ext combox 下拉框不出现自动提示,自动选中的解决方法

看代码
复制代码代码如下:
var comboxContractType = new Ext.form.ComboBox（{
name:"logisticsId",
fieldLabel:"物流公司",
displayField:"logisticsName",
valueField:"logisticsId",
emptyText:"请选择",
width:330,
editable:true,
allowBlank:false,
mode:"local",
loadingText:"loading...",
hiddenName:"logisticsId",
//pageSize:10,
selectOnFocus: true,
triggerAction:"all",
store:comboxContractTypeStore = new Ext.data.JsonStore（{
url:"/pcms/dictionary/logistics.do？method=findLogistics",
root:"Datas",
totalProperty: "TotalRecords",
fields:[
{name:"logisticsId", mapping:"logisticsid"},
{name:"logisticsName", mapping:"shortname"}
]
}）
}）;
comboxContractTypeStore.load（{params:{start:0,limit:100}}）;

注意3点：

别设置 PageSize 属性
mode属性设置为local 本地模式
最后要手动将用到的stroe进行load操作. stroe.load（）;