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Learning Angular, Fourth Edition

You're reading from   Learning Angular, Fourth Edition A no-nonsense guide to building web applications with Angular 15

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Product type Paperback
Published in Feb 2023
Publisher Packt
ISBN-13 9781803240602
Length 446 pages
Edition 4th Edition
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Authors (2):
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Pablo Deeleman Pablo Deeleman
Author Profile Icon Pablo Deeleman
Pablo Deeleman
Aristeidis Bampakos Aristeidis Bampakos
Author Profile Icon Aristeidis Bampakos
Aristeidis Bampakos
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Table of Contents (17) Chapters Close

Preface 1. Building Your First Angular Application FREE CHAPTER 2. Introduction to TypeScript 3. Organizing Application into Modules 4. Enabling User Experience with Components 5. Enrich Applications Using Pipes and Directives 6. Managing Complex Tasks with Services 7. Being Reactive Using Observables and RxJS 8. Communicating with Data Services over HTTP 9. Navigating through Application with Routing 10. Collecting User Data with Forms 11. Introduction to Angular Material 12. Unit Test an Angular Application 13. Bringing an Application to Production 14. Handling Errors and Application Debugging 15. Other Books You May Enjoy
16. Index

Overriding providers in the injector hierarchy

We have already learned how to use the providers property in an Angular decorator:

@Component({
  selector: 'app-product-list',
  templateUrl: './product-list.component.html',
  styleUrls: ['./product-list.component.css'],
  providers: [ProductsService]
})

The preceding syntax is called class provider syntax and is shorthand for the provide object literal syntax shown below:

@Component({
  selector: 'app-product-list',
  templateUrl: './product-list.component.html',
  styleUrls: ['./product-list.component.css'],
  providers: [
    { provide: ProductsService, useClass: ProductsService }
  ]
})

The provide object literal syntax consists of two properties:

  • provide: This is the token that’s used to configure the injector. It is the actual class that consumers of the dependency inject into their constructors.
  • useClass: This is the actual...
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