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Angular JS - Introduction


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what is angular js?, why should we use it 7 some features of Angular JS

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Angular JS - Introduction

  1. 1. HTML enhanced for web apps! ~Sagar Acharya
  2. 2. Agenda • Misunderstandings • What is angular? • SPAs • Why angular? • Features • MVC/MVVM • Directives, filters, expression • Demo • Why should we use it? • Why developer should use it? • Stats
  3. 3. Another JS Lib Lots of new learning Difficult to learn Useful for web only Used for styling purpose
  4. 4. What is ANGULARJS? • It’s not a JavaScript library (As they say). There are no functions which we can directly call and use. • It is not a DOM manipulation library like jQuery. But it uses subset of jQuery for DOM manipulation (called jqLite).
  5. 5. What is ANGULAR JS? (contd…) • Focus more on HTML side of web apps. • For MVC/MVVM design pattern • AngularJS is a Javascript MVC framework created by Google to build properly architectured and maintenable web applications. • “ANGULARJS is what HTML could have been if it had been designed for web application development.” • AngularJS extends HTML with new attributes.
  6. 6. Single Page Application (SPA) SPA Demo View View View View
  7. 7. The Challenge with SPAs DOM Manipulation History Routing Module Loading Data Binding Object Modeling Ajax/Promises Caching View Loading
  8. 8. Solution?
  9. 9. Why ANGULARJS? • Defines numerous ways to organize web application at client side. • Enhances HTML by attaching directives, custom tags, attributes, expressions, templates within HTML. • Encourage TDD • Encourage MVC/MVVM design pattern • Code Reuse • Good for Single Page Apps (SPA) • Cool Features -> Next Slide
  10. 10. Key Features of ANGULARJS ngularJS is a full-featured SPA framework Data Binding MVC Routing Templates ViewModel Views Controllers Dependency Injection Directives Testing Controllers jqLite Validation FactoriesHistory
  11. 11. MVC : Model View Controller View ControllerModel 1. Event or User Action or View Load 2. Maps to particular Model after fetching the data 3. Implement the Business Logic on response data and Bind it to View View : • Renders the Model data • Send User actions/events to controller • UI Controller: • Define Application Behavior • Maps user actions to Model • Select view for response Model: • Business Logic • Notify view changes • Application Functionality • Data in general
  12. 12. MVVM: Model View ViewModel View ViewModelModel UI Presentation LogicBusiness Logic and Data • User actions, commands • Data binding • Notifications • Data Access • Update ViewModel about change
  13. 13. What are Directives? • The directives can be placed in element names, attributes, class names, as well as comments. Directives are a way to teach HTML new tricks. • A directive is just a function which executes when the compiler encounters it in the DOM. • <input ng-model='name'> • Custom Defined Directives • <span draggable>Drag ME</span>
  14. 14. What are Directives? (contd..) <!DOCTYPE html> <html ng-app> <head> <title></title> </head> <body> <div class="container"> Name: <input type="text" ng-model="name" /> {{ name }} </div> <script src="Scripts/angular.js"></script> </body> </html> Directive Directive Data Binding Expression
  15. 15. Iterating with ng-repeat Directive <html data-ng-app=""> ... <div class="container" data-ng-init="names=['Dave','Napur','Heedy','Shriva']"> <h3>Looping with the ng-repeat Directive</h3> <ul> <li data-ng-repeat="name in names">{{ name }}</li> </ul> </div> ... </html> Iterate through names
  16. 16. Filters Angular filters format data for display to the user. {{ expression [| filter_name[:parameter_value] ... ] }} {{ uppercase_expression | uppercase }} {{ expression | filter1 | filter2 }} Can create custom filters
  17. 17. Using Filters <ul> <li data-ng-repeat="cust in customers | orderBy:'name'"> {{ | uppercase }} </li> </ul> Order customers by name property <input type="text" data-ng-model="nameText" /> <ul> <li data-ng-repeat="cust in customers | filter:nameText | orderBy:'name'"> {{ }} - {{ }}</li> </ul> Filter customers by model value
  18. 18. Expression Expressions are JavaScript-like code snippets that are usually placed in bindings such as {{ expression }} <body> 1+2={{1+2}} </body>
  19. 19. Demo
  20. 20. Why should we use Angular JS? • Bootstrap features • Directives for animation & effects for interactive UI • SPA : modern way to represent WEB APP • Compatible with mobile app development
  21. 21. Why Developer should use Angular JS? • It is developed by google. • RESTful actions (Using one line of JS you can quickly communicate with server) • Dependency Injection (DI) is a software design pattern that deals with how components get hold of their dependencies. • Provides several options for testing (TDD) • Flexibility with filters • Good documentation & resources.
  22. 22. Some Statistics! o Angular JS is 3 times faster than any external JS available till now ~Google.
  23. 23. More Statistics! (Interesting One) • GITHUB Stats: • Stars: o if you star a repository, you basically want to show your appreciation as well as keep track of repositories that you find interesting without it spamming your timeline. o In top 3 of github stars project list, only bootstrap & node js is ahead of it. o Check stars stats: o s • fork: o In software engineering, a project fork happens when developers take a legal copy of source code from one software package and start independent development on it, creating a distinct piece of software. o In top 7 of github fork project list. o Check fork stats: o s
  24. 24. Resources Documentation • AngularJS Developer Guide • AngularJS API • AngularJS Tutorial Videos • AngularJS Fundamentals In 60-ish Minutes • Introduction to Angular JS • AngularJS end-to-end web app tutorial Part I
  25. 25. Sagar Acharya