asp.net手写AJAX实现类似Google的搜索提示

原文：http://www.cnblogs.com/Ferry/archive/2008/12/24/1361505.html

功能就不用多说了，到http://www.google.cn/去试一下就知道了。本例是参考了《征服AJAX》一书中的范例。

实现该功能也是用到两个页面，一个请求显示（这次使用的静态页面），一个用于获取关键字到数据表中模糊查询并获取满足条件的数据输出。这里的搜索提示实际上是用div来实现的，C#代码很简单，关键是看明白JavaScript。

<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd">
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<html xmlns="http://www.w3.org/1999/xhtml">
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<head>
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<title>无标题页</title>
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<!--
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var searchReq = createReq();
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/* 创建XMLHttpRequest的第一种方法
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try{
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searchReq = new ActiveXObject('Msxml2.XMLHTTP');
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}
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catch(e){
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try{
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searchReq = new ActiveXObject('Microsoft.XMLHTTP');
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}
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catch(e){
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try{
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searchReq = new XMLHttpRequest();
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}
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catch(e)
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{}
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}
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}
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*/
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//创建XMLHttpRequest的第二种方法
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function createReq(){
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var httpReq;
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if(window.XMLHttpRequest){
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httpReq = new XMLHttpRequest();
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if(httpReq.overrideMimeType){
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httpReq.overrideMimeType('text/xml');
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}
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}
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else if(window.ActiveXObject){
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try{
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httpReq = new ActiveXObject('Msxml2.XMLHTTP');
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}
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catch(e){
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try{
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httpReq = new ActiveXObject('Microsoft.XMLHTTP');
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}
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catch(e){
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}
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}
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}
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return httpReq;
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}
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//发送HTTP请求，当输入框的内容变化时，会调用该函数
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function searchSuggest(){
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var str = escape(document.getElementById("txtSearch").value);
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searchReq.open("get","Server.aspx?searchText="+str,true);
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searchReq.onreadystatechange = handleSearchSuggest;
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searchReq.send(null);
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}
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//当 onreadystatechange 值变化时，会调用该函数
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//注意searchSuggest()中的这一句searchReq.onreadystatechange = handleSearchSuggest;
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function handleSearchSuggest(){
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if(searchReq.readyState == 4){
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if(searchReq.status == 200){
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var suggestText = document.getElementById("search_suggest");
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var sourceText = searchReq.responseText.split("\n");
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if(sourceText.length>1){
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suggestText.style.display="";
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suggestText.innerHTML = "";
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for(var i=0;i<sourceText.length-1;i++) {
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var s='<div onmouseover="javascript:suggestOver(this);"';
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s+=' onmouseout="javascript:suggestOut(this);" ';
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s+=' onclick="javascript:setSearch(this.innerHTML);" ';
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s+=' class="suggest_link">' +sourceText[i]+'</div>';
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suggestText.innerHTML += s;
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}
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}
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else{
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suggestText.style.display="none";
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}
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}
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}
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}
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function suggestOver(div_value){
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div_value.className = "suggest_link_over";
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}
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function suggestOut(div_value){
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div_value.className = "suggest_link";
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}
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function setSearch(obj){
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document.getElementById("txtSearch").value = obj;
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var div = document.getElementById("search_suggest");
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div.innerHTML = "";
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div.style.display="none";
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}
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function tbblur(){
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var div = document.getElementById("search_suggest");
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//div.innerHTML = "";
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div.style.display="none";
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}
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//-->
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</script>
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body
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{
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font: 11px arial;
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}
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.suggest_link
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{
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background-color: #FFFFFF;
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padding: 2px 6px 2px 6px;
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}
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.suggest_link_over
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{
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background-color: #E8F2FE;
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padding: 2px 6px 2px 6px;
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}
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#search_suggest
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{
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position: absolute;
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background-color: #FFFFFF;
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text-align: left;
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border: 1px solid #000000;
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}
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</style>
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</head>
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<body>
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<div style="width: 500px;">
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<form id="frm" action="">
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<input type="text" name="txtSearch" id="txtSearch" onkeyup="searchSuggest();" autocomplete="off" />
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<input type="submit" name="btnSearch" id="btnSearch" value="搜索" />
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<br><div id="search_suggest" style="display:none">
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</div>
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Welcome to ajax!
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</form>
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</div>
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</body>
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</html>
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Server.aspx:就是留第一行，把其它删除。

<%@ Page Language="C#" AutoEventWireup="true" CodeBehind="Server.aspx.cs" Inherits="ajaxPractice.搜索提示S端" %>

Server.aspx.cs

using System;
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using System.Collections;
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using System.Configuration;
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using System.Data;
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using System.Linq;
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using System.Web;
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using System.Web.Security;
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using System.Web.UI;
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using System.Web.UI.HtmlControls;
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using System.Web.UI.WebControls;
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using System.Web.UI.WebControls.WebParts;
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using System.Xml.Linq;
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using System.Data.SqlClient;
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namespace ajaxPractice
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{
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public partial class 搜索提示S端 : System.Web.UI.Page
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{
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protected void Page_Load(object sender, EventArgs e)
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{
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if (Request.QueryString["searchText"] != null)
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{
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if (Request.QueryString["searchText"].ToString().Trim().Length > 0)
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{
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#region
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DataTable dt = new DataTable();
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using (SqlConnection conn = new SqlConnection(
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System.Configuration.ConfigurationManager.AppSettings["ConnStr"]))
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{
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SqlCommand cmd = new SqlCommand();
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cmd.Connection = conn;
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cmd.CommandText = string.Format(
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"Select BookName From Books Where BookName like '%{0}%'",
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Request.QueryString["searchText"]);
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SqlDataAdapter adapter = new SqlDataAdapter(cmd);
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conn.Open();
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adapter.Fill(dt);
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}
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string returnText = "";
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if (dt != null && dt.Rows.Count > 0)
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{
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for (int i = 0; i < dt.Rows.Count; i++)
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{
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returnText += dt.Rows[i][0].ToString() + "\n";
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}
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}
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Response.Write(returnText);
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#endregion
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}
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}
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}
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}
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}

posted @ 2010-08-31 19:27 你妹的sb 阅读(1953) 评论(1) 编辑收藏举报

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asp.net手写AJAX实现类似Google的搜索提示

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