Using Ajax after an year...please tell me what I'm missing:
JSP/Ajax File:
<%@ 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=ISO-8859-1">
<title>Insert title here</title>
<script type="text/javascript">
function login() {
var xmlhttp;
var username = document.getElementById('username').value;
var queryString = "username="+username;
if(window.XMLHttpRequest){
xmlhttp = new XMLHttpRequest();
}else{
xmlhttp = new ActiveXObject("Microsoft.XMLHTTP");
}
xmlhttp.open("GET", "LoginServlet", true);
xmlhttp.setRequestHeader("Content-type","application/x-www-form-urlencoded");
alert(queryString);
xmlhttp.send(queryString);
xmlhttp.onreadystatechange = function(){
if(xmlhttp.readyState == 4 && xmlhttp.status == 200){
alert(xmlhttp.responseText);
}
};
}
</script>
</head>
<body>
<input type="text" name="username" id="username" />
<input type="button" onclick="javascript:login()" value="login" />
</body>
</html>Servlet:
package Servlets;
import java.io.IOException;
import java.io.PrintWriter;
import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
@WebServlet("/LoginServlet")
public class LoginServlet extends HttpServlet {
private static final long serialVersionUID = 1L;
public LoginServlet() {
super();
}
protected void doGet(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
System.out.println("Servlet Called");
PrintWriter out = response.getWriter();
response.setContentType("text/html");
String queryString = request.getParameter("username").toString();
out.println(queryString);
}
protected void doPost(HttpServletRequest request, HttpServletResponse response) throws ServletException, IOException {
// TODO Auto-generated method stub
}
}Thank You