AYB14 - offline first <3

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! Say Hello To Offline First How to build applications for the real world we <3 AYB

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Ola Gasidlo - Javascript for +10 years, full stack - Core Member of Hood.ie - Organizer of OpenTechSchool Dortmund ! twitter@misprintedtype github@zoepage

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Agenda! 1. What & why? 2. Problems 3. New approach 4. Implementation @misprintedtype

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What & why? @misprintedtype

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The internet turned 25 this year! @misprintedtype

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We grew up. @misprintedtype

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@misprintedtype

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amount of mobile-only web users is out of reach @misprintedtype

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Tell me... @misprintedtype

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@misprintedtype

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“WE CAN’T KEEP BUILDING APPS WITH THE DESKTOP MINDSET OF PERMANENT, FAST CONNECTIVITY, WHERE A TEMPORARY DISCONNECTION OR SLOW SERVICE IS REGARDED AS A PROBLEM AND COMMUNICATED AS AN ERROR.” @misprintedtype

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Problems @misprintedtype

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@misprintedtype

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@misprintedtype

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@misprintedtype

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offline > error handling @misprintedtype

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inform user @misprintedtype

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@misprintedtype

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build trust @misprintedtype

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http://branch.com/b/redesigning-the-save-symbol-let-s-do-this

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http://branch.com/b/redesigning-the-save-symbol-let-s-do-this

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organise data @misprintedtype

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@misprintedtype

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decide @misprintedtype

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@misprintedtype

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@misprintedtype

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@misprintedtype

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@misprintedtype

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@misprintedtype

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New Approaches @misprintedtype

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! Rethink! (but how?) @misprintedtype

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http://hood.ie

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Implementation! @misprintedtype

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files data

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files data

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Manifest @misprintedtype

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Manifest ++ offline app usage ++ fast loading ++ full experience for users @misprintedtype

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Manifest   ...  ! ! ! ! IE8+ / FF 3.5+ / Chrome 4.0+ / Safari 4.0+ / Opera 10.5+ / iPhone 2.0+ / Android 2.0+ @misprintedtype

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Manifest AddType text/cache-manifest .appcache ! @misprintedtype

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Manifest CACHE MANIFEST # 2013-11-13:v3 ! CACHE index.html ! NETWORK: *   FALLBACK: /online.html /offline.html ! @misprintedtype

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App Cache chrome://appcache-internals/ ! @misprintedtype

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App Cache is a douchebag! ! http://alistapart.com/article/application-cache-is-a-douchebag

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App Manifest ! 1. Files always come from the cache (also if you are online!) @misprintedtype

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App Manifest ! 2. App Cache only updates if manifest changed @misprintedtype

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App Manifest ! 3. App Cache is an additional cache @misprintedtype

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App Manifest ! 4. Never change the manifest URL @misprintedtype

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App Manifest ! 5. Non-cached resources will not load @misprintedtype

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! App Cache nanny ! ! https://www.npmjs.org/package/appcache-nanny @misprintedtype

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Service Worker ! - Additional cache - Deals with all requests - offline first, push notifications, background sync, performance @misprintedtype

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Service Worker ! ! ! https://github.com/slightlyoff/ServiceWorker https://jakearchibald.github.io/isserviceworkerready/ ! https://www.youtube.com/watch?v=SmZ9XcTpMS4&list=PL37ZVnwpeshGPw2RfUGNQbPsU_WGpi05J @misprintedtype

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files data

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files data

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! Do not harm humans!! (first law of robotics) @misprintedtype

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! Do not lose data!! (first law of offline first) @misprintedtype

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! ! ! ! PouchDB + CouchDB = <3 ! @misprintedtype

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CouchDB ! @misprintedtype

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@misprintedtype Ruth’s data  (share with John) John’s data Ruth’s partial data (replicated)

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PouchDB ! @misprintedtype

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PouchDB ! @misprintedtype

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PouchDB ! browser storage limitation confirm Firefox IndexedDB unlimited y Chrome / Opera / Android 4.4+ IndexedDB % of storage y IE 10+ SQLite 250MB n Mobile Safari WebSQL 50MB n Sarafi WebSQL 5MB -> 500MB y Android 4.3 and lower IndexedDB 200MB n