app/code/core/Mage/Catalog/Block/Product/View/Options/Type/Select.php

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<?php
/**
 * Magento
 *
 * NOTICE OF LICENSE
 *
 * This source file is subject to the Open Software License (OSL 3.0)
 * that is bundled with this package in the file LICENSE.txt.
 * It is also available through the world-wide-web at this URL:
 * http://opensource.org/licenses/osl-3.0.php
 * If you did not receive a copy of the license and are unable to
 * obtain it through the world-wide-web, please send an email
 * to license@magentocommerce.com so we can send you a copy immediately.
 *
 * DISCLAIMER
 *
 * Do not edit or add to this file if you wish to upgrade Magento to newer
 * versions in the future. If you wish to customize Magento for your
 * needs please refer to http://www.magentocommerce.com for more information.
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @copyright  Copyright (c) 2008 Irubin Consulting Inc. DBA Varien (http://www.varien.com)
 * @license    http://opensource.org/licenses/osl-3.0.php  Open Software License (OSL 3.0)
 */


/**
 * Product options text type block
 *
 * @category   Mage
 * @package    Mage_Catalog
 * @author     Magento Core Team <core@magentocommerce.com>
 */
class Mage_Catalog_Block_Product_View_Options_Type_Select
    extends Mage_Catalog_Block_Product_View_Options_Abstract
{

    public function getValuesHtml()
    {
        $_option = $this->getOption();

        if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_DROP_DOWN
            || $_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_MULTIPLE) {
            $require = ($_option->getIsRequire()) ? ' required-entry' : '';
            $extraParams = '';
            $select = $this->getLayout()->createBlock('core/html_select')
                ->setData(array(
                    'id' => 'select_'.$_option->getId(),
                    'class' => $require.' product-custom-option'
                ));
            if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_DROP_DOWN) {
                $select->setName('options['.$_option->getid().']')
                    ->addOption('', $this->__('-- Please Select --'));
            } else {
                $select->setName('options['.$_option->getid().'][]');
                $select->setClass('multiselect'.$require.' product-custom-option');
            }
            foreach ($_option->getValues() as $_value) {
                $priceStr = $this->_formatPrice(array(
                    'is_percent' => ($_value->getPriceType() == 'percent') ? true : false,
                    'pricing_value' => $_value->getPrice(true)
                ), false);
                $select->addOption(
                    $_value->getOptionTypeId(),
                    $_value->getTitle() . ' ' . $priceStr . ''
                );
            }
            if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_MULTIPLE) {
                $extraParams = ' multiple="multiple"';
            }
            $select->setExtraParams('onchange="opConfig.reloadPrice()"'.$extraParams);

            return $select->getHtml();
        }

        if ($_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_RADIO
            || $_option->getType() == Mage_Catalog_Model_Product_Option::OPTION_TYPE_CHECKBOX
            ) {
            $selectHtml = '<ul id="options-'.$_option->getId().'-list" class="options-list">';
            $require = ($_option->getIsRequire()) ? ' validate-one-required-by-name' : '';
            $arraySign = '';
            switch ($_option->getType()) {
                case Mage_Catalog_Model_Product_Option::OPTION_TYPE_RADIO:
                    $type = 'radio';
                    $class = 'radio';
                    if (!$_option->getIsRequire()) {
                        $selectHtml .= '<li><input type="radio" id="options_'.$_option->getId().'" class="'.$class.' product-custom-option" name="options['.$_option->getId().']" onclick="opConfig.reloadPrice()" value="" checked="checked" /><span class="label"><label for="options_'.$_option->getId().'">' . $this->__('None') . '</label></span></li>';
                    }
                    break;
                case Mage_Catalog_Model_Product_Option::OPTION_TYPE_CHECKBOX:
                    $type = 'checkbox';
                    $class = 'checkbox';
                    $arraySign = '[]';
                    break;
            }
            $count = 1;
            foreach ($_option->getValues() as $_value) {
                $count++;
                $priceStr = $this->_formatPrice(array(
                    'is_percent' => ($_value->getPriceType() == 'percent') ? true : false,
                    'pricing_value' => $_value->getPrice(true)
                ));
                $selectHtml .= '<li>' .
                               '<input type="'.$type.'" class="'.$class.' '.$require.' product-custom-option" onclick="opConfig.reloadPrice()" name="options['.$_option->getId().']'.$arraySign.'" id="options_'.$_option->getId().'_'.$count.'" value="'.$_value->getOptionTypeId().'" />' .
                               '<span class="label"><label for="options_'.$_option->getId().'_'.$count.'">'.$_value->getTitle().' '.$priceStr.'</label></span>';
                if ($_option->getIsRequire()) {
                    $selectHtml .= '<script type="text/javascript">' .
                                    '$(\'options_'.$_option->getId().'_'.$count.'\').advaiceContainer = \'options-'.$_option->getId().'-container\';' .
                                    '$(\'options_'.$_option->getId().'_'.$count.'\').callbackFunction = \'validateOptionsCallback\';' .
                                   '</script>';
                }
                $selectHtml .= '</li>';
            }
            $selectHtml .= '</ul>';
            return $selectHtml;
        }
    }

}

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