An Introduction to Service Workers

An Introduction to Service Workers

Service Workers are the biggest thing to hit the browser since XMLHttpRequest. We'll take a look at what the Service Worker can do for your app and more importantly, your users. We'll see the surprisingly small amount of code you need to get started with a Service Worker and finally we'll take a look at Progressive Web Apps and how the Service Worker will take part in a revolution for web applications.

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Links:

Offline apps course on Udacity: https://www.udacity.com/course/offline-web-applications--ud899

The demo SMS app: https://github.com/philnash/sms-messages-app

HTML5Rocks intro to service worker: http://www.html5rocks.com/en/tutorials/service-worker/introduction/
Service Worker spec: https://slightlyoff.github.io/ServiceWorker/spec/service_worker/
Is Service Worker Ready Yet? https://jakearchibald.github.io/isserviceworkerready/
And resources: https://jakearchibald.github.io/isserviceworkerready/resources.html
Service Worker Cookbook: http://www.serviceworke.rs/

Twilio Blog: Web powered SMS inbox with push notifications: https://www.twilio.com/blog/2016/02/web-powered-sms-inbox-with-service-worker-push-notifications.html
Background sync: https://developers.google.com/web/updates/2015/12/background-sync?hl=en

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Phil Nash

June 15, 2016
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Transcript

  1. AN INTRODUCTION TO SERVICE WORKERS

  2. Phil Nash @philnash http:/ /philna.sh philnash@twilio.com

  3. None
  4. AN INTRODUCTION TO SERVICE WORKERS

  5. SERVICE WORKERS ARE SCRIPTS THAT INTERCEPT NETWORK REQUESTS

  6. SO WEB DEVELOPERS CAN TREAT THE NETWORK AS AN ENHANCEMENT

  7. AND PROVIDE OFFLINE EXPERIENCES FOR USERS OF WEB APPLICATIONS

  8. None
  9. A SLIGHTLY LONGER INTRODUCTION TO SERVICE WORKERS

  10. XMLHttpRequest

  11. IN THE FUTURE WE WILL WONDER HOW WE COPED WITHOUT

    SERVICE WORKERS
  12. THE BIRTH OF THE SERVICE WORKER

  13. The Application Cache C A C H E M A

    N I F E S T # V e r s i o n 7 C A C H E : # S t y l e s h e e t s / s t y l e / a p p . c s s # J a v a S c r i p t s / j s / a p p . j s 0 1 . 0 2 . 0 3 . 0 4 . 0 5 . 0 6 . 0 7 . 0 8 .
  14. “THE APPLICATION CACHE IS A DOUCHEBAG”

  15. The Spec https:/ /slightlyoff.github.io/ServiceWorker/spec/service_worker/

  16. Browsers 40 27 44

  17. SO WHAT DOES IT REALLY DO?

  18. Install it n a v i g a t o

    r . s e r v i c e W o r k e r . r e g i s t e r ( " / s w . j s " ) ;
  19. Install it n a v i g a t o

    r . s e r v i c e W o r k e r . r e g i s t e r ( " / s w . j s " , { s c o p e : " / a d m i n " } ) ; 0 1 . 0 2 . 0 3 .
  20. Install it n a v i g a t o

    r . s e r v i c e W o r k e r . r e g i s t e r ( " / s w . j s " ) . t h e n ( f u n c t i o n ( ) { c o n s o l e . l o g ( " " ) ; } ) . c a t c h ( f u n c t i o n ( ) { c o n s o l e . l o g ( " " ) ; } ) ; 0 1 . 0 2 . 0 3 . 0 4 . 0 5 .
  21. It intercepts network requests / / s w . j

    s s e l f . a d d E v e n t L i s t e n e r ( " f e t c h " , f u n c t i o n ( e v e n t ) { / / d o s o m e t h i n g } ) ; 0 1 . 0 2 . 0 3 . 0 4 .
  22. IT'S A PROXY THAT YOU CONTROL

  23. SECURITY?

  24. HTTPS

  25. LOCALHOST

  26. DEMO

  27. WHY?

  28. WEB VS NATIVE

  29. Native Web Online by default Offline by default Discoverable on

    the web App store installation
  30. Native Web Offline first Offline by default Discoverable on the

    web App store installation
  31. DON'T CARE FOR OFFLINE?

  32. PERFORMANCE

  33. FALLBACKS

  34. None
  35. THERE'S MORE!

  36. PUSH NOTIFICATIONS

  37. DEMO

  38. Browsers 42 44

  39. WITH GREAT POWER…

  40. BACKGROUND SYNC

  41. DEMO

  42. Browsers 49

  43. GEOFENCING

  44. MAYBE...?

  45. PROGRESSIVE WEB APPS

  46. Progressive Web Apps • Service Worker (+ HTTPS) • manifest.json

    • User engagement
  47. APP INSTALL BANNERS

  48. None
  49. ICON ON HOMESCREEN

  50. ...

  51. $$ PROFIT! $$

  52. SERVICE WORKERS

  53. ENHANCEMENT

  54. IN THE FUTURE WE WILL WONDER HOW WE COPED WITHOUT

    SERVICE WORKERS
  55. AND IF YOU'RE NOT YET CONVINCED...

  56. None
  57. THANKS!

  58. None
  59. Use the code PNASH20 for 20% off ticket prices

  60. Help me! On a scale of 0 to 10, how

    likely is it that you would recommend this talk to a friend or colleague? 020 3322 5761
  61. Thanks! @philnash http:/ /philna.sh philnash@twilio.com On a scale of 0

    to 10, how likely is it that you would recommend this talk to a friend or colleague? 020 3322 5761