插件根据实际需要在单功能上封装的，实现传入后台数据地址，要保存值的input,前台要传入的参数（过滤条件），来返回下拉提示数据，数据过多可上下滚动选择，选择后显示文本与对应的值，供后台操作，如图：
js封装：
/* /// <reference path="jquery-autocomplete2.0.js" /> zhangs 20140516 */ (function($) { $.fn.combox = function(options) { var KEY = { UP: 38, DOWN: 40, DEL: 46, TAB: 9, RETURN: 13, //回车 ESC: 27, COMMA: 188, PAGEUP: 33, PAGEDOWN: 34, BACKSPACE: 8 }; //默认属性 var defaults = { hidvalueid: "combox_hid_value", //保存选中元素值的input的ID boxwidth: "150px", //文本框宽度 url: "", //提交的页面/方法名，URL ="AsynHandler.ashx?ywtype=GetUserNameList" param: null//要发送到服务端参数格式，主要是要动态取值的参数：[{ keyname: "catalog", keyvalue: "txtCata" }, { keyname: "cba", keyvalue: "txtCata2"},……] }; var options = $.extend(defaults, options); //将传入的参数进行合并 var hidvalue = $("#" + defaults.hidvalueid); //选中的值 //实现功能 return this.each(function() { var cb = $(this); //输入框<div id="searchresult" style="display: none;"/> cb.width(defaults.boxwidth); var id = cb.attr("id"); var searchresultdiv = $("<div id=‘" + id + "_searchresult‘ style=‘display: none;‘ />").insertAfter(cb); searchresultdiv.addClass("searchresult").width(defaults.boxwidth); var strTmp = ""; if (defaults.url.indexOf("?") == -1) { strTmp += "?"; } else { strTmp += "&"; } cb.keyup(function(evt) { changeCoords(); //控制查询结果div坐标 var k = window.event ? evt.keyCode : evt.which; //输入框的id为txt_search，这里监听输入框的keyup事件 //不为空 && 不为上箭头或下箭头或回车 if (cb.val() != "" && k != KEY.UP && k != KEY.DOWN && k != KEY.RETURN) { var strTmp2 = ""; //拼接传入的参数 if (defaults.param != null) { $.each(defaults.param, function(i, item) { if (typeof item.keyvalue != "string") { alert("控件参数格式有错误，请检查"); return; } var value = $("#" + item.keyvalue).val(); if (value != "" || value != null) { strTmp2 += item.keyname + "=" + escape(value) + "&"; } }); } var sUrl = defaults.url + strTmp + strTmp2 + "key=" + escape(cb.val()) + "&rdnum=" + Math.random(); $.ajax({ type: ‘GET‘, async: false, //同步执行，不然会有问题 dataType: "json", url: sUrl, //提交的页面/方法名 //data: , //参数（如果没有参数：null） contentType: "application/json; charset=utf-8", error: function(msg) {//请求失败处理函数 alert("数据加载失败"); }, success: function(data) { //请求成功后处理函数。 showlist(data); } }); } else if (k == KEY.UP) {//上箭头 $(‘#‘ + id + ‘_combox_table tr.combox-hover‘).prev().addClass("combox-hover").width(defaults.boxwidth); $(‘#‘ + id + ‘_combox_table tr.combox-hover‘).next().removeClass("combox-hover"); var tr_box_hover = $(‘#‘ + id + ‘_combox_table tr.combox-hover‘); if (tr_box_hover.position() != undefined) { if (tr_box_hover.position().top < 0) { //向上滚动遮住的部分+本身的高度+padding高度 searchresultdiv.scrollTop(searchresultdiv.scrollTop() - (tr_box_hover.height() - tr_box_hover.position().top + 4)); } cb.val($(‘#‘ + id + ‘_combox_table tr.combox-hover‘).text()); hidvalue.val($(‘#‘ + id + ‘_combox_table tr.combox-hover td‘).attr("value")); } } else if (k == KEY.DOWN) {//下箭头 if ($(‘#‘ + id + ‘_combox_table tr.combox-hover‘).size() == 0) { $(".combox-line:first").addClass("combox-hover").width(defaults.boxwidth); //若无选中的，则选中第一个 } else { $(‘#‘ + id + ‘_combox_table tr.combox-hover‘).next().addClass("combox-hover").width(defaults.boxwidth); $(‘#‘ + id + ‘_combox_table tr.combox-hover‘).prev().removeClass("combox-hover"); var tr_box_hover = $(‘#‘ + id + ‘_combox_table tr.combox-hover‘); if (tr_box_hover.position().top + tr_box_hover.height() > searchresultdiv.height()) { //向下滚动遮住的部分+本身高度+padding高度 searchresultdiv.scrollTop(searchresultdiv.scrollTop() + tr_box_hover.height() + (tr_box_hover.position().top + tr_box_hover.height()) - searchresultdiv.height() + 4); } } cb.val($(‘#‘ + id + ‘_combox_table tr.combox-hover‘).text()); hidvalue.val($(‘#‘ + id + ‘_combox_table tr.combox-hover td‘).attr("value")); } else if (k == KEY.RETURN) {//回车 if ($(‘#‘ + id + ‘_combox_table tr.combox-hover‘).text() != "") { cb.val($(‘#‘ + id + ‘_combox_table tr.combox-hover‘).text()); hidvalue.val($(‘#‘ + id + ‘_combox_table tr.combox-hover td‘).attr("value")); } searchresultdiv.empty(); searchresultdiv.css("display", "none"); } else { searchresultdiv.empty(); hidvalue.val(""); //为空时，值也为空 searchresultdiv.css("display", "none"); } }); searchresultdiv.bind("mouseleave", function() { searchresultdiv.empty(); searchresultdiv.css("display", "none"); }); //根据data生成下拉列表 function showlist(data) { if (data == "false") { return; } if (data.length > 0) { var layer = ""; layer = "<table id=‘" + id + "_combox_table‘>"; $.each(data, function(idx, item) { layer += "<tr class=‘combox-line‘ style=‘width:" + defaults.boxwidth + "‘><td style=‘width:" + defaults.boxwidth + "‘ value=‘" + item.Value + "‘>" + item.Name + "</td></tr>"; }); layer += "</table>"; //将结果添加到div中 searchresultdiv.empty(); searchresultdiv.append(layer); //$(".combox-line:first").addClass("combox-hover"); //初始化时不能显示，此时回车不会选中第一个 searchresultdiv.css("display", ""); //鼠标移动事件 $(".combox-line").hover(function() { $(".combox-line").removeClass("combox-hover"); $(this).addClass("combox-hover").width(defaults.boxwidth); }, function() { $(this).removeClass("combox-hover"); //searchresultdiv.css("display", "none"); }); //鼠标点击事件 $(".combox-line").click(function() { cb.val($(this).text()); hidvalue.val($(this).children()[0].value); searchresultdiv.css("display", "none"); }); } else { searchresultdiv.empty(); searchresultdiv.css("display", "none"); } } //设置查询结果div坐标 function changeCoords() { var left = cb.position().left; //获取距离最左端的距离，像素，整型 var top = cb.position().top + 20; ; //获取距离最顶端的距离，像素，整型（20为搜索输入框的高度） searchresultdiv.css("left", left + "px"); //重新定义CSS属性 searchresultdiv.css("top", top + "px"); //同上 } return cb; }); }; })(jQuery);
对应css
.searchresult { max-height:200px; position: absolute; z-index: 1; overflow: auto; left: 130px; top: 71px; background: #E0E0E0; border-top: none; } .combox-line { font-size: 12px; background: #E0E0E0; padding: 2px; } .combox-hover { background: #007ab8; color: #fff; }
前台引用这两个文件后调用，这里要注意的是param参数，如果有其它控件要控制此提示框内容过滤条件，则将对应名与控件id传入，如下类别名catalog，对应txtCata控件，多个可按此格式传入，后台会通过context.Request["catalog"]取到txtCata的值，若有文本作为过滤条件，直接拼接在url中：
<link href="style/jquery-autocomplete2.0.css" rel="stylesheet" type="text/css" /> <script src="scripts/jquery-1.6.2.min.js" type="text/javascript"></script> <script src="scripts/jquery-autocomplete2.0.js" type="text/javascript"></script> <script type="text/javascript"> $(function() { var strurl = "AsynHandler.ashx?ywtype=GetUserNameList"; $("#txt_search").combox({ hidvalueid: "hidselvalue",boxwidth:"150px", url: strurl, param: [{ keyname: "catalog", keyvalue: "txtCata" }, { keyname: "cba", keyvalue: "txtCata1"}] }); $("#form1").keydown(function() { //防止选中后回车提交表单 return (event.keyCode != 13); }); }); </script>
form表单：
<form id="form1" runat="server"> <div style="width:300px"> 智能模糊查询提示 <input id="txt_search" type="text" runat="server" /> <input id="hidselvalue" type="hidden" runat="server" /> </div> </form>
其中txt_search为要显示内容的input，hidselvalue为要保存选中值，在后台可用hidselvalue.Value来取得（因为要在后台取值，所以没有封装进去，主要用于NET后台）
异步页面AsynHandler.ashx：
using System; using System.Collections.Generic; using System.Linq; using System.Web; using System.Web.Services; using System.Text; using System.Data; namespace WebApp { /// <summary> /// $codebehindclassname$ 的摘要说明 /// </summary> [WebService(Namespace = "http://tempuri.org/")] [WebServiceBinding(ConformsTo = WsiProfiles.BasicProfile1_1)] public class AsynHandler : IHttpHandler { public bool IsReusable { get { return false; } } /// <summary> /// post方法接收数据 /// </summary> /// <param name="context">HttpContext</param> public string getPostStr(HttpContext context) { Int32 intLen = Convert.ToInt32(context.Request.InputStream.Length); byte[] b = new byte[intLen]; context.Request.InputStream.Read(b, 0, intLen); return System.Text.Encoding.UTF8.GetString(b); } public