Try debugging into the  grandTotal() function to see what its return value 
is:
get grandTotal() {
this.total_price = this.quantity * this.product_price;
this.sum += this.total_price;
console.log('sum = ', this.sum);
return this.sum;
}  

On Monday, July 20, 2020 at 5:53:28 AM UTC+7 maka...@gmail.com wrote:

> I am getting quantity and price not just when I click onSubmit but also 
> when I click on the quantity buttons. This is what my quantity buttons look 
> like:
>
> <button class="minus-btn" (click)="minus(product)" type="button" name=
> "btn">
> <img src="../assets/images/minus.svg" alt="minus" /></button>
> <input pattern="^(0|\+?[1-9]\d*)$" class="num" name="int" [value]=
> "product.nullValue" formControlName="int" ng-minlength="0" type="number">
> <button class="plus-btn" (click)="plus(product)" type="button" name="btn">
>
>
>
>

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