3. Agenda
1. What is AngularJS?
2. Core features
3. It's working
4. How to start working with it?
5. Controller
6. AngularJS directives
7. Expression
8. Forms
9. Services
5. What's AngularJS?
AngularJS (commonly referred to as "Angular") is an
open-source web application framework maintained by
Google to address many of the challenges encountered
in developing single-page applications. It aims to simplify
both the development and the testing of such
applications by providing a framework for client-side
model–view–controller (MVC) – As per Wikipedia.
6. Core features
1.Two way data binding
2.Templates
3.Model view controller(MVC)
4.Dependency Injection
8. Templates
In AngularJS, a template is just plain-old-HTML. The
HTML vocabulary is extended, to contain instructions
on how the model should be projected into the view.
The HTML templates are parsed by the browser into
the DOM. The DOM then becomes the input to the
AngularJS compiler. AngularJS traverses the DOM
template for rendering instructions, which are called
directives. Collectively, the directives are responsible
for setting up the data-binding for your application
view.
14. AngularJS Directives
ng-app: Declares an element as root element
ng-bind: Automatically changes the text of HTML element
ng-model: Similar to ng-bind but allow two way binding
ng-class: Allow class attribute to be dynaically loaded
ng-controller: Specifies javascript controller class
ng-repeat: Instantiate an element once per item from a collection
ng-show & ng-hide: Conditionally show or hide an element
ng-switch: Conditionally instantiate one template from a list
ng-view: Rendering templates driven by specific controllers
ng-if: Simple if-else attribute that we know from ever!
16. Angular Form Properties $valid, $invalid, $pristine, $dirty
Angular also provides classes on the form and its inputs so that
you can style each state accordingly.
17. AngularJS Services
In Angular a service is a function or an object and is used to share data
and/or behavior across controllers, directives, filters, other services etc. A
service is treated as a singleton, that is there is only one instance of a
specific service available during the whole lifetime of the Angular
application. This is different from e.g. a controller of which many
instances can be created.
The easiest way is to use the Service recipe of an angular module.
var app = angular.module('app', []);
app.service('some-service', function(){…});
Other two methods/way to create service are:
1. The factory recipe
2.The provider recipe
21. AngularJS Dependency Injection
AngularJS has a built-in dependency injection subsystem that
helps the developer by making the application easier to develop,
understand, and test.
Dependency Injection (DI) allows you to ask for your
dependencies, rather than having to go look for them or make
them yourself. Think of it as a way of saying "Hey I need X', and
the DI is responsible for creating and providing it for you.
To gain access to core AngularJS services, it is simply a matter of
adding that service as a parameter; AngularJS will detect that you
need that service and provide an instance for you.
22. AngularJS Filters
Angular exposes a simple API for creating a filter. Just as you
would declare a controller with app.controller(‘myCtrl',
function(){});, you can create a new filter by appending
.filter(‘filterName', function(){}) to your Angular app.
23. AngularJS Advantages
Super fast development
Makes developing SPA easy
Awesome performance
Make apps scalable
Data binding and DOM manipulation
24. AngularJS Disadvantages
Good for I/O driven apps only(not games)
Angular is big and complicated. With multiple ways to do
the same thing it is hard to tell which way is better for
particular task.
The lifecycle of Angular application is complex, and to
master it you really need to read the code.
