1.
PWA
& Service Worker Anna Su
1

2.
Anna Su
PIXNET
2
About me

3.
Why PWA?
What's PWA?
What's Service Workers
Making A Service Worker
3
Agenda

4.
PWA
4
Why

5.
5
What’s Wrong?

6.
What’s Wrong with
Web ?
Slow mobile network
User-unfriendly
6

7.
What’s Wrong with
Web ?
Slow mobile network
7
53% 3s

8.
What’s Wrong with
Web ?
User-unfriendly
8
Splash Screen push notifications

9.
What’s Wrong with
App ?
High cost
Difficultly share
9

10.
What’s Wrong with
App ?
High cost
10
iOS WindowsAndroid

11.
What’s Wrong with
App ?
Difficultly share
11
from Alex Russell in Chrome Dev Summit 2015
1
month
25 100+
App Web

12.
What’s Wrong with
App ?
12
Alex Russell in Chrome Dev Summit 2015 ignite online & comScore

13.
13

14.
PWA
14
What’s
Progressive Web App

15.
15
Reliable Fast EngagingReliable

16.
What’s PWA ?
Reliable
16

17.
What’s PWA ?
Fast
17

18.
What’s PWA ?
Engaging
18

19.
Chrome Dev Summit 2014
[github]
How does the PWA
looks like
19

20.
20

21.
Service Workers
21
What’s

22.
22
What’s Service Workers ?

23.
What’s Service Workers ?
23

24.
24
What’s Service Workers ?

25.
Service Workers
Lifecycle
25

26.
Making
A
Service Worker
26

27.
27
Making A Service Workers
design @Don

28.
simple-pwa-demo
PWA To-Do List with Vanilla JS
(sw-precache)
(sw-precache-webpack-plugin)
PWA To-Do List with React/Redux
28
@Octocat
Making A Service Workers
code review -Jerry Hong

29.
Getting Started with Service Workers
29

30.
Registering the Service Worker
Setting up the Default Cache
Clearing Old Cache
Handling Fetch Requests
30
Making A Service Workers

31.
31
Register install activate fetch
Making A Service Workers
Register
Registering the Service Worker

32.
Registering the Service Worker
32
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
.then(reg => console.log('SW registered!', reg))
.catch(err => console.log('Error!', err));
}
</script>
index.html
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
.then(reg => console.log('SW registered!', reg))
.catch(err => console.log('Error!', err));
}
</script>
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
.then(reg => console.log('SW registered!', reg))
.catch(err => console.log('Error!', err));
}
</script>
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
.then(reg => console.log('SW registered!', reg))
.catch(err => console.log('Error!', err));
}
</script>
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
.then(reg => console.log('SW registered!', reg))
.catch(err => console.log('Error!', err));
}
</script>
<script>
if ('serviceWorker' in navigator) {
navigator.serviceWorker.register('/sw.js')
.then(reg => console.log('SW registered!', reg))
.catch(err => console.log('Error!', err));
}
</script>

33.
33
Register install activate fetch
Making A Service Workers
Register
Service Worker Lifecycle
install activate fetch

34.
Getting Started with Service Workers
34
// install
self.addEventListener('install', event => {
console.log('installing…');
});
// activate
self.addEventListener('activate', event => {
console.log('now ready to handle fetches!');
});
// fetch
self.addEventListener('fetch', event => {
console.log('now fetch!');
});
sw.js

35.
35
Register install activate fetch
Setting up the Default Cache
Making A Service Workers

36.
Setting up the Default Cache
36
sw.js
const filesToCache = [
'/',
'/assets/images/btn_check.png',
'/assets/images/btn_del.png',
'/assets/images/ic_add.png',
'/assets/images/logo_todo.png',
'/src/main.css',
'/index.html'
];
const cacheName = 'todolist-v1';

