ext combox 下拉框不出现自动提示,自动选中的解决方法

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();