Going Offline

adactio.com

resilientwebdesign.com

2005

JavaScript When someone mouses over a link, make it look different. When someone fills out a form, make sure the inputs are valid.

JavaScript Find stuff and do stuff to it.

JavaScript Find stuff and do stuff to it. jQuery

JavaScript Find stuff and do stuff to it. $(‘.stuff’).click(doStuff); jQuery

JavaScript document.querySelector(‘.stuff’) .addEventListener(‘click’, doStuff); Find stuff and do stuff to it. $(‘.stuff’).click(doStuff); jQuery

JavaScript code Logic.

JavaScript Logic. code

2007

Update part of this page with data from a server. Ajax

DOM Scripting Find stuff on this page and do stuff to it. Update part of this page with data from a server. Ajax

DOM Scripting web worker Ajax

web worker

service worker

2018

example.com

page.html styles.css script.js icon.png example.com

serviceworker.js example.com

serviceworker.js https ://example.com

https

register install active update life cycle

register

install

active

update

active

register

register Get the JavaScript file ‘serviceworker.js’

register <script src=”/serviceworker.js”> </script>

register <script> navigator.serviceWorker.register(); </script>

register <script> navigator.serviceWorker.register (‘/serviceworker.js’); </script>

register <script> navigator.serviceWorker.register (‘/assets/js/serviceworker.js’); </script>

register <script> navigator.serviceWorker.register (‘/serviceworker.js’); </script>

register <script> if (navigator.serviceWorker) { navigator.serviceWorker.register (‘/serviceworker.js’); } </script>

register Get the JavaScript file ‘serviceworker.js’

register Install the JavaScript file ‘serviceworker.js’

install

install caching

memory cache browser cache Cache API caching

install precaching

install styles.css script.js icon.png

install script.js styles.css icon.png

install

install precaching

precaching When this service worker is installing open a cache and then put a bunch of files in that cache.

precaching When this service worker is installing

precaching When this service worker is installing addEventListener()

precaching When this service worker is installing addEventListener(‘install’)

precaching When this service worker is installing addEventListener(‘install’, function(event) { });

precaching When this service worker is installing addEventListener(‘install’, event => { });

precaching open a cache

precaching open a cache caches.open()

precaching open a cache caches.open(‘files’)

precaching open a cache and then caches.open(‘files’)

precaching open a cache and then caches.open(‘files’).then()

precaching open a cache and then caches.open(‘files’).then( cache => { });

precaching put a bunch of files in that cache.

precaching put a bunch of files in that cache. cache.addAll()

precaching put a bunch of files in that cache. cache.addAll([ ‘/css/styles.css’, ‘/js/script.js’, ‘/img/icon.png’ ]);

precaching

precaching When this service worker is installing addEventListener(‘install’, event => { });

precaching When this service worker is installing open a cache caches.open(‘files’)

precaching When this service worker is installing open a cache and then caches.open(‘files’).then( cache => { });

precaching When this service worker is installing open a cache and then put a bunch of files in that cache. cache.addAll([ ‘/css/styles.css’, ‘/js/script.js’, ‘/img/icon.png’ ]);

precaching When this service worker is installing open a cache and then put a bunch of files in that cache.

precaching addEventListener(‘install’, event => { });

precaching addEventListener(‘install’, event => { caches.open(‘files’) });

precaching addEventListener(‘install’, event => { caches.open(‘files’).then( cache => { }); });

precaching addEventListener(‘install’, event => { caches.open(‘files’).then( cache => { cache.addAll([ ‘/css/styles.css’, ‘/js/script.js’, ‘/img/icon.png’ ]); }); });

install

active

cache first When a file is requested try to find the file in the cache first otherwise fetch the file from the network.

cache first When a file is requested

cache first When a file is requested addEventListener()

cache first When a file is requested addEventListener(‘fetch’)

cache first When a file is requested addEventListener(‘fetch’, event => { });

cache first When a file is requested addEventListener(‘fetch’, event => { event.respondWith( ); });

cache first try to find the file in the cache first

cache first try to find the file in the cache first caches.match(event.request)

cache first try to find the file in the cache first caches.match(event.request) .then( response => { })

cache first try to find the file in the cache first caches.match(event.request) .then( response => { return response; })

cache first try to find the file in the cache first otherwise fetch the file from the network. caches.match(event.request) .then( response => { return response; })

cache first try to find the file in the cache first otherwise fetch the file from the network. caches.match(event.request) .then( response => { return response || fetch(event.request); })

cache first When a file is requested try to find the file in the cache first otherwise fetch the file from the network.

