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Learning Angular for .NET Developers
Learning Angular for .NET Developers

Learning Angular for .NET Developers: Develop dynamic .NET web applications powered by Angular 4

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Learning Angular for .NET Developers

Angular Building Blocks - Part 1

This chapter gives you a detailed walk through the core building blocks of the Angular architecture.

In this chapter, we will cover the following topics:

  • Modules
  • Components
  • Decorators and metadata
  • Templates
  • Bindings
  • Directives
  • Dependency injection

Modules (NgModules)

A module is a single unit of implementation of distinct functionalities. Collections of such modules will be used to implement complex applications. Implementing module patterns helps you avoid global collisions of variables and methods. JavaScript encapsulates both private and public methods under a single object by implementing a modular pattern. The modular pattern achieves encapsulation using closure in JavaScript. JavaScript doesn't support access modifiers; however, the same effect can be achieved using function scopes. All Angular applications are modular in nature. We develop Angular applications by creating many modules. We develop modules to encapsulate functionalities that are independent and have one responsibility. A module exports the classes available in that module. Angular modules are called as NgModules. At least one Angular module will...

Components

AngularJS has controllers, scopes, and directives to deal with views, bind data, and respond to events by updating changes to data. In Angular, Components replaced controllers, scopes, and directives from AngularJS.

Angular, introduced components that support the object-oriented component model to write cleaner code. A component is a simple class that holds the logic of managing the associated template or view. A simple component class is given as follows:

Class FirstComponent { 
}

In a component class, we will expose properties and methods to a template or view. Component properties can provide data for a template or view and allow the user to modify property values. Component methods can be called according to user actions over the view.

The Angular component FirstComponent

As you can see, the preceding code creates a simple JavaScript class named FirstComponent...

Decorators and metadata

As you saw in the last section, we define JavaScript plain classes for a component, and we annotate it with some information to inform the Angular framework that this class is a component.

We leverage the Typescript syntax and attach the classes with metadata using the decorator feature. To make a class as a component, we add the @Component decorator, as shown in the following code:

@Component({...})
export class FirstComponent {...}

As you can see, the code snippet shows that the FirstComponent class has been decorated as a component.

Now, let's attach metadata to the FirstComponent class using the decorator syntax:

@Component({ 
selector: 'first-component',
templateUrl: 'app/first.component.html'
})
export class FirstComponent {...}

Here, we have added metadata, such as a selector and templateUrl. The selector metadata...

Templates

You will have noted that we have added inline markups for a view or template when annotating the component. We can also add a template URL isolating the view, or template markups in a separate HTML file, instead of having it as an inline view or template.

A template comprises HTML tags that provide information to Angular on rendering the components. A simple template content is given in the following lines of code. It renders the name of the book and publisher:

<div> 
The Name of the book is {{bookName}} and is published by {{pubName}}.
</div>

Inline templates

An inline template is used when there is a need to render very simple content, such as a one-liner, for example. In such cases, inline views...

Binding

The binding technique will enable you to bind data to a template and will allow users to interact with the bound data. The Angular binding framework takes care of rendering the data to a view and updating it as per user actions over the view.

The following screenshot gives you a quick glimpse of the various binding techniques in Angular. We will go through each binding technique in detail:

Various binding syntaxes

One-way binding

Binding types such as Interpolation, Property, Attribute, Class, and Style support one-way data flow from the data source (exposed from the component) to a view or template. Template markups that let the data flow from a component property or method to a template are given in the following...

Modules (NgModules)


A module is a single unit of implementation of distinct functionalities. Collections of such modules will be used to implement complex applications. Implementing module patterns helps you avoid global collisions of variables and methods. JavaScript encapsulates both private and public methods under a single object by implementing a modular pattern. The modular pattern achieves encapsulation using closure in JavaScript. JavaScript doesn't support access modifiers; however, the same effect can be achieved using function scopes. All Angular applications are modular in nature. We develop Angular applications by creating many modules. We develop modules to encapsulate functionalities that are independent and have one responsibility. A module exports the classes available in that module. Angular modules are called as NgModules. At least one Angular module will be present in any Angular application: a root module, which will represented as AppModule. AppModule is a class decorated...

Components


AngularJS has controllers, scopes, and directives to deal with views, bind data, and respond to events by updating changes to data. In Angular, Components replaced controllers, scopes, and directives from AngularJS.

Angular, introduced components that support the object-oriented component model to write cleaner code. A component is a simple class that holds the logic of managing the associated template or view. A simple component class is given as follows:

Class FirstComponent { 
} 

In a component class, we will expose properties and methods to a template or view. Component properties can provide data for a template or view and allow the user to modify property values. Component methods can be called according to user actions over the view.

