gDayX 2013 - Advanced AngularJS - Nicolas Embleton

Angular.JS
Advanced Angular.JS - GDayX VN 2013

About me
Nicolas Embleton, French in Ho Chi Minh City

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2005 - Software Engineer and System Architect, working on legacy tech stacks
(C++, OpenGL, Java, ...) then quickly Web (PHP)

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2009 - Founded a Mobile Development Company of 30 individuals
2011 - Started Datafield Startup, Co-founder, CTO
2013 - Started the Javascript Ho Chi Minh City meetup, Getting active in Startup
Vietnamese scene to support and mentor young talents

Agenda

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Quick Intro
Bootstrapping
Why Angular?
Main features, and why it's awesome
Best practices
Testing, tooling
And SEO?
Final words

Intro (quick)
From Wikipedia:

AngularJS is built around the belief that declarative programming should be used for building UIs and
wiring software components, while imperative programming is excellent for expressing business
logic. The framework adapts and extends traditional HTML to better serve dynamic content through two-way databinding that allows for the automatic synchronization of models and views. As a result, AngularJS deemphasizes DOM
manipulation and improves testability.

Angular JS quick review

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Templating
Model View Controller (MVC)
Extends HTML (very flexible)
2-ways Data-binding
Very reusable (if you follow best practices)
Improves testability (because it is reusable)
Provides routing, history, jqLite, ...

Bootstrapping

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Using angular-seeds
o git clone https://github.com/angular/angular-seed.git
o node scripts/web-server.js
o open http://localhost:8000/app/index.html

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Using yeoman (excellent workflow tool)
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(sudo) npm install -g yo
(sudo) npm install -g generator-angular
yo angular
bower install angular-ui
grunt server

Now, the meat, the main features

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Templating
Routing
2-ways data-binding
Directives, services
Dependency Injection
Inter-components Communication

Templating

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Models
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2-way binding
Easy property mapping

Built-in directives
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ngView
Where the routing happens

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ngRepeat
Iterator

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ngIf
ngSwitch

Templating - Conditional with ngIf
<div ng-repeat="message in data.messages" ng-class="message.type">
<hr>
<div ng-if="showFrom(message)">
<div>From: {{message.from.name}}</div>
</div>
<div ng-if="showCreatedBy(message)">
<div>Created by: {{message.createdBy.name}}</div>
</div>
<div ng-if="showTo(message)">
<div>To: {{message.to.name}}</div>
</div>
</div>

Templating - Nested repeat
<div ng-repeat="group in groups">
<h2>{{ group.label }}</h2>
<ul>
<li ng-repeat="friend in group.friends">

{{ friend.name }}
</li>
</ul>
</div>

Templating - Example 2 - Switch
<div ng-switch on="selection" >
<div ng-switch-when="settings">Settings Div</div>
<span ng-switch-when="home">Home Span</span>
<span ng-switch-default>default</span>
</div>

Example 2.2 - Switch with 2-way bind
<div ng-controller="Ctrl">
<select ng-model="selection" ng-options="item for item in items">
</select>
<tt>selection={{selection}}</tt>
<hr/>
<div class="animate-switch-container"
ng-switch on="selection">
<div ng-switch-when="settings">Settings Div</div>
<div ng-switch-when="home">Home Span</div>
<div ng-switch-default>default</div>
</div>
</div>

Templating - Simple ngRepeat
<li ng-repeat="item in items">
Item: {{ item }}
</li>

Templating - Complex ngRepeat
<header ng-repeat-start="item in items">
Header {{ item }}
</header>
<div class="body">
Body {{ item }}
</div>
<footer ng-repeat-end>
Footer {{ item }}
</footer>

Compiling
// compile the new DOM and link it to the current scope.
// NOTE: we only compile .childNodes so that
// we don't get into infinite loop compiling ourselves
$compile(element.contents())(scope);

Templating - Routing

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Happens in ngView
Routing is a very powerful feature
Allows to update "pieces" of the page
Can stream files from disk to make it truly isolated

2-ways data-binding
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Becoming more standard, thanks to frameworks like Ember.js or Angular.js

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Example

Linking 2 fields for synchronization purpose
Linking data to model
Automatically updating the template as data is changed
o Arrays / Collections
o Inputs
o etc…

2-ways data-binding, example
<input type="text" ng-model="title" style="width: 90%"/>
<div ng-app="myapp">
<div ng-controller="mycontroller">
Title: {{ title }} 
<hr>
<div class="zippy" zippy-title="title"></div>
</div>
</div>