void ProcessRequest(HttpContext context) { context.Response.ContentType = "text/plain"; string ywtype = context.Request["ywtype"]; string strReturn = String.Empty; //返回值 switch (ywtype) { case "GetUserNameList": strReturn = GetUserNameList(context); break; default: strReturn = "false"; break; } context.Response.Write(strReturn); } private string GetUserNameList(HttpContext context) { StringBuilder returnStr = new StringBuilder(); string userName = context.Request["key"]; userName = HttpUtility.UrlDecode(userName); List<ConboxItem> conboxlist = new List<ConboxItem>(); ConboxItem item = new ConboxItem("政治", "zz"); conboxlist.Add(item); item = new ConboxItem("acb", "zz"); conboxlist.Add(item); item = new ConboxItem("语言", "yy"); conboxlist.Add(item); item = new ConboxItem("三个", "sg"); conboxlist.Add(item); item = new ConboxItem("数据", "sj"); conboxlist.Add(item); item = new ConboxItem("英文", "yw"); conboxlist.Add(item); item = new ConboxItem("a", "yw"); conboxlist.Add(item); item = new ConboxItem("acb1", "zz1"); conboxlist.Add(item); item = new ConboxItem("a", "yw"); conboxlist.Add(item); item = new ConboxItem("acb1", "zz1"); conboxlist.Add(item); item = new ConboxItem("a", "yw"); conboxlist.Add(item); item = new ConboxItem("acb1", "zz1"); conboxlist.Add(item); item = new ConboxItem("a", "yw"); conboxlist.Add(item); item = new ConboxItem("acb1", "zz1"); conboxlist.Add(item); item = new ConboxItem("a", "yw"); conboxlist.Add(item); item = new ConboxItem("acb1", "zz1"); conboxlist.Add(item); item = new ConboxItem("语言1", "yy1"); conboxlist.Add(item); item = new ConboxItem("三个1", "sg1"); conboxlist.Add(item); item = new ConboxItem("数据1", "sj1"); conboxlist.Add(item); item = new ConboxItem("英文1", "yw2"); conboxlist.Add(item); item = new ConboxItem("a1", "yw1"); conboxlist.Add(item); List<ConboxItem> resultlist = conboxlist.Where(p => p.Name.Contains(userName)).ToList(); if (resultlist.Count > 0) { returnStr.Append(ToJson(resultlist)); return returnStr.ToString(); } else { item = new ConboxItem("未查询到记录！", ""); resultlist.Add(item); return ToJson(resultlist); } } #region List转换成Json格式 /// <summary> /// List转换成Json格式 /// </summary> /// <param name="dt"></param> /// <returns></returns> public static string ToJson(List<ConboxItem> conboxlist) { StringBuilder jsonBuilder = new StringBuilder(); jsonBuilder.Append("["); for (int i = 0; i < conboxlist.Count; i++) { jsonBuilder.Append("{"); jsonBuilder.Append("\""); jsonBuilder.Append("Name"); jsonBuilder.Append("\":\""); jsonBuilder.Append(conboxlist[i].Name); jsonBuilder.Append("\","); jsonBuilder.Append("\""); jsonBuilder.Append("Value"); jsonBuilder.Append("\":\""); jsonBuilder.Append(conboxlist[i].Value); jsonBuilder.Append("\","); jsonBuilder.Remove(jsonBuilder.Length - 1, 1); jsonBuilder.Append("},"); } jsonBuilder.Remove(jsonBuilder.Length - 1, 1); jsonBuilder.Append("]"); return jsonBuilder.ToString(); } #endregion #region dataTable转换成Json格式 /// <summary> /// dataTable转换成Json格式 /// </summary> /// <param name="dt"></param> /// <returns></returns> public static string ToJson(DataTable dt) { StringBuilder jsonBuilder = new StringBuilder(); jsonBuilder.Append("["); for (int i = 0; i < dt.Rows.Count; i++) { jsonBuilder.Append("{"); for (int j = 0; j < dt.Columns.Count; j++) { jsonBuilder.Append("\""); jsonBuilder.Append(dt.Columns[j].ColumnName); jsonBuilder.Append("\":\""); jsonBuilder.Append(dt.Rows[i][j].ToString()); jsonBuilder.Append("\","); } jsonBuilder.Remove(jsonBuilder.Length - 1, 1); jsonBuilder.Append("},"); } jsonBuilder.Remove(jsonBuilder.Length - 1, 1); jsonBuilder.Append("]"); return jsonBuilder.ToString(); } #endregion public class ConboxItem { public string Name { get; set; } public string Value { get; set; } public ConboxItem(string Name, string Value) { this.Name = Name; this.Value = Value; } } } }