今天和大家一起利用ASP模仿实现google suggest风格的下拉菜单，直接上代码
1.前台代码：
<%@LANGUAGE="JAVASCRIPT" CODEPAGE="936"%> <!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Transitional//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-transitional.dtd"> <html xmlns="http://www.w3.org/1999/xhtml"> <style type="text/css"> <!-- .style1 {color: #FF0000} .mouseOut { font-size:12px; background: #708090; color: #FFFAFA; } .mouseOver { font-size:12px; background: #FFFAFA; color: #000000; } --> </style> <script type="text/javascript" language="javascript"> var xmlHttp; var completeDiv; var inputField; var nameTable; var nameTableBody; var flag=false; function createXMLHttpRequest() { if (window.ActiveXObject) { xmlHttp = new ActiveXObject("Microsoft.XMLHTTP"); } else if (window.XMLHttpRequest) { xmlHttp = new XMLHttpRequest(); } } function setflag(){ flag = true; } function DisSelect() { if(flag==false) document.getElementById("popup").style.display="none"; } function initVars() { inputField = document.getElementById("frmchangshang"); nameTable = document.getElementById("name_table"); completeDiv = document.getElementById("popup"); nameTableBody = document.getElementById("name_table_body"); document.getElementById("popup").style.display="block"; } function findNames() { initVars(); if (inputField.value.length > 0) { createXMLHttpRequest(); var url = "search.asp" + inputField.value; xmlHttp.open("GET", url, true); xmlHttp.onreadystatechange = callback; xmlHttp.send(null); } else { clearNames(); } } function callback() { if (xmlHttp.readyState == 4) { if (xmlHttp.status == 200) { try { var name = xmlHttp.responseXML.getElementsByTagName("name") [0].firstChild.data; } catch(e) { document.getElementById("popup").style.display="none"; clearNames(); } setNames(xmlHttp.responseXML.getElementsByTagName("content")); } else if (xmlHttp.status == 204) { clearNames(); } } } function setNames(the_names) { clearNames(); var size = the_names.length; setOffsets(); var row,cell,spans; for (var i = 0; i < size; i++) { //var nextNode = the_names[i].firstChild.data; var e = the_names[i]; //取得子节点内容，重新装载为数组 var nextNode=e.getElementsByTagName("name")[0].firstChild.data; //创建tr，td，span元素 row=document.createElement("tr"); cell =document.createElement("td"); //spans=document.createElement("span"); //设置cell属性 cell.onmouseout = function() {this.className='mouseOver'; flag=false;}; cell.onmouseover = function() {this.className='mouseOut'; flag=true;}; cell.setAttribute("bgcolor","#FFFAFA"); cell.setAttribute("border","0"); //cell.setAttribute("onmouseover","setflag()"); cell.onclick = function() { populateName(this); }; //将nextNode添加到td var txtName = document.createTextNode(nextNode); cell.appendChild(txtName); //装载隐藏数据到span元素 row.appendChild(cell); nameTableBody.appendChild(row); } } function setOffsets() { var end = inputField.offsetWidth; var left = calculateOffsetLeft(inputField); var top = calculateOffsetTop(inputField) + inputField.offsetHeight; completeDiv.style.border = "black 1px solid"; completeDiv.style.left = left + "px"; completeDiv.style.top = top + "px"; nameTable.style.width="400px"; } function calculateOffsetLeft(field) { return calculateOffset(field, "offsetLeft"); } function calculateOffsetTop(field) { return calculateOffset(field, "offsetTop"); } function calculateOffset(field, attr) { var offset = 0; while(field) { offset += field[attr]; field = field.offsetParent; } return offset; } function populateName(cell) { //填充数据到web页面，cell---->td对象 inputField.value = cell.firstChild.nodeValue; clearNames(); } //清除列表数组 function clearNames() { var ind = nameTableBody.childNodes.length; for (var i = ind - 1; i >= 0 ; i--) { nameTableBody.removeChild(nameTableBody.childNodes[i]); } completeDiv.style.border = "none"; } </script> <head> <meta http-equiv="Content-Type" content="text/html; charset=gb2312" /> <title>Untitled Document</title> </head> <body> <input name="frmchangshang" id="frmchangshang"style="width:250px;" onBlur="DisSelect();" onKeyUp="findNames();" size="50" maxlength="100"> <span>提示：输入关键字，程序自动从库中匹配您 要找的记录，如果不存在自行填写 </span> <div id="popup"> <table id="name_table" bgcolor="#FFFAFA" border="0" cellspacing="0" cellpadding="0"> <tbody id="name_table_body"></tbody> </table> </div> </body> </html>
2.后台search.asp异步查询数据页面
把sql语句和要显示的字段改为自己的数据库相对应格式就可以了。
<> <% keyword=request.QueryString("names") sql="select lgid,lgmc from lg where lgmc like '%"&keyword&"%' order by lgid desc" set rs=server.CreateObject("adodb.recordset") rs.open sql,conn,1,1 Response.ContentType="text/xml" response.Write "<"1.0"" encoding=""GB2312"" " response.Write "<response>" do while not rs.eof response.Write "<content>" response.Write "<name>"&rs("lgmc")&"</name>" 'response.Write "<userid>"&rs("userid")&"</userid>" 'response.Write "<startime>"&rs("startime")&"</startime>" 'response.Write "<endtime>"&rs("endtime")&"</endtime>" response.Write "</content>" rs.movenext loop response.Write "</response>" rs.close set rs=nothing %>
以上就是ASP模仿google suggest风格实现下拉菜单效果的代码，希望对大家的学习有所帮助。
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