How to Call and Integrate Delete API in Angular and Update Data in Backend

How to Call and Integrate Delete API in Angular and Update Data in Backend

Introduction:
In this documentation, we will guide you through the process of calling and integrating a Delete API in an Angular application to update data in the backend. We will provide a step-by-step explanation, along with relevant code examples.

Prerequisites:

1. Basic knowledge of Angular framework.
2. An existing Angular application set up with backend APIs for data management.

Step 1: Setting Up the Angular Service
Create a new service in your Angular application to handle API requests. Use the Angular CLI to generate the service.

bash
ng generate service data

Step 2: Implementing the Delete Method
Inside the generated service file (data.service.ts), import the required modules and inject the HttpClient service.

typescript
import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';
import { Observable } from 'rxjs';

@Injectable({
  providedIn: 'root'
})
export class DataService {
  private apiUrl = 'your_backend_api_url'; // Replace with your backend API URL

  constructor(private http: HttpClient) { }

  deleteData(id: number): Observable<any> {
    const url = `${this.apiUrl}/${id}`;
    return this.http.delete<any>(url);
  }
}

Step 3: Using the Delete Service in a Component
In the component where you want to delete data, import the DataService and inject it into the constructor.

typescript
import { Component } from '@angular/core';
import { DataService } from './data.service';

@Component({
  selector: 'app-delete-component',
  template: `
    <button (click)="onDelete(1)">Delete Data</button>
  `
})
export class DeleteComponent {
  constructor(private dataService: DataService) { }

  onDelete(id: number) {
    this.dataService.deleteData(id).subscribe(
      () => {
        console.log('Data deleted successfully');
        // Perform any additional actions upon successful deletion
      },
      (error) => {
        console.error('Error deleting data:', error);
        // Handle errors if any
      }
    );
  }
}

Explanation:

1. We create a DataService to manage API requests using the HttpClient module in Angular.
2. The deleteData(id: number) method sends a DELETE request to the specified API URL with the provided ID.
3. In the component, we import the DataService and use its deleteData() method on a button click to trigger the delete request.
4. Upon successful deletion, the subscribe() method's first callback is executed, logging a success message to the console.

Conclusion:
Following the steps and code examples provided in this documentation, you can successfully call and integrate a Delete API in your Angular application to update data in the backend. Always ensure that your backend API handles the delete request correctly and securely to maintain data integrity.