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ASP模仿google suggest风格实现下拉菜单效果

程序员文章站 2022-03-26 08:58:13
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...

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?names=" + 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" class="inputtext" id="frmchangshang" style="width:250px;" 

onblur="disselect();" onkeyup="findnames();" size="50" maxlength="100">
           <span class="style1">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 style="position:absolute;top:0;left:0;" 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。

<!--#include virtual="conn.asp" -->
<%
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 "<?xml version=""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。