Angular Components Tutorial: A Comprehensive Guide with Examples

Angular 7 is a powerful JavaScript framework for building web applications. One of its core features is components, which are reusable and modular building blocks for creating user interfaces. In this tutorial, you’ll learn how to create Angular 7 components from scratch, along with best practices and code examples.

Prerequisites

Before we begin, make sure you have the following installed:

• Node.js and npm
• Angular CLI (npm install -g @angular/cli)

Creating a New Angular 7 Project

First, let’s create a new Angular project using the Angular CLI:

ng new my-angular-project
cd my-angular-project

Generating a New Component

Now, let’s generate a new component called “example”:

ng generate component example

This command creates a new folder named “example” within the “src/app” directory, containing all the necessary files for our component.

Anatomy of an Angular Component

An Angular component consists of four main files:

1. Component Class (example.component.ts): This file defines the TypeScript class for our component.

import { Component, OnInit } from '@angular/core';

@Component({
  selector: 'app-example',
  templateUrl: './example.component.html',
  styleUrls: ['./example.component.css']
})
export class ExampleComponent implements OnInit {

  constructor() { }

  ngOnInit(): void {
  }

}

2. Component Template (example.component.html): This file contains the HTML markup for our component.

<p>This is the example component</p>

3. Component Styles (example.component.css): This file contains the CSS styles specific to our component.

p {
  font-size: 18px;
  color: #333;
}

4. Component Unit Test (example.component.spec.ts): This file contains unit tests for our component.

Using the Component

To use the “example” component in our application, we need to add its selector (<app-example></app-example>) to any other component’s template where we want to display it.

<!-- app.component.html -->
<h1>Welcome to my Angular 7 App</h1>
<app-example></app-example>

Conclusion

Congratulations! You’ve learned how to create and use Angular 7 components. Components are the building blocks of Angular applications, allowing you to create modular and reusable UI elements.

In this tutorial, we covered:

• Creating a new Angular project
• Generating a new component
• Understanding the anatomy of an Angular component
• Using the component in our application

Now, you can continue exploring Angular 7 and building powerful web applications!

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Feel free to customize this tutorial to suit your needs, and let me know if you have any questions!