extjs4下拉框

//extjs4下的下拉框，目前store得写在控件里面，具体原因未知
 1             xtype: 'container',
            anchor: '100%',
            layout: 'hbox',
            items: [{
                xtype: 'container',
                flex: 1,
                layout: 'anchor',
                items: [{
                    xtype: 'combo',
                    fieldLabel: '客户全称',
                    //afterLabelTextTpl: required,
                    name: 'kehqc',
                    anchor: '95%',
                    valueField: 'name',
                    displayField: 'name',
                    triggerAction: 'all',
                    queryMode: 'local',
                    //autoLoad:true,
                    //store分开写会报错,目前原因不明 
                    store: new Ext.data.Store({
                        singleton: true,
                        proxy: {
                            type: 'ajax',
                            url: 'BLL/H_suipkjBLL.aspx?action=cblist',
                            actionMethods: 'post',
                            reader: {
                                type: 'json',
                                root: 'root'
                            }
                        },
                        fields: ['name'], //不管有没有model，这个fields都必须写，而且只能写在这里，
                        //在reader里面的话会报错"reader.read is not a function"原因暂时不详
                        autoLoad: true
                    }),
                    loadingText: '正在加载数据，请稍侯……',
                    triggerAction: 'all',
                    valueField: 'name',
                    displayField: 'name',
                    listeners: {//客户和其他信息的联动
                        'select': function (combo, record, index) {
                            //alert(combo.value),
                            Ext.Ajax.request
                                     ({
                                         params: { parakehqc: combo.value }, //发送的参数
                                         url: "BLL/H_suipkjBLL.aspx?action=cblink", //请求的地址
                                         success: function (response, option) {
                                             var rlnoteinfo = response.responseText;
                                             var aryinfo = new Array();
                                             aryinfo = rlnoteinfo.split("|");
                                             fp.getForm().findField('guossh').setValue(aryinfo[0]);
                                             fp.getForm().findField('kaihyh').setValue(aryinfo[1]);
                                             fp.getForm().findField('yinhzh').setValue(aryinfo[2]);
                                             fp.getForm().findField('gongsdz').setValue(aryinfo[3]);
                                             fp.getForm().findField('lianxdh').setValue(aryinfo[4]);
                                         }
                                     });
                        }
}

//下面这些写在ext.require下面,ext.onready外面
var states = [
    { "id": "01", "name": "通路/二批" },
    { "id": "02", "name": "餐饮" },
    { "id": "03", "name": "夜场" },
    { "id": "04", "name": "商超" },
    { "id": "05", "name": "婚宴/团购" },
    { "id": "06", "name": "其他" },
    { "id": "99", "name": "不区分层面" }
    ];
function createStore() {
    // The data store holding the states; shared by each of the ComboBox examples below
    return Ext.create('Ext.data.Store', {
        autoDestroy: true,
        model: 'State',
        data: states
    });
}

//下面为combox内容
                        xtype: 'combobox',
                        id: 'cengm',
                        typeAhead: true,
                        triggerAction: 'all',
                        queryMode: 'local',
                        selectOnTab: true,
                        lazyRender: true,
                        displayField: 'name',
                        valueField: 'id',
                        store: createStore()
测试可用,使用ajax获取json暂时未测试