product_discount[rowindex] = $('input[name="edit_discount"]').val();

if (product_type[pos] == 'standard') {
    var row_unit_operator = unit_operator[rowindex].slice(0, unit_operator[rowindex].indexOf(","));
    var row_unit_operation_value = unit_operation_value[rowindex].slice(0, unit_operation_value[rowindex].indexOf(","));
    if (row_unit_operator == '*') {
        product_price[rowindex] = $('input[name="edit_unit_price"]').val() / row_unit_operation_value;
    } else {
        product_price[rowindex] = $('input[name="edit_unit_price"]').val() * row_unit_operation_value;
    }