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
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
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]
