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AngularJS, an open-source front-end web application framework written in JavaScript, mainly maintained by Google and by a community of individuals and corporations to address many of the challenges encountered in developing single-page applications. MiskoHevery and Adam Aborns are inventors of AngularJs. But, before moving ahead with Angular, you should know what CSS, HTML, and JavaScript.

ANGULARJS'S DESIGN GOALS INCLUDE:

• To decouple DOM (Document Object Model) manipulation from application logic. The difficulty of this is dramatically affected by the way the code is structured.
• To decouple the client side of an application from the server-side. This allows development work to progress in parallel and allows for reuse of both sides.
• To provide structure for the journey of building an application: from designing the user interface, through writing the business logic, to testing.

Single PageApp Framework for JavaScript Implements client-side MVC pattern – Separation of presentation from business logic and presentation state No direct DOM manipulation, less code Support for all major browsers Supported by Google Large and fast-growing community

Basic Concepts of AngularJSTemplates – HTML with additional markup, directives, expressions,?lters... Directives – Extend HTML using ng-app, ng-bind,ng-model Filters – Filter the output: filter, orderBy, uppercase DataBinding – Bind model to view using expressions {{ }}

Directives apply special behavior to attributes or elements in HTML – Attach behavior, transform the DOM • Some directives – ng-app • Initializes the app – ng-model • Stores/updates the value of the input?eld into a variable – ng-bind • Replace the text content of the speci?ed HTML with the value of given expression

Lot of Built-in Directives• ngApp • ngClick • ngController • ngModel • ngRepeat • ngSubmit• ngDblClick • ngMouseEnter • ngMouseMove • ngMouseLeave • ngKeyDown • ngFormExpressions• Angular expressions are JavaScript-?like code snippets that are usually placed in bindings – {{ expression }}. • Valid Expressions • –{{ 1 + 2 }} • –{{ a + b }} – {{ items[index] }} • Control?ow (loops, if) are not supported! • You can use?lters to format or?lter dataFilterWith Filter, you can format or Filter the output • Formatting – currency, number, date, lowercase, uppercase • Filtering – filter, limit • Other – orderBy, json

• Controllers provide the logic behind your app. • – So use controller when you need logic behind your UI • AngularJS apps are controller by controllers • Use ng-?controller to de?ne the controller • Controller is a JavaScript Object, created by • standard JS object constructor

A controller is a JavaScript function • It contains data • It specifies the behavior • It should contain only the business logic needed for a single view.

• Module is a reusable container for different features of your app • Controllers, services, Filters, directives... • If you have a lot of controllers, you are polluting JS namespace • Modules can be loaded in any order • We can build our own Filters and directives!

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