Ajax:创建提示工具 

<html xmlns="http://www.w3.org/1999/xhtml">
<head>
    <title>自动提示功能</title>
    <script type="text/javascript">
        var xmlHttp;
        var dataDiv;
        var dataTable;
        var dataTableBody;
        var offSetEl;
        function createXMLHttpRequest() {
            if (window.ActiveXObject) {
                xmlHttp = new ActiveXObject("Microsoft.XMLHTTp");
            }
            else if (window.XMLHttpRequest) {
                xmlHttp = new XMLHttpRequest();
            }
        }
        function initVars() {
            dataTableBody = document.getElementById("courseDataBody");
            dataTable = document.getElementById("courseData");
            dataDiv = document.getElementById("popup");
        }
        function getCourseData(element) {
            initVars();
            createXMLHttpRequest();
            offSetEl = element;
            var url = "WS.asmx/AutoToolTip?key=" + escape(element.id);
            xmlHttp.onreadystatechange = callback;
            xmlHttp.open("GET", url, true);
            xmlHttp.send(null);

        }

        function callback() {
            if (xmlHttp.readyState == 4) {
                if (xmlHttp.status == 200) {
                    setData(xmlHttp.responseXML);
                }
            }
        }
        function setData(courseData) {
            clearData();
            setOffsets();

            var length = courseData.getElementsByTagName("length")[0].firstChild.data;
            var par = courseData.getElementsByTagName("par")[0].firstChild.data;
            var row, row2;
            var parData = "Par:" + par;
            var lengthData = "Length:" + length;

            row = createRow(parData);
            row2 = createRow(lengthData);
            dataTableBody.appendChild(row);
            dataTableBody.appendChild(row2);
        }

        function createRow(data) {

            var row, cell, txtNode;
            row = document.createElement("tr");
            cell = document.createElement("td");
            cell.setAttribute("bgcolor", "#FFFAFA");
            cell.setAttribute("border", "0");

            txtNode = document.createTextNode(data);
            cell.appendChild(txtNode);
            row.appendChild(cell);

            return row;
        }

        function setOffsets() {

            var end = offSetEl.offsetWidth;
            var top = calculateOffsetTop(offSetEl);
            dataDiv.style.border = "black 1px solid";
            dataDiv.style.left = end + 15 + "px";
            dataDiv.style.top = top + "px";
        }

        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 clearData() {
            var ind = dataTableBody.childNodes.length;
            for (var i = ind - 1; i >= 0; i--) {
                dataTableBody.removeChild(dataTableBody.childNodes[i]);
            }
            dataDiv.style.border = "none";
        }
    </script>
</head>
<body>
    <h1>
        自动提示</h1>
    <h3>
        课程</h3>
    <table id="courses" bgcolor="#FFFAFA" border="1" cellspacing="0" cellpadding="2">
        <tbody>
            <tr>
                <td id="1" onmousemove="getCourseData(this);" onmouseout="clearData();">
                    课程1
                </td>
            </tr>
            <tr>
                <td id="2" onmousemove="getCourseData(this);" onmouseout="clearData();">
                    课程2
                </td>
            </tr>
            <tr>
                <td id="3" onmousemove="getCourseData(this);" onmouseout="clearData();">
                    课程3
                </td>
            </tr>
            <tr>
                <td id="4" onmousemove="getCourseData(this);" onmouseout="clearData();">
                    课程4
                </td>
            </tr>
        </tbody>
    </table>
    <div style="position: absolute;" id="popup">
        <table id="courseData" bgcolor="#FFFAFA" border="0" cellspacing="2" cellpadding="2">
            <tbody id="courseDataBody">
            </tbody>
        </table>
    </div>
</body>
</html>

后台代码如下：

 public class CourseData
        {
            private int par;
            private int length;

            public CourseData(int par, int length)
            {
                this.par = par;
                this.length = length;
            }
            public int GetPar()
            {
                return this.par;
            }
            public int GetLength()
            {
                return this.length;
            }
        }

        public Dictionary<int, CourseData> initData()
        {
            Dictionary<int, CourseData> courseDatas = new Dictionary<int, CourseData>();
            CourseData courseData1 = new CourseData(72, 7290);
            CourseData courseData2 = new CourseData(70, 7214);
            CourseData courseData3 = new CourseData(72, 6566);
            CourseData courseData4 = new CourseData(70, 7392);
            courseDatas[1] = courseData1;
            courseDatas[2] = courseData2;
            courseDatas[3] = courseData3;
            courseDatas[4] = courseData4;
            return courseDatas;
        }

        [WebMethod]
        public void AutoToolTip()
        {
            var task = Context.Request.QueryString["key"];
            var key = int.Parse(task);
            CourseData data = initData()[key];


            Context.Response.ContentType = "text/xml";
            Context.Response.Write("<response>");
            Context.Response.Write("<par>" + data.GetPar() + "</par>");
            Context.Response.Write("<length>" + data.GetLength() + "</length>");
            Context.Response.Write("</response>");
        }

运行效果如下：

posted on 2012-10-09 21:39  lufangtao  阅读(267)  评论(0)  编辑  收藏  举报

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