EmberConf 2015 – Ambitious UX for Ambitious Apps

AMBITIOUS UX FOR
AMBITIOUS APPS
EMBERCONF 2015
Lauren Elizabeth Tan
@sugarpirate_ @poteto

DESIGN DEV
Designer & Front End Developer

DESIGN IS HOW IT WORKS
GOOD DESIGN IS REACTIVE
GOOD DESIGN IS PLAYFUL
GOOD DESIGN IS INFORMATIVE
GOOD DESIGN IS INTUITIVE

“Most people make the mistake of thinking
design is what it looks like. That’s not what we
think design is. It’s not just what it looks like
and feels like. Design is how it works.”

applyConcatenatedProperties()
giveDescriptorSuper()
beginPropertyChanges()

FLOW OF DATA
&
MAINTAINING RELATIONSHIPS
BETWEEN THAT DATA

var EmberObject =
CoreObject.extend(Observable);

FUNCTIONAL REACTIVE
PROGRAMMING?

FUNCTIONAL REACTIVE PROGRAMMING?
Immutability
Some side effects

EVENT STREAMS
Things that consist of discrete events

.asEventStream('click')
https://gist.github.com/staltz/868e7e9bc2a7b8c1f754

PROPERTIES
Things that change and have a current state

Array.prototype#map
Array.prototype#filter
Array.prototype#reduce
Array.prototype#concat

Ember.observer
Ember.computed
Ember.Observable
Ember.Evented
Ember.on

THE OBSERVER PATTERN
Computed properties and observers

COMPUTED PROPERTIES
Transforms properties, and keeps relationships in sync

export default Ember.Object.extend({
fullName: computed('firstName', 'lastName', function() {
return `${get(this, 'firstName')} ${get(this, 'lastName')}`;
})
});

COMPUTED PROPERTY MACROS
Keeping things DRY

export default function(separator, dependentKeys) {
let computedFunc = computed(function() {
let values = dependentKeys.map((dependentKey) => {
return getWithDefault(this, dependentKey, '');
});
return values.join(separator);
});
return computedFunc.property.apply(computedFunc, dependentKeys);
};

DEMO
http://emberjs.jsbin.com/vubaga/12/edit?js,output

import joinWith from '...';
export default Ember.Object.extend({
fullName: joinWith(' ', [
'title',
'firstName',
'middleName',
'lastName',
'suffix'
])
});
get(this, 'fullName');
// Mr Harvey Reginald Specter Esq.

Ember.computed.{map,mapBy}
Ember.computed.{filter,filterBy}
Ember.computed.sort
Ember.computed.intersect
Ember.computed.setDiff
Ember.computed.uniq
Ember.computed.readTheAPIDocs
http://emberjs.com/api/#method_computed

OBSERVERS
Synchronously invoked when dependent
properties change

Waterboarding at Guantanamo Bay
sounds super rad if you don't know
what either of those things are.

The person who would proof read
Hitler's speeches was a grammar
Nazi.

If your shirt isn't tucked into your
pants, then your pants are tucked
into your shirt.

/index /usersroute:user
model()
{ this.store.find('user') }
// returns Promise

GET "https://foo.com/v1/api/users"
/loading
/error
resolve()
reject()

Service
ƈ
Reddit API
Index Route User RouteLoading Route
Fetch top posts
Component
Fetch user records resolve()
Get random message
Display shower thought

Ember.Service.extend({ ... });

messages : Ember.A([]),
topPeriods : [ 'day', 'week', 'month', 'year', 'all' ],
topPeriod : 'day',
subreddit : 'showerthoughts',

getPostsBy(subreddit, period) {
let url = `//www.reddit.com/r/${subreddit}/top.json?sort=top&t=${period}`;
return new RSVP.Promise((resolve, reject) => {
getJSON(url)
.then((res) => {
let titles = res.data.children.mapBy('data.title');
resolve(titles);
}).catch(/* ... */);
});
}

_handleTopPeriodChange: observer('subreddit', 'topPeriod', function() {
let subreddit = get(this, 'subreddit');
let topPeriod = get(this, 'topPeriod');
run.once(this, () => {
this.getPostsBy(subreddit, topPeriod)
.then((posts) => {
set(this, 'messages', posts);
});
});
}).on('init'),

export default Ember.Component.extend({
service : inject.service('shower-thoughts'),
randomMsg : computedSample('service.messages'),
loadingText : 'Loading',
classNames : [ 'loadingMessage' ]
});

export default function(dependentKey) {
return computed(`${dependentKey}.@each`, () => {
let items = getWithDefault(this, dependentKey, Ember.A([]));
let randomItem = items[Math.floor(Math.random() * items.get('length'))];
return randomItem || '';
}).volatile().readOnly();
}

DEMO
http://emberjs.jsbin.com/lulaki/35/edit?output

VISIBILITY OF SYSTEM STATUS
Jakob Nielsen — 10 Heuristics for User Interface Design

FLASH MESSAGES
Is it time for snacks yet?

