easyui datagrid中关联combox

datagrid中列上关联combobox
{ field: 'SysCode', title: '系统代码', width: 150, align: 'left', editor: {
                            type: 'combobox',
                            options:
                                {
                                    valueField: 'id',
                                    textField: '要显示的字段名',
                                    url: '/Sys/SearchCodeInFunctionModel',
                                }
                        }

<th data-options="field:'fShipCom',width:100,align:'center',

                                    formatter:function(value,row){

                                        return row.fShipCom;

                                    },

                                    editor:{

                                        type:'combobox',

                                        options:{

                                            valueField:'fShipCom',

                                            textField:'fShipCom',

                                            url:'ShipPlan.ashx?act=getShipCom',

                                             onChange :function(value){

                                              

                                                var tr = $(this).closest('tr.datagrid-row');

                                                 var idx = parseInt(tr.attr('datagrid-row-index'));

                                                 var ed = $('#dg').datagrid('getEditor',{index:0, field:'fShipName'});

                                                alert(idx);

                                                alert(value);

 

                                                $(ed.target).combobox('reload','ShipPlan.ashx?act=getShipName&fshipCom='+escape(value));

                                               

                                                 

                                                },

                                            required:true

                                        }

                                    }">船公司</th>