AngularJS In One Shot On C# Corner Only

Hello Friends, if you are looking for AngularJS so this article will help you out. In this article you can Learn AngularJs for Beginner to Expert Level, I found some best article List from C# Corner and arranged them according to the AngularJS content.

If you are looking for AngularJS,  this article will help you out. In this article, you can learn Angular from beginner level to expert. I have found some of the best articles from C# Corner and arranged them according to the AngularJS content. 

According to Angular's official documents, here is the list of topics that you must read and moreover, do a hands-on practice for cracking an Angular interview.

  1. Introduction
  2. Data Binding
  3. Controllers
  4. Services
  5. Scopes
  6. Dependency Injection
  7. Expressions
  8. Filters
  9. Forms
  10. Directives
  11. Components
  12. Component Router
  13. Animations
  14. Modules

Let us start learning with C# Corner’s best articles

Introduction to Angular

AngularJS is an open-source JavaScript framework developed by Google. It is a structural framework for dynamic web apps. It makes it easier to update and get information from your HTML document. It helps in writing a proper architecture along with maintainable and testable client-side code.

  • This framework is developed based on MVC (Model-View-Controller) design pattern.
  • It provides full-featured SPA (Single Page Application) framework.
  • It supports Dependency Injection.
  • It supports two-way data binding.
  • It provides routing feature.
  • Testing was designed right from the beginning so you can build robust tests.
  • For DOM manipulation jqLite is built-in which is kind of like Mini-Me of jQuery.
  • Separation of the client side of an application from the server side.
  • The AngularJS framework uses Plain Old JavaScript Objects(POJO), it doesn’t need the getter or setter functions.

For more details, follow the complete article written by Jeetendra Gund.

Data Binding

Data binding is a very powerful feature of software development technologies. Data binding is the connection bridge between View and business logic (View Model) of the application. Data binding in AngularJS is automatic synchronization between a Model and a View. When the model changes, the view is automatically updated and vice versa. AngularJS supports one-way binding as well as two-way binding.

Data Binding

Most templating systems work with one-way data binding. They merge the model component and template together into a View. When the merger occurs, the model data is bound to the View. After that, if the model changes are not automatically reflected in the View, the changes done by the user on View are not reflected in the model.

AngularJS template's module works differently. First of all, the template is compiled into the browser. During the compilation, it produces the live View that works as two-way binding; in other words, any changes made to the View are immediately reflected in the model and vice-versa.

For more details, follow the complete article by Jignesh Trivedi.

Controllers

Controllers allow you to create an isolated scope to “control” the data before it is passed to the View. Using a Controller, you are able to define an isolated scope and then control what part of your application has access to this scope; therefore, the data is bound to it. The traditional method for implementing Controllers is to inject a new scope instance using the $scope variable and then, bind data to it. You will, then, be able to access this bound data within the View where your Controller has governance.

The following example illustrates this principle.

Controllers
This method provides the simplest way to bind your data with the View. This has some additional benefits as the $scope object provides various functions available for use in your Controllers. These include some of the following. These are just few example functions available when injecting $Scope object into Controller.
  • $scope.$watch() - To watch the changes on scope properties
  • $scope.$eval() - Evaluates an expression against the scope
  • $scope.$emit() - Emit custom events
  • $scope.$on() - Listen for and act on events

For more details, follow the complete article by Tejas Trivedi. 

Services

Service in AngularJS is a function or an object that can be used to share data and the behavior across the application (controller, directives, filters, other services etc.) or we can say services in AngularJS are objects that are wired together using DI (dependency injection) and it can be used to share and organize code across the application. 

We can consider services as a singleton object because their is only one instance of a specific service available during the lifetime of the Angular application. They are instantiated by using the "$injector". Generally, they provide an interface to create a logical grouping of methods together related to a specific function.

There are the following two characteristics of AngularJS services:

  • Lazy instantiated
    AngularJS application instantiates a service component when any application component depends on it.

  • Singletons
    All components, those dependent on a service get a reference to the single instance generated by the service factory.

Structure of Idle AngularJS Application

Separation of concern is the main objective of AngularJS application. Our controller must be responsible for data binding with the view using $scope and contains some business logic. Controller does not contain any logic to fetch the data. AngularJS services manage the data fetching. In AngularJS application, each component has their own responsibilities so that each component can become more testable.

