Going Offline

A presentation at An Event Apart Seattle in March 2019 in Seattle, WA, USA by Jeremy Keith

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Going Offline

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adactio.com

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adactio.com

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resilientwebdesign.com

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2005

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

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JavaScript Find stuff and do stuff to it.

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JavaScript Find stuff and do stuff to it. jQuery

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

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

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JavaScript code Logic.

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JavaScript Logic. code

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2007

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

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

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

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DOM Scripting web worker Ajax

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web worker

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service worker

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2018

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example.com

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example.com

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example.com

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example.com

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example.com

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example.com

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

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serviceworker.js example.com

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serviceworker.js example.com

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serviceworker.js example.com

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serviceworker.js example.com

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serviceworker.js example.com

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serviceworker.js example.com

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serviceworker.js example.com

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serviceworker.js https ://example.com

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https

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register install active update life cycle

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register

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install

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active

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update

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update

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active

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register

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register Get the JavaScript file ‘serviceworker.js’

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

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

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

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

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

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

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

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

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register Get the JavaScript file ‘serviceworker.js’

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

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register Install the JavaScript file ‘serviceworker.js’

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

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install

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install caching

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memory cache browser cache Cache API caching

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install precaching

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install styles.css script.js icon.png

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install styles.css script.js icon.png

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install styles.css script.js icon.png

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install styles.css script.js icon.png

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install styles.css script.js icon.png

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install styles.css script.js icon.png

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install script.js styles.css icon.png

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install

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install precaching

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

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precaching When this service worker is installing

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precaching When this service worker is installing addEventListener()

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

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

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

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precaching open a cache

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precaching open a cache caches.open()

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

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

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

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

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precaching put a bunch of files in that cache.

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

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

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precaching

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

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

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

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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’ ]);

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

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

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

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

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

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

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install

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active

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

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cache first When a file is requested

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cache first When a file is requested addEventListener()

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

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

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

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cache first try to find the file in the cache first

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

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

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

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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; })

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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); })

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

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

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

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

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

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cache first

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offline first

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offline first

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offline first

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offline first

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offline first

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offline first

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offline first

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offline first

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offline first precaching cache first install active

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css js img precaching cache first

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html network first custom offline page

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network first

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

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

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

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

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

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

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

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network first

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

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

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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’); }) ); } });

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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’); }) ); } });

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html network first custom offline page

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html network first cache as you go custom offline page

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html network cache custom offline page

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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.

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custom offline page offline.html

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css js img html cache network network cache fallback

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css js img html speed freshness

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articles shopping travel games reference

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cache on demand articles

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

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cache on demand page.html

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una.im

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una.im

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una.im

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sarasoueidan.com

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sarasoueidan.com

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archive.dconstruct.org

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archive.dconstruct.org

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archive.dconstruct.org

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archive.dconstruct.org

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web app manifest https service worker

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

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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” } }

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web app manifest https service worker progressive web app

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

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

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

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

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“ 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

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“ 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

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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

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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

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HTTPS offline Metadata

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

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progressive

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progressive

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Thank you