quantity.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Delivery\ExtraServices;
 
use Bitrix\Main\Localization\Loc;
 
Loc::loadMessages(__FILE__);
 
class Quantity extends Base
{
    public function __construct($id, array $structure, $currency, $value = null, array $additionalParams = array())
    {
        if(isset($structure["PARAMS"]["PRICE"]))
            $structure["PARAMS"]["ONCHANGE"] = $this->createJSOnchange($id, $structure["PARAMS"]["PRICE"]);
 
        parent::__construct($id, $structure, $currency, $value);
        $this->params["TYPE"] = "STRING";
    }
 
    public static function getClassTitle()
    {
        return Loc::getMessage("DELIVERY_EXTRA_SERVICE_QUANTITY_TITLE");
    }
 
    public function setValue($value)
    {
        $this->value = intval($value) >= 0 ? intval($value) : 0;
    }
 
    public function getCost()
    {
        return floatval($this->getPrice())*floatval($this->value);
    }
 
    public static function getAdminParamsName()
    {
        return Loc::getMessage("DELIVERY_EXTRA_SERVICE_QUANTITY_PRICE");
    }
 
    public static function getAdminParamsControl($name, array $params = array(), $currency = "")
    {
        if(!empty($params["PARAMS"]["PRICE"]))
            $price = roundEx(floatval($params["PARAMS"]["PRICE"]), SALE_VALUE_PRECISION);
        else
            $price = 0;
 
        return '<input type="text" name="'.$name.'[PARAMS][PRICE]" value="'.$price.'">'.($currency <> '' ? " (".htmlspecialcharsbx($currency).")" : "");
    }
 
    public function setOperatingCurrency($currency)
    {
        $this->params["ONCHANGE"] = $this->createJSOnchange($this->id, $this->getPrice());
        parent::setOperatingCurrency($currency);
    }
 
    protected function createJSOnchange($id, $price)
    {
        $price = roundEx(floatval($price), SALE_VALUE_PRECISION);
        return "BX.onCustomEvent('onDeliveryExtraServiceValueChange', [{'id' : '".$id."', 'value': this.value, 'price': this.value*parseFloat('".$price."')}]);";
    }
}