Structure of Idle AngularJS Application

AngularJS internal services

AngularJS internally provides many services that can be used in our application. All the AngularJS internal service start with $ (dollar) sign. $http, $route, $location, $window, $q, etc are useful services provided by AngularJS.

AngularJS custom services

With AngularJS application, we can define our own service and we can use them whenever required. There are many ways to create Services in AngularJS.

For more details follow the complete article written by Jignesh Trivedi.

Scope

$scope in AngularJS is an object which refers as an application model. It is object that bind view (DOM element) with the controller. In the controller, model data is accessed via $scope object. As we know, AngularJS supports MV* pattern, $scope object becomes the model of MV*. 

The $scope is a special JavaScript object. Both View and controller have access to the scope object. It can be used to communication between view and controller. Scope object contains both data and functions. Every AngularJS application have a $rootScope that is the top most scope created on DOM element which contains the ng-app directive. It can watch expressions and propagate events.

Characteristics of scope object

  • It provides the APIs to observe model (example $watch).
  • It can be nested, so that it limits access to the properties. Nested scopes are either child scope or isolated scope.
  • It provides the APIs to propagate any model changes from the outside of "Angular realm" (example $apply).
  • It provides a context against expression to be evaluated.

For more details, follow the complete article by Jignesh Trivedi.

DI (Dependency Injection)

Dependency Injection is one of the best features of AngularJS. It is a software design pattern in which objects are passed as dependencies. It helps us to remove hard-coded dependencies and makes dependencies configurable. Using Dependency Injection, we can make components maintainable, reusable and testable.

Dependency Injection is required for the following:

  • Separating the process of creation and consumption of dependencies.
  • It allows us to create an independent development of the dependencies.
  • We can change the dependencies when required.
  • It allows injecting mock object as dependencies for testing.

AngularJS provides the following components which can be injected into each other as dependencies.

For more details, follow the complete article written by Jignesh.

Expressions

Using Expressions, AngularJS binds the data to HTML at the location where expression is mentioned on the web page. It can be written inside double braces, like {{expression}}. It can also be written in a different way, i.e. ng-bind=”expression”. ng-bind maps the inner HTML to the value of an expression.

Let’s take an example of an HTML paragraph with equivalent expressions-

<p> {{ 5+5 }} </p>
OR
<p ng-bind=”5+5”></p>

As already mentioned, AngularJS resolves the expression and returns the result exactly where expression is written. They can contain literals, operators, and variables.

For more details follow the complete article written by Satyendra Mishra.

Filters

Filter is a module provided by AngularJS. If you don’t know what module is, then please read my previous article on Module and Controller in AngularJS. There are nine components of the filter which are provided by AngularJS. We can write custom as well.

  • currency
  • date
  • filter
  • json
  • limitTo
  • lowercase
  • number
  • uppercase

For more details follow the complete article written by Pramod Thakur.

Forms and validations

 Creating a form and submitting a form is the most important part of any web application. Form allows programmers to get the feedback from the user. Forms are also used to get the user information. But the important point here is that if the information submitted by the user is in the proper format or not. So, we need to check (validate) each and every field submitted by a user.

The aim of this section is to set some validations on the user input value and display an error message on the wrong input.

Explanation of validations states

  • $dirty - True if the user has already interacted with the form.
  • $error - It states the exact error.
  • $Invalid - It states that the entered value is invalid

There are many more validation states available in AngularJS.

  • $untouched
  • $touched
  • $pristine
  • $valid
  • $submitted

For more details follow the complete article by Rohit Singh.

Directives

Directives are attributes decorated on HTML elements. All directives start with the word “ng”. AngularJS has a set of built in directives which offers functionality to the application. You can also define your own directives in AngularJS

Let me explain few directives here,

  • ng-app – This directive initializes and AngularJS application.
  • ng-bind – This directive binds the content of an HTML element to application data.
  • ng-class - This directive specifies CSS classes on HTML elements.
  • ng-checked – This directive specifies if an element is checked or not.
  • ng-click – This directive specifies and expression to evaluate when and the element is being clicked.
  • ng-controller – This directive defines the controller object for an application.
  • ng-init – This directive initializes application data.
  • ng-model – This directive binds the value of HTML controls to application data.
  • ng-selected – This directive specifies the selected attribute of an element.
  • ng-repeat – This directive defines a template for each data in a collection.
  • ng-required – This directive specifies the required attribute of an element.
  • ng-show – This directive defines the show and hides HTML elements.
  • ng-submit – This directive specifies the expressions to run on onsubmit event
  • ng-value – This directive specifies the value of an input element. 

