usergroup.php

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<?php
/**
 * @package     Joomla.Platform
 * @subpackage  Form
 *
 * @copyright   Copyright (C) 2005 - 2013 Open Source Matters, Inc. All rights reserved.
 * @license     GNU General Public License version 2 or later; see LICENSE
 */

defined('JPATH_PLATFORM') or die;

/**
 * Form Field class for the Joomla Platform.
 * Supports a nested check box field listing user groups.
 * Multiselect is available by default.
 *
 * @package     Joomla.Platform
 * @subpackage  Form
 * @since       11.1
 */
class JFormFieldUsergroup extends JFormField
{
        /**
         * The form field type.
         *
         * @var    string
         * @since  11.1
         */
        protected $type = 'Usergroup';

        /**
         * Method to get the user group field input markup.
         *
         * @return  string  The field input markup.
         *
         * @since   11.1
         */
        protected function getInput()
        {
                $options = array();
                $attr = '';

                // Initialize some field attributes.
                $attr .= !empty($this->class) ? ' class="' . $this->class . '"' : '';
                $attr .= $this->disabled ? ' disabled' : '';
                $attr .= $this->size ? ' size="' . $this->size . '"' : '';
                $attr .= $this->multiple ? ' multiple' : '';
                $attr .= $this->required ? ' required aria-required="true"' : '';
                $attr .= $this->autofocus ? ' autofocus' : '';

                // Initialize JavaScript field attributes.
                $attr .= !empty($this->onchange) ? ' onchange="' . $this->onchange . '"' : '';
                $attr .= !empty($this->onclick) ? ' onclick="' . $this->onclick . '"' : '';

                // Iterate through the children and build an array of options.
                foreach ($this->element->children() as $option)
                {
                        // Only add <option /> elements.
                        if ($option->getName() != 'option')
                        {
                                continue;
                        }

                        $disabled = (string) $option['disabled'];
                        $disabled = ($disabled == 'true' || $disabled == 'disabled' || $disabled == '1');

                        // Create a new option object based on the <option /> element.
                        $tmp = JHtml::_(
                                'select.option', (string) $option['value'], trim((string) $option), 'value', 'text',
                                $disabled
                        );

                        // Set some option attributes.
                        $tmp->class = (string) $option['class'];

                        // Set some JavaScript option attributes.
                        $tmp->onclick = (string) $option['onclick'];

                        // Add the option object to the result set.
                        $options[] = $tmp;
                }

                return JHtml::_('access.usergroup', $this->name, $this->value, $attr, $options, $this->id);
        }
}