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利用AjaxControlToolkit實現百度搜索時的下拉列表提示詳細步驟
編輯:AJAX基礎知識     
AjaxControlToolkit是一組控件的集合,可以實現自動補充文本框,點擊文本框彈出日歷,加水印等Ajax效果,包含40多個控件,具體實現效果如:http://www.asp.net/ajaxLibrary/AjaxControlToolkitSampleSite/Default.aspx
像百度搜索一樣,根據用戶輸入自動聯想相關詞匯,借助AjaxControlToolkit中的AutoCompleteExtender控件很簡單的實現,實現效果如下:
詳細步驟:
一:Vs中安裝AjaxControlToolkit
AjaxControlToolkit安裝到VS中(需要注意版本問題):
安裝方法:http://www.asp.net/ajaxlibrary/act.ashx
相應版本提示:http://ajaxcontroltoolkit.codeplex.com/
二:Web頁面中調用AutoCompleteExtender(頁面中要提前Register,第二行代碼)
復制代碼 代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="WebForm1.aspx.cs" Inherits="HTML_editor.WebForm1" %>
<%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="Server" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
TargetControlID="TextBox1"
CompletionSetCount="10"
EnableCaching="true"
MinimumPrefixLength="1"
CompletionInterval="100"
ServicePath="WebService.asmx"
ServiceMethod="GetEnglishName">
</asp:AutoCompleteExtender>
</div>
</form>
</body>
</html>

三:添加Web服務 WebService.asmx
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Data.SqlClient;
using System.Linq;
using System.Web;
using System.Web.Script.Services;
using System.Web.Services;
namespace HTML_editor
{
/// <summary>
/// WebService 的摘要說明
/// </summary>
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
[System.ComponentModel.ToolboxItem(false)]
// 若要允許使用 ASP.NET AJAX 從腳本中調用此 Web 服務,請取消注釋以下行。
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService
{
//從數據庫中讀取匹配信息
[WebMethod]
[ScriptMethod]
public string[] GetEnglishName(string prefixText, int count)
{
List<string> suggestions = new List<string>();//聲明一泛型集合
SqlConnection con = new SqlConnection("server=.;database=Attendance;uid=sa;pwd=;");
con.Open();
SqlCommand com = new SqlCommand(" select [EnglishName] from [Employee] where [EnglishName] like '%t%' order by [EnglishName]", con);
SqlDataReader sdr = com.ExecuteReader();
while (sdr.Read())
{
suggestions.Add(sdr.GetString(0));
}
sdr.Close();
con.Close();
return suggestions.ToArray();
}
//直接用方法產生匹配信息
//[WebMethod]
//public string[] GetCompleteList(string prefixText, int count)
//{
// char c1, c2, c3;
// if (count == 0)
// count = 10;
// List<String> list = new List<string>(count);
// Random rnd = new Random();
// for (int i = 1; i <= count; i++)
// {
// c1 = (char)rnd.Next(65, 90);
// c2 = (char)rnd.Next(97, 122);
// c3 = (char)rnd.Next(97, 122);
// list.Add(prefixText + c1 + c2 + c3);
// }
// return list.ToArray();
//}
}
}

