row_calculation.js

    individualPriceChange();
    totalPriceChange();

    $(".qty").change(function() {
        individualPriceChange();
        totalPriceChange();
    });

    // price calculation row
    function individualPriceChange() {
        $('.itemrow').each(function() {
            var price = $(this).find('.price').val();
            var quantity = $(this).find('.qty').val();
            var total = price * quantity;
            $(this).find('.total').val(total);
        });
    }

    // price calculation total
    function totalPriceChange() {
        var price = 0;
        $('[name="individual_total_price"]').each(function() {
            price += parseFloat($(this).val());
            $(this).parents("tbody").find('.total_price').val(price);
        });
    }

    // item select 
    $(document).on("click", ".item_select_button", function() {
        qty = $(this).parents(".col-md-4").find(".item_quantity").val();
        if (!qty || qty == 0) {
            alert("Item quantity can't be Zero");
            $(this).prop('checked', false);
        } else {
            var selected_items = [];
            $('.item_select_button:checkbox:checked').each(function() {
                item_id = $(this).parents(".col-md-4").find(".item_id").val();
                qty = $(this).parents(".col-md-4").find(".item_quantity").val();
                selected_items.push({
                    "id": item_id,
                    "qty": qty
                });
            });

            $.ajax({
                    type: 'POST',
                    url: "/wp-admin/admin-ajax.php?action=save_customer_item",
                    data: {
                        action: 'save_customer_item',
                        selected_items: selected_items,
                    },
                })
                .done(function(response) {

                })
        }
    });