Specializations

Tuesday, September 13, 2016

Angularjs MVC architecture 


Model View Controller or MVC as it is popularly called, is a software design pattern for developing web applications. A Model View Controller pattern is made up of the following three parts −
  • Model − It is the lowest level of the pattern responsible for maintaining data.
  • View − It is responsible for displaying all or a portion of the data to the user.
  • Controller − It is a software Code that controls the interactions between the Model and View.
MVC is popular because it isolates the application logic from the user interface layer and supports separation of concerns. The controller receives all requests for the application and then works with the model to prepare any data needed by the view. The view then uses the data prepared by the controller to generate a final presentable response. The MVC abstraction can be graphically represented as follows.
AngularJS MVC

The Model

The model is responsible for managing application data. It responds to the request from view and to the instructions from controller to update itself.

The View

A presentation of data in a particular format, triggered by the controller's decision to present the data. They are script-based template systems such as JSP, ASP, PHP and very easy to integrate with AJAX technology.

The Controller

The controller responds to user input and performs interactions on the data model objects. The controller receives input, validates it, and then performs business operations that modify the state of the data model.
AngularJS is a MVC based framework. In the coming chapters, we will see how AngularJS uses MVC methodology.

What is AngularJS?

  • What is AngularJS?

    AngularJS is an open source web application framework. It was originally developed in 2009 by Misko Hevery and Adam Abrons. It is now maintained by Google. Its latest version is 1.4.3.
    Definition of AngularJS as put by its official documentation is as follows −
    AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. Angular's data binding and dependency injection eliminate much of the code you currently have to write. And it all happens within the browser, making it an ideal partner with any server technology.

    Features

    • AngularJS is a powerful JavaScript based development framework to create RICH Internet Application(RIA).
    • AngularJS provides developers options to write client side application (using JavaScript) in a clean MVC(Model View Controller) way.
    • Application written in AngularJS is cross-browser compliant. AngularJS automatically handles JavaScript code suitable for each browser.
    • AngularJS is open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0.
    Overall, AngularJS is a framework to build large scale and high performance web application while keeping them as easy-to-maintain.

    Core Features

    Following are most important core features of AngularJS −
    • Data-binding − It is the automatic synchronization of data between model and view components.
    • Scope − These are objects that refer to the model. They act as a glue between controller and view.
    • Controller − These are JavaScript functions that are bound to a particular scope.
    • Services − AngularJS come with several built-in services for example $http to make a XMLHttpRequests. These are singleton objects which are instantiated only once in app.
    • Filters − These select a subset of items from an array and returns a new array.
    • Directives − Directives are markers on DOM elements (such as elements, attributes, css, and more). These can be used to create custom HTML tags that serve as new, custom widgets. AngularJS has built-in directives (ngBind, ngModel...)
    • Templates − These are the rendered view with information from the controller and model. These can be a single file (like index.html) or multiple views in one page using "partials".
    • Routing − It is concept of switching views.
    • Model View Whatever − MVC is a design pattern for dividing an application into different parts (called Model, View and Controller), each with distinct responsibilities. AngularJS does not implement MVC in the traditional sense, but rather something closer to MVVM (Model-View-ViewModel). The Angular JS team refers it humorously as Model View Whatever.
    • Deep Linking − Deep linking allows you to encode the state of application in the URL so that it can be bookmarked. The application can then be restored from the URL to the same state.
    • Dependency Injection − AngularJS has a built-in dependency injection subsystem that helps the developer by making the application easier to develop, understand, and test.

    Concepts

    Following diagram depicts some important parts of AngularJS which we will discuss in detail in the subsequent chapters.
    AngularJS Concepts

    Advantages of AngularJS

    • AngularJS provides capability to create Single Page Application in a very clean and maintainable way.
    • AngularJS provides data binding capability to HTML thus giving user a rich and responsive experience
    • AngularJS code is unit testable.
    • AngularJS uses dependency injection and make use of separation of concerns.
    • AngularJS provides reusable components.
    • With AngularJS, developer write less code and get more functionality.
    • In AngularJS, views are pure html pages, and controllers written in JavaScript do the business processing.
    On top of everything, AngularJS applications can run on all major browsers and smart phones including Android and iOS based phones/tablets.

    Disadvantages of AngularJS

    Though AngularJS comes with lots of plus points but same time we should consider the following points −
    • Not Secure − Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure.
    • Not degradable − If your application user disables JavaScript then user will just see the basic page and nothing more.

    The AngularJS Components

    The AngularJS framework can be divided into following three major parts −
    • ng-app − This directive defines and links an AngularJS application to HTML.
    • ng-model − This directive binds the values of AngularJS application data to HTML input controls.
    • ng-bind − This directive binds the AngularJS Application data to HTML tags.

