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Asp.net 2.0 一个简单的联动DropDownList示例(示例代码下载)

2007-02-10 22:44 1301 查看
[align=left](一). 示例图片[/align]
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[align=left](二). 详细代码[/align]
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[align=left] 1. 页面前台代码[/align]

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<body>
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<form id="form1" runat="server">
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<div>
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  <asp:Panel ID="Panel2" runat="server" BackColor="#FFC080" Font-Size="X-Large"
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ForeColor="#C04000" Height="50px" Width="387px">
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DropDownList 联动示例：</asp:Panel>
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<asp:Panel ID="Panel1" runat="server" BackColor="#C0C0FF" Height="170px" Width="387px">
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<br />
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请选择类别:<br />
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<br />
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<asp:DropDownList ID="ddl1" runat="server">
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</asp:DropDownList> 
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<asp:DropDownList ID="ddl2" runat="server">
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</asp:DropDownList> 
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<asp:DropDownList ID="ddl3" runat="server">
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</asp:DropDownList>  <br />
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<br />
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<C1:RelatedList id="rl1" runat="server"></C1:RelatedList>
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<asp:Button ID="btOK" runat="server" OnClick="Button1_Click" Text="取值" Width="67px" />
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</asp:Panel>
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</div>
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</form>
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</body>
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2.页面后台代码

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protected void Page_Load(object sender, EventArgs e)
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{
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if (!Page.IsPostBack)
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{
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ArrayList Category = new ArrayList();
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Category.Add("ddl1");
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Category.Add("ddl2");
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Category.Add("ddl3");
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//Method 1. 指定XML文件路径
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rl1.DataSource = @"Category.xml";
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/**/////Method 2. 指定数据源为DataSet对象
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//DataSet ds = new DataSet();
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//ds = GetData();
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//rl1.DataSource = ds;
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rl1.ListID = Category;
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rl1.DataBind();
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}
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}
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private DataSet GetData()
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{
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DataSet ds = new DataSet();
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DataTable dt = new DataTable();
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dt.Columns.Add(new DataColumn("Value", typeof(int)));
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dt.Columns.Add(new DataColumn("Context", typeof(string)));
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dt.Columns.Add(new DataColumn("ParentValue", typeof(int)));
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DataRow drNew = dt.NewRow();
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drNew["Value"] = 1;
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drNew["Context"] = "水果";
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drNew["ParentValue"] = 0;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 2;
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drNew["Context"] = "动物";
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drNew["ParentValue"] = 0;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 3;
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drNew["Context"] = "葡萄";
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drNew["ParentValue"] = 1;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 7;
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drNew["Context"] = "红葡萄";
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drNew["ParentValue"] = 3;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 8;
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drNew["Context"] = "柴葡萄";
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drNew["ParentValue"] = 3;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 4;
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drNew["Context"] = "桔子";
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drNew["ParentValue"] = 1;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 12;
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drNew["Context"] = "红桔子";
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drNew["ParentValue"] = 4;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 13;
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drNew["Context"] = "绿桔子";
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drNew["ParentValue"] = 4;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 5;
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drNew["Context"] = "香蕉";
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drNew["ParentValue"] = 1;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 14;
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drNew["Context"] = "马";
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drNew["ParentValue"] = 2;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 15;
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drNew["Context"] = "红马";
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drNew["ParentValue"] = 14;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 16;
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drNew["Context"] = "白马";
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drNew["ParentValue"] = 14;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 17;
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drNew["Context"] = "蓝马";
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drNew["ParentValue"] = 14;
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dt.Rows.Add(drNew);
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drNew = dt.NewRow();
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drNew["Value"] = 18;
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drNew["Context"] = "牛";
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drNew["ParentValue"] = 2;
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dt.Rows.Add(drNew);
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ds.Tables.Add(dt);
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return ds;
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}
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protected void Button1_Click(object sender, EventArgs e)
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{
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Response.Write("<script>alert('" + this.ddl1.SelectedItem.Text + "," + this.ddl2.SelectedItem.Text + "," +
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this.ddl3.SelectedItem.Text + "');</script>");
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}
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(三).示例代码下载

http://www.cnblogs.com/Files/ChengKing/LinkageDropDownList.rar
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