Ajax实现textbox输入内容,动态从数据库中模糊查询显示在下拉框-WEB开发网
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Ajax实现textbox输入内容,动态从数据库中模糊查询显示在下拉框

时间:2012-06-26 07:44:13   编辑:王连龙   文章来源: 已阅读:1817 次

<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"];
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