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AJAX自学练习 无刷新从数据库后台取数据显示

  • 时间:2022-07-21 19:24 编辑: 来源: 阅读:
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摘要:AJAX自学练习 无刷新从数据库后台取数据显示
请求页面request.jsp
[u]复制代码[/u] 代码如下:
<%@ page language="java" contentType="text/html; charset=ISO-8859-1" pageEncoding="ISO-8859-1"%> <!DOCTYPE html PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd"> <html> <head> <meta http-equiv="Content-Type" content="text/html; charset=UTF-8"> <title>Insert title here</title> <script language="javascript"><!-- function GetXmlHttpObject(){     var xmlHttp = null;     try{         xmlHttp = new XMLHttpRequest();     }catch(e){         try{             xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");         }catch(e){             xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");         }     }     return xmlHttp; } function showMsg(str){     xmlHttp = GetXmlHttpObject();     if(xmlHttp == null){         alert ("you browser don't support the ajax");          return;     }     var url = "response.jsp";     url = url + "?q="+ str;     url = url + "&sid ="+ Math.random();     xmlHttp.onreadystatechange = stateChanged;     xmlHttp.open("GET", url, true);     xmlHttp.send(null); } function stateChanged() {     if(xmlHttp.readyState==4)     {         document.getElementById("showHint").innerHTML = xmlHttp.responseText;     } } // --></script> </head> <body> <form name="form1" action="" method="post"> <p>RocarsId:</p>     <select name="select1" onchange="showMsg(document.form1.select1.options[document.form1.select1.selectedIndex].value)" >         <option value="140">140</option>         <option value="150">150</option>     </select>     <div id="showHint">Show rocars ccrn messages.</div> </form> </body> </html>
response.jsp
[u]复制代码[/u] 代码如下:
<%@ page language="java" contentType="text/plain; charset=UTF-8" pageEncoding="UTF-8"%> <%@ page import="com.lwf.eus.util.*,java.util.*,com.lwf.eus.entity.*,com.lwf.eus.bean.*" %> <html> <head> <title>response the ccrn</title> </head> <body> <%     String q = request.getParameter("q");     System.out.println("message:" + q);     RocarsBean rocars = RocarsEntity.getRocarsListById(q); %> <table> <tr> <td>RocarsId</td> <td>RocarsCcrn</td></tr> <tr> <td><%=rocars.getRocarsId() %></td> <td><%=rocars.getCcrn() %></td> </tr> </table> </body> </html>
注意这里与自学练习一不同的是,request.jsp页面用一个div来显示信息,response.jsp从数据库里面查询出来的内容放在table标签里,其它的html标签不会在div里面显示。
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