Ext 取得combox中的值

var
 combo 
=
 
new
 Ext.form.ComboBox({

   width:
127
,

   height:
50
,

   renderTo:
'
div_com
'
,

   mode:
'
remote
'
,

   triggerAction:
'
all
'
,

   id:
'
filiale
'
,

   name:
'
filiale
'
,

   value:
'
请选择..
'
,

   allowBlank: 
false
,

   handleHeight:
5
,

   listWidth :
150
,

   maxHeight:
100
,

   readOnly:
true
,

   valueFiled:
'
fid
'
,

   displayField:
'
title
'
,

   store:
new
 Ext.data.JsonStore({

       url: 
'
../../MyPages/Colligate/UploadFiliale.aspx?id=
'
+
encodeURI(v),

       root: 
'
data
'
,

       fields: [
'
title
'
,
'
fid
'
]

   }),

   listeners:{

       
'
select
'
:
function
(arg){

           
var
 d 
=
 arg.value;

           alert(Ext.get(
"
filiale
"
).dom.value);

           alert(Ext.getCmp(
"
filiale
"
).getValue());

       }

   }

});