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LEVERAGING HOOD.IE 
TO BUILD FOR THE OFFLINE STATE
BEING OFFLINE SUCKS 
No Wi-Fi No service 
Poor connectivity Unavailable
CONSEQUENCES 
Data loss Inaccessibility 
Long loading times Sluggish behavior
PAIN POINTS 
WHY MOST WEB APPS DON’T WORK OFFLINE
PAIN POINTS 
Every action depends on a connection 
Apps save all user-specific data online 
No fallback solution when connection fails
PAIN POINTS 
Every action depends on a connection 
We need offline first solutions 
Apps save all user-specific data online 
No fallback solution when connection fails
„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.“ 
— Jan Lehnardt, hood.ie team
We used HTML5 features to make the 
site available offline. Users can look 
up full information about conferences 
they're attending even if they have no 
data connection. 
— Jake Archibald, Lanyrd’s lead engineer
HOOD.IE ARCHITECTURE 
HOW IT BRIDGES THE „OFFLINE PROBLEM“
FRONTEND BACKEND 
App 
hoodie API 
localStorage 
couchDB
Angular.JS 
Backbone.JS 
Ember.JS 
Knockout.JS 
TheNextBigThing.JS 
hoodie API
SOME HOOD.IE BASICS 
QUICK START GUIDE FOR CODING COWBOYS
5-STEP—INSTALL 
$ 
$ 
$ 
$ 
$ 
brew install couchdb 
npm install -g hoodie-cli 
hoodie new cowboyapp 
cd cowboyapp 
hoodie start
INITIALIZATION 
<script src="hoodie.js"></script> 
hoodie = new Hoodie();
USER MANAGEMENT 
BACKEND-LESS AND RELENTLESSLY SIMPLE
I really want to implement user 
signup, sign in, sign out and the 
password forgotten function 
from scratch… 
?
SIGN UP AS NEW USER 
hoodie.account.signUp('chuck@norris.com', 'secret'); 
SIGN IN AS THIS USER 
hoodie.account.signIn('chuck@norris.com', 'secret');
App 
hoodie.accounts API 
couchDB 
signs up a new cowboy
PROMISES 
hoodie.account.signUp('chuck@norris.com', 'secret') 
.done(function(cowboy) { 
… 
} 
.fail(function(cowboy) { 
… 
});
HOOD.IE STORAGE 
PLAIN AND ROBUST OFFLINE DATA
ADD A NEW OBJECT 
var type = 'goldnugget'; 
var attributes = { category: 'raw', 
value: '$1200' }; 
hoodie.store.add(type, attributes) 
.done(function (goldnugget) { … }); 
ALL DATA IS PRIVATE BY DEFAULT, NOT PUBLIC!
App 
digs a gold nugget 
hoodie store API 
Hoodie’s API decouples client/server. 
It can get interrupted or stop at any 
stage without breaking. 
couchDB 
localStorage NoSQL storage
FINDING ALL OBJECTS 
var type = 'goldnugget'; 
hoodie.store.findAll(type) 
.done(function (goldnuggets) { … }); 
OTHER FUNCTIONS 
update(type, id, update), find(type, id), 
remove(type, id), removeAll(type)
HOOD.IE EVENTS 
GET NOTIFIED WHEN STUFF GETS FIRED
Account events 
Store events 
EVENT TYPES 
signup signin 
signout authenticated unauthenticated 
add update 
remove change add:bullet
IMPLEMENTING EVENTS 
hoodie.account.on('signin', function (user) {…}); 
USER HAS SIGNED IN, 
ALSO FIRES THE „AUTHENTICATED“ EVENT 
hoodie.store.on('add:bullet', function (bullet) {…}); 
WITH : WE CAN LISTEN TO CHANGES FOR A SPECIFIC OBJECT TYPE
App 
cowboy firing bullets 
hoodie.store 
couchDB 
localStorage
SYNCHRONIZATION 
BLAZING FAST REAL-TIME UPDATES
Cowboy 
couchDB 
hoodie.remote API 
localStorage 
Angry dude
COUCHDB CHANGES FEED 
{ 
seq: 12, 
id: "foo", 
"changes": [ 
{"rev": „1-2320…“} 
], 
hoodie.remote seq: 12, 
} 
id: "bar", 
"changes": [ 
{"rev": „1-2320…“} 
],
IMPLEMENTATION 
hoodie.remote.on('add:peng', function (peng) {…}); 
GETS CALLED WHEN AN EVENT IS TRIGGERED REMOTELY 
hoodie.remote.on('change', function (whatever) {…}); 
GETS CALLED FOR ANY OF THE EVENTS: ADD, UPDATE, REMOVE…
Events Synchronization 
Accounts Storage 
Pain points Architecture Basics
Every action depends on a connection 
Apps save all user-specific data online 
No fallback solution when connection fails
Actions can be performed without being connected 
Every action depends on a connection 
Apps save all user-specific data offline 
Apps save all user-specific data online 
Falls back to localStorage when connection fails 
No fallback solution when connection fails
CHECK OUT THE ALL 
NEW HOOD.IE WEBSITE
@marcelkalveram 
web developer at
THANK YOU FOR LISTENING 
PLEASE ASK YOUR QUESTIONS NOW

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Leveraging hood.ie to build for the offline state