有关三级联动和页面无刷新的问题
想请教一下，我使用三个SqlDataSource控件分别为三个下拉列表框提供数据。在这种情况下，有没有可能实现下拉框的三级联动？而且是否还能实现页面无刷新？如果可以的话请给点指点，最好能具体详细点！ --------------------编程问答-------------------- SqlDataSource不用这玩意行不。？
--------------------编程问答--------------------
using System;
using System.Data;
using System.Configuration;
using System.Web;
using System.Web.Security;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
public partial class _Default : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
if (!this.IsPostBack)
{
//绑定省
SqlConnection con = new SqlConnection("server=.;database=dropDownTest;integrated security=true;");
con.Open();
SqlCommand cmd = new SqlCommand("select * from provience", con);
SqlDataReader sdr = cmd.ExecuteReader();
this.ddlprovince.DataSource = sdr;
this.ddlprovince.DataTextField = "proName";
this.ddlprovince.DataValueField = "proID";
this.ddlprovince.DataBind();
sdr.Close();
//绑定市
SqlCommand cmdcity = new SqlCommand("select * from city where proID=" + this.ddlprovince.SelectedValue, con);
SqlDataReader sdr1 = cmdcity.ExecuteReader();
this.ddlcity.DataSource = sdr1;
this.ddlcity.DataTextField = "cityName";
this.ddlcity.DataValueField = "cityID";
this.ddlcity.DataBind();
sdr1.Close();
con.Close();
}
}
protected void ddlprovince_SelectedIndexChanged(object sender, EventArgs e)
{
string proID = this.ddlprovince.SelectedValue;
SqlConnection con = new SqlConnection("server=.;database=dropDownTest;integrated security=true;");
con.Open();
SqlCommand cmd = new SqlCommand("select*from city where proID=" + proID, con);
SqlDataReader sdr= cmd.ExecuteReader();
this.ddlcity.DataSource = sdr;
this.ddlcity.DataTextField = "cityName";
this.ddlcity.DataValueField = "cityID";
this.ddlcity.DataBind();
sdr.Close();
con.Close();
}
}
ddlprovince 为省 dropdownlist ID
ddlcity 为市 dropdownlist ID
proName proID为表provience中的字段 也就是省的
cityName cityID为市city表中的字段 是市的
ddlprovince_SelectedIndexChanged为省的dropdownlist 选中事件 触发绑定
数据库 Demo 完整 --------------------编程问答-------------------- 当然可以，以下是部门和专业两个DropDownList联动，可类推n个，
(不过前面的n-1个的DropDownList的AutoPostBack要设置成true)
<asp:DropDownList ID="DropDownList1" runat="server" AutoPostBack="True"
DataSourceID="SqlDataSource1" DataTextField="部门名称" DataValueField="部门id">
</asp:DropDownList>
<asp:DropDownList ID="DropDownList2" runat="server"
DataSourceID="SqlDataSource2" DataTextField="专业名称"
DataValueField="专业id">
</asp:DropDownList>
<asp:SqlDataSource ID="SqlDataSource1" runat="server"
ConnectionString="<%$ ConnectionStrings:DBaseConnectionString %>"
SelectCommand="SELECT [部门id], [部门名称] FROM [部门表]">
</asp:SqlDataSource>
<asp:SqlDataSource ID="SqlDataSource2" runat="server"
ConnectionString="<%$ ConnectionStrings:DBaseConnectionString %>"
SelectCommand="SELECT [专业id], [专业名称] FROM [专业表] WHERE ([部门id] = @部门id)">
<SelectParameters>
<asp:ControlParameter ControlID="DropDownList1" Name="部门id"
PropertyName="SelectedValue" Type="Int32" />
</SelectParameters> </asp:SqlDataSource>
红色是关键！
至于无刷新，简单的可用微软的ajax,套一下就可以了！
用jqury的ajax烦一点！ --------------------编程问答-------------------- 貌似不能。
很久很久以前弄过一个无刷新的联动，还是手动创建的XmlHttpRequest对象，你可以看下。
参考 --------------------编程问答--------------------
+1 这个修改下 很容易做成ashx+jquery+xml的无刷新联动 --------------------编程问答--------------------
是这样的！ --------------------编程问答-------------------- <tr>
<td style="width: 2490px; height: 28px; text-align: right">
请选择实验室：</td>
<td style="width: 181px; height: 28px; text-align: left">
<asp:DropDownList ID="ddlLab" runat="server" Width="158px" AutoPostBack="True" DataSourceID="sdsLab" DataTextField="edName" DataValueField="experimentDepartID" >
</asp:DropDownList></td>
<td style="width: 213px; height: 28px; text-align: left">
</td>
</tr>
<tr>
<td colspan="3" style="height: 1px; text-align: right; background-color: black;">
</td>
</tr>
<tr>
<td style="width: 2490px; text-align: right">
请选择实验课程名称：</td>
<td style="width: 181px; text-align: left">
<asp:DropDownList ID="ddlCourse" runat="server" Width="157px" AutoPostBack="True" DataSourceID="sdsExam" DataTextField="courseName" DataValueField="examId" >
</asp:DropDownList></td>
<td style="width: 213px; text-align: left">
[若暂无名称需要先添加]</td>
</tr>
<tr>
<td colspan="3" style="height: 1px; text-align: right; background-color: black;">
</td>
</tr>
<tr>
<td style="width: 2490px; text-align: right; height: 22px;">
实验主题(或章节名称)：</td>
<td style="width: 181px; text-align: left; height: 22px;">
<asp:DropDownList ID="ddlTheme" runat="server" Width="158px" DataSourceID="sdsTheme" DataTextField="labTheme" DataValueField="labThemeId">
</asp:DropDownList></td>
<td style="width: 213px; text-align: left; height: 22px;">
[若暂无名称需要先添加]</td>
</tr>
<asp:SqlDataSource ID="sdsLab" runat="server" ConnectionString="<%$ ConnectionStrings:devicemanageConnectionString %>"
SelectCommand="SELECT experimentDepartID, edName FROM experimentDepart ORDER BY experimentDepartID"></asp:SqlDataSource>
<asp:SqlDataSource ID="sdsExam" runat="server" ConnectionString="<%$ ConnectionStrings:devicemanageConnectionString %>"
SelectCommand="SELECT courseName, examId, experimentDepartID FROM exam where experimentDepartID = @experimentDepartID">
<SelectParameters>
<asp:ControlParameter ControlID="ddlLab" Name="experimentDepartID" PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
<asp:SqlDataSource ID="sdsTheme" runat="server" ConnectionString="<%$ ConnectionStrings:devicemanageConnectionString %>"
SelectCommand="SELECT labThemeId, labTheme, examId FROM lab_Theme WHERE (examId = @examId)">
<SelectParameters>
<asp:ControlParameter ControlID="ddlCourse" Name="examId" PropertyName="SelectedValue" />
</SelectParameters>
</asp:SqlDataSource>
你们说得红色部分我都有啊，但是好像只能联动一次，之后就回不来了。
补充：.NET技术 , ASP.NET
