City bars workshop

James Pearce
Director, Developer Relations
@jamespearce
jamesp@sencha.com

Build A
Mobile Web App
with
CSS
HTML JS

http://www.sencha.com/products/touch
Sencha Touch
A JavaScript framework for building
rich mobile apps with web standards

Pre-requisites
Sencha Touch SDK:
http://sencha.com/products/touch/
Yelp developer API key:
http://www.yelp.com/developers/getting_started/
api_overview
Install Sass and Compass:
http://sass-lang.com/download.html
http://compass-style.org/install/

CityBars
http://sencha.com/x/bu

Development sequence
1 Structure the app
2 Layout the UI
3 Model the data
4 Load the list
5 Attach events
6 Detail page
7 Add mapping
8 Customize theme

index.html
<!doctype html>
<html>
<head>
<title>City Guide</title>
</head>
<body></body>
</html>

index.html
<script src="lib/touch/sencha-‐touch.js"
type="text/javascript"></script>
<script type="text/javascript">
YELP_KEY
=
'G3HueY_I5a8WZX-‐_bFo3Mw';
...
</script>
<script src="app/app.js"
type="text/javascript"></script>
<link href="lib/touch/resources/css/sencha-‐touch.css"
rel="stylesheet" type="text/css" />

app.js
cb = new Ext.Application({
launch: function() {
new
Ext.Panel({
layout : 'card',
fullscreen: true,
html:
"Hello
world!"

});
}
});

cb.cards
2 Layout the UI
listCard detailCard
toolbar toolbar
dataList

index.html
cb = new Ext.Application({
launch: function() {
cb.cards = new Ext.Panel({
layout : 'card',
fullscreen: true,
cardSwitchAnimation:
'slide',

items:
[

{id:
'listCard'
...},

{id:
'detailCard'
...}

]

});
}
});

listCard
{
id: 'listCard',

layout:
'fit',

dockedItems: [{
dock : 'top',
xtype:
'toolbar',
title: 'Please wait'
}],
items: [{
id: 'dataList',

xtype:
'list',
store: null,
itemTpl: '{name}'
}]
}

detailCard
{
id: 'listCard',
dockedItems: [{
dock : 'top',
xtype: 'toolbar',
title: ''
}]
}

3 Model the data
http://api.yelp.com/business_review_search
?ywsid=YELP_KEY
&term=BUSINESS_TYPE
&location=CITY

"businesses": [
{
"rating_img_url" : "http://media4.px.yelpcdn.com/...",
"country_code" : "US",
"id" : "BHpAlynD9dIGIaQDRqHCTA",
"is_closed" : false,
"city" : "Brooklyn",
"mobile_url" : "http://mobile.yelp.com/biz/...",
"review_count" : 50,
"zip" : "11231",
"state" : "NY",
"latitude" : 40.675758,
"address1" : "253 Conover St",
"address2" : "",
"address3" : "",
"phone" : "7186258211",
"state_code" : "NY",
"categories": [
...",
],
...

index.html
<script type="text/javascript">
YELP_KEY = 'G3HueY_I5a8WZX-‐_bFo3Mw';
DEFAULT_CITY = 'New York';
BUSINESS_TYPE = 'Bars';
</script>

app.js
Ext.regModel("Business", {
fields: [
{name: "id", type: "int"},
{name: "name", type: "string"},
{name: "latitude", type: "string"},
{name: "longitude", type: "string"},
{name: "address1", type: "string"},
{name: "phone", type: "string"},
{name: "state_code", type: "string"},
{name: "mobile_url", type: "string"},
{name: "rating_img_url_small", type: "string"},
{name: "photo_url", type: "string"},
]
});

app.js
Ext.regStore("businesses", {
model: 'Business',
autoLoad: true,
proxy: {
type: 'scripttag',
url: 'http://api.yelp.com/business_review_search' +
'?ywsid=' + YELP_KEY +
'&term=' + escape(BUSINESS_TYPE) +
'&location=' + escape(city)
,
reader: {
type: 'json',
root: 'businesses'
}
},

app.js
listeners: {
'afterrender': function () {
cb.getCity(function (city) {
cb.getBusinesses(city, function (store) {
console.log(store.data.items);
});
});
}
}

app.js
getCity: function (callback) {
callback(DEFAULT_CITY);
},
getBusinesses: function (city, callback) {
Ext.regModel("Business", {...});
Ext.regStore("businesses", {
...
listeners: {
'load': function (store) {
callback(store);
}
}
})
}

app.js
var cards = this;
cards.listCard = cards.getComponent('listCard');
cards.dataList = cards.listCard.getComponent('dataList');
cards.detailCard = cards.getComponent('detailCard');
cb.getCity(function (city) {
cards.listCard.getDockedItems()[0]

