二级联动菜单的js实现代码一例

var cities=new Array();
cities['00000000-0000-0000-0000-000000000000']=[['028db215-8bd7-45ab-bbaa-1efa175c35ca','长春'],['bcb32195-2a46-4cd1-9472-6383e8fa55cc','沈阳']];

var schools=new Array();
schools['028db215-8bd7-45ab-bbaa-1efa175c35ca']=[['5f22403a-7a59-4b7f-b62d-9451298cbd00','长春1'],['e8f0f665-9a9a-4c44-83fd-598e8a28dcd7','长春2']];
schools['bcb32195-2a46-4cd1-9472-6383e8fa55cc']=[['4a743dbf-1fdc-4907-a44e-8d169d715664','沈阳1']];

//根据父编号获取相应的子数据，并显示在obj控件中
//type=0 城市，1学校
//pid 父编号
//obj 要显示数据的dropdown
function SetRegions(type,pid,obj)
{
var text="<option value='00000000-0000-0000-0000-000000000001'>请选择</option>";
var tempArray=new Array();
if(type==0){
tempArray=cities[pid];
} else if (type==1){
tempArray=schools[pid];;
}
if(tempArray!=null)
{
for(var i=0;i<tempArray.length;i++){
text+="<option value='"+tempArray[i][0]+"'>"+tempArray[i][1]+"</option>";
}
}
$(obj).html(text);
}

//用城市编号设置学校子数据
function CityChanged(){
SetRegions (1,$("#cities").val(),"#schools");
}

//初始化 城市 学校值
//cityId 城市编号
//schoolId 学校编号
function InitRegions(cityId,schoolId)
{
//初始化城市数据
//SetRegions(0,"00000000-0000-0000-0000-000000000000","#cities");
//查找城市并设为默认值
$("#cities option[value="+cityId+"]").attr("selected","selected");
if(schoolId!="00000000-0000-0000-0000-000000000001"){
//初始化学校数据
SetRegions(1,cityId,"#schools");
//查找学校并设为默认值
$("#schools option[value="+schoolId+"]").attr("selected","selected");
}
}

<%--城市--%>
<select runat="server" id="cities" onchange="CityChanged();">
</select>
<%--学校--%>
<select runat="server" id="schools" >
</select>
<script type="text/javascript">
SetRegions(0,'00000000-0000-0000-0000-000000000000',"#cities");//设置城市第一级
var cityId='<asp:Literal ID="Literal_cityId" runat="server"></asp:Literal>';//初始化的城市编号
var schoolId= '<asp:Literal ID="Literal_schoolId" runat="server"></asp:Literal>';//初始化的学校编号
InitRegions(cityId,schoolId);//初始化
</script>

//----后台初始化
Literal_cityId.Text = "";//初始化城市id
Literal_schoolId.Text = "";//初始化学校id

//----后台获取选择项值
string cityId = Request.Form["cities"] == null ? “00000000-0000-0000-0000-000000000001”: Request.Form["cities"];
string schoolId = Request.Form["schools"] == null ? “00000000-0000-0000-0000-000000000001”: Request.Form["schools"];

/// <summary>
/// 生成区域js文件
/// </summary>
private void CreateRegions()
{
#region 获取区域文件信息
string _cities = "var cities=new Array();<br/>";
string _schools = "var schools=new Array();<br/>";
DAL.RegionInfo dalRegion = new DAL.RegionInfo();
#region 城市信息
DataTable dtcity = dalRegion.GetList("parent_id='" + “00000000-0000-0000-0000-000000000000”+ "'").Tables[0];
_cities += "cities['" + ParentId + "']=[";
foreach (DataRow c in dtcity.Rows)
{
_cities += "['" + c["id"].ToString() + "','" + c["name"].ToString() + "'],";
#region 学校信息
DataTable dtschool = dalRegion.GetList(" parent_id='" + c["id"] + "'").Tables[0];
if (dtschool == null || dtschool.Rows.Count == 0)
{
continue;
}
_schools += "schools['" + c["id"].ToString() + "']=[";
foreach (DataRow s in dtschool.Rows)
{
_schools += "['" + s["id"].ToString() + "','" + s["name"].ToString() + "'],";
}
_schools = _schools.TrimEnd(',') + "];<br/>";
#endregion
}
_cities = _cities.TrimEnd(',') + "];<br/>";
#endregion
Response.Write(_cities + "<br/><br/>");
Response.Write(_schools + "<br/><br/>");
#endregion
}