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/home/develito/www/plugins/system/nnframework/fields/users.php

<?php
/**
 * @package         NoNumber Framework
 * @version         16.3.3874
 * 
 * @author          Peter van Westen <peter@nonumber.nl>
 * @link            http://www.nonumber.nl
 * @copyright       Copyright © 2016 NoNumber All Rights Reserved
 * @license         http://www.gnu.org/licenses/gpl-2.0.html GNU/GPL
 */

defined('_JEXEC') or die;

require_once dirname(__DIR__) . '/helpers/field.php';

class JFormFieldNN_Users extends NNFormField
{
	public $type = 'Users';

protected function getInput()
	{
		$this->params = $this->element->attributes();

if (!is_array($this->value))
		{
			$this->value = explode(',', $this->value);
		}

$options = $this->getUsers();

$size     = (int) $this->get('size');
		$multiple = $this->get('multiple');

require_once dirname(__DIR__) . '/helpers/html.php';

return NNHtml::selectlistsimple($options, $this->name, $this->value, $this->id, $size, $multiple);
	}

function getUsers()
	{
		$query = $this->db->getQuery(true)
			->select('COUNT(u.id)')
			->from('#__users AS u')
			->where('u.block = 0');
		$this->db->setQuery($query);
		$total = $this->db->loadResult();

if ($total > $this->max_list_count)
		{
			return -1;
		}

$query->clear('select')
			->select('u.name, u.username, u.id')
			->order('name');
		$this->db->setQuery($query);
		$list = $this->db->loadObjectList();

return $this->getOptionsByList($list, array('username', 'id'));
	}
}