не отрабатывает jquery в yii2 с использованием pjax

  
 // код срабатывает на событие по клику кнопки добавления товара, удаления товара и обновления страницы, после $(document).ready(function ()  
  
 $('.value').html(function () { 
        var newhtml = $('#price_subtotal').html(); 
        return newhtml; 
    }); 
     
 // пробовал так,     
 $(document).find('#cart').addClass('open'); 
 // и так 
 $('#cart').addClass('open');

          <!-- ============================================================= SHOPPING CART DROPDOWN ============================================================= --> 
          <?php Pjax::begin(['id' => 'pjaxContent']); ?> 
          <?= Html::a("Обновить", ['site/index'], ['hidden'=>true, 'id'=>'cart_update']);?> 
            <div id="cart" class="dropdown dropdown-cart"> 
                <a href="/" class="dropdown-toggle lnk-cart" data-toggle="dropdown"> 
 
                    <div class="items-cart-inner"> 
                        <div class="total-price-basket"> 
                            <span class="lbl">Cart -</span> 
                            <span class="total-price"> 
						<span class="sign"></span> 
 
						<span class="value">0 грн.</span> 
					</span> 
                        </div> 
                        <div class="basket"> 
                            <i class="glyphicon glyphicon-shopping-cart"></i> 
                        </div> 
                        <div class="basket-item-count"><span class="count"> 
                                <?php if (!empty($_SESSION['cart_items'])) { 
                                    echo $_SESSION['cart_items']; 
                                    } else { 
                                    echo '0'; 
                                } ?> 
 
                            </span></div> 
 
                    </div> 
                </a> 
              <?php if (!empty($_SESSION['cart'])) { 
                $subtotal = 0; 
                $sum = 0; 
                ?> 
                <ul class="dropdown-menu"> 
 
                    <li> 
                      <?php foreach ($_SESSION['cart'] as $id => $item) { 
                          $sum = $item['quantity'] * $item['price']; 
                          $subtotal = $subtotal+$sum; 
                          if(isset($item['image'])) { 
                          $img_url = '../../frontend/web/uploads/'.$item['image']; 
                          } else { 
                          $img_url = ''; 
                          } 
                          ?> 
                        <div class="cart-item product-summary"> 
                            <div class="row"> 
                                <div class="col-xs-4"> 
                                    <div class="image"> 
                                        <img class="cart-img" src="<?=$img_url?>" alt=""> 
                                    </div> 
                                </div> 
                                <div class="col-xs-7"> 
 
                                    <h3 class="name"><?=$item['title']?></h3> 
                                    <div class="price"><?=$item['price']. ' грн.'?></div> 
                                </div> 
                                <div class="col-xs-1 action"> 
                                    <?= Html::a(Html::tag('i', '', ['class'=> 'fa fa-trash']).'', ['site/index', 'product_id' => $id], ['data-id'=> $id, 'class'=> 'rm_from_cart']);?> 
                                </div> 
                            </div> 
                        </div><!-- /.cart-item --> 
                        <?php } ?> 
 
                        <div class="clearfix"></div> 
                        <hr> 
 
                        <div class="clearfix cart-total"> 
                            <div class="pull-right"> 
 
                                <span class="text">Sub Total :</span> 
                                <span id="price_subtotal" class='price'><?=$subtotal . ' грн.'?></span> 
 
                            </div> 
                            <div class="clearfix"></div> 
 
                            <a href="checkout.html" class="btn btn-upper btn-primary btn-block m-t-20">Checkout</a> 
                        </div><!-- /.cart-total--> 
 
 
                    </li> 
                </ul><!-- /.dropdown-menu--> 
            </div><!-- /.dropdown-cart --> 
<?php } ?> 
          <?php Pjax::end(); ?> 
            <!-- ============================================================= SHOPPING CART DROPDOWN : END============================================================= -->