checkbox.php

См. документацию.

<?php
 
namespace Bitrix\Sale\Delivery\ExtraServices;
 
use Bitrix\Main\SystemException;
use Bitrix\Main\Localization\Loc;
 
Loc::loadMessages(__FILE__);
 
class Checkbox extends Base
{
    public function __construct($id, array $structure, $currency, $value = null, array $additionalParams = array())
    {
        $structure["PARAMS"]["ONCHANGE"] = $this->createJSOnchange($id, $structure["PARAMS"]["PRICE"] ?? 0);
        parent::__construct($id, $structure, $currency, $value, $additionalParams);
        $this->params["TYPE"] = "Y/N";
    }
 
    public static function getClassTitle()
    {
        return Loc::getMessage("DELIVERY_EXTRA_SERVICE_CHECKBOX_TITLE");
    }
 
    public function getCost()
    {
        return
            $this->value === 'Y'
                ? (float)$this->getPrice()
                : 0
        ;
    }
 
    public static function getAdminParamsName()
    {
        return Loc::getMessage("DELIVERY_EXTRA_SERVICE_CHECKBOX_PRICE");
    }
 
    public static function prepareParamsToSave(array $params): array
    {
        $params['PARAMS']['PRICE'] ??= 0.0;
        $params['PARAMS']['PRICE'] = (float)$params['PARAMS']['PRICE'];
 
        return $params;
    }
    public static function getAdminParamsControl($name, array $params, $currency = "")
    {
        $currency = (string)$currency;
 
        return
            \Bitrix\Sale\Internals\Input\Manager::getEditHtml(
                $name."[PARAMS][PRICE]",
                [
                    "TYPE" => "NUMBER"
                ],
                $params["PARAMS"]["PRICE"] ?? 0
            )
            . ($currency !== '' ? ' (' . $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' : '".$id."', 'value': this.checked, 'price': this.checked ? '".$price."' : '0'}]);";
    }

    public function getDisplayValue(): ?string
    {
        if ($this->value === 'Y')
        {
            return Loc::getMessage('DELIVERY_EXTRA_SERVICE_CHECKBOX_YES');
        }
 
        if ($this->value === 'N')
        {
            return Loc::getMessage('DELIVERY_EXTRA_SERVICE_CHECKBOX_NO');
        }
 
        return null;
    }
}