jqurey ajax 的动态添加二级联动下拉菜单

protected void Page_Load(object sender, EventArgs e)
{

if (!IsPostBack)
{
if (Request["type"] == "drop")
{
Response.Write(DorpDowenlistBind());
Response.End();
return;
}
if (Request["type"] == "drop2")
{
Response.Write(Drop2list());
Response.End();
return;
}
}
}

///<summary>
/// 下来菜单数据项绑定
///</summary>
protected string DorpDowenlistBind()
{
StringBuilder strSql = new StringBuilder();

strSql.Append("[");
DataTable dt = GClassManager.GetAllList().Tables[0];//获取数据源
foreach (DataRow dr in dt.Rows)
{
strSql.AppendFormat("[\"{0}\",\"{1}\"],", dr["GclassID"], dr["GclassName"]);
}
strSql.Append("]");
return strSql.ToString().Replace(",]", "]");
}
///<summary>
/// 下来菜单数据项绑定
///</summary>
protected string Drop2list()
{
DataTable dt = new DataTable();
if (Request.Form["id"] == null)
{
dt = AttributeManager.GetAllList().Tables[0];
}
else
{
dt=AttributeManager.GetList("ClassId=" + Request.Form["id"].ToString() + "").Tables[0];
}
StringBuilder strSql = new StringBuilder();
strSql.Append("[");
foreach (DataRow dr in dt.Rows)
{
strSql.AppendFormat("[\"{0}\",\"{1}\"],",dr["AttributeId"],dr["AttributeName"]);
}
strSql.Append("]");
return strSql.ToString().Replace(",]","]");
}