$this->result->addSection('count', $this->$api->getUsefulCount());

$this->result->setTemplate('Путь к шаблону');

{html: null}
html: null

{
   success: true,
   html: "Содержимое ответа"
}

 $this->result->checkAjaxOutput(true); // Форсим AJAX

    function actionIndex()
    {

        if ($this->isMyPost()){
            $id = $this->url->request('id', TYPE_INTEGER);
            $help = $this->url->request('help', TYPE_STRING);
            if (!empty($id)) {
                $api = new \Comments\Model\Api();
                $api->markHelpful($id, $help);
                
            }
            if ($this->url->isAjax()) {
                $this->result->checkAjaxOutput(true); // Форсим AJAX
                $this->result->addSection('count', $this->$api->getUsefulCount());
            }
        }
        

        return $this->result;

    }

{addjs file="%comments%/vote.js"}
{foreach $commentlist as $comment}
<li {$comment->getDebugAttributes()}>
    <div class="info">
        <p class="starsSection"><span class="stars" title="{$comment->getRateText()}"><i class="mark{$comment.rate}"></i></span></p>
        <p class="date">{$comment.dateof|dateformat:"@date @time"}</p>
        <p class="name">{$comment.user_name}</p>
    </div>
<div class="comment">
        <i class="corner"></i>
        <p>{$comment.message|nl2br}</p>
            <div id="VoteMode">
                {if $success}
                    {$success}
                {/if}
                {if $error}
                    {$error}
                {/if}
    <form action="{$router->getUrl('comments-front-help')}" method="POST" class="formStyle">
        {$this_controller->myBlockIdInput()}
        <input type="hidden" name="id" value="{$comment.id}">
        <input type="submit" name="help" value="yes"/>    
        <input type="submit" name="help" value="no"/>            
    </form>
        <div id="useful">
        {$comment.useful}
        </div>
    </div>
</div>
</li>
{/foreach}

$(function() {
    $("body").on('submit', '#VoteMode form', function(){
        var $_this = $("#VoteMode");
        var data   = $(this).serialize();
        $.ajax({
            type : 'POST',
            url : $(this).attr('action'),
            data : data,
            dataType : 'json',
            beforeSend: function() {
                        $('#useful').html('<i class="fa fa-spinner fa-spin fa-fw"></i>');
            },
            success : function(response){
                $('#useful').html(response);
            }
        });
        return false;
    });
});

    function getUsefulCount() {
        
        $comment = new \Comments\Model\Orm\Comment();
        $res = \RS\Orm\Request::make()
                        ->select('useful AS count')
                        ->from($comment)
                        ->where(array('id' => $id))
                        ->exec()->fetchRow(); 

        return $res['count'];
    }

        <form action="{$router->getUrl('comments-front-del')}" method="POST" class="formStyle">
            <input type="hidden" name="id" value="{$comment.id}">
            <input type="submit" name="help" value="yes"/>
        </form>

  function actionIndex()
    {
       $id = $this->url->request('id', TYPE_INTEGER);
       $help = $this->url->request('help', TYPE_INTEGER);
        if (!empty($id)) {
            $comment = new \Comments\Model\Api();
            $comment->markHelpful($id, $help);
        }
        
        if (!$this->url->request('dialogMode', TYPE_INTEGER)) {
            $this->result->setAjaxWindowRedirect($this->url->getSavedUrl($this->controller_name.'index'));
        }
        
        return $this->result->setTemplate( 'activate.tpl' );
    }

<a href=""><span>+</span>{$comment.help_yes}</a>  
<a href=""><span>-</span>{$comment.help_yes}</a>             

$api = new \Нэйспейс\Имякласса();
$api->markHelpful(МоиАргументыЭтойФункции);

  function markHelpful($comment_id, $help)
    {
        $help = ($help == 'yes') ? 1 : -1;
        
        $vote = new Orm\Vote();
        $vote['ip'] = $_SERVER['REMOTE_ADDR'];
        $vote['comment_id'] = $comment_id;
        $vote['help'] = $help;
        $vote->replace();
        
        //Пересчитываем количество положительных и отрицательных оценок у комментария
        \RS\Orm\Request::make()
            ->update($this->obj_instance)
            ->set("help_yes = (SELECT COUNT(*) FROM ".$vote->_getTable()." WHERE comment_id = id AND help=1)")
            ->set("help_no = (SELECT COUNT(*) FROM ".$vote->_getTable()." WHERE comment_id = id AND help='-1')")
            ->set("useful = (SELECT SUM(help) FROM ".$vote->_getTable()." WHERE comment_id = id)")
            ->where(array('id' => $comment_id))
            ->exec();
    }