Ajax实现在textbox中输入内容，动态从数据库中模糊查询显示到下拉框中

Ajax实现在textbox中输入内容，动态从数据库中模糊查询显示到下拉框中
http://www.cnblogs.com/singlepine/archive/2006/05/21/405566.html

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>
    <HEAD>
        <title>WebForm1</title>
        <SCRIPT language="javascript">            
            //城市------------------------------
            function cityResult() 
            { 
                var city=document.getElementById("TextBox1");
                WebForm1.GetCityList(city.value,get_city_Result_CallBack);
            }
            
            function get_city_Result_CallBack(response)
            {
                if (response.value != null)
                {                    
                    //debugger;
                    document.getElementById("DropDownList1").style.display="block";
                    document.getElementById("DropDownList1").length=0;　　　　            
　　　　            var ds = response.value;
                    if(ds != null && typeof(ds) == "object" && ds.Tables != null)
                    {                    
                        for(var i=0; i<ds.Tables[0].Rows.length; i++)
　　　　                {
　　　　                    var name=ds.Tables[0].Rows[i].city;
　　　　　　                var id=ds.Tables[0].Rows[i].cityID;
　　　　　　                document.getElementById("DropDownList1").options.add(new Option(name,id));
　　　　                }
                    }
                }
                else
                {
                    document.getElementById("DropDownList1").style.display="none";
                }             
                return
            }
           
            function getData()
            {
                var province=document.getElementById("DropDownList1");
                var pindex = province.selectedIndex;
                var pValue = province.options[pindex].value;
                var pText  = province.options[pindex].text;                                                

                document.getElementById("<%=TextBox1.ClientID%>").innerText=pText;
            }
        </SCRIPT>
    </HEAD>
    <body>
        <form id="Form1" method="post" runat="server">
            <asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
            <br>
            <asp:DropDownList ID="DropDownList1" runat="server" Width="192px" style="display:none"></asp:DropDownList>
        </form>
    </body>
</HTML>
2.cs代码
using System;
using System.Collections;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Web;
using System.Web.SessionState;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.HtmlControls;
using System.Data.SqlClient;
namespace ajaxselect
{
    /**//// <summary>
    /// Summary description for WebForm1.
    /// </summary>
    public class WebForm1 : System.Web.UI.Page
    {
        protected System.Web.UI.WebControls.TextBox TextBox1;
        protected System.Web.UI.WebControls.DropDownList DropDownList1;
    
        private void Page_Load(object sender, System.EventArgs e)
        {
            Ajax.Utility.RegisterTypeForAjax(typeof(WebForm1));
            if (!Page.IsPostBack)
            {
                this.TextBox1.Attributes.Add("onchange", "cityResult();");
                this.DropDownList1.Attributes.Add("onclick", "getData();");
            }
        }

        Web Form Designer generated code#region Web Form Designer generated code
        override protected void OnInit(EventArgs e)
        {
            //
            // CODEGEN: This call is required by the ASP.NET Web Form Designer.
            //
            InitializeComponent();
            base.OnInit(e);
        }
        
        /**//// <summary>
        /// Required method for Designer support - do not modify
        /// the contents of this method with the code editor.
        /// </summary>
        private void InitializeComponent()
        {    
            this.Load += new System.EventHandler(this.Page_Load);

        }
        #endregion

        GetCityList#region GetCityList
        [Ajax.AjaxMethod(Ajax.HttpSessionStateRequirement.Read)]
        public DataSet GetCityList(int provinceid)
        {
            string sql = "select * from city where father like '%" + provinceid + "%'";
            return GetDataSet(sql);
        }
        #endregion
        GetDataSet#region GetDataSet
        public static DataSet GetDataSet(string sql)
        {
            string ConnectionString = System.Configuration.ConfigurationSettings.AppSettings["ConnectionString"];
            SqlDataAdapter sda = new SqlDataAdapter(sql, ConnectionString);
            DataSet ds = new DataSet();
            sda.Fill(ds);
            return ds;
        }
        #endregion

    }
}
3.源代码下载 http://singlepine.cnblogs.com/Files/singlepine/ajaxselect.rar   
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]

posted on 2007-06-20 13:25 chenguo 阅读(462) 评论(0)  编辑  收藏 所属分类: AJAX Dev


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