bid/module/Listings/view/listings/cart/index.phtml

<?php
/**
 * @version 7.6
 */
/* @var int $id
 * @var array                  $multiOptions
 * @var \Ppb\Db\Table\Row\Sale $sale
 */

$quantities = array();
$listingIds = array();

if (count($multiOptions) > 1) {
    ?>
    <nav class="navbar navbar-filter">
        <form class="pull-right" action="" method="get">
            <div class="form-group">
                <?php echo $this->formElement('select', 'id', $id)
                    ->setAttributes(array(
                        'class'    => 'form-control input-medium',
                        'onchange' => 'this.form.submit();'))
                    ->setMultiOptions($multiOptions)
                    ->render();
                ?>
            </div>
        </form>
    </nav>
<?php } ?>

<?php if ($id) {
    echo $this->form;
}
else {
    ?>
    <p class="text-center">
        <?php echo $this->_('The shopping cart is empty.'); ?>
    </p>
<?php } ?>