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

 

说明:  偶发现个比较好的联动组件, 控件从网上找的, 比较好用，如下: 

(一). 示例图片

(二). 详细代码

    1. 页面前台代码

 

 1 < body >
 2      < form id = " form1 "  runat = " server " >
 3      < div >
 4          & nbsp; & nbsp; < asp:Panel ID = " Panel2 "  runat = " server "  BackColor = " #FFC080 "  Font - Size = " X-Large "
 5             ForeColor = " #C04000 "  Height = " 50px "  Width = " 387px " >
 6             DropDownList 联动示例： </ asp:Panel >
 7          < asp:Panel ID = " Panel1 "  runat = " server "  BackColor = " #C0C0FF "  Height = " 170px "  Width = " 387px " >
 8              < br  />
 9             请选择类别: < br  />
10              < br  />
11              & nbsp;
12              < asp:DropDownList ID = " ddl1 "  runat = " server " >
13              </ asp:DropDownList >& nbsp;
14              < asp:DropDownList ID = " ddl2 "  runat = " server " >
15              </ asp:DropDownList >& nbsp;
16              < asp:DropDownList ID = " ddl3 "  runat = " server " >
17              </ asp:DropDownList >& nbsp; & nbsp; < br  />
18              < br  />
19              & nbsp;
20              < C1:RelatedList id = " rl1 "  runat = " server " ></ C1:RelatedList >     
21              < asp:Button ID = " btOK "  runat = " server "  OnClick = " Button1_Click "  Text = " 取值 "  Width = " 67px "   />
22          </ asp:Panel >
23          </ div >
24      </ form >
25 </ body >
26

    2.页面后台代码

  1 protected   void  Page_Load( object  sender, EventArgs e)
  2      {
  3        if (!Page.IsPostBack)
  4        {            
  5            ArrayList Category = new ArrayList();
  6            Category.Add("ddl1");
  7            Category.Add("ddl2");
  8            Category.Add("ddl3");
  9
 10            //Method 1. 指定XML文件路径
 11            rl1.DataSource = @"Category.xml";            
 12
 13            /**/////Method 2. 指定数据源为DataSet对象
 14            //DataSet ds = new DataSet();            
 15            //ds = GetData();            
 16            //rl1.DataSource = ds;
 17
 18
 19            rl1.ListID = Category;
 20            rl1.DataBind();
 21
 22        }
 23    }
 24      private  DataSet GetData()
 25      {
 26        DataSet ds = new DataSet();
 27        DataTable dt = new DataTable();
 28        dt.Columns.Add(new DataColumn("Value", typeof(int)));
 29        dt.Columns.Add(new DataColumn("Context", typeof(string)));
 30        dt.Columns.Add(new DataColumn("ParentValue", typeof(int)));
 31        DataRow drNew = dt.NewRow();
 32        drNew["Value"] = 1;
 33        drNew["Context"] = "水果";
 34        drNew["ParentValue"] = 0;
 35        dt.Rows.Add(drNew);
 36
 37        drNew = dt.NewRow();
 38        drNew["Value"] = 2;
 39        drNew["Context"] = "动物";
 40        drNew["ParentValue"] = 0;
 41        dt.Rows.Add(drNew);
 42
 43        drNew = dt.NewRow();
 44        drNew["Value"] = 3;
 45        drNew["Context"] = "葡萄";
 46        drNew["ParentValue"] = 1;
 47        dt.Rows.Add(drNew);
 48
 49        drNew = dt.NewRow();
 50        drNew["Value"] = 7;
 51        drNew["Context"] = "红葡萄";
 52        drNew["ParentValue"] = 3;
 53        dt.Rows.Add(drNew);
 54
 55        drNew = dt.NewRow();
 56        drNew["Value"] = 8;
 57        drNew["Context"] = "柴葡萄";
 58        drNew["ParentValue"] = 3;
 59        dt.Rows.Add(drNew);
 60
 61        drNew = dt.NewRow();
 62        drNew["Value"] = 4;
 63        drNew["Context"] = "桔子";
 64        drNew["ParentValue"] = 1;
 65        dt.Rows.Add(drNew);
 66
 67        drNew = dt.NewRow();
 68        drNew["Value"] = 12;
 69        drNew["Context"] = "红桔子";
 70        drNew["ParentValue"] = 4;
 71        dt.Rows.Add(drNew);
 72
 73        drNew = dt.NewRow();
 74        drNew["Value"] = 13;
 75        drNew["Context"] = "绿桔子";
 76        drNew["ParentValue"] = 4;
 77        dt.Rows.Add(drNew);
 78
 79        drNew = dt.NewRow();
 80        drNew["Value"] = 5;
 81        drNew["Context"] = "香蕉";
 82        drNew["ParentValue"] = 1;
 83        dt.Rows.Add(drNew);
 84
 85        drNew = dt.NewRow();
 86        drNew["Value"] = 14;
 87        drNew["Context"] = "马";
 88        drNew["ParentValue"] = 2;
 89        dt.Rows.Add(drNew);
 90
 91        drNew = dt.NewRow();
 92        drNew["Value"] = 15;
 93        drNew["Context"] = "红马";
 94        drNew["ParentValue"] = 14;
 95        dt.Rows.Add(drNew);
 96
 97        drNew = dt.NewRow();
 98        drNew["Value"] = 16;
 99        drNew["Context"] = "白马";
100        drNew["ParentValue"] = 14;
101        dt.Rows.Add(drNew);
102
103        drNew = dt.NewRow();
104        drNew["Value"] = 17;
105        drNew["Context"] = "蓝马";
106        drNew["ParentValue"] = 14;
107        dt.Rows.Add(drNew);
108
109        drNew = dt.NewRow();
110        drNew["Value"] = 18;
111        drNew["Context"] = "牛";
112        drNew["ParentValue"] = 2;
113        dt.Rows.Add(drNew);      
114
115        ds.Tables.Add(dt);
116        return ds;
117    }
118      protected   void  Button1_Click( object  sender, EventArgs e)
119      {
120        Response.Write("<script>alert('" + this.ddl1.SelectedItem.Text + "," + this.ddl2.SelectedItem.Text + "," + 
121                                           this.ddl3.SelectedItem.Text + "');</script>");               
122}
123

  (三).示例代码下载

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