如何实现两个DropDownList两级联动连接数据库
using System.Data;using System.Linq;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.HtmlControls;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Linq;
using System.Data.SqlClient;
public partial class DropDownList : System.Web.UI.Page
{
string cnnstr = "Data Source=IE361-PC;Initial Catalog=emplyee;Persist Security Info=True;User ID=sa;Password=123";
SqlConnection conn;
protected void Page_Load(object sender, EventArgs e)
{
if (!IsPostBack)
{
SqlConnection conn = new SqlConnection(cnnstr);
string strSQL = "select distinct xb from xbbj";
SqlDataAdapter ada = new SqlDataAdapter(strSQL, conn);
DataSet ds = new DataSet();
ada.Fill(ds, "xbbj");
DropDownList1.DataSource = ds;//.Tables["xbbj"].DefaultView;
DropDownList1.DataValueField ="xb";// ds.Tables["xbbj"].Columns[0].ColumnName;
DropDownList1.DataTextField = "xb";// ds.Tables["xbbj"].Columns[0].ColumnName;
DropDownList1.DataBind();
// ds.Dispose();
}
}
protected void DropDownList1_SelectedIndexChanged(object sender, EventArgs e)
{
Response.Write(DropDownList1.SelectedItem.Text.ToString());
//SqlConnection conn = new SqlConnection(cnnstr);
string strSQL1 = "select distinct bj from xbbj where xb='"+DropDownList1.SelectedValue+"'";
SqlDataAdapter ada1 = new SqlDataAdapter(strSQL1, conn);
DataSet ds1 = new DataSet();
ada1.Fill(ds1, "xbbj1");
DropDownList2.DataSource = ds1.Tables["xbbj1"].DefaultView;
DropDownList2.DataValueField = ds1.Tables["xbbj1"].Columns[0].ColumnName;
DropDownList2.DataTextField = ds1.Tables["xbbj1"].Columns[0].ColumnName;
DropDownList2.DataBind();
ds1.Dispose();
}
}
/*
数据库文件 表名：xbbj
xb bj
计算机系 一班
计算机系 二班
计算机系 三班
计算机系 四班
水利水电系 一班
水利水电系 二班
水利水电系 三班
水利水电系 四班
--------------------编程问答-------------------- 第一个DropDownList设置属性AutoPostBack="true" --------------------编程问答-------------------- 出现怎么个状况?设置ls说的autopostback没? --------------------编程问答--------------------
+1 --------------------编程问答-------------------- 如果是用一条语句查询出的结果，要用到defaultview的filter过滤filter=“计算机系” --------------------编程问答-------------------- 参考
http://www.cnblogs.com/zhangzs8896/articles/382632.html --------------------编程问答-------------------- jQueryJSON 无刷新三级联动
http://www.cnblogs.com/zengxiangzhan/archive/2010/02/21/1670646.html --------------------编程问答-------------------- 把第一级的DropDownList设置属性AutoPostBack="true" --------------------编程问答-------------------- +1 --------------------编程问答-------------------- 问题描述的不够清楚
真的是autopostback的问题？ --------------------编程问答-------------------- <asp:ScriptManager ID="ScriptManager1" runat="server">
</asp:ScriptManager>
<div>
<asp:UpdatePanel ID="UpdatePanel1" runat="server">
<ContentTemplate>
<asp:DropDownList ID="ddlLB" runat="server" Width="15%" AutoPostBack="True" OnSelectedIndexChanged="ddlLB_SelectedIndexChanged">
</asp:DropDownList>
<asp:DropDownList ID="ddlChild" runat="server" Width="20%">
</asp:DropDownList>
</ContentTemplate>
</asp:UpdatePanel>
</div>
protected void ddlLB_SelectedIndexChanged(object sender, EventArgs e)
{
if(this.ddlLB.SelectedValue!=null)
{
BindChild(this.ddlLB.SelectedValue);
}
}什么问题
--------------------编程问答-------------------- 顶啊 --------------------编程问答-------------------- 还是不行啊 --------------------编程问答-------------------- 现在可以了，不过不怎么好用
补充：.NET技术 , ASP.NET
