs use caching strategies and service workers to load from the cache first for offline access, then request updates from the network as needed. This provides a better user experience than online-first solutions which require network connectivity.

Introduction to Progressive web
app (PWA)
Zhentian Wan

What is PWA
Progressive Web Apps are experiences that combine the best of the web and the best of apps. They are useful to users
from the very first visit in a browser tab, no install required. As the user progressively builds a relationship with the App over
time, it becomes more and more powerful. It loads quickly, even on flaky networks, sends relevant push notifications, has
an icon on the home screen and loads as a top-level, full screen experience.
● Fast loading
● Native mobile feeling (Home screen, Push notification)
● Offline experience

Study Case
https://developers.google.com/web/showcase/2016/flipkart

PWA
● Web App
● Progressive enhancement
○ Means even some browser doesn’t support PWA, you website should still work as normal

PWA
● Web App
● Progressive enhancement
(https://jakearchibald.github.io/isserviceworkerready/)

What is PWA
● Service Worker (Offline Experience)
● App Shell (Fast Loading)
● Manifest.json (Home Screen)

APP Shell
The min HTML, CSS, JS that required to power up user interface.
Design Idea: What need to be displayed on screen immediately?

Firebase Hosting
1. Create a app on Firebase
2. Install firebase-toolbox
3. firebase login
4. firebase init
5. firebase deploy

Firebase Hosting
1. Create a app on Firebase
2. Install firebase-toolbox
3. firebase login
4. firebase init
5. firebase deploy (After first time)

Online first solution
Browser
Server
1. Send Requests

Online first solution
Browser
Server
1. Send Requests
2. Get data

Online first solution
Browser
Server
1. Send Requests
2. Get data
3. Response

Online first solution
Browser
Server
1. Send Requests
2. Get data
3. Response
Depend on
network
connection!

Offline first solution
Browser
ServerService
worker
1. Send
Requests

Offline first solution
Browser
ServerService
worker
1. Send
Requests
Cache

Offline first solution
Browser
ServerService
worker
2. Check from
cache if any
Cache

Offline first solution
Browser
ServerService
worker
3. Return cache
results
Cache

Offline first solution
Browser
ServerService
worker
4. Send request to
server
Cache

Offline first solution
Browser
ServerService
worker
5. Get data
Cache

Offline first solution
Browser
ServerService
worker
6. Return the data
Cache

Offline first solution
Browser
ServerService
worker
7. Update cache
Cache

Offline first solution
Browser
ServerService
worker
Cache
8. Send copy response back,
Update the interface

Offline first solution
Browser
ServerService
worker
Cache
LOCAL NETWORK
Requests
Fetch from
cache
Response No longer
depend on
network
connection

Offline first solution
Browser
ServerService
worker
Cache
LOCAL NETWORK
Requests
Fetch from
cache
Response
Offline

Introduction to Progressive web app (PWA)

PUSH NOTIFICATION APP DEMO
https://www.youtube.com/watch?v=Zq-tRtBN3ws

Resources
Code Lab: https://codelabs.developers.google.com/pwa-dev-summit
Udacity:
● Offline web app
● Progressive web app

SW-PRECACHE
https://github.com/GoogleChrome/sw-precache

Angular CLI
https://github.com/angular/angular-cli

Webpack Offline Plugin
https://github.com/NekR/offline-plugin

Offline first solution
Browser
ServerService
worker
1. Send
Requests
Cache IndexDB
2. Check from
cache /DB if any
3. Return cache
results
4. Send request to
server
5. Get data
6. Return the data

Progressive Web Apps (PWAs) provide an app-like user experience through the use of features like service workers, web app manifests, and push notifications. They load instantly, work offline, and can be installed on the home screen without an app store. Service workers act as a proxy to cache resources, enabling fast and reliable performance even in uncertain network conditions. PWAs are responsive across devices and browsers, and feel natural on each platform due to their immersive, app-like interfaces.

