app/code/core/Mage/Adminhtml/Block/Widget/Grid/Column/Filter/Range.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_Adminhtml
 * @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)
 */

/**
 * Range grid column filter
 *
 * @category   Mage
 * @package    Mage_Adminhtml
 * @author      Magento Core Team <core@magentocommerce.com>
 */
class Mage_Adminhtml_Block_Widget_Grid_Column_Filter_Range extends Mage_Adminhtml_Block_Widget_Grid_Column_Filter_Abstract
{
    public function getHtml()
    {
        $html = '<div class="range"><div class="range-line"><span class="label">' . Mage::helper('adminhtml')->__('From').':</span> <input type="text" name="'.$this->_getHtmlName().'[from]" id="'.$this->_getHtmlId().'_from" value="'.$this->getEscapedValue('from').'" class="input-text no-changes"/></div>';
        $html .= '<div class="range-line"><span class="label">' . Mage::helper('adminhtml')->__('To').' : </span><input type="text" name="'.$this->_getHtmlName().'[to]" id="'.$this->_getHtmlId().'_to" value="'.$this->getEscapedValue('to').'" class="input-text no-changes"/></div></div>';
        return $html;
    }

    public function getValue($index=null)
    {
        if ($index) {
            return $this->getData('value', $index);
        }
        $value = $this->getData('value');
        if ((isset($value['from']) && strlen($value['from']) > 0) || (isset($value['to']) && strlen($value['to']) > 0)) {
            return $value;
        }
        return null;
    }
    

    public function getCondition()
    {
        $value = $this->getValue();
        return $value;
    }

}

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