博客的前某一篇文章中/hEnius/p/-07-01.html写过一个用Ajax来实现一个文本框输入的提示功能。最近在一个管理项目的项目中，使用后发现，真的反应很慢，数据量很大的情况下使用Ajax去实现真的不合适，于是，我又写了一个使用Jquery来实现方法。
废话不多说，上图上代码:
引用方式：
<body style="background-color: White;"><form id="form1" runat="server"><div id="filter_stationType"></div><div class="gover_search" width="100%"><div class="gover_search_form clearfix" width="100%"><span class="search_t"><b>按项目名称检索：</b></span>
<%--autocomplete="off" 这个设置是禁止浏览器自动完成提示功能（就是历史记录自动提示）--%>
<asp:TextBox ID="search" runat="server" CssClass="input_search_key" Width="240px" autocomplete="off"></asp:TextBox> <asp:Button ID="btnSearchProject" runat="server" CssClass="search_btn" Text="查询" OnClick="btnSearchProject_Click" /> <div class="search_suggest" id="gov_search_suggest"> <ul> </ul> </div> </div> </div> </form> </body>
JS代码：
<script type="text/javascript"> //实现搜索输入框的输入提示js类var oSearchSuggest = function(searchFuc) {//function oSearchSuggest(searchFuc) {var searchsubmit = $('#btnSearchProject');var input = $('#search');var suggestWrap = $('#gov_search_suggest');var key = "";var init = function() {input.bind('keyup', sendKeyWord);input.bind('blur', function() { setTimeout(hideSuggest, 100); })}var hideSuggest = function() {suggestWrap.hide();}//发送请求，根据关键字到后台查询var sendKeyWord = function(event) {//键盘选择下拉项if (suggestWrap.css('display') == 'block' && event.keyCode == 38 || event.keyCode == 40) {var current = suggestWrap.find('li.hover');if (event.keyCode == 38) {if (current.length > 0) {var prevLi = current.removeClass('hover').prev();if (prevLi.length > 0) {prevLi.addClass('hover');input.val(prevLi.html());}} else {var last = suggestWrap.find('li:last');last.addClass('hover');input.val(last.html());}} else if (event.keyCode == 40) {if (current.length > 0) {var nextLi = current.removeClass('hover').next();if (nextLi.length > 0) {nextLi.addClass('hover');input.val(nextLi.html());}} else {var first = suggestWrap.find('li:first');first.addClass('hover');input.val(first.html());}}//输入字符} else {var valText = $.trim(input.val());if (valText == '' || valText == key) {return;}searchFuc(valText);key = valText;}}//请求返回后，执行数据展示this.dataDisplay = function(data) {if (data.length <= 0) {suggestWrap.hide();return;}//往搜索框下拉建议显示栏中添加条目并显示var li;var tmpFrag = document.createDocumentFragment();suggestWrap.find('ul').html('');for (var i = 0; i < data.length; i++) {li = document.createElement('LI');li.innerHTML = data[i];tmpFrag.appendChild(li);}suggestWrap.find('ul').append(tmpFrag);suggestWrap.show();//为下拉选项绑定鼠标事件,实现鼠标点击选取suggestWrap.find('li').hover(function() {suggestWrap.find('li').removeClass('hover');$(this).addClass('hover');}, function() {$(this).removeClass('hover');}).bind('mousedown', function() {input.val(this.innerHTML);suggestWrap.hide();searchsubmit.click();});}init();};//实例化输入提示的JS,参数为进行查询操作时要调用的函数名var searchSuggest = new oSearchSuggest(sendKeyWordToBack);//这是一个模似函数，实现向后台发送ajax查询请求，并返回一个查询结果数据，传递给前台的JS,再由前台JS来展示数据。