The Angular component FirstComponent

As you can see, the preceding code creates a simple JavaScript class named FirstComponent. You may be wondering how a JavaScript plain class can be treated as a component and how a template can be wired up to...

Decorators and metadata


As you saw in the last section, we define JavaScript plain classes for a component, and we annotate it with some information to inform the Angular framework that this class is a component.

We leverage the Typescript syntax and attach the classes with metadata using the decorator feature. To make a class as a component, we add the @Component decorator, as shown in the following code:

@Component({...})
export class FirstComponent {...}

As you can see, the code snippet shows that the FirstComponent class has been decorated as a component.

Now, let's attach metadata to the FirstComponent class using the decorator syntax:

@Component({ 
   selector: 'first-component', 
   templateUrl: 'app/first.component.html' 
}) 
export class FirstComponent {...} 

Here, we have added metadata, such as a selector and templateUrl. The selector metadata configured in the component tells Angular to create the instance of a component when it encounters the <first-controller> markup:

<first...
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Key benefits

  • Become a more productive developer and learn to use frameworks that implement good development practices
  • Achieve advanced autocompletion, navigation, and refactoring in Angular using Typescript
  • Follow a gradual introduction to the concepts with a lot of examples and explore the evolution of a production-ready application

Description

Are you are looking for a better, more efficient, and more powerful way of building front-end web applications? Well, look no further, you have come to the right place! This book comprehensively integrates Angular version 4 into your tool belt, then runs you through all the new options you now have on hand for your web apps without bogging you down. The frameworks, tools, and libraries mentioned here will make your work productive and minimize the friction usually associated with building server-side web applications. Starting off with building blocks of Angular version 4, we gradually move into integrating TypeScript and ES6. You will get confident in building single page applications and using Angular for prototyping components. You will then move on to building web services and full-stack web application using ASP.NET WebAPI. Finally, you will learn the development process focused on rapid delivery and testability for all application layers.

Who is this book for?

If you are a .NET developer who now wants to efficiently build single-page applications using the new features that Angular 4 has to offer, then this book is for you. Familiarity of HTML, CSS, and JavaScript is assumed to get the most from this book.

What you will learn

  • Create a standalone Angular application to prototype user interfaces
  • Validate complex forms with Angular version 4 and use Bootstrap to style them
  • Build RESTful web services that work well with single-page applications
  • Use Gulp and Bower in Visual Studio to run tasks and manage JavaScript packages
  • Implement automatic validation for web service requests to reduce your boilerplate code
  • Use web services with Angular version 4 to offload and secure your application logic
  • Test your Angular version 4 and web service code to improve the quality of your software deliverables
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ISBN-13 : 9781785884283
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Table of Contents

9 Chapters
Getting Started with Angular Chevron down icon Chevron up icon
Angular Building Blocks - Part 1 Chevron down icon Chevron up icon
Angular Building Blocks - Part 2 Chevron down icon Chevron up icon
Using TypeScript with Angular Chevron down icon Chevron up icon
Creating an Angular Single-Page Application in Visual Studio Chevron down icon Chevron up icon
Creating ASP.NET Core Web API Services for Angular Chevron down icon Chevron up icon
Creating an Application Using Angular, ASP.NET MVC, and Web API in Visual Studio Chevron down icon Chevron up icon
Testing Angular Applications Chevron down icon Chevron up icon
What s New in Angular and ASP.NET Core Chevron down icon Chevron up icon

Customer reviews

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Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
(7 Ratings)
5 star 28.6%
4 star 14.3%
3 star 14.3%
2 star 14.3%
1 star 28.6%
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Vikas Kumar May 25, 2019
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good book for beginners.
Amazon Verified review Amazon
Jeffrey L. Armbruster Aug 11, 2017
Full star icon Full star icon Full star icon Full star icon Full star icon 5
Good book for .Net developers. You will also need Mastering TypeScript, Second Edition.
Amazon Verified review Amazon
Gregory A Schmidt Aug 25, 2017
Full star icon Full star icon Full star icon Full star icon Empty star icon 4
Solid foundation book for getting into Angular coming from a C#.Net development career. Definitely a beginner level book.
Amazon Verified review Amazon
Chris Jul 03, 2018
Full star icon Full star icon Full star icon Empty star icon Empty star icon 3
Solid entry level book for learning angular with a .net web dev background.In serious need of a good editor though. There's a decent handful of poorly structured sentences that fail to convey the author's intent.
Amazon Verified review Amazon
DustPixie Sep 02, 2018
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Very poor editing makes it too difficult to read
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