gdayx 2013 - advanced angularjs - nicolas embleton
TRANSCRIPT
Angular.JSAdvanced Angular.JS - GDayX VN 2013
About me
Nicolas Embleton, French in Ho Chi Minh City
• 2005 - Software Engineer and System Architect, working on legacy tech stacks (C++, OpenGL, Java, ...) then quickly Web (PHP)
• 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
• 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 data-
binding that allows for the automatic synchronization of models and views. As a result, AngularJS deemphasizes DOM
manipulation and improves testability.
Angular JS quick review
• 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
• 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
• Using yeoman (excellent workflow tool)
o (sudo) npm install -g yo
o (sudo) npm install -g generator-angular
o yo angular
o bower install angular-ui
o grunt server
Now, the meat, the main features
• Templating
• Routing
• 2-ways data-binding
• Directives, services
• Dependency Injection
• Inter-components Communication
Templating• Models
o 2-way binding
o Easy property mapping
• Built-in directives
o ngView
� Where the routing happens
o ngRepeat
� Iterator
o ngIf
o 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"><!-- 1st ng-repeat level -->
<h2>{{ group.label }}</h2>
<ul>
<li ng-repeat="friend in group.friends">
<!-- 2nd ng-repeat level -->
{{ friend.name }}
</li>
</ul><!-- END: Inner ngRepeat. -->
</div><!-- END: Outer ngRepeat. -->
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
$compile(element.contents())(scope);
Templating - Routing
• Happens in ngView
• Routing is a very powerful feature
• Allows to update "pieces" of the page
• Can stream files from disk to make it truly isolated
2-ways data-binding
• Becoming more standard, thanks to frameworks like Ember.js or Angular.js
• Linking 2 fields for synchronization purpose
• Linking data to model
• Automatically updating the template as data is changed
o Arrays / Collections
o Inputs
o etc…
• Example
2-ways data-binding, example
<input type="text" ng-model="title" style="width: 90%"/>
<div ng-app="myapp">
<div ng-controller="mycontroller">
Title: {{ title }} <!-- 2-way data binding -->
<hr>
<div class="zippy" zippy-title="title"></div>
</div>
</div>
Directives
• Angular.js killer feature
• Great deal of re-usability
• Just look for directives at ngmodules.org
Restricting Directives
• "E": Element, <my-directive>
• "A": Attribute, <div my-directive>
• "C": Class, <div class="my-directive">
• "M": Comment: <!-- directive: my-directive exp -->
• Combine (e.g. "EA") for more flexibility
Communicating between directives
• Many design patterns
• The "backbonier"
o the emitter and the receiver
• A more connected example
o the directive combinations and controller sharing
Communicating between directives
app.directive('directiveA', function($rootScope){ // $rootScope = App Scope
return function(scope, element, attrs) { // scope = Current scope (ctrl)
$rootScope.$on('someEvent', function(){
// From here we can react anytime there's an event "someEvent" triggered
});
};
});
Communicating between directives
app.directive('gdayx', function() { // Creating the directive
return {
restrict: 'E', // Restricted to "element"
controller: function($scope) { // Creating the controller of the directive
$scope.what = ""; // Local data
this.is = function(what) { // 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.
});
}
}
});
Communicating between directives
// 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?
• 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
o Ebay Commerce Network
o DoubleClick (Google) - Marketing Manager & Planner
o YouTube APP on PS3
Best Practices
• Organize the code well (Captain Obvious!)
• Organize modules by feature
angular.module('users', ['utilities']);angular.module('groups', ['utilities']);angular.module('mainApp', ['users', 'groups']);
• Use the reusability as much as possible
• Use the testability as much as possible
o TDD
o BDD?
Testing, tooling
• 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?
• Google "Snapshot" famous technic
o _escaped_fragment_
o Turns this:
� http://prerender.io/getting-started#html5-pushstate
o Into this:
� http://prerender.io/getting-started?_escaped_fragment_=html5-pushstate
• prerender.io/ - Open Source project
• brombone.com/ - Commercial project
Enterprise project with Angular?
• YES
• BUT
Enterprise project with Angular?
• YES
• BUT
o Follow best practices (easier said than done)
o System Architecture is KEY to a solid system
o As "Agile" would advise, always try to go for simpler but "well-thought" "team-friendly"designs.
Enterprise project with Angular?
• An example Architecture
DB
Backend
(legacy)
Legacy Front End
Experimental Front
End
Experimental Front
End 2
Backend
(experimental)
Server-side team realm Front-End team realm
Final Words
• Angular 1.0.x is mature
• Angular 1.2+ will bring more awesomeness
o Better and Fluid Animations (js/css3)
o More flexibility and functionalities
� $interval: add a service wrapping setInterval
� Event directives: add ngCopy, ngCut, and ngPaste
� jQuery 1.10.x support
DEMO
(if time permits :)
Bootstrapped app
• Let's see a quick Angular App
• Bootstrapped from Yeoman
Where you can find me:
Author: Nicolas Embleton @: [email protected]
Presentation made for “Google Developer Day GDayX 2013 Vietnam”
You can follow me at:
• https://plus.google.com/+NicolasEmbleton
• https://twitter.com/nicolasembleton
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
o Our group is looking for Projects to mentor. If you have a project you want support for, contact me
Resources
Learning
• Learning AngularJS by the example (+60 minutes-ish training video)
• http://www.nganimate.org/
• https://github.com/angular-ui/ui-router
o It's a full "nested-view" library
• http://docs.angularjs.org/guide/dev_guide.templates.databinding
• ng-learn.org
Reusable Components
• http://ngmodules.org/
• http://www.directiv.es/