Directives

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Angular.js killer feature
Great deal of re-usability
Just look for directives at ngmodules.org

Restricting Directives

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"E": Element, <my-directive>
"A": Attribute, <div my-directive>
"C": Class, <div class="my-directive">
"M": Comment: 
Combine (e.g. "EA") for more flexibility

Communicating between directives

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Many design patterns
The "backbonier"
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the emitter and the receiver

A more connected example
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the directive combinations and controller sharing

app.directive('directiveA', function($rootScope){
return function(scope, element, attrs) {

// $rootScope = App Scope
// scope = Current scope (ctrl)

$rootScope.$on('someEvent', function(){
// From here we can react anytime there's an event "someEvent" triggered
});
};
});

app.directive('gdayx', function() {

// Creating the directive

return {
restrict: 'E',

// Restricted to "element"

controller: function($scope) {
$scope.what = "";
this.is = function(what) {

// Creating the controller of the directive
// Local data

// External accessor

$scope.what = what;
}
},
link: function($scope, $element){
$element.bind("click", function() { // Binding on click
alert("GDayX is "+$scope.what); // Getting content from the Controller.
});
}
}
});

// This directive will "send" data to the first directive
app.directive('is', function() {

// Creating the directive

return {
require: "gdayx",

// Requiring the "gdayx" controller

restrict: 'A',

// Restricting to "attribute"

link: function(scope, element, attrs, gdayxCtrl) {
// gdayxCtrl from the "require: 'gdayx'"
gdayxCtrl.is(attrs.is); // Passing value to the "gdayx" controller
}
}
});

AngularJS - Why is it awesome?

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Mature, production-ready
Feature-rich
The design and what it allows
Strong support from giants like Google
A lot of solid companies are embracing it
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Ebay Commerce Network
DoubleClick (Google) - Marketing Manager & Planner
YouTube APP on PS3

Best Practices

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Organize the code well (Captain Obvious!)
Organize modules by feature
angular.module('users', ['utilities']);
angular.module('groups', ['utilities']);
angular.module('mainApp', ['users', 'groups']);

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Use the reusability as much as possible
Use the testability as much as possible
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TDD
BDD?

Testing, tooling
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Yeoman
o Super workflow tool and generator/scaffolder
Batarang
o Chrome Debugger Extension, (A must have), link
Grunt
o Task runner
Bower
o Package Manager for JS Libraries
Protractor, Karma
o Test Runner
Jasmine, Mocha
o Test Frameworks

And SEO?

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Google "Snapshot" famous technic
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_escaped_fragment_
Turns this:
http://prerender.io/getting-started#html5-pushstate
Into this:
http://prerender.io/getting-started?_escaped_fragment_=html5pushstate

prerender.io/ - Open Source project
brombone.com/ - Commercial project

Enterprise project with Angular?

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YES
BUT


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YES
BUT
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Follow best practices (easier said than done)
System Architecture is KEY to a solid system
As "Agile" would advise, always try to go for simpler but "well-thought"
"team-friendly"designs.


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An example Architecture
Legacy Front End

Backend
(legacy)

Experimental Front
End

DB
Backend
(experimental)

Server-side team realm

Experimental Front
End 2

Front-End team realm

Final Words

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Angular 1.0.x is mature
Angular 1.2+ will bring more awesomeness
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Better and Fluid Animations (js/css3)
More flexibility and functionalities
$interval: add a service wrapping setInterval
Event directives: add ngCopy, ngCut, and ngPaste
jQuery 1.10.x support

Bootstrapped app

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Let's see a quick Angular App
Bootstrapped from Yeoman

Where you can find me:
Author: Nicolas Embleton @: nicolas.embleton@gmail.com
Presentation made for “Google Developer Day GDayX 2013 Vietnam”
You can follow me at:
https://plus.google.com/+NicolasEmbleton
https://twitter.com/nicolasembleton

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And the Javascript Ho Chi Minh City Meetup:
http://meetup.com/JavaScript-Ho-Chi-Minh-City/
https://www.facebook.com/JavaScriptHCMC
https://plus.google.com/communities/116105314977285194967

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Our group is looking for Projects to mentor. If you have a project you want support for, contact me

Resources
Learning

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Learning AngularJS by the example (+60 minutes-ish training video)

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http://docs.angularjs.org/guide/dev_guide.templates.databinding

http://www.nganimate.org/
https://github.com/angular-ui/ui-router
o It's a full "nested-view" library
ng-learn.org

Reusable Components

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http://ngmodules.org/
http://www.directiv.es/

gDayX 2013 - Advanced AngularJS - Nicolas Embleton

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