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1、

配置combo：

{

                                columnWidth: .3,

                                layout: 'form',

                                border: false,

                                items: [{

                                    id: "txtP_Nation",

                                    name: "txtP_Nation",

                                    allowBlank: false,

                                    width: 130,

                                    fieldLabel: '民族',

                                    emptyText: '请选择民族',

                                    hiddenName: 'PM_id', //真正提交时此combo的name，请一定要注意

                                    xtype: 'combo',

                                    editable: false,

                                    store: strNation,//设置数据源

                                    displayField: 'PM_Name', //显示文本字段

                                    valueField: 'PM_id',//value值字段id

                                    mode: 'local',

                                    triggerAction: 'all',,//请设置为"all",否则默认为"query"的情况下，你选择某个值后，再此下拉时，只出现匹配选项，如果设为"all"的话，每次 下拉均显示全部选项

                                    selectOnFocus: true,

                                    typeAhead: true

                                }]

                            }

           2、数据源：

 　　　　var strNation = new Ext.data.Store({

                proxy: new Ext.data.HttpProxy(

                    {

                        url: '../form/Ala_HomeOtherPeople.ashx?cmd=GetParmater&type=nation'

                    }

                ),

                reader: new Ext.data.JsonReader(

                    { root: 'data' },

                    [

                        { name: 'PM_id', type: 'string' },//id

                        { name: 'PM_Name', type: 'string' }//名称

                    ]

                )

            });

            strNation.load();

编辑或修改数据时需要把要修改的数据显示在combo中：

  strNation.load({ callback: function () {

                    Ext.getCmp("txtP_Nation").setValue(json.P_Nation);//json.P_Nation 为数据id

                }

                });

获取combo选中的id值：

  var P_Nation = Ext.getCmp("txtP_Nation").getValue();