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Introduction to Progressive web app (PWA)

1. Introduction to Progressive web app (PWA) Zhentian Wan

2. What is PWA Progressive Web Apps are experiences that combine the best of the web and the best of apps. They are useful to users from the very first visit in a browser tab, no install required. As the user progressively builds a relationship with the App over time, it becomes more and more powerful. It loads quickly, even on flaky networks, sends relevant push notifications, has an icon on the home screen and loads as a top-level, full screen experience. ● Fast loading ● Native mobile feeling (Home screen, Push notification) ● Offline experience

3. Study Case https://developers.google.com/web/showcase/2016/flipkart

4. PWA ● Web App ● Progressive enhancement ○ Means even some browser doesn’t support PWA, you website should still work as normal

5. PWA ● Web App ● Progressive enhancement (https://jakearchibald.github.io/isserviceworkerready/)

6. What is PWA ● Service Worker (Offline Experience) ● App Shell (Fast Loading) ● Manifest.json (Home Screen)

7. APP Shell The min HTML, CSS, JS that required to power up user interface. Design Idea: What need to be displayed on screen immediately?

8. APP Shell The min HTML, CSS, JS that required to power up user interface. Design Idea: What need to be displayed on screen immediately?

9. Manifest.json

10. Splash Screen

11. Add to Home Screen

12. Service Worker

13. HTTPS

14. HTTPS Firebase

15. Firebase Hosting 1. Create a app on Firebase 2. Install firebase-toolbox 3. firebase login 4. firebase init 5. firebase deploy

16. Firebase Hosting 1. Create a app on Firebase 2. Install firebase-toolbox 3. firebase login 4. firebase init 5. firebase deploy (After first time)

17. Without SW Online first solution

18. Online first solution Browser Server 1. Send Requests

19. Online first solution Browser Server 1. Send Requests 2. Get data

20. Online first solution Browser Server 1. Send Requests 2. Get data 3. Response

21. Online first solution Browser Server 1. Send Requests 2. Get data 3. Response Depend on network connection!

22. Switch to Offline first solution

23. Offline first solution Browser ServerService worker 1. Send Requests

24. Offline first solution Browser ServerService worker 1. Send Requests Cache

25. Offline first solution Browser ServerService worker 2. Check from cache if any Cache

26. Offline first solution Browser ServerService worker 3. Return cache results Cache

27. Offline first solution Browser ServerService worker 4. Send request to server Cache

28. Offline first solution Browser ServerService worker 5. Get data Cache

29. Offline first solution Browser ServerService worker 6. Return the data Cache

30. Offline first solution Browser ServerService worker 7. Update cache Cache

31. Offline first solution Browser ServerService worker Cache 8. Send copy response back, Update the interface

32. Offline first solution Browser ServerService worker Cache LOCAL NETWORK Requests Fetch from cache Response No longer depend on network connection

33. Offline first solution Browser ServerService worker Cache LOCAL NETWORK Requests Fetch from cache Response Offline

34. OFFLINE APP DEMO

35. Caching Strategies SW-TOOLBOX

36. Network first, cache fallback

37. Cache first, network fallback

38. Cache only

39. Network only

41. Service worker life cycle

42. Service worker life cycle

43. PUSH NOTIFICATION APP DEMO https://www.youtube.com/watch?v=Zq-tRtBN3ws

44. Firebase Hosting DEMO

45. Resources Code Lab: https://codelabs.developers.google.com/pwa-dev-summit Udacity: ● Offline web app ● Progressive web app

46. SW-PRECACHE https://github.com/GoogleChrome/sw-precache

47. Angular CLI https://github.com/angular/angular-cli

48. Webpack Offline Plugin https://github.com/NekR/offline-plugin

49. Questions?

50. THANKS!

51. Offline first solution Browser ServerService worker 1. Send Requests Cache IndexDB 2. Check from cache /DB if any 3. Return cache results 4. Send request to server 5. Get data 6. Return the data

Introduction to Progressive web app (PWA)

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