say hello to offline first - goto...
TRANSCRIPT
Say Hello To Offline First
How to build applications for
the real world
we <3 GOTOBerlin
Ola Gasidlo- Developer for +10 years
- Core Member of Hoodie
- Co-Organizer of OTSConf && RejectJS
twitter: @misprintedtype
Agenda1. What & why?
2. Problems
3. New approach
4. Implementation@misprintedtype
What & why?
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The internet turned 25 last year!@misprintedtype
We grew up.@misprintedtype
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amount of mobile-only web users is out of reach @misprintedtype
Tell me...@misprintedtype
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Problems
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offline > error handling
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inform user
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build trust
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http://branch.com/b/redesigning-the-save-symbol-let-s-do-this
http://branch.com/b/redesigning-the-save-symbol-let-s-do-this
organise data
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decide
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New Approaches
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Rethink! (but how?)
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Implementation
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files
data
files
data
Manifest
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App Cache is a douchebag!
http://alistapart.com/article/application-cache-is-a-douchebag
App Manifest
1. Files always come from the cache
(also if you are online!)
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App Manifest
2. App Cache only updates if manifest changed
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App Manifest
3. App Cache is an additional cache
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App Manifest
4. Non-cached resources will not load
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App Cache nanny
https://www.npmjs.org/package/appcache-nanny
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Work it!
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Web what?!
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web worker - HTML5 feature
- runs JS in browser
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DOM
large API data
UI Events
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async !== concurrency
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Encoding && decoding large strings
Complex mathematical calculations
Prefetching && caching data
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Network requests
Manipulation on localStorage
Image manipulation
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real-time text analysis
processing video or audio data
Polling web services
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// windowwindow.alert(`Work it!`);
// documentdocument.getElementById(`danceParty`);
// parentwindow.globalFunction();
// worker.js - no access
no libs depending on these objects,
for example
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@misprintedtype / @lewiscowper
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// navigatornavigator.onLine;
// locationlocation.href;
// xhrxmlhttp.send();
// worker.js
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// appCacheapplicationCache.status;
// importimport `worker-script`;
// worker.js
@misprintedtype / @lewiscowper
Web workers - amazing litte helpers
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2 types of workers - dedicated workers
- shared workers
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dedicated worker
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shared worker
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function areWorkersAvailable() {
return !!window.Worker;
}
// available?
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// app.jsvar worker = new Worker(`task.js`);
// run worker run!
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?
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demo // map.jshttp://slides.html5rocks.com/#web-workers
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more demos // examples.jshttp://greenido.github.io/Web-Workers-Examples-/
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@misprintedtype / @lewiscowper
@misprintedtype / @lewiscowper
@misprintedtype / @lewiscowper
SPWA MPS
Service Worker
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Service Worker
Why?
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Service Worker
shut down at end of events
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Service Worker
scriptable caches
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Service Worker
promises
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SW lifecycle
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http://www.html5rocks.com/en/tutorials/service-worker/introduction/
http://www.html5rocks.com/en/tutorials/service-worker/introduction/
http://www.html5rocks.com/en/tutorials/service-worker/introduction/
https://jakearchibald.github.io/isserviceworkerready/
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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
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offline cookbook http://jakearchibald.com/2014/offline-cookbook/
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files
data
files
data
Do not harm humans!(first law of robotics)
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Do not lose data!(first law of offline first)
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PouchDB + CouchDB = <3
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CouchDB
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Stephans data(share with Hannes)
Hannes data
Stephans partial data (replicated)
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PouchDB
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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
Safari WebSQL 5MB -> 500MB y
Android 4.3 and lower
IndexedDB 200MB n
hoodie <3 you@misprintedtype / @hoodiehq