jqGrid: format cell value without changing actual (underlying) value?
{ name: 'Id', index: 'Id', editable: true, hidden: true,
     editoptions: { defaultValue: row_id,
                    dataUrl: "DataService.asmx/GetList",
                    buildSelect: function (data) {
                                 var s = '<select>';
                                 if (data && data.d) {
                                    //data is nested, so we need a few steps to get to the actual data
                                    var list = data.d;
                                    var opts = JSON.parse(list);
                                    var subList = opts.List;
                                    //loop through the data to build the options list
                                    for (var i = 0, l = subList.length; i < l; i++)
                                        {   var ri = subList[i];
                                            s += '<option value=' + ri.Id + '>' + ri.Name + '</option>';
                                        }
                                  }
                                  else {
                                     s+= "<option value=0>No data to display</option>";
                                  }
                                  return s + "</select>";
                            } ,
                      dataEvents: [
                              { type: 'change',
                                fn: function (e) {
                                        $('input#Id').val(this.value);
                                }
                              }
                              ]

                     },
       editrules:  {edithidden: true},
       edittype: 'select'