Types of selector in Angular

In Angular, a component's selector determines how it is used in an HTML template. There are four types of selectors:

1. Element Selector

The most common way to use a component is as an HTML element. This is done by specifying the selector as a tag name.

@Component({
selector: 'app-top-header',
templateUrl: './top-header.component.html'
})
export class TopHeaderComponent { }

Usage:

<app-top-header></app-top-header>

2. Attribute Selector

You can use a component as an attribute by wrapping the selector in square brackets.

@Component({
selector: '[app-top-header]',
templateUrl: './top-header.component.html'
})

Usage:

<div app-top-header></div>

3. Class Selector

A component can also be used as a CSS class by prefixing the selector with a dot (.).

@Component({
selector: '.app-top-header',
templateUrl: './top-header.component.html'
})

Usage:

<div class="app-top-header"></div>

4. ID Selector

Similarly, a component can be used as an ID by prefixing the selector with a hash (#).

@Component({
selector: '#app-top-header',
templateUrl: './top-header.component.html'
})

Usage:

><div id="app-top-header"></div>

Best Practices

• Generally, Angular components are used as elements.
• Attribute selectors are mainly used for directives.
• Class and ID selectors are less commonly used for components.

Understanding different types of selectors helps in creating flexible and reusable Angular components.

If you have any questions, feel free to ask. Thank you for reading!