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AJAX in Spring MVC

AJAX in Spring MVC:-

..............................................................................................

 <%@ page language="java" contentType="text/html; charset=ISO-8859-1"

    pageEncoding="ISO-8859-1"%>

<!DOCTYPE html>

<html>

<head>

<meta charset="ISO-8859-1">

<title>Insert title here</title>

<script>

function searchdata(param)

{

var xmlhttp = new XMLHttpRequest();

xmlhttp.onreadystatechange=function()

{

if(param!='')

{

document.getElementById("res").innerHTML = xmlhttp.responseText;

}

else

{

document.getElementById("res").innerHTML = '';

}

}

xmlhttp.open("post","ajaxcode.do?q="+param,true);

xmlhttp.send();

}

</script>

</head>

<body>

<input type="text" placeholder="enter character" onkeyup="searchdata(this.value)" />

<div id="res"></div>

</body>

</html>


package controllers;


import javax.servlet.http.HttpServletRequest;


import org.springframework.stereotype.Controller;

import org.springframework.web.bind.annotation.RequestMapping;

import org.springframework.web.servlet.ModelAndView;


import dbhelper.Datahelper;

import models.Emp;


@Controller

public class AjaxController {

@RequestMapping("loadajax")

public String searchview()

{

return "loadajax";

}

@RequestMapping("ajaxcode")

public ModelAndView ajaxcode(HttpServletRequest request)

{

Datahelper.connect();

    return new ModelAndView("ajaxoutput","key",Datahelper.searchOperation(Emp.class,request.getParameter("q")));

}

}

ajaxoutput.jsp

<%@ page language="java" contentType="text/html; charset=ISO-8859-1"
    pageEncoding="ISO-8859-1"%>
<%@page import="java.util.*,models.*" %>
<!DOCTYPE html>
<html>
<head>
<meta charset="ISO-8859-1">
<title>Insert title here</title>
</head>
<body>
<h1>Welcome in AJAX</h1>
<table border='1' id="tabledata">
<tr><th>ID</th><th>Name</th><th>Job</th><th>Username</th><th>Password</th></tr>
<%
List data = (List)request.getAttribute("key");
Iterator it = data.iterator();
while(it.hasNext())
{
Emp obj = (Emp)it.next();
%>
<tr><td><%= obj.getEmpid() %></td><td><%= obj.getEmpname() %></td><td><%= obj.getJob() %></td><td><%= obj.getUsername() %></td><td><%= obj.getPassword() %></td><td><a href="empfind.do?q=<%= obj.getEmpid() %>">Edit</a></td><td><a href="">Delete</a></tr>  
<%
}
%>
</table>
</body>
</html>


Create Helper class

package dbhelper;

import java.util.List;

import org.hibernate.Criteria;
import org.hibernate.Query;
import org.hibernate.Session;
import org.hibernate.SessionFactory;
import org.hibernate.Transaction;
import org.hibernate.cfg.Configuration;
import org.hibernate.criterion.Criterion;
import org.hibernate.criterion.Restrictions;

import models.Emp;

public class Datahelper {
static Configuration cfg;
static SessionFactory sf;
static Session sess;
static Transaction tx;
    public static void connect()
    {
    cfg= new Configuration();
    cfg.configure("hibernate.cfg.xml");
    sf = cfg.buildSessionFactory();
    sess = sf.openSession();
    }
   
    public static void insertOperation(Object obj)
   {
   tx= sess.beginTransaction();
   sess.save(obj);
   tx.commit();
   }
    public  static void updateOperation(Object obj)
   {
   tx= sess.beginTransaction();
   sess.update(obj);
   tx.commit();
   }
    public  static void deleteOperation(Object obj)
   {
   tx= sess.beginTransaction();
   sess.delete(obj);
   tx.commit();
   }
   
    public static Query selectOperation(String query)
   {
    Query q = sess.createQuery(query);
    return q;
   }
    public static List searchOperation(Class c,String args)
    {
      Criteria q = sess.createCriteria(c);
      Criterion c1=Restrictions.like("empname",args+"%");
      q.add(c1);
      return q.list();
    }
    public static Object findOperation(Class c,Integer id)
   {
   Object o = sess.get(c,id);
   return o;
   }
   public  static void closeConn()
   {
   sess.close();
   }
   
}






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