Explain on how to use HttpClient with an example?

Below are the steps need to be followed for the usage of HttpClient.

  1. Import HttpClient into root module:
import { HttpClientModule } from '@angular/common/http';
@NgModule({
imports: [
BrowserModule,
// import HttpClientModule after BrowserModule.
HttpClientModule,
],
......
})
export class AppModule {}
  1. Inject the HttpClient into the application: Let's create a userProfileService(userprofile.service.ts) as an example. It also defines get method of HttpClient
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
const userProfileUrl: string = 'assets/data/profile.json';
@Injectable()
export class UserProfileService {
constructor(private http: HttpClient) { }
getUserProfile() {
return this.http.get(this.userProfileUrl);
}
}
  1. Create a component for subscribing service: Let's create a component called UserProfileComponent(userprofile.component.ts) which inject UserProfileService and invokes the service method,
fetchUserProfile() {
this.userProfileService.getUserProfile()
.subscribe((data: User) => this.user = {
id: data['userId'],
name: data['firstName'],
city: data['city']
});
}

Since the above service method returns an Observable which needs to be subscribed in the component.


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Made by Michael Sakhniuk

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