What is AngularJS?

  • What is AngularJS?

    AngularJS is an open source web application framework. It was originally developed in 2009 by Misko Hevery and Adam Abrons. It is now maintained by Google. Its latest version is 1.4.3.
    Definition of AngularJS as put by its official documentation is as follows −
    AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. Angular's data binding and dependency injection eliminate much of the code you currently have to write. And it all happens within the browser, making it an ideal partner with any server technology.

    Features

    • AngularJS is a powerful JavaScript based development framework to create RICH Internet Application(RIA).
    • AngularJS provides developers options to write client side application (using JavaScript) in a clean MVC(Model View Controller) way.
    • Application written in AngularJS is cross-browser compliant. AngularJS automatically handles JavaScript code suitable for each browser.
    • AngularJS is open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0.
    Overall, AngularJS is a framework to build large scale and high performance web application while keeping them as easy-to-maintain.

    Core Features

    Following are most important core features of AngularJS −
    • Data-binding − It is the automatic synchronization of data between model and view components.
    • Scope − These are objects that refer to the model. They act as a glue between controller and view.
    • Controller − These are JavaScript functions that are bound to a particular scope.
    • Services − AngularJS come with several built-in services for example $http to make a XMLHttpRequests. These are singleton objects which are instantiated only once in app.
    • Filters − These select a subset of items from an array and returns a new array.
    • Directives − Directives are markers on DOM elements (such as elements, attributes, css, and more). These can be used to create custom HTML tags that serve as new, custom widgets. AngularJS has built-in directives (ngBind, ngModel...)
    • Templates − These are the rendered view with information from the controller and model. These can be a single file (like index.html) or multiple views in one page using "partials".
    • Routing − It is concept of switching views.
    • Model View Whatever − MVC is a design pattern for dividing an application into different parts (called Model, View and Controller), each with distinct responsibilities. AngularJS does not implement MVC in the traditional sense, but rather something closer to MVVM (Model-View-ViewModel). The Angular JS team refers it humorously as Model View Whatever.
    • Deep Linking − Deep linking allows you to encode the state of application in the URL so that it can be bookmarked. The application can then be restored from the URL to the same state.
    • Dependency Injection − AngularJS has a built-in dependency injection subsystem that helps the developer by making the application easier to develop, understand, and test.

    Concepts

    Following diagram depicts some important parts of AngularJS which we will discuss in detail in the subsequent chapters.
    AngularJS Concepts

    Advantages of AngularJS

    • AngularJS provides capability to create Single Page Application in a very clean and maintainable way.
    • AngularJS provides data binding capability to HTML thus giving user a rich and responsive experience
    • AngularJS code is unit testable.
    • AngularJS uses dependency injection and make use of separation of concerns.
    • AngularJS provides reusable components.
    • With AngularJS, developer write less code and get more functionality.
    • In AngularJS, views are pure html pages, and controllers written in JavaScript do the business processing.
    On top of everything, AngularJS applications can run on all major browsers and smart phones including Android and iOS based phones/tablets.

    Disadvantages of AngularJS

    Though AngularJS comes with lots of plus points but same time we should consider the following points −
    • Not Secure − Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure.
    • Not degradable − If your application user disables JavaScript then user will just see the basic page and nothing more.

    The AngularJS Components

    The AngularJS framework can be divided into following three major parts −
    • ng-app − This directive defines and links an AngularJS application to HTML.
    • ng-model − This directive binds the values of AngularJS application data to HTML input controls.
    • ng-bind − This directive binds the AngularJS Application data to HTML tags.

  • What is AngularJS?

    AngularJS is an open source web application framework. It was originally developed in 2009 by Misko Hevery and Adam Abrons. It is now maintained by Google. Its latest version is 1.4.3.
    Definition of AngularJS as put by its official documentation is as follows −
    AngularJS is a structural framework for dynamic web apps. It lets you use HTML as your template language and lets you extend HTML's syntax to express your application's components clearly and succinctly. Angular's data binding and dependency injection eliminate much of the code you currently have to write. And it all happens within the browser, making it an ideal partner with any server technology.

    Features

    • AngularJS is a powerful JavaScript based development framework to create RICH Internet Application(RIA).
    • AngularJS provides developers options to write client side application (using JavaScript) in a clean MVC(Model View Controller) way.
    • Application written in AngularJS is cross-browser compliant. AngularJS automatically handles JavaScript code suitable for each browser.
    • AngularJS is open source, completely free, and used by thousands of developers around the world. It is licensed under the Apache License version 2.0.
    Overall, AngularJS is a framework to build large scale and high performance web application while keeping them as easy-to-maintain.

