• jquery ajax数据操作 DropDownList级联

    1、定义一个类 CityCounty.cs文件，如下：

    [csharp] view plaincopyprint?
    1. using System; 
    2. using System.Collections.Generic; 
    3. using System.Linq; 
    4. using System.Web; 
    5. using System.Runtime.Serialization; 
    6.  
    7. /// <summary> 
    8. ///CityCounty 的摘要说明 
    9. /// </summary> 
    10. [DataContract] 
    11. publicclass CityCounty 
    12. { 
    13.     [DataMember] 
    14.     privateint menu_ID; 
    15.     publicint Menu_ID 
    16.     { 
    17.         get { return menu_ID; } 
    18.         set { menu_ID = value; } 
    19.     } 
    20.  
    21.     [DataMember] 
    22.     privatestring menu_Name; 
    23.     publicstring Menu_Name 
    24.     { 
    25.         get { return menu_Name; } 
    26.         set { menu_Name = value; } 
    27.     } 
    28. }  
    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization;

/// <summary>
///CityCounty 的摘要说明
/// </summary>
[DataContract]
public class CityCounty
{
    [DataMember]
    private int menu_ID;
    public int Menu_ID
    {
        get { return menu_ID; }
        set { menu_ID = value; }
    }

    [DataMember]
    private string menu_Name;
    public string Menu_Name
    {
        get { return menu_Name; }
        set { menu_Name = value; }
    }
}

    2、定义一个Json处理类，ToJson.cs文件，如下：

    [csharp] view plaincopyprint?
    1. using System; 
    2. using System.Collections.Generic; 
    3. using System.Linq; 
    4. using System.Web; 
    5. using System.Runtime.Serialization.Json; 
    6. using System.IO; 
    7.  
    8. /// <summary> 
    9. ///JsonHelper 的摘要说明 
    10. /// </summary> 
    11. publicstaticclass JsonHelper 
    12. { 
    13.     //转换为Json格式输出 
    14.     publicstaticstring ToJson(thisobject obj) 
    15.     { 
    16.         DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType()); 
    17.         Stream stream = new MemoryStream(); 
    18.         serializer.WriteObject(stream, obj); 
    19.         stream.Position = 0; 
    20.         StreamReader streamReader = new StreamReader(stream); 
    21.         return streamReader.ReadToEnd(); 
    22.     } 
    23. }  
    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Runtime.Serialization.Json;
using System.IO;

/// <summary>
///JsonHelper 的摘要说明
/// </summary>
public static class JsonHelper
{
    //转换为Json格式输出
    public static string ToJson(this object obj)
    {
        DataContractJsonSerializer serializer = new DataContractJsonSerializer(obj.GetType());
        Stream stream = new MemoryStream();
        serializer.WriteObject(stream, obj);
        stream.Position = 0;
        StreamReader streamReader = new StreamReader(stream);
        return streamReader.ReadToEnd();
    }
}

