event.getParam('draftValues').forEach(function(draftitem){
        if(draftitem.Quantity__c==null || draftitem.Quantity__c < 0)
        {
              var toastEvent=$A.get("e.force:showToast");
                               toastEvent.setParams({title:'Validation Error',
                                                     message:'Quantity Cannot be Blank or Less than Zero for Production Years',
                                                     key:'info_alt',
                                                     type:'error',
                                                     mode:'pester'
                                                    });
                               toastEvent.fire();
        }

    });
    helper.onSave(component,event);

}

}
                           else
                           {
                               console.log(state);
                           }
                        var updatedList = response.getReturnValue();
                        cmp.set("v.data",updatedList);
                        this.refreshDataTable(cmp);
                       });
    $A.enqueueAction(action);
}