Elep

<?php
/*------------------------------------------------------------------------
# Copyright (C) 2005-2012 WebxSolution Ltd. All Rights Reserved.
# @license - GPLv2.0
# Author: WebxSolution Ltd
# Websites:  http://www.webxsolution.com
# Terms of Use: An extension that is derived from the JoomlaCK editor will only be allowed under the following conditions: http://joomlackeditor.com/terms-of-use
# ------------------------------------------------------------------------*/

defined( '_JEXEC' ) or die;
defined('JPATH_PLATFORM') or die;

jimport('joomla.form.formfield');
jimport('joomla.form.helper');
JFormHelper::loadFieldClass('list');

/**
 * Supports an HTML select list of files
 *
 * @package     Joomla.Platform
 * @subpackage  Form
 * @since       11.1
 */
class JFormFieldWindowfeaturesList extends JFormFieldList
{

/**
	 * The form field type.
	 *
	 * @var    string
	 * @since  11.1
	 */
	public $type = 'WindowfeaturesList';

/**
	 * Method to get the list of files for the field options.
	 * Specify the target directory with a directory attribute
	 * Attributes allow an exclude mask and stripping of extensions from file name.
	 * Default attribute may optionally be set to null (no file) or -1 (use a default).
	 *
	 * @return  array  The field option objects.
	 *
	 * @since   11.1
	 */

protected function getInput()
	{
        $value = $this->value;
        
        if(is_string($value) && preg_match('/^\[.*\]$/',$value))
        {
            
            $value = str_replace('\'','"',$value);
            $this->value = json_decode($value); 
        }

$this->multiple = true;
        
        $this->name .= '[]';
        
        return parent::getInput();
    }
 }