    3、定义Default4.aspx及Default4.aspx.cs文件，如下：

    [csharp] view plaincopyprint?
    1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %> 
    2.  
    3. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
    4. <html xmlns="http://www.w3.org/1999/xhtml"> 
    5. <head runat="server"> 
    6.     <title></title> 
    7.     <script src="jquery.js" type="text/javascript"></script> 
    8.     <script type="text/javascript" language="javascript"> 
    9.         $(function () { 
    10.             $("#DropDownList1").change(function () { 
    11.                 $.ajax({ 
    12.                     url: "Default5.aspx?id=" + $(this).val(), 
    13.                     data: null, 
    14.                     dataType: "json", 
    15.                     success: function (data) { 
    16.                         $("#DropDownList2").empty(); 
    17.                         //第一种方法 
    18.                         //for (var i = 0; i < data.length; i++) { 
    19.                         //$("<option value='" + data[i]["menu_ID"] + "'>" + data[i]["menu_Name"] + "</option>").appendTo("#DropDownList2"); 
    20.                         //} 
    21.                         //第二种方法  用下面的方法也能够循环输出 .each方法 
    22.                         $.each(data, function (i) { 
    23.                             $("<option value='" + data[i]["menu_ID"] + "'>" + data[i]["menu_Name"] + "</option>").appendTo("#DropDownList2"); 
    24.                         }) 
    25.                     } 
    26.                 }); 
    27.             }); 
    28.         }); 
    29.     </script> 
    30. </head> 
    31. <body> 
    32.     <form id="form1" runat="server"> 
    33.     <div> 
    34.         <div> 
    35.             <asp:Label ID="lblone" runat="server" Text="市" /> 
    36.             <asp:DropDownList ID="DropDownList1" runat="server"> 
    37.             </asp:DropDownList> 
    38.             <asp:Label ID="lbltwo" runat="server" Text="县" /> 
    39.             <asp:DropDownList ID="DropDownList2" runat="server"> 
    40.                 <asp:ListItem Text="--请选择市--" Value="1"></asp:ListItem> 
    41.             </asp:DropDownList> 
    42.         </div> 
    43.     </div> 
    44.     </form> 
    45. </body> 
    46. </html>  
    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default4.aspx.cs" Inherits="Default4" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
    <script src="jquery.js" type="text/javascript"></script>
    <script type="text/javascript" language="javascript">
        $(function () {
            $("#DropDownList1").change(function () {
                $.ajax({
                    url: "Default5.aspx?id=" + $(this).val(),
                    data: null,
                    dataType: "json",
                    success: function (data) {
                        $("#DropDownList2").empty();
                        //第一种方法
                        //for (var i = 0; i < data.length; i++) {
                        //$("<option value='" + data[i]["menu_ID"] + "'>" + data[i]["menu_Name"] + "</option>").appendTo("#DropDownList2");
                        //}
                        //第二种方法  用下面的方法也能够循环输出 .each方法
                        $.each(data, function (i) {
                            $("<option value='" + data[i]["menu_ID"] + "'>" + data[i]["menu_Name"] + "</option>").appendTo("#DropDownList2");
                        })
                    }
                });
            });
        });
    </script>
</head>
<body>
    <form id="form1" runat="server">
    <div>
        <div>
            <asp:Label ID="lblone" runat="server" Text="市" />
            <asp:DropDownList ID="DropDownList1" runat="server">
            </asp:DropDownList>
            <asp:Label ID="lbltwo" runat="server" Text="县" />
            <asp:DropDownList ID="DropDownList2" runat="server">
                <asp:ListItem Text="--请选择市--" Value="1"></asp:ListItem>
            </asp:DropDownList>
        </div>
    </div>
    </form>
</body>
</html>
    [csharp] view plaincopyprint?
    1. using System; 
    2. using System.Collections.Generic; 
    3. using System.Linq; 
    4. using System.Web; 
    5. using System.Web.UI; 
    6. using System.Web.UI.WebControls; 
    7. using USTC; 
    8. using System.Data; 
    9.  
    10. public partial class Default4 : System.Web.UI.Page 
    11. { 
    12.     DM dm = new DM(); 
    13.     protectedvoid Page_Load(object sender, EventArgs e) 
    14.     { 
    15.         if (!IsPostBack) 
    16.         { 
    17.             string strSQL = "select * from UDS_Menu where Menu_ID like '%____00%'"; 
    18.             DataSet ds = dm.getsql(strSQL); 
    19.             this.DropDownList1.DataSource = ds; 
    20.             this.DropDownList1.DataTextField = "Menu_Name"; 
    21.             this.DropDownList1.DataValueField = "Menu_ID"; 
    22.             this.DropDownList1.DataBind(); 
    23.             this.DropDownList1.Items.Insert(0,"--请选择城市--"); 
    24.         } 
    25.     } 
    26. }  
    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using USTC;
using System.Data;

public partial class Default4 : System.Web.UI.Page
{
    DM dm = new DM();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            string strSQL = "select * from UDS_Menu where Menu_ID like '%____00%'";
            DataSet ds = dm.getsql(strSQL);
            this.DropDownList1.DataSource = ds;
            this.DropDownList1.DataTextField = "Menu_Name";
            this.DropDownList1.DataValueField = "Menu_ID";
            this.DropDownList1.DataBind();
            this.DropDownList1.Items.Insert(0,"--请选择城市--");
        }
    }
}