For more details follow the complete article written by Raj Kumar.

Components

As per official documents of Angular JS,

In AngularJS, a Component is a special kind of directive that uses a simpler configuration which is suitable for a component-based application structure.

This makes it easier to write an app in a way that's similar to using Web Components or using the new Angular's style of application architecture.

Advantages of Components,

  • simpler configuration than plain directives
  • promote sane defaults and best practices
  • optimized for the component-based architecture
  • writing component directives will make it easier to upgrade to Angular

When not to use Components,

  • for directives that need to perform actions in compile and pre-link functions, because they aren't available
  • when you need advanced directive definition options like priority, terminal, multi-element
  • when you want a directive that is triggered by an attribute or CSS class, rather than an element
Component Router

Routing is a core feature in AngularJS. This feature is useful in building SPA (Single Page Application) with multiple views. In SPA application, all views are different Html files and we use Routing to load different part of the application and its help to divide application logically and make it manageable. In other words, Routing helps us to divide our application in logical views and bind them with different controllers.

Component Router

In the above diagram, I have created two routes URL and each points to a specific view managed by a specific controller. In the later part of the article, we will learn how it works=s.

Introduction to ngRoute Module

This module provides routing in AngularJS application and also provides deep linking services and directives. To achieve routing in AngularJS, we need to include the library file of ngRoute.

Component of ngRoute Module

There are four main components of ngRoute module,
  • ngView
    ngView is directive and creates a new scope. It is used to load HTML templates.

  • $routeProvider
    It is used to configure routes.

  • $route
    It is used to make deep linking URLs between controllers and view. $route watches $location.url() and tries to map the path to an existing route defined by $routeProvider.

  • $routeParams
    This is Angular service which allows us to retrieve the current set of route parameters.

$routeProvider used for configuring the routes in AngularJS application. It depends on the ngRoute module. All application routes are defined via $routeProvider and it is the provider of the $route Service. It is very easy to wire up controllers, view templates and browser URL location using $route service. This service also helps us to implement deep linking that utilize the browser back and forward navigation (browser’s history).

For more details follow the complete article written by Jignesh Trivedi.

Animations

The AngularJS animation module enables us to create animations with CSS3 or JavaScript. Now we will learn how to animate an AngularJS directive using purely JavaScript so that we can create animations even for browsers without the support of CSS3, or integrate with some commonly used JavaScript animations libraries such as jQuery animate and GSAP JS. For this article, we will use jQuery as the JavaScript animations library because it's very intuitive and well known. We will integrate this library with AngularJS native directives so that we can easily get the built-in benefits of AngularJS and animate using jQuery.

First, we have to declare the animation using the animation() method; the declaration is really similar to the way in which you define an AngularJS factory. We specify the class of target elements where we want to display the animation on the first parameter of the animation method. The ngAnimate module of AngularJS checks whether there is any animation defined for the DOM manipulation event that is being triggered. It also checks for transitions, animations, and JavaScript animation callback functions. If at least one of these exists, it triggers the animations. For the JavaScript animations declaration, we define callback functions to be called when an element with the same class as defined on the animation method triggers an event like addClass. If there is a callback defined for this addClass event, it's called; otherwise, it skips the animation step.

For more details follow the complete article by Debasis Saha.

Modules

Using AngularJS Modules, you can control functionalities and behavior of AngularJS application with the help of Controllers and Directives.

These terms may create curiosity at this moment, which is really important but we'll cover Controllers and directives in other write-ups.

Let's have a look at Modules as of now.

Modules are used to define the application. Remember, AngularJS application starts from the HTML tag having AngularJS directive ng-app. This is a container for different parts of the application and application Controllers. AngularJS Controllers are always dependent on AngularJS Modules. 

For more details follow the complete article by Satyendra Mishra.

Thanks to all the readers and also to all the authors to write such a great article.