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  1. </div>
  2.             <span class="input-group-btn">
  3.               <button type="button" id="decrease" value="DecreaseValue" class="quantity-left-minus btn btn-success btn-number"  data-type="minus" data-field=""  (click)="decreaseValue()">
  4.                 <span class="glyphicon glyphicon-minus">-</span>
  5.               </button>
  6.           </span>
  7.           <input type="text" id="number" name="quantity"  class="form-control input-number" value="{{value}}">
  8.           <span class="input-group-btn">
  9.               <button type="button" id="increase" value="Increase Value" class="quantity-right-plus btn btn-success btn-number" data-type="plus" data-field=""  (click)="increaseValue()">
  10.                   <span class="glyphicon glyphicon-plus">+</span>
  11.               </button>
  12.           </span> </li>
  13.           <li class="list-group-item d-flex justify-content-between">
  14.             <h6 class="my-0">Total cost in Euros  </h6>
  15.             <p>{{price | currency : "€"  }}</p>
  16.           </li>
  17.      
  18. constructor(private http: HttpClient,
  19.     private route: ActivatedRoute,
  20.     private ps: ProductShopService
  21.     ) { this.value = this.ps.value,
  22.       this.price = this.ps.price}
  23.      
  24. constructor(private http: HttpClient,
  25.     private route: ActivatedRoute,
  26.     private ps: ProductShopService
  27.     ) { this.value = this.ps.value,
  28.       this.price = this.ps.price}
  29.      
  30. export class ProductShopService {
  31.   // shopping cart start
  32.   value: number  = 1;
  33.   price: number  = 20;
  34.  paypalLoad: boolean;
  35.  
  36.  
  37.  increaseValue(){
  38.    this.value= ++this.value;
  39.    this.price= 20*this.value;
  40.  }
  41.  
  42.  decreaseValue(){
  43.    if(this.value < 2 ){
  44.      this.value = 1
  45.      }else{
  46.        this.value = --this.value;
  47.        }
  48.  
  49.    //this.value= --this.value;
  50.    this.price= 20*this.value;
  51.  }
  52.   constructor() { }
  53. }
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