37.
Setting up the Default Cache
37
sw.js
// install
self.addEventListener('install', event => {
console.log('installing…');
event.waitUntil(
caches.open(cacheName).then(cache => {
// console.log('Caching app ok');
return cache.addAll(filesToCache);
})
);
});
// install
self.addEventListener('install', event => {
console.log('installing…');
event.waitUntil(
caches.open(cacheName).then(cache => {
// console.log('Caching app ok');
return cache.addAll(filesToCache);
})
);
});
// install
self.addEventListener('install', event => {
console.log('installing…');
event.waitUntil(
caches.open(cacheName).then(cache => {
// console.log('Caching app ok');
return cache.addAll(filesToCache);
})
);
});
// install
self.addEventListener('install', event => {
console.log('installing…');
event.waitUntil(
caches.open(cacheName).then(cache => {
// console.log('Caching app ok');
return cache.addAll(filesToCache);
})
);
});
// install
self.addEventListener('install', event => {
console.log('installing…');
event.waitUntil(
caches.open(cacheName).then(cache => {
// console.log('Caching app ok');
return cache.addAll(filesToCache);
})
);
});

38.
38
Register install activate fetch
Clearing Old Cache
Making A Service Workers

39.
`
39
// activate
self.addEventListener('activate', event => {
console.log('now ready to handle fetches!');
event.waitUntil(
caches.keys().then(function(cacheNames) {
var promiseArr = cacheNames.map(function(item) {
if (item !== cacheName) {
// Delete that cached file
return caches.delete(item);
}
})
return Promise.all(promiseArr);
})
); // end e.waitUntil
});
sw.js
// activate
self.addEventListener('activate', event => {
console.log('now ready to handle fetches!');
event.waitUntil(
caches.keys().then(function(cacheNames) {
var promiseArr = cacheNames.map(function(item) {
if (item !== cacheName) {
// Delete that cached file
return caches.delete(item);
}
})
return Promise.all(promiseArr);
})
); // end e.waitUntil
});
// activate
self.addEventListener('activate', event => {
console.log('now ready to handle fetches!');
event.waitUntil(
caches.keys().then(function(cacheNames) {
var promiseArr = cacheNames.map(function(item) {
if (item !== cacheName) {
// Delete that cached file
return caches.delete(item);
}
})
return Promise.all(promiseArr);
})
); // end e.waitUntil
});
// activate
self.addEventListener('activate', event => {
console.log('now ready to handle fetches!');
event.waitUntil(
caches.keys().then(function(cacheNames) {
var promiseArr = cacheNames.map(function(item) {
if (item !== cacheName) {
// Delete that cached file
return caches.delete(item);
}
})
return Promise.all(promiseArr);
})
); // end e.waitUntil
});
// activate
self.addEventListener('activate', event => {
console.log('now ready to handle fetches!');
event.waitUntil(
caches.keys().then(function(cacheNames) {
var promiseArr = cacheNames.map(function(item) {
if (item !== cacheName) {
// Delete that cached file
return caches.delete(item);
}
})
return Promise.all(promiseArr);
})
); // end e.waitUntil
});

40.
40
Register install activate fetch
Handling Fetch Requests
Making A Service Workers

41.
41
<script>
const list = document.getElementById('list');
// request
fetch('http://localhost:3000/people')
.then(res => {
return res.json();
})
.then(json => {
list.innerHTML = json
.map(item => `<li>${item.name}</li>`)
.join('');
})
</script>
index.html
Handling Fetch Requests

42.
Handling Fetch Requests
42
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
sw.js
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});
self.addEventListener('fetch', event => {
event.respondWith(
caches.match(event.request)
.then(function(response) {
return response || fetch(event.request)
.then(res =>
caches.open(dataCacheName)
.then(function(cache) {
cache.put(event.request, res.clone());
return res;
})
);
})
);
});

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Learn more?
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51.
PWA?
PWA?
Service Work
Registering the Service Worker
Setting up the Default Cache
Clearing Old Cache
Handling Fetch Requests
PWA To-Do List -
51
2017 iT

52.
ref
https://huangxuan.me/pwa-qcon2016/#/
https://medium.com/lets-grow-business/why-
progressive-web-app-31dd11d9a925#.zb3d2m1jv
https://igniteonline.com.au/why-progressive-web-
apps-beat-native-apps-hands-down/
52

53.
ref images
http://ninetailsfoxchan.deviantart.com/art/Sad-
Png-by-NFC-304044918
http://mrmen.wikia.com/wiki/File:Mr._All-
Goes_Wrong.PNG
https://goo.gl/022j4n
https://www.labnol.org/software/chrome-offline-
dinosaur-game/28781/
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54.
Thanks
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