What are the steps for fetching the data with Http Client & Observable Angular?
Here are the steps for fetching data with HttpClient and Observables in Angular:
1. Import necessary modules:
In your component's module file (e.g., app.module.ts), import HttpClientModule from @angular/common/http.
TypeScript
import { BrowserModule } from '@angular/platform-browser';
import { HttpClientModule } from '@angular/common/http';
// ... other imports
@NgModule({
imports: [
BrowserModule,
HttpClientModule,
// ... other modules
],
// ...
})
export class AppModule { }
2. Inject HttpClient in your component:
In your component class, inject the HttpClient service through the constructor.
TypeScript
import { Component, OnInit } from '@angular/core';
import { HttpClient } from '@angular/common/http';
@Component({
selector: 'app-my-component',
templateUrl: './my-component.component.html',
styleUrls: ['./my-component.component.css']
})
export class MyComponent implements OnInit {
data: any[];
constructor(private http: HttpClient) {}
ngOnInit(): void {
// Make the request here
}
}
3. Make the HTTP request:
Use the appropriate HTTP method (get, post, put, delete, etc.) of HttpClient to make the request to your API endpoint. The method returns an Observable.
TypeScript
ngOnInit(): void {
this.http.get<any[]>('https://api.example.com/data')
.subscribe(data => {
this.data = data;
}, error => {
console.error('Error fetching data:', error);
});
}
4. Subscribe to the Observable:
Call the subscribe method on the Observable returned by the HTTP method. This initiates the request and provides handlers for both successful and error responses.
In the success callback (first argument to subscribe), handle the received data (e.g., store it in a component property).
In the error callback (second argument to subscribe), handle any errors that occur during the request or response.
5. Display or use the data:
In your component template, use the data stored in the component property to display or manipulate it as needed.
Additional considerations:
You can customize the http.get call with options like headers, body, etc.
Use RxJS operators like map, catchError, etc. to transform or handle the data stream within the subscription.
Remember to unsubscribe from the Observable when the component is destroyed to avoid memory leaks.
For further learning, explore the official Angular documentation and examples:
I hope this helps!
Sources
1. https://github.com/MaxRukavitcyn/ClientTestTaskForIBS
2. https://mygeekssupport.com/web-development-framework-angular/
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