ajax.asp

实现文本框自动查询的功能

<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="250px";
        }
        
        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">
                    &nbsp;<span class="style1">
         </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>
<p>&nbsp;</p>
</body>
</html>