Service
Routes Controllers
Message Component Message Component

Ember.get(this, 'flashes').success('Success!', 2000);
Ember.get(this, 'flashes').warning('...');
Ember.get(this, 'flashes').info('...');
Ember.get(this, 'flashes').danger('...');
Ember.get(this, 'flashes').addMessage('Custom message', 'myCustomType', 3000)
Ember.get(this, 'flashes').clearMessages();

SERVICE: PROPS
queue : Ember.A([]),
isEmpty : computed.equal('queue.length', 0),
defaultTimeout : 2000

SERVICE: PUBLIC API
success(message, timeout=get(this, 'defaultTimeout')) {
return this._addToQueue(message, 'success', timeout);
},
info(/* ... */) {
return ...;
},
warning(/* ... */) {
return ...;
},
danger(/* ... */) {
return ...;
},
addMessage(message, type='default', timeout=get(this, 'defaultTimeout')) {
return this._addToQueue(message, type, timeout);
}

SERVICE: PUBLIC API
clearMessages() {
let flashes = get(this, 'queue');
flashes.clear();
}

SERVICE: PRIVATE API
_addToQueue(message, type, timeout) {
let flashes = get(this, 'queue');
let flash = this._newFlashMessage(this, message, type, timeout);
flashes.pushObject(flash);
}

SERVICE: PRIVATE API
_newFlashMessage(service, message, type='info', timeout=get(this, 'defaultTimeout')) {
Ember.assert('Must pass a valid flash service', service);
Ember.assert('Must pass a valid flash message', message);
return FlashMessage.create({
type : type,
message : message,
timeout : timeout,
flashService : service
});
}

FLASH MESSAGE: PROPS
isSuccess : computed.equal('type', 'success'),
isInfo : computed.equal('type', 'info'),
isWarning : computed.equal('type', 'warning'),
isDanger : computed.equal('type', 'danger'),
defaultTimeout : computed.alias('flashService.defaultTimeout'),
queue : computed.alias('flashService.queue'),
timer : null

FLASH MESSAGE: LIFECYCLE HOOK
_destroyLater() {
let defaultTimeout = get(this, 'defaultTimeout');
let timeout = getWithDefault(this, 'timeout', defaultTimeout);
let destroyTimer = run.later(this, '_destroyMessage', timeout);
set(this, 'timer', destroyTimer);
}.on('init')

FLASH MESSAGE: PRIVATE API
_destroyMessage() {
let queue = get(this, 'queue');
if (queue) {
queue.removeObject(this);
}
this.destroy();
}

FLASH MESSAGE: PUBLIC API & OVERRIDE
destroyMessage() {
this._destroyMessage();
},
willDestroy() {
this._super();
let timer = get(this, 'timer');
if (timer) {
run.cancel(timer);
set(this, 'timer', null);
}
}

import FlashMessagesService from '...';
export function initialize(_container, application) {
application.register('service:flash-messages', FlashMessagesService, { singleton: true });
application.inject('controller', 'flashes', 'service:flash-messages');
application.inject('route', 'flashes', 'service:flash-messages');
}
export default {
name: 'flash-messages-service',
initialize: initialize
};

COMPONENT: TEMPLATE
{{#if template}}
{{yield}}
{{else}}
{{flash.message}}
{{/if}}

COMPONENT: PUBLIC API
classNames: [ 'alert', 'flashMessage' ],
classNameBindings: [ 'alertType' ],
alertType: computed('flash.type', function() {
let flashType = get(this, 'flash.type');
return `alert-${flashType}`;
}),
click() {
let flash = get(this, 'flash');
flash.destroyMessage();
}
});

{{#each flashes.queue as |flash|}}
{{#flash-message flash=flash}}
<h6>{{flash.type}}</h6>
<p>{{flash.message}}</p>
{{/flash-message}}
{{/each}}

DEMO
http://emberjs.jsbin.com/ranewo/46/edit?js,output

$ ember install:addon ember-cli-flash
$ npm install --save-dev ember-cli-flash

Draggable Dropzone
Draggable Item
Draggable Item
Draggable Item
Controller
sendAction()
Route

COMPONENT/VIEW EVENTS
http://emberjs.com/api/classes/Ember.View.html#toc_event-names

https://developer.mozilla.org/en-US/docs/Web/Guide/HTML/
Drag_operations#draggableattribute

https://developer.mozilla.org/en-US/docs/Web/API/DataTransfer#getData.28.29

classNames : [ 'draggableDropzone' ],
classNameBindings : [ 'dragClass' ],
dragClass : 'deactivated',
dragLeave(event) {
event.preventDefault();
set(this, 'dragClass', 'deactivated');
},
dragOver(event) {
event.preventDefault();
set(this, 'dragClass', 'activated');
},
drop(event) {
let data = event.dataTransfer.getData('text/data');
this.sendAction('dropped', data);
set(this, 'dragClass', 'deactivated');
}
});

classNames : [ 'draggableItem' ],
attributeBindings : [ 'draggable' ],
draggable : 'true',
dragStart(event) {
return event.dataTransfer.setData('text/data', get(this, 'content'));
}
});

<div class="selectedUsers">
{{#draggable-dropzone dropped="addUser"}}
<ul class="selected-users-list">
{{#each selectedUsers as |user|}}
<li>{{user.fullName}}</li>
{{/each}}
</ul>
{{/draggable-dropzone}}
</div>
<div class="availableUsers">
{{#each users as |user|}}
{{#draggable-item content=user.id}}
<span>{{user.fullName}}</span>
{{/draggable-item}}
{{/each}}
</div>

actions: {
addUser(userId) {
let selectedUsers = get(this, 'selectedUsers');
let user = get(this, 'model').findBy('id', parseInt(userId));
if (!selectedUsers.contains(user)) {
return selectedUsers.pushObject(user);
}
}
}

DEMO
http://emberjs.jsbin.com/denep/18/edit?js,output

Makes ambitious UX easy (and fun!)

Thank you!
@sugarpirate_ @poteto

EmberConf 2015 – Ambitious UX for Ambitious Apps

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