Learning Angular: Exploring Components in Angular (Part 3)

In Angular, components are the building blocks of your application. They are responsible for controlling the display logic and behavior of a specific piece of your user interface. In this tutorial, we will look at everything you need to know about components in Angular.

Creating a Component:
To create a new component in Angular, you can use the Angular CLI to generate it for you. Simply run the following command:

ng generate component myComponent

This will create a new folder named myComponent in your project directory, containing all the files needed for the component, including the component class, template, and style files.

Component Class:
The component class is the main part of your component. It contains the data, methods, and properties that control the behavior and logic of your component. Here is an example of a simple component class:

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

@Component({
  selector: 'myComponent',
  templateUrl: 'myComponent.component.html',
  styleUrls: ['myComponent.component.css']
})
export class MyComponent {
  title = 'Hello, World!';
}

In this example, we have created a new component class with a property called title that contains the value "Hello, World!".

Component Template:
The component template is the HTML markup that defines the structure of your component. You can use interpolation to bind data from your component class to your template. Here is an example of a simple component template:

<h1>{{ title }}</h1>

In this example, we have used interpolation to display the value of the title property from our component class.

Component Selector:
The selector is a CSS selector that defines how your component will be used in the HTML markup. Here is an example of a component selector:

@Component({
  selector: 'myComponent',
  templateUrl: 'myComponent.component.html',
  styleUrls: ['myComponent.component.css']
})

In this example, we have defined the selector as myComponent, which means we can use this component in our HTML markup by using the tag <myComponent></myComponent>.

Component Styling:
You can also add styling to your component by using CSS or SCSS files. The styles defined in these files will only apply to your component and will not affect other parts of your application. Here is an example of a component style file:

h1 {
  color: red;
}

In this example, we have defined a style for the <h1> element in our component template to change its color to red.

Using Components:
To use a component in your Angular application, you need to import the component class in your module file and add it to the declarations array. Here is an example of how you can use the MyComponent in your AppModule:

import { MyComponent } from './myComponent/myComponent.component';

@NgModule({
  declarations: [
    MyComponent
  ]
})
export class AppModule { }

After adding the component to the declarations array, you can now use the component in your HTML markup by using its selector. Here is an example of how you can use the MyComponent in your HTML markup:

<myComponent></myComponent>

And that’s it! You have now learned everything you need to know about components in Angular. Components are a crucial part of building Angular applications, and understanding how to create, use, and style them is essential for developing great applications. I hope this tutorial has been helpful to you in learning about components in Angular. Happy coding!