Добавить свои фильтры поиска - Общие вопросы веб разработки

<?php if (!empty($this->sidebar)): ?>
	<div id="j-sidebar-container" class="span2">
		<?php echo $this->sidebar; ?>
	</div>
	<div id="j-main-container" class="span10">
<?php else : ?><div id="j-main-container">
<?php endif;?>
		<?php echo JLayoutHelper::render('joomla.searchtools.default', array('view' => $this)); ?>
.......
</div>

<field
	name="published"
	type="publishedoptions"
	label="COM_MYCOM_FILTER_PUBLISHED"
	description="COM_MYCOM_FILTER_PUBLISHED_DESC"
	onchange="this.form.submit();"
	>
	<option value="">JOPTION_SELECT_PUBLISHED</option>
</field>

<?php defined('_JEXEC') or die('Restricted access');

JFormHelper::loadFieldClass('predefinedlist');

class JFormFieldPublishedOptions extends JFormFieldPredefinedList {

	public $type = 'PublishedOptions';

	protected $predefinedOptions = array(
		'0'  => 'JPUBLISHED',
		'1'  => 'JUNPUBLISHED',
		'*'  => 'JALL',
	);
}

public function __construct($config = array()) {
        // Добавляем валидные поля для фильтров и сортировки.
        if (empty($config['filter_fields'])) {
            $config['filter_fields'] = array(
				'state', 'mc.state', 
				....
            );
        }
        parent::__construct($config);
}

protected function populateState($ordering = 'mc.title', $direction = 'asc') {
	$app = JFactory::getApplication();
		
	$published = $this->getUserStateFromRequest($this->context . '.filter.published', 'filter_published', '');
	$this->setState('filter.published', $published);

	.........

	parent::populateState($ordering, $direction);
	
}

protected function getStoreId($id = '') {
	$id .= ':' . $this->getState('filter.state');
 	......

	return parent::getStoreId($id);
}

protected function getListQuery(){
	................
	// Фильтруем по состоянию.
	$published = $this->getState('filter.state');
	if (is_numeric($published)) {
		$query->where('mc.state = ' . (int) $published);
	}
	elseif ($published === '') {
		$query->where('(mc.state = 0 OR mc.state = 1)');
	}
	...............

<field name="state" type="list" label="JSTATUS" description="JFIELD_PUBLISHED_DESC" class="chzn-color-state" filter="intval" size="1" default="0">
	<option value="1">JPUBLISHED</option>
	<option value="0">JUNPUBLISHED</option>
</field>

$published = $this->getState('filter.state');

<?php echo JHtml::_('select.options', JHtml::_('jgrid.publishedOptions', array('archived' => false, 'all' => false)), 'value', 'text', $this->state->get('filter.published'), true);?>