Ajax_创建工具提示

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Ajax技术应用

Ajax Cache JSP JavaScript Microsoft

JSP部分：

<%@ page language="java" import="java.util.*" pageEncoding="gbk"%>

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

   <title>My JSP 'index.jsp' starting page</title>
   <meta http-equiv="pragma" content="no-cache">
   <meta http-equiv="cache-control" content="no-cache">
   <meta http-equiv="expires" content="0">
   <meta http-equiv="keywords" content="keyword1,keyword2,keyword3">
   <meta http-equiv="description" content="This is my page">
   <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);
　　}

Servlet部分：

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);
}

public void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
this.doPost(request, response);
}

public void doPost(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();
}

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;
   }
}
}

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Ajax_显示进度条 | Ajax_动态更新Web页面

2009-04-21 18:34
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