cache first addEventListener(‘fetch’, event => { event.respondWith( ); });

cache first addEventListener(‘fetch’, event => { event.respondWith( caches.match(event.request) .then( response => { return response }) ); });

cache first addEventListener(‘fetch’, event => { event.respondWith( caches.match(event.request) .then( response => { return response || fetch(event.request); }) ); });

cache first

offline first

offline first precaching cache first install active

css js img precaching cache first

html network first custom offline page

network first

precaching addEventListener(‘install’, event => { caches.open(‘files’).then( cache => { cache.addAll([ ‘/css/styles.css’, ‘/js/script.js’, ‘/img/icon.png’ ]); }); });

precaching addEventListener(‘install’, event => { caches.open(‘files’).then( cache => { cache.addAll([ ‘/css/styles.css’, ‘/js/script.js’, ‘/img/icon.png’, ‘/offline.html’ ]); }); });

network first When a page is requested try to fetch the page from the network first otherwise retrieve the oﬄine page from the cache.

network first When a page is requested addEventListener(‘fetch’, event => { });

network first When a page is requested addEventListener(‘fetch’, event => { if (event.request.headers .get(‘Accept’).includes(‘text/html’) { } });

network first try to fetch the page from the network first event.respondWith( fetch(event.request) .then( response => { return response; }) );

network first otherwise retrieve the oﬄine page from the cache. .catch( error => { return caches.match(‘/offline.html’); })

network first

network first addEventListener(‘fetch’, event => { if (event.request.headers.get(‘Accept’).includes(‘text/html’) { } });

network first addEventListener(‘fetch’, event => { if (event.request.headers.get(‘Accept’).includes(‘text/html’) { event.respondWith( fetch(event.request) .then( response => { return response; }) } }); );

network first addEventListener(‘fetch’, event => { if (event.request.headers.get(‘Accept’).includes(‘text/html’) { event.respondWith( fetch(event.request) .then( response => { return response; }) .catch( error => { return caches.match(‘offline.html’); }) ); } });

html network first custom offline page

html network first cache as you go custom offline page

html network cache custom offline page

cache as you go When a page is requested try to fetch the page from the network first and store a copy in the cache otherwise try to retrieve the page from the cache otherwise retrieve the oﬄine page from the cache.

custom offline page offline.html

css js img html cache network network cache fallback

css js img html speed freshness

articles shopping travel games reference

cache on demand articles

cache on demand When the user presses a button put a copy of this page in the cache.

cache on demand page.html

una.im

sarasoueidan.com

archive.dconstruct.org

web app manifest https service worker

web app manifest <link rel=”manifest” href=”/manifest.json”>

web app manifest { } name: “Resilient Web Design”, short_name: “Resilience”, display: “standalone”, start_url: “/”, theme_color: “#5f7995”, icons: { { src: “/icon.png”, sizes: “512x512”, type: “image/png” } }

web app manifest https service worker progressive web app

“ I have a really hard time describing what a progressive web app actually is.” —What the heck is a “Progressive Web App”? Seriously.

“ A progressive web app is an enhanced version of a Single Page App (SPA) with a native app feel.” —Building Progressive Web Apps

“ Before You Build a PWA You Need a SPA” —hackernoon.com

“ I’ve seen too many devs assume PWA is a subset of SPA. We need to improve our messaging” —Jake Archibald

“ A Progressive Web App is a regular website following a progressive enhancement strategy to deliver native-like user experiences by using modern Web standards.” —What is a PWA

“ The name isn’t for you and worrying about it is distraction from just building things that work better for everyone. … It’s marketing, just like HTML5 had very little to do with actual HTML.” —Naming Progressive Web Apps

Site is served over HTTPS All app URLs load while offline Metadata provided for Add to Home screen Pages are responsive First load fast even on 3G Site works cross-browser Each page has a URL Page transitions don’t block on the network

HTTPS offline Metadata

HTTPS offline Metadata HTTPS + service worker + web app manifest = progressive web app

progressive

Thank you