四:完成,運行Web頁面即可看到文本框的自動補充效果,需要注意的地方如下
AutoCompleteExtender控件參數說明:
1.TargetControlID:指定要實現提示功能的控件;
2.ServicePath:WebService的路徑,提取數據的方法是寫在一個WebService中的;
3.ServeiceMethod:寫在WebService中的用於提取數據的方法的名字;
4.MinimumPrefixLength:用來設置用戶輸入多少字母才出現提示效果;
5.CompletionSetCount:設置提示數據的行數;
6.CompletionInterval:從服務器獲取書的時間間隔,單位是毫秒。
WebService.asmx 需要注意的地方:
  1.由於該WEB服務是為Ajax框架提供服務的,因此在類聲明之前得加上屬性聲明:
     [System.Web.Script.Services.ScriptService]
  2.特別需要注意的是GetTextString這個方法。凡是為AutoCompleteExtender控件提供服務的方法都必需完全滿足以下三個條件:
     A.方法的返回類型必需為:string [];
     B.方法的傳入參數類型必需為:string , int;
     C.兩個傳入參數名必需為:prefixText , count。
文本框輸入的值傳遞到WebService中:
aspx:
復制代碼 代碼如下:
<%@ Page Language="C#" AutoEventWireup="true" CodeFile="TestSearch.aspx.cs" Inherits="TestSearch" %>
<%@ Register TagPrefix="asp" Namespace="AjaxControlToolkit" Assembly="AjaxControlToolkit" %>
<!DOCTYPE html>
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title></title>
<script type="text/javascript">
function OnTxtPersonInfoKeyDown() {
var val = document.getElementById("<%=TextBox1.ClientID %>").value;
var NameClientID = "<%=AutoCompleteExtender1.ClientID %>";
var acName = $find(NameClientID);
if (acName != null) {
acName.set_contextKey(val);
}
}
function OnTxtPersonInfoKeyDown2() {
var val = document.getElementById("<%=TextBox2.ClientID %>").value;
var NameClientID = "<%=AutoCompleteExtender2.ClientID %>";
var acName = $find(NameClientID);
if (acName != null) {
acName.set_contextKey(val);
}
}
</script>
</head>
<body>
<form id="form1" runat="server">
<div>
<asp:ToolkitScriptManager ID="ToolkitScriptManager1" runat="Server" />
<asp:TextBox ID="TextBox1" runat="server"></asp:TextBox>
<asp:AutoCompleteExtender ID="AutoCompleteExtender1" runat="server"
TargetControlID="TextBox1"
CompletionSetCount="10"
EnableCaching="false"
FirstRowSelected="true"
UseContextKey="True"
MinimumPrefixLength="0"
CompletionInterval="100"
ServicePath="WebService.asmx"
ServiceMethod="GetEnglishName">
</asp:AutoCompleteExtender>
<br />
<asp:TextBox ID="TextBox2" runat="server"></asp:TextBox>
<asp:AutoCompleteExtender ID="AutoCompleteExtender2" runat="server"
TargetControlID="TextBox2"
CompletionSetCount="10"
EnableCaching="false"
FirstRowSelected="true"
UseContextKey="True"
MinimumPrefixLength="0"
CompletionInterval="100"
ServicePath="WebService.asmx"
ServiceMethod="GetEnglishName">
</asp:AutoCompleteExtender>
</div>
</form>
</body>
</html>

aspx.cs
復制代碼 代碼如下:
using System;
using System.Collections.Generic;
using System.Linq;
using System.Web;
using System.Web.UI;
using System.Web.UI.WebControls;
public partial class TestSearch : System.Web.UI.Page
{
protected void Page_Load(object sender, EventArgs e)
{
TextBox1.Attributes.Add("onkeydown", "return OnTxtPersonInfoKeyDown();");
TextBox2.Attributes.Add("onkeydown", "return OnTxtPersonInfoKeyDown2();");
}
}

webservice.asmx.cs
復制代碼 代碼如下:
<%@ WebService Language="C#" Class="WebService" %>
using System;
using System.Web;
using System.Web.Services;
using System.Web.Services.Protocols;
using System.Web.Script.Services;
using System.Data;
using System.Data.SqlClient;
using System.Collections.Generic;
[WebService(Namespace = "http://tempuri.org/")]
[WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)]
// 若要允許使用 ASP.NET AJAX 從腳本中調用此 Web 服務,請取消注釋以下行。
[System.Web.Script.Services.ScriptService]
public class WebService : System.Web.Services.WebService
{
//從數據庫中讀取匹配信息
[WebMethod]
[ScriptMethod]
public string[] GetEnglishName(string prefixText, int count, string contextKey)
{
SQLHelper sqlH = new SQLHelper();
//contextKey = "t";
string strSql = " select [EnglishName] from [Employee] where [LeftDate] is null and [EnglishName] like '" + contextKey + "%' order by [EnglishName] ";
DataTable dt = sqlH.ExecuteQuery(strSql, CommandType.Text);
List<string> suggestions = new List<string>();//聲明一泛型集合
suggestions.Clear();
if (dt.Rows.Count > 0)
{
for (int i = 0; i < dt.Rows.Count; i++)
{
suggestions.Add(dt.Rows[i][0].ToString());
}
}
return suggestions.ToArray();
}
}
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