refreshing a jsp without flickering effect for every 5 seconds using ajax
I want to refresh a jsp without flickering for every 5 seconds using ajax.This jsp is responsible to get the new records from the database and display the records in the form of a table. I don't know how to use ajax. Please send me one example for the same. Please help me. Please send your answer to.
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July 18, 2011 at 4:28 PM
1)ajax.jsp:
<%@page import="java.sql.*"%>
<META HTTP-EQUIV="Refresh" CONTENT="5">
<html>
<head>
<script type="text/javascript">
function showData(){
xmlHttp=GetXmlHttpObject()
var url="getdata.jsp";
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged(){
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
document.getElementById("tab").innerHTML=xmlHttp.responseText;
}
}
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;
}
</script>
</head>
<body onload="showData();">
<table id="tab">
</table>
</body>
</html>
2)getdata.jsp:
<%@ page import="java.sql.*" %>
<%
String buffer="<table id='tab' border='1' >";
try{
Class.forName("com.mysql.jdbc.Driver");
Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
Statement stmt = con.createStatement();
ResultSet rs = stmt.executeQuery("Select * from employee");
while(rs.next()){
buffer=buffer+"<tr><td>"+rs.getString("name")+"</td><td>"+rs.getString("address")+"</td><td>"+rs.getString("contactNo")+"</td><td>"+rs.getString("email")+"</td></tr>";
}
buffer=buffer+"</table>";
response.getWriter().println(buffer);
System.out.println(buffer);
}
catch(Exception e){
System.out.println(e);
}
%>
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