    4、定义Default5.aspx及Default5.aspx.cs文件，如下：

    [csharp] view plaincopyprint?
    1. <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default5.aspx.cs" Inherits="TEST_Default5" %> 
    2.  
    3. <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN""http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> 
    4.  
    5. <html xmlns="http://www.w3.org/1999/xhtml"> 
    6. <head runat="server"> 
    7.     <title></title> 
    8. </head> 
    9. <body> 
    10.     <form id="form1" runat="server"> 
    11.     <div> 
    12.      
    13.     </div> 
    14.     </form> 
    15. </body> 
    16. </html>  
    <%@ Page Language="C#" AutoEventWireup="true" CodeFile="Default5.aspx.cs" Inherits="TEST_Default5" %>

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">

<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
    <title></title>
</head>
<body>
    <form id="form1" runat="server">
    <div>
    
    </div>
    </form>
</body>
</html>
    [csharp] view plaincopyprint?
    1. using System; 
    2. using System.Collections.Generic; 
    3. using System.Linq; 
    4. using System.Web; 
    5. using System.Web.UI; 
    6. using System.Web.UI.WebControls; 
    7. using USTC; 
    8. using System.Data; 
    9.  
    10. public partial class TEST_Default5 : System.Web.UI.Page 
    11. { 
    12.     DM dm = new DM(); 
    13.     protectedvoid Page_Load(object sender, EventArgs e) 
    14.     { 
    15.         if (!IsPostBack) 
    16.         { 
    17.             IList<CityCounty> list = new List<CityCounty>(); 
    18.             string id = Request.QueryString["id"].ToString(); 
    19.             string strSQL = "select Menu_ID,Menu_Name from UDS_Menu where Super_Menu_ID=" + int.Parse(id); 
    20.             DataSet ds = dm.getsql(strSQL); 
    21.             for (int i = 0; i < ds.Tables[0].Rows.Count; i++) 
    22.             { 
    23.                 CityCounty c = new CityCounty(); 
    24.                 c.Menu_ID = Convert.ToInt32(ds.Tables[0].Rows[i]["Menu_ID"].ToString()); 
    25.                 c.Menu_Name = ds.Tables[0].Rows[i]["Menu_Name"].ToString(); 
    26.                 list.Add(c); 
    27.             } 
    28.             Response.Write(list.ToJson()); 
    29.             Response.End(); 
    30.         } 
    31.     } 
    32. }  
    using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
using USTC;
using System.Data;

public partial class TEST_Default5 : System.Web.UI.Page
{
    DM dm = new DM();
    protected void Page_Load(object sender, EventArgs e)
    {
        if (!IsPostBack)
        {
            IList<CityCounty> list = new List<CityCounty>();
            string id = Request.QueryString["id"].ToString();
            string strSQL = "select Menu_ID,Menu_Name from UDS_Menu where Super_Menu_ID=" + int.Parse(id);
            DataSet ds = dm.getsql(strSQL);
            for (int i = 0; i < ds.Tables[0].Rows.Count; i++)
            {
                CityCounty c = new CityCounty();
                c.Menu_ID = Convert.ToInt32(ds.Tables[0].Rows[i]["Menu_ID"].ToString());
                c.Menu_Name = ds.Tables[0].Rows[i]["Menu_Name"].ToString();
                list.Add(c);
            }
            Response.Write(list.ToJson());
            Response.End();
        }
    }
}
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  • 原文地址：https://www.cnblogs.com/markli/p/2824907.html
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