View Encapsulation in Angular

View encapsulation in Angular is a mechanism that ensures component styles are scoped to the component itself and do not affect other components. This tutorial covers the basics of view encapsulation and how to use it effectively in your Angular applications.

What is View Encapsulation?

View encapsulation in Angular provides style encapsulation to keep component styles isolated. It ensures that the styles defined for one component do not affect the styles of any other component.

Encapsulation Modes

Angular provides three encapsulation modes:

• Emulated: Emulates native shadow DOM behavior by adding unique attributes to elements. This is the default mode.
• Native: Uses the browser's native shadow DOM implementation.
• None: No encapsulation; styles are applied globally.

Example with Emulated Encapsulation (Default)

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

@Component({
  selector: 'app-example',
  template: '<div>This is an example component</div>',
  styles: ['div { color: blue; }'],
  encapsulation: ViewEncapsulation.Emulated // This is the default
})
export class ExampleComponent {}

Example with Native Encapsulation

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

@Component({
  selector: 'app-example',
  template: '<div>This is an example component</div>',
  styles: ['div { color: blue; }'],
  encapsulation: ViewEncapsulation.Native
})
export class ExampleComponent {}

Example with No Encapsulation

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

@Component({
  selector: 'app-example',
  template: '<div>This is an example component</div>',
  styles: ['div { color: blue; }'],
  encapsulation: ViewEncapsulation.None
})
export class ExampleComponent {}

Key Points

Conclusion

View encapsulation in Angular is a powerful feature that helps in maintaining style isolation between components. By understanding and using view encapsulation effectively, you can create more modular and maintainable Angular applications. Happy coding!