ajax中实现提示框

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【软件开发】

Ajax Servlet JavaScript HTML Cache

Color=#cccccc cellSpacing=0 cellPadding=1 width="80%" align=center bgColor=#ffffff border=1 heihgt="">
tooTip.html:

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN">

<html>
<head>
    <title>Ajax Tooltip</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 = "ToolTipServlet?key=" + escape(element.id);

            xmlHttp.open("GET", url, true);
            xmlHttp.onreadystatechange = callback;
            xmlHttp.send(null);
        }

        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>Ajax Tooltip Example</h1>
    <h3>Golf Courses</h3>
    <table id="courses" bgcolor="#FFFAFA" border="1" cellspacing="0" cellpadding="2"/>
        <tbody>
            <tr><td id="1" onmouseover="getCourseData(this);" onmouseout="clearData();">Augusta National</td></tr>
            <tr><td id="2" onmouseover="getCourseData(this);" onmouseout="clearData();">Pinehurst No. 2</td></tr>
            <tr><td id="3" onmouseover="getCourseData(this);" onmouseout="clearData();">St. Andrews Links</td></tr>
            <tr><td id="4" onmouseover="getCourseData(this);" onmouseout="clearData();">Baltusrol Golf Club</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>

ToolTipServlet.java:

/*
* ToolTipServlet.java
*
* Created on June 30, 2005, 8:29 PM
*/

package ajaxbook.chap4;

import java.io.*;
import java.util.HashMap;
import java.util.Map;

import javax.servlet.*;
import javax.servlet.http.*;

/**
*
* @author nate
* @version
*/
public class ToolTipServlet extends HttpServlet {

private Map courses = new HashMap();

    public void init(ServletConfig config) throws ServletException {
        CourseData augusta = new CourseData(72, 7290);
        CourseData pinehurst = new CourseData(70, 7214);
        CourseData standrews = new CourseData(72, 6566);
        CourseData baltusrol = new CourseData(70, 7392);
        courses.put(new Integer(1), augusta);
        courses.put(new Integer(2), pinehurst);
        courses.put(new Integer(3), standrews);
        courses.put(new Integer(4), baltusrol);
    }

    /** Handles the HTTP <code>GET</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doGet(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        Integer key = Integer.valueOf(request.getParameter("key"));
        CourseData data = (CourseData) courses.get(key);

        PrintWriter out = response.getWriter();

response.setContentType("text/xml");
response.setHeader("Cache-Control", "no-cache");

        out.println("<response>");
        out.println("<par>" + data.getPar() + "</par>");
        out.println("<length>" + data.getLength() + "</length>");
        out.println("</response>");
        out.close();
    }

    /** Handles the HTTP <code>POST</code> method.
     * @param request servlet request
     * @param response servlet response
     */
    protected void doPost(HttpServletRequest request, HttpServletResponse response)
    throws ServletException, IOException {
        doGet(request, response);
    }

    /** Returns a short description of the servlet.
     */
    public String getServletInfo() {
        return "Short description";
    }

    private 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;
        }
    }
}

注释：提示框的位置是计算距离顶部的距离

eg:

假设 obj 为某个 HTML 控件。

obj.offsetTop 指 obj 距离上方或上层控件的位置，整型，单位像素。

obj.offsetLeft 指 obj 距离左方或上层控件的位置，整型，单位像素。

obj.offsetWidth 指 obj 控件自身的宽度，整型，单位像素。

obj.offsetHeight 指 obj 控件自身的高度，整型，单位像素。

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