combobox选择一个项后value值仍然时undefined - jQuery MiniUI

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="carinside.aspx.cs" Inherits="ParkManagement.entrymanage.carinside" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<script src="../scripts/boot.js"></script>
<script src="../scripts/jquery.min.js"></script>
<script src="../scripts/miniui/miniui.js"></script>
<script src="../scripts/jquery.cookie.js"></script>
<link href="../scripts/miniui/themes/default/large-mode.css" rel="stylesheet" />
<meta http-equiv="Content-Type" content="text/html; charset=utf-8"/>
<style type="text/css">
body {
width: 100%;
height: 100%;
border: 0;
margin: 0;
padding: 0;
overflow: hidden;
}
</style>
<title>设备信息</title>
</head>
<body>
<div style="width: 100%;">
<div>
<input class="mini-combobox" id="combo12" style="width:150px;" textField="text" valueField="id" emptyText="选择设备"
url="/devicemanage/combo.txt" required="true" allowInput="false" />
<input class="mini-button" id="searchbutton" style="width:100px;" Text="查询" onclick="Search()" />
</div>
<div id="datagrid1" class="mini-datagrid" style="width:700px;height:250px;"
sortField = "name";
sortOrder = "desc"; pageSize="3" idField="id" allowResize="true"
sizeList="[3,5,8,10]" >
<div property="columns">
<div type="indexcolumn" ></div>
<div id="name" field="name" width="120" headerAlign="center" allowSort="true">设备名称
<input property="editor" class="mini-textbox" style="width:100%" minwidth="100" />
</div>
<div id="device_type" field="device_type" width="100" renderer="onGenderRenderer" align="center" headerAlign="center">设备类型
<input property="editor" class="mini-textbox" style="width:100%" minwidth="100" />
</div>
<div id="carpark_id" field="carpark_id" width="100" renderer="onGenderRenderer" align="center" headerAlign="center">隶属车场
<input property="editor" class="mini-textbox" style="width:100%" minwidth="100" />
</div>
<div id="carbarm_id" field="carbarm_id" width="100" renderer="onGenderRenderer" align="center" headerAlign="center">隶属车库
<input property="editor" class="mini-textbox" style="width:100%" minwidth="100" />
</div>
<div id="is_online" field="is_online" width="100" renderer="onGenderRenderer" align="center" headerAlign="center">是否在线
<input property="editor" class="mini-textbox" style="width:100%" minwidth="100" />
</div>
</div>
</div>
</div>
<form runat="server">
<div>
</div>
</form>
<script>
mini.parse();
var search = mini.get("searchbutton");
var combo = mini.get("combo12");
var value = combo.getValue();
var grid = mini.get("datagrid1");
function Search() {
alert(combo.value);
if (combo.value == "undefined")
{
grid.setAjaxType("post");
grid.setUrl("http://localhost:39941/api/method/get_carpark_device_list?token=" + $.cookie("token"));
alert(grid.url);
grid.load();
}
else
{
alert("no");
}
}
</script>
</body>
</html>

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