.setTitle(city + ' ' + BUSINESS_TYPE);
cb.getBusinesses(city, function (store) {
cards.dataList.bindStore(store);
cards.setActiveItem(cards.listCard);
});
});

app.js
cards.setLoading(true);
...
cards.setLoading(false);

5 Attach events
A more interesting list template
‘selection’ event to switch to detail

app.js
itemTpl:
'<img class="photo" src="{photo_url}" width="40" height="40"/>' +
'{name}<br/>' +
'<img src="{rating_img_url_small}"/> ' +
'<small>{address1}</small>'

index.html
<style>
.photo {
float:left;
margin:0 8px 16px 0;
border:1px solid #ccc;
-‐webkit-‐box-‐shadow:
0 2px 4px #777;
}
</style>

app.js
listeners: {
selectionchange: function (selectionModel, records) {
if (records[0]) {
cb.cards.setActiveItem(cb.cards.detailCard);
cb.cards.detailCard.update(records[0].data);
}
}
}

6 Detail page
Template for the detail card
Back button with tap to switch back to list

app.js
styleHtmlContent: true,
cls: 'detail',
tpl: [
'<img class="photo" src="{photo_url}"
width="100" height="100"/>',
'<h2>{name}</h2>',
'<div class="info">',
'{address1}<br/>',
'<img src="{rating_img_url_small}"/>',
'</div>',
'<div class="phone x-‐button">',
'<a href="tel:{phone}">{phone}</a>',
'</div>',
'<div class="link x-‐button">',
'<a href="{mobile_url}">Read more</a>',
'</div>'
]

app.js
dockedItems: [{
dock : 'top',
xtype: 'toolbar',
title: '',
items: [{
text: 'Back',
ui: 'back',
listeners: {
tap: function () {
cb.cards.setActiveItem(
cb.cards.listCard,
{type:'slide', direction: 'right'}
);
}
}
}]
}],

index.html
.x-‐html h2 {
margin-‐bottom:0;
}
.phone, .link {
clear:both;
font-‐weight:bold;
display:block;
text-‐align:center;
margin-‐top:8px;
}

7 Add mapping
Change detail page to tabbed
Add map control
Update data on both tabs

app.js
{
id: 'detailCard',
xtype:
'tabpanel',
dockedItems: [...]
items: [
{
title: 'Contact',
tpl: [...]
},
{
title: 'Map',
xtype:
'map',
...
marker:
new google.maps.Marker()
}
]
}

index.html
<script src="http://maps.google.com/maps/api/js?sensor=true"
type="text/javascript">
</script>

app.js
{
xtype: 'map',
...
update: function (data) {
this.map.setCenter(
new google.maps.LatLng(data.latitude, data.longitude
));
this.marker.setPosition(
this.map.getCenter()
);
this.marker.setMap(this.map);
},
}

app.js
tabBar: {
dock: 'top',
ui: 'light',
layout: { pack: 'center' }
}

app.js
update: function(data) {
Ext.each(this.items.items, function(item) {
item.update(data);
});
this.getDockedItems()[0].setTitle(data.name);
}

8 Customize theme
Sass & Compass
Compile & link new theme

/* SCSS */
$blue: #3bbfce;
$margin: 16px;
.content-navigation {
border-color: $blue;
color:
darken($blue, 9%);
}
.border {
padding: $margin / 2;
margin: $margin / 2;
border-color: $blue;
}
/* CSS */
.content-navigation {
border-color: #3bbfce;
color: #2b9eab;
}
.border {
padding: 8px;
margin: 8px;
border-color: #3bbfce;
}
Variables

$> sudo gem install compass
http://rubyinstaller.org/

$> compass -v
Compass 0.11.1 (Antares)
Copyright (c) 2008-2011 Chris Eppstein
Released under the MIT License.
$> sass -v
Sass 3.1.1 (Brainy Betty)

citybars.scss
$base-‐color:
#666;
$base-‐gradient:
'glossy';
$include-‐default-‐icons:
false;
@import 'sencha-‐touch/default/all';
@include sencha-‐panel;
@include sencha-‐buttons;
@include sencha-‐tabs;
@include sencha-‐toolbar;
@include sencha-‐list;
@include sencha-‐layout;
@include sencha-‐loading-‐spinner;

$> compass compile citybars.scss
overwrite citybars.css

index.html
<link
href="theming/citybars.css"
rel="stylesheet" type="text/css"
/>

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