Angular 6

Angular 6 RESTful APIs POST/GET/PUT/ DELETE Calls Using HttpClient

Let’s start to create the RESTful Http POST/GET/PUT/ DELETE API Calls using the following steps.
1.      CREATE the app NgModule and import HttpClientModule with the help of '@angular/common/http'.
2.      CREATE CustomerComponent for GET, PUT, POST and DELETE CALLS
3.      CREATE CustomerService - A RESTful APIs is used HttpClient requests to GET, PUT, POST and DELETE data. All communication must be stateless and cacheable.
4.      Finally, IMPORT the Customer Service in your Customer Component and then call RESTful API methods as per your needs.

The following example -
app.module.ts –
import { BrowserModule } from '@angular/platform-browser';
import { NgModule } from '@angular/core';
import { HttpClientModule } from  '@angular/common/http';
import { RouterModule, Routes } from '@angular/router';

import { AppComponent } from './app.component';
import { CustomerComponent } from './customer/customer.component';

@NgModule({
  declarations: [
    AppComponent,
    CustomerComponent
  ],
  imports: [
    BrowserModule,
    HttpClientModule,
    RouterModule.forRoot([
      { path: 'customer-link', component: CustomerComponent }
    ])
  ],
  providers: [],
  bootstrap: [AppComponent]
})
export class AppModule { }

customer.component.ts -
import { Component, OnInit } from '@angular/core';
import { HttpClient, HttpHeaders } from  '@angular/common/http';
import {CustomerService} from '../api/apiservice.service';//

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

export class CustomerComponent implements OnInit {
 public postData;
 public customers;
 public baseURL ="http://localhost:55965/";
 //public customerModel;

  constructor( private _http: HttpClient, private _service: CustomerService) { }

  ngOnInit() {
    //Get Customer Load
    this._service.getCustomer(this.baseURL +"api/Values/GetCustomer")
        .subscribe(data => {
            this.customers = data;  
            //console.log(this.customers);        
      });

      //Get Cutomer model.
      // this._service.getCustomerModel(this.baseURL +"api/Values/GetCustomerData")
      //     .subscribe(data => {
      //       this.customerModel = data
      //       //console.log(this.customerModel);
      // });
}

  //Add Customer Action
  public addCustomer(){
    //Simple customer object is used for post the data using RestFul API Post Call.
    var customer = { Id:"11", name :"Anil", country: "India" }

    this._service.addCustomer(this.baseURL +"api/Values/PostEmployee", customer)
        .subscribe(data => {
          this.postData = data;
          //console.log(this.postData);
          alert(JSON.stringify(this.postData));
      });
    }
}


customer.component.html –
<p>
  Customer List
</p>
<table>
  <th>Id</th> <th>Name</th> <th> Country</th> <th>Actions</th>
  <tr *ngFor="let lst of customers; let i = index" border="1">
    <td>{{i+1}}</td><td>{{lst.name}}</td><td>{{lst.country}}</td> <td>Edit</td>
  </tr>
</table>

<br/>
<form id="addCustomerForm" name="addCustomerForm">
 Name - <input type="text"><br/>
 Contry - <input type="text"><br/>

 <button type="submit" class="btn btn-primary" (click)="addCustomer()"> Add Customer - POST REST API Call</button>
</form>

apiservice.service.ts -
import { Injectable } from '@angular/core';
import { HttpClient, HttpHeaders } from  '@angular/common/http';
import { CustomPromisify } from 'util';
import { observable } from 'rxjs';
import { catchError, map } from "rxjs/operators";

@Injectable({
  providedIn: 'root'
})
export class CustomerService {
  public httpOptions : any;

  constructor(private _http : HttpClient) {
    //Http Headers Options
    this.httpOptions = {
      headers: new HttpHeaders(
        { 'Content-Type': 'application/json; charset=utf-8',
          'BrowserToken' : 'auth_Token'})
    }
  }

  //Get Customer API CALL
  public getCustomer(baseUrl : string) {
    return this._http.get(baseUrl);
  };

  //Get Customer Model
  public getCustomerModel(baseUrl : string) {
    return this._http.get(baseUrl);
  };

  //Add Customer API call.
  public addCustomer (baseUrl : string, customer :any){
    return this._http.post(baseUrl, customer, this.httpOptions);
  }
}

apiservice.service.spec.ts –
import { TestBed, inject } from '@angular/core/testing';
import { CustomerService } from './apiservice.service';

describe('CustomerService', () => {
  beforeEach(() => {
    TestBed.configureTestingModule({
      providers: [CustomerService]
    });
  });

  it('should be created', inject([CustomerService], (service: CustomerService) => {
    expect(service).toBeTruthy();
  }));
});


The RESTful APIs example –
using System;
using System.Collections.Generic;
using Microsoft.AspNetCore.Mvc;
using Newtonsoft.Json;

namespace CoreAPI.Controllers
{
    [Produces("application/json")]
    [Route("api/Values")]
    public class ValuesController : Controller
    {
        // GET api/values
        [HttpGet]
        [Route("GetCustomer")]
        public IActionResult GetCustomer()
        {
            List<Customer> cust = new List<Customer>();
            cust.Add(new Customer { Id = "1", name = "Anil Bloggs1", country = "India" });
            cust.Add(new Customer { Id = "2", name = "Anil Bloggs2", country = "India" });
            cust.Add(new Customer { Id = "3", name = "Anil Bloggs3", country = "India" });
            cust.Add(new Customer { Id = "4", name = "Anil Bloggs4", country = "India" });

            return Json(cust);
        }

        [HttpGet]
        [Route("GetCustomerData")]
        public IActionResult GetCustomerData()
        {
            Customer cust = new Customer();
            cust.name = "Anil";
            return Json(cust);
        }

        // POST api/values
        [HttpPost]
        [Route("PostEmployee")]
        //public IActionResult Post([FromBody]Newtonsoft.Json.Linq.JObject customer) - Way 1
        //public IActionResult Post([FromBody]dynamic customer) - Way 2
        public IActionResult PostEmployee([FromBody]Object customer)
        {
            //if : [FromBody]Newtonsoft.Json.Linq.JObject customer - Way 1
            //var obj =  JsonConvert.DeserializeObject<Customer>(customer.ToString());

            //if [FromBody]dynamic customer - Way 2
            //var obj =  JsonConvert.DeserializeObject<Customer>(customer.ToString());

            //if [FromBody]Object customer - - Way 3
            var obj = JsonConvert.DeserializeObject<Customer>(customer.ToString());

            //TODO your business logic - insert in the database.

            return Json(obj);
        }
    }

    //Customer property class
    public class Customer
    {
        public string Id { get; set; }
        public string name { get; set; }
        public string country { get; set; }
    }
}

Let’s explore in detail – Angular 6 and Angular 7
ANIL SINGH

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