My jquery alert is not working.I createtwo models- MedicalBillRecover BelongsTo MedicalBill MedicalBill hasMany MedicalBillRecover.
Now i have a onchange event in jquery ajax
$('#recover_billDate_id').on('change',function(){  
    var employee_id=$('#employee_recover_bill_id').val();
    var recover_billDate=$('#recover_billDate_id').val();
    var data = 'recover_billDate='+recover_billDate+'&employee_id='+employee_id;
    var url_to_call = '';
    url_to_call = '<?php echo $this->Html->url(array("controller" => "medical_bills","action" => "render_recover_total_balance")); ?>';
      $.ajax({
          type: "GET",
          url: url_to_call,
          dataType: "json",
          data: data,
          error:function(resp){
              alert('Oops..Something went wrong');
          },
          success: function(resp){           
           $.each(resp,function(index,obj){
          alert(obj.MedicalBillRecover.recovery_payment_amount);
            });             
          }
        }); 
});
Controller:
function render_recover_total_balance(){
      $this->autoRender = false;
      Configure::write("debug",0);
      $cond = '';
      if(isset($_GET['employee_id']) && trim($_GET['employee_id']) != '') {
        $employee_id = $_GET['employee_id'];
        $recover_billDate = $_GET['recover_billDate'];
        $cond['MedicalBill.employee_personal_id'] = $employee_id;
        $cond['MedicalBill.bill_date'] = $recover_billDate;
      }
      $employees = $this->MedicalBill->find('all',array('conditions'=>$cond));
      return json_encode($employees);
    }
jquery alert is not working. when i write url as-/gramin-vikash-bank-test/medical_bills/render_recover_total_balance?employee_id=1&recover_billDate=2014-04-22.
then i get result as
[{"MedicalBill":{"id":"2","employee_personal_id":"1","nature_of_disease":"er","bill_amount":"50000.00","bill_date":"2014-04-22","sanctioned_by_bank":"3.00","sanctioned_by_insurance_co":"3.00","temporary_advance_sanctioned":"100000.00","advance_date":"2014-04-21","ailing_person":"4"},"EmployeePersonal":{"id":"1",""category":"General", Nalbari","office_id":"1","department_id":"1","designation_id":"1","current_post":"","status":"1"},"MedicalBillRecover":[{"id":"1","medical_bill_id":"2","entry_date":"2014-04-22","recovery_payment_amount":"500.00","user_id":null},{"id":"2","medical_bill_id":"2","entry_date":"2014-04-23","recovery_payment_amount":"1000.00","user_id":null}]}]
Now how can i retrieve the MedicalBillRecover.recovery_payment_amount in jquery ajax alert.
 
    