อยาก ทราบ ส่งค่า ลงฐานข้อมูลเป็น id ..

$.each(datafield, function(key,item) { //same as for var i in x
  //   console.log(key.data);

      var field_id=$("#"+item.data+"_id");
  //  console.log(item.data+"_id");
        switch(item.type) {
         case 'combo':
             ///////////////////
            $('#FormModal').append("<tr><td><label class='control-label'>"+item.title+"</label></td>");
            $('#FormModal').append("<td><input class='form-control' id='"+item.data+"_id' name='"+item.data+"_id' value=''></td>");
                        
            $('#'+item.data+"_id").easyAutocomplete(combolist(item));
            
             break;
         case 'textfield':
             var cdata=(typeof row=='object')?row[item.data]:'';
              $('#FormModal').append("<tr><td><label class='control-label'>"+item.title+"</label></td>");
              $('#FormModal').append("<td><input type='text' class='form-control' id='"+item.data+"' name='"+item.data+"' value='"+cdata+"'></td>");
             break;
     }
          // $('#FormModal').append("<input class='form-control' id='list2'>");
           $('#FormModal').append("</tr>");
        });

  $('#btnsave').click(function () {

     // $('#FormModal').append('<input type="hidden" name="' + tablename + '_id" value="' + rowdata[tablename + "_id"] + '">');
   //console.log(JSON.stringify($('#FormModal'))); 
                    var DataEditForm = $("#FormModal").serializeArray(); //[Object, Object, Object, Object]
                       console.log(DataEditForm);
                    var SENDDATA = {}; 

                    for (var num in DataEditForm) {
                        SENDDATA[DataEditForm[num].name] = DataEditForm[num].value;
                         console.log(SENDDATA[DataEditForm[num].name]);
                    }

                    SENDDATA = JSON.stringify(SENDDATA);
                    
                    $.ajax({
                        url: '../../api/stock_adddata/' + tablename,
                        type: 'post',
                        dataType: 'json',
                        data: SENDDATA,
                        cache: false,
                        //async: false,
                        success: function (response) {
                            console.log(response);
                           
                        }
                    });
   });  

    public function AddData($table)
    {
            $Z['tables']="s_$table";    
    $request_body = file_get_contents('php://input');
    $Z['ข้อมูล']=json_decode($request_body,true);
                $result=$this->db->insert($Z['tables'],$Z['ข้อมูล']);
                if ($result){
                $X['success']=true;$X['msg']="เพิ่มข้อมูลเรียบร้อย";                    
                }
                else{
               $X['success']=false;$X['msg']="เกิดข้อผิดพลาด";     
                }
        return $this->output->set_content_type('application/json;charset=utf-8')->set_output(json_encode($X,JSON_UNESCAPED_UNICODE));               
    }