本函数由程序员进行修改实现查询的请求//参数为一个字符串，是搜索输入框中当前的内容 function sendKeyWordToBack(keyword) {var sSearchKey = $("#search").val();$("#search").bind("input propertychange", function(event) {sSearchKey = $("#search").val();});$.ajax({url: "WebService/wbsBLL.asmx/GetSearchInfo", //后台webservice里的方法名称根据自己需要实现返回数据位jsontype: "POST",dataType: "json",async: false,contentType: "application/json; charset=utf-8",data: '{"sKeyName":"' + sSearchKey + '"}',traditional: false,beforeSend: function(x) { x.setRequestHeader("Content-Type", "application/json; charset=utf-8"); },success: function(data) {var aData = [];for (var i in data) {var jsonObj = $.parseJSON(data[i]);for (var item in jsonObj) {jsonObj = eval(jsonObj.SeachTable);for (var i = 0; i < jsonObj.length; i++) {if (jsonObj[i].projectName != "") {aData.push(jsonObj[i].projectName);}}}}searchSuggest.dataDisplay(aData);},error: function(msg, e) {$("#filter_stationType").html("SQL语句有错误");},complete: function(x) {}});}</script>
index.css:
@charset "utf-8";/* CSS Document */body, ul, li {margin: 0;padding: 0;}body{ font-size:12px; font-family:sumsun,arial;color:#666666;background:#FFFFFF;}#searchtable{background:#E4E9F2; border-bottom:1px solid #C8CFDA; padding:0px 8px;height: 33px;}#searchtable label{font-size:14px; display:inline-block; float:left; color:#333; text-shadow:1px 1px 0px #EBF5FA; font-weight:bold; padding:10px 0 8px 16px; background:url(../images/pemIcons.png) 2px -34px no-repeat; _background:url(../images/pemIcons.gif) 2px -34px no-repeat;}#searchtable #search{border: 1px solid #C3C3C3; border-top: 1px solid #7C7C7C; border-left: 1px solid #9A9A9A;background: url(../images/today.gif) 0 -162px white repeat-x;outline: none; padding:3px 4px; _padding:3px 4px 5px; display:inline-block; float:left; margin:6px 12px 4px 0; zoom:1;}#searchtable .btnSubmit{margin-top:6px;margin-left:5px; zoom:1; border: 1px solid #236300; background: #6B9F40 url(../images/buttonbg01.png) repeat-x 0 0; font-size:12px; color:#FFF; line-height:24px; height:24px; width:60px; font-weight:bold; display:block; text-align:center; float:left;}#searchtable .btnSubmit:hover{text-decoration:none; background-position:0 -32px;}#searchtable .btnSubmit:active{background-position:0 -64px;}#searchtable .fBtn:hover{color:#000;}table.datagrid {border:1px solid #DDDDDD;border-collapse:collapse;}.gover_search{ position:relative; z-index:99; height:33px; padding:15px 0 0 20px; border:1px solid #b8cfe6; border-bottom:0; background:#E4E9F2;border-bottom:1px solid #C8CFDA;}.gover_search_form{height:36px;}.gover_search .search_t{ float:left; width:112px; line-height:26px; color:#666666;}.gover_search .input_search_key{ float:left; width:462px; height:18px; padding:3px; margin-right:5px; border:1px solid #cccccc; line-height:18px; background:#FFFFFF;}.gover_search .search_btn{ padding-left:4px; width:68px; height:26px; overflow:hidden; border:1px solid #cccccc; text-align:center; color:#ffffff; letter-spacing:5px; background: #6B9F40 url(../images/buttonbg01.png) repeat-x 0 0; cursor:pointer; font-weight:bold;}.gover_search .search_suggest{ position:absolute; z-index:999; left:132px; top:41px; width:468px; border:1px solid #999999; display:none; }.gover_search .search_suggest li{height:24px; overflow:hidden; padding-left:3px; line-height:24px; background:#FFFFFF; cursor:default;}.gover_search .search_suggest li.hover{background:#DDDDDD;}
后台的webservice代码这里就不展示了，主要就是查询数据库返回一个JSON格式的查询结果给Jquery中的Data
