public function ajaxAvailableIssueBatchQuantityAction()
 {
     $this->_helper->layout->disableLayout();
     $stock_batch = new Model_StockBatch();
     $stock_batch->form_values['pk_id'] = $this->_request->batch;
     $stock_batch->form_values['trans_date'] = App_Controller_Functions::dateToDbFormat($this->_request->tr_date);
     $batch_expiry = $stock_batch->getBatchAvailableBalanceExpiry();
     $type = $this->_request->getParam('type', 0);
     if ($type === 'json') {
         $this->_helper->viewRenderer->setNoRender(TRUE);
         echo json_encode($batch_expiry);
     } else {
         $this->view->batch_expiry = $batch_expiry;
     }
 }