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Nicolas Embleton, Advanced Angular JS

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Angular.JS is a modern Javascript MVC Framework that was built from the ground up by a team of Googlers, sponsored by Google itself. Angular.JS allows web developers a clear separation between logic …

Angular.JS is a modern Javascript MVC Framework that was built from the ground up by a team of Googlers, sponsored by Google itself. Angular.JS allows web developers a clear separation between logic and view, and greatly improves the ability to reuse the code by using things such as Directives, Services, Components.Angular.JS smart templating engine also allows to minimize the HTML code, During the presentation, you'll learn some medium-advanced usages of Angular.JS, how to use it, tips & tricks that will make your app amazing.

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  • 1. Angular.JS Advanced Angular.JS - GDayX VN 2013
  • 2. 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
  • 3. Agenda ● ● ● ● ● ● ● ● Quick Intro Bootstrapping Why Angular? Main features, and why it's awesome Best practices Testing, tooling And SEO? Final words
  • 4. 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.
  • 5. 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, ...
  • 6. Bootstrapping ● Using angular-seeds ○ ○ ○ git clone https://github.com/angular/angular-seed.git node scripts/web-server.js open http://localhost:8000/app/index.html ● Using yeoman (excellent workflow tool) ○ ○ ○ ○ ○ (sudo) npm install -g yo (sudo) npm install -g generator-angular yo angular bower install angular-ui grunt server
  • 7. Now, the meat, the main features ● ● ● ● ● ● Templating Routing 2-ways data-binding Directives Services Inter-components Communication
  • 8. Templating ● Models ○ 2-way binding ○ Easy property mapping ● Built-in directives ○ ngView ■ Where the routing happens ○ ngRepeat ■ Iterator ○ ngIf ○ ngSwitch
  • 9. 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>​
  • 10. 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. -->​
  • 11. 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>​
  • 12. 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>
  • 13. Templating - Simple ngRepeat <li ng-repeat="item in items"> Item: {{ item }} </li>
  • 14. 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>
  • 15. 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 $compile(element.contents())(scope);
  • 16. Templating - Routing ● ● ● ● Happens in ngView Routing is a very powerful feature Allows to update "pieces" of the page Can stream files from disk to make it truly isolated
  • 17. 2-ways data-binding ● ● ● ● ● Becoming more standard, thanks to frameworks like Ember.js or Angular.js Linking 2 fields for synchronization purpose Linking data to model Automatically updating the template as data is changed ○ Arrays / Collections ○ Inputs ○ etc… Example
  • 18. 2-ways data-binding, example <input type="text" ng-model="title" style="width: 90%"/> <div ng-app="myapp"> <div ng-controller="mycontroller"> Title: {{ title }} <!-- 2-way data binding --> <hr> <div class="zippy" zippy-title="title"></div> </div> </div>​
  • 19. Directives ● Angular.js killer feature ● Great deal of re-usability ● Just look for directives at ngmodules.org
  • 20. Restricting Directives ● ● ● ● ● "E": Element, <my-directive> "A": Attribute, <div my-directive> "C": Class, <div class="my-directive"> "M": Comment: <!-- directive: my-directive exp --> Combine (e.g. "EA") for more flexibility
  • 21. Communicating between directives ● Many design patterns ● The "backbonier" ○ the emitter and the receiver ● A more connected example ○ the directive combinations and controller sharing
  • 22. Communicating between directives app.directive('directiveA', function($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 }); }; });​
  • 23. Communicating between directives app.directive('gdayx', function() { // Creating the directive return { restrict: 'E', controller: function($scope) { // Restricted to "element" // 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. }); } } ​ });
  • 24. 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 } } });​
  • 25. 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 ○ Ebay Commerce Network ○ DoubleClick (Google) - Marketing Manager & Planner ○ YouTube APP on PS3
  • 26. 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 ○ TDD ○ BDD?
  • 27. Testing, tooling ● ● ● ● ● ● Yeoman ○ Super workflow tool and generator/scaffolder Batarang ○ Chrome Debugger Extension, (A must have), link Grunt ○ Task runner Bower ○ Package Manager for JS Libraries Protractor, Karma ○ Test Runner Jasmine, Mocha ○ Test Frameworks
  • 28. And SEO? ● Google "Snapshot" famous technic ○ _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
  • 29. Enterprise project with Angular? ● YES ● BUT
  • 30. Enterprise project with Angular? ● YES ● BUT ○ 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.
  • 31. Enterprise project with Angular? ● An example Architecture Backend (legacy) A/B t esting Legacy Front End ? Experimental Front End DB Backend (experimental) Server-side team realm Experimental Front End 2 Front-End team realm
  • 32. Final Words ● Angular 1.0.x is mature ● Angular 1.2+ will bring more awesomeness ○ 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
  • 33. DEMO (if time permits :)
  • 34. Bootstrapped app ● Let's see a quick Angular App ● Bootstrapped from Yeoman
  • 35. 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 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
  • 36. Resources Learning ● ● ● ● Learning AngularJS by the example (+60 minutes-ish training video) http://www.nganimate.org/ https://github.com/angular-ui/ui-router ○ It's a full "nested-view" library http://docs.angularjs.org/guide/dev_guide.templates.databinding Reusable Components ● ● http://ngmodules.org/ http://www.directiv.es/