asp.net三级联动菜单问题
在网上找了一段ASP.NET三级联动菜单的代码，调试后总是只有第一个一级菜单可以实现三级联动，其它的都没有反应，出现不了相应的二级和三级菜单，大家帮忙看下什么原因啊，或者谁有已经运行成功的代码.if (!IsPostBack)
{
//一级分类列表
this.DropDownList1.DataSource = dsbb.SelectSubjct1();
this.DropDownList1.DataTextField = "cName";
this.DropDownList1.DataValueField = "Ccode";
this.DropDownList1.DataBind();
this.DropDownList1.Items.Insert(0,new ListItem("请选择一级分类","0"));
this.DropDownList8.Items.Insert(0, new ListItem("请选择二级分类", "0"));
this.DropDownList9.Items.Insert(0,new ListItem ("请选择三级分类","0"));
//二级分类列表
}
/// <summary>
/// 绑定二级分类
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
libs.Database.Dbbase dbb = new libs.Database.Dbbase();
if (Convert.ToInt32(this.DropDownList1.SelectedValue) == 0) //清除列表内容
{
this.DropDownList8.Items.Clear();
this.DropDownList8.Items.Insert(0, new ListItem("请选择二级分类", "0"));
this.DropDownList9.Items.Clear();
this.DropDownList9.Items.Insert(0, new ListItem("请选择三级分类", "0"));
}
else //二级分类列表
{
this.DropDownList8.DataSource = dbb.Selectsubjct2(this.DropDownList1.SelectedValue.Substring(0,2));
this.DropDownList8.DataTextField = "cName";
this.DropDownList8.DataValueField = "Ccode";
this.DropDownList8.DataBind();
this.DropDownList8.Items.Insert(0,new ListItem ("请选择二级分类","0"));
this.DropDownList9.Items.Clear();//清除第三分类
this.DropDownList9.Items.Insert(0, new ListItem("请选择三级分类", "0"));
}
}
/// <summary>
/// 绑定三级分类
/// </summary>
/// <param name="sender"></param>
/// <param name="e"></param>
protected void DropDownList8_SelectedIndexChanged(object sender, EventArgs e)
{
libs.Database.Dbbase dbase = new libs.Database.Dbbase();
this.DropDownList9.DataSource = dbase.selectsubject3(this.DropDownList8.SelectedValue.Substring(0,4));
this.DropDownList9.DataTextField = "cName";
this.DropDownList9.DataValueField = "Ccode";
this.DropDownList9.DataBind();
this.DropDownList9.Items.Insert(0,new ListItem("请选择三级分类","0"));
}
Dbbase.cs页：
/// <summary>
/// 查询一级栏目
/// </summary>
/// <returns></returns>
public DataSet SelectSubjct1()
{
string con = System.Configuration.ConfigurationSettings.AppSettings["sqlconn"];
SqlConnection conn = new SqlConnection(con);
string sqlstr = "SELECT kndid, Ccode, cName, cLevel FROM kind WHERE cLevel = 1";
DataSet dst = new DataSet();
SqlDataAdapter sda = new SqlDataAdapter(sqlstr,conn);
try
{
sda.Fill(dst);
return dst;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
conn.Close();
}
}
/// <summary>
/// 查询二级栏目内容
/// </summary>
/// <param name="ccode"></param>
/// <returns></returns>
public DataSet Selectsubjct2(string ccode)
{
string conn1 = System.Configuration.ConfigurationSettings.AppSettings["sqlconn"];
SqlConnection conn = new SqlConnection(conn1);
string sqqq = "select kndid,Ccode,cName,cLevel from kind where cLevel = 2 and Ccode like '" + ccode + "%'";
DataSet dss = new DataSet();
SqlDataAdapter sdd = new SqlDataAdapter(sqqq,conn);
try
{
sdd.Fill(dss);
return dss;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
conn.Close();
}
}
/// <summary>
/// 查询三级栏目内容
/// </summary>
/// <param name="cde"></param>
/// <returns></returns>
public DataSet selectsubject3(string cde)
{
string conn2 = System.Configuration.ConfigurationSettings.AppSettings["sqlconn"];
SqlConnection conn = new SqlConnection(conn2);
string sqq = "select kndid,Ccode,cName,cLevel from kind where cLevel = 3 and Ccode like '" + cde + "%'";
DataSet dst = new DataSet();
SqlDataAdapter sdaa = new SqlDataAdapter(sqq,conn);
try
{
sdaa.Fill(dst);
return dst;
}
catch (Exception ex)
{
throw new Exception(ex.Message);
}
finally
{
conn.Close();
}
}
--------------------编程问答-------------------- else //二级分类列表
{
this.DropDownList8.DataSource = dbb.Selectsubjct2(this.DropDownList1.SelectedValue.Substring(0,2));
调试一下，看这里什么数据，另外dropdownlist的runat="server"加没 --------------------编程问答-------------------- 调试看看数据是否存在，AutoPoatback是否为true,事件是否执行
这种方法不可取。
一般都用ajax实现无刷新三级联动
http://topic.csdn.net/u/20090709/12/9eefeb53-c4a6-4fd0-8c1b-1d3282627417.html --------------------编程问答-------------------- 看的太乱了 --------------------编程问答--------------------
不加runat="server"，后台this不到的吧。。。
还是建议楼主用ajax做，这样你也不用考虑后台ispostback的问题了，我是用easyui的combobox做的
如果一定要用后台做的话，建议传个List<T>的值回来，绑定起来也方便
XXXX.Items.Add(0,new ListItem(List<T>.XX,List<T>.XX));
补充：.NET技术 , ASP.NET
