EXTJSComboBox中获取不到值

[qq_33643876]

var ManufacturerStore = new Ext.data.JsonStore({ //生产厂商
url : 'form/' + Ext.Scm + 'INV000/INV005.csx?tag=GetJosnnList',
fields : ["VEND_NO ", "SIMPLE_NAME"],
root : "data",
id : "VEND_NO",
baseParams : {
fields : "VEND_NO,SIMPLE_NAME",
ftypes: "auoto,auto"
},
toValue : function (v) {
if (v) {
var rec = ManufacturerStore.query("VEND_NO", v, true, true).items[0];
return rec ? rec.data.SIMPLE_NAME : v;
}
},
autoLoad: true
});
var MANUFACTURER = new ef.SComboBox({
fieldLabel: "生产厂商",
name: 'MANUFACTURER',
hiddenName: 'MAUFACTURER',
store: ManufacturerStore,
valueField: 'VEND_NO',
displayField: 'SIMPLE_NAME',
mode: 'local',
triggerAction: 'all',
listeners: {
select: function(v){
alert(v.getValue());
}
}
});
private string GetJosnnList()
{
try
{
S_VO v = new S_VO(Request);
v.Dt = DbUtil.QueryDT(@"select VEND_NO,SIMPLE_NAME from vend where steel = '8'");
return v.getJsonList(v.Fields, v.DFTypes);


}
catch
{

throw;
}
}
comboBox中在后台获取到了值 前台也获取到了值但是点击要选择的内容的时候就为空