ajax实现动态从数据库模糊查询显示到下拉框中(ajax方法返回Dataset的例子）

功能：在textbox中输入内容，动态从数据库模糊查询显示到下拉框中，以供选择

1.建立一aspx页面，html代码

<HTML>
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<HEAD>
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<title>WebForm1</title>
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<SCRIPT language="javascript">
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//城市------------------------------
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function cityResult()
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{
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var city=document.getElementById("TextBox1");
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WebForm1.GetCityList(city.value,get_city_Result_CallBack);
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}
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function get_city_Result_CallBack(response)
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{
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if (response.value != null)
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{
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//debugger;
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document.getElementById("DropDownList1").style.display="block";
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document.getElementById("DropDownList1").length=0;　　　　
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　　　　 var ds = response.value;
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if(ds != null && typeof(ds) == "object" && ds.Tables != null)
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{
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for(var i=0; i<ds.Tables[0].Rows.length; i++)
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　　　　 {
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　　　　 var name=ds.Tables[0].Rows[i].city;
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　　　　　　 var id=ds.Tables[0].Rows[i].cityID;
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　　　　　　 document.getElementById("DropDownList1").options.add(new Option(name,id));
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　　　　 }
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}
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}
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else
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{
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document.getElementById("DropDownList1").style.display="none";
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}
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return
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}
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function getData()
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{
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var province=document.getElementById("DropDownList1");
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var pindex = province.selectedIndex;
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var pValue = province.options[pindex].value;
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var pText = province.options[pindex].text;
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document.getElementById("<%=TextBox1.ClientID%>").innerText=pText;
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}
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</SCRIPT>
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</HEAD>
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<body>
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<form id="Form1" method="post" runat="server">
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<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
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<br>
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<asp:DropDownList ID="DropDownList1" runat="server" Width="192px" style="display:none"></asp:DropDownList>
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</form>
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</body>
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</HTML>

2.cs代码

using System;
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using System.Collections;
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using System.ComponentModel;
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using System.Data;
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using System.Drawing;
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using System.Web;
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using System.Web.SessionState;
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using System.Web.UI;
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using System.Web.UI.WebControls;
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using System.Web.UI.HtmlControls;
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using System.Data.SqlClient;
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namespace ajaxselect
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{
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/**//// <summary>
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/// Summary description for WebForm1.
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/// </summary>
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public class WebForm1 : System.Web.UI.Page
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{
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protected System.Web.UI.WebControls.TextBox TextBox1;
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protected System.Web.UI.WebControls.DropDownList DropDownList1;
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private void Page_Load(object sender, System.EventArgs e)
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{
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Ajax.Utility.RegisterTypeForAjax(typeof(WebForm1));
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if (!Page.IsPostBack)
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{
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this.TextBox1.Attributes.Add("onchange", "cityResult();");
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this.DropDownList1.Attributes.Add("onclick", "getData();");
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}
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}
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Web Form Designer generated codeWeb Form Designer generated code
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GetCityList#region GetCityList
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[Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
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public DataSet GetCityList(int provinceid)
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{
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string sql = "select * from city where father like '%" + provinceid + "%'";
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return GetDataSet(sql);
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}
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#endregion
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GetDataSet#region GetDataSet
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public static DataSet GetDataSet(string sql)
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{
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string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
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SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);
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DataSet ds = new DataSet();
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sda.Fill(ds);
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return ds;
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}
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#endregion
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}
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}

3.源代码下载
4.数据库脚本

CREATE TABLE [dbo].[city](

[id] [int] NOT NULL,

[cityID] [nvarchar](6) COLLATE Chinese_PRC_CI_AS NULL,

[city] [nvarchar](50) COLLATE Chinese_PRC_CI_AS NULL,

[father] [nvarchar](6) COLLATE Chinese_PRC_CI_AS NULL,

CONSTRAINT [PK_city] PRIMARY KEY CLUSTERED

(

[id] ASC

)WITH (IGNORE_DUP_KEY = OFF) ON [PRIMARY]

) ON [PRIMARY]