    Core Features

    Following are most important core features of AngularJS −
    • Data-binding − It is the automatic synchronization of data between model and view components.
    • Scope − These are objects that refer to the model. They act as a glue between controller and view.
    • Controller − These are JavaScript functions that are bound to a particular scope.
    • Services − AngularJS come with several built-in services for example $http to make a XMLHttpRequests. These are singleton objects which are instantiated only once in app.
    • Filters − These select a subset of items from an array and returns a new array.
    • Directives − Directives are markers on DOM elements (such as elements, attributes, css, and more). These can be used to create custom HTML tags that serve as new, custom widgets. AngularJS has built-in directives (ngBind, ngModel...)
    • Templates − These are the rendered view with information from the controller and model. These can be a single file (like index.html) or multiple views in one page using "partials".
    • Routing − It is concept of switching views.
    • Model View Whatever − MVC is a design pattern for dividing an application into different parts (called Model, View and Controller), each with distinct responsibilities. AngularJS does not implement MVC in the traditional sense, but rather something closer to MVVM (Model-View-ViewModel). The Angular JS team refers it humorously as Model View Whatever.
    • Deep Linking − Deep linking allows you to encode the state of application in the URL so that it can be bookmarked. The application can then be restored from the URL to the same state.
    • Dependency Injection − AngularJS has a built-in dependency injection subsystem that helps the developer by making the application easier to develop, understand, and test.

    Concepts

    Following diagram depicts some important parts of AngularJS which we will discuss in detail in the subsequent chapters.
    AngularJS Concepts

    Advantages of AngularJS

    • AngularJS provides capability to create Single Page Application in a very clean and maintainable way.
    • AngularJS provides data binding capability to HTML thus giving user a rich and responsive experience
    • AngularJS code is unit testable.
    • AngularJS uses dependency injection and make use of separation of concerns.
    • AngularJS provides reusable components.
    • With AngularJS, developer write less code and get more functionality.
    • In AngularJS, views are pure html pages, and controllers written in JavaScript do the business processing.
    On top of everything, AngularJS applications can run on all major browsers and smart phones including Android and iOS based phones/tablets.

    Disadvantages of AngularJS

    Though AngularJS comes with lots of plus points but same time we should consider the following points −
    • Not Secure − Being JavaScript only framework, application written in AngularJS are not safe. Server side authentication and authorization is must to keep an application secure.
    • Not degradable − If your application user disables JavaScript then user will just see the basic page and nothing more.

    The AngularJS Components

    The AngularJS framework can be divided into following three major parts −
    • ng-app − This directive defines and links an AngularJS application to HTML.
    • ng-model − This directive binds the values of AngularJS application data to HTML input controls.
    • ng-bind − This directive binds the AngularJS Application data to HTML tags.

Dynamic table generation in Angularjs, JSON to HTML Table using angular js

Dynamic table generation for any json data.

we can pass any json data it will. generate the table with out writing any code..

@{
    ViewBag.Title = "My details";
}

<script src="~/Scripts/js/angular.min.js"></script>
<form class="form-horizontal" ng-app="myApp" ng-controller="namesCtrl">
<fieldset>

    <legend>My Cases</legend>

       <script>
           angular.module('myApp', []).controller('namesCtrl', function ($scope) {
            
               $scope.TaskDetails = [
                  {TaskID:'1234',Region:'IN',District:'ap',Reason:'nothing'},
                  {TaskID:'1234',Region:'IN',District:'ap',Reason:'nothing'},
                  {TaskID:'1234',Region:'IN',District:'ap',Reason:'nothing'},
                  {TaskID:'1234',Region:'IN',District:'ap',Reason:'nothing'},
                  {TaskID:'1234',Region:'IN',District:'ap',Reason:'nothing'},
                  {TaskID:'1234',Region:'IN',District:'ap',Reason:'nothing'}
               ];
               $scope.orderByMe = function (x) {///  button click event
                   $scope.myOrderBy = x;
               }
           });
        </script>


       <div class="form-group">

                   
    <table  border="1">
        <thead>
            <tr>
                <td ng-repeat="(key,value) in TaskDetails [0]"> {{key}}</td>
                <td></td>
            </tr>


        </thead>
        <tbody>
            <tr ng-repeat="d in TaskDetails ">
                <td ng-repeat="(key,value) in d"> {{value}}</td>
                <td><a class="btn btn-primary" href="#"> select</a></td>
            </tr>

        </tbody>

    </table>
                </div>
    </fieldset>
    </form>