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Help for Check availability of user
1 Answer(s)      3 years and 7 months ago
Posted in : JSP-Servlet

I need the code for check availability of users in the database before login.I placed a button for Check Availability.Can it be done with this or ajax should be used?

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February 14, 2011 at 12:11 PM

JSP Check availability of User using Ajax


<script type="text/javascript">
function check(value){ 
var url="checkajax.jsp";
function stateChanged(){ 
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){ 
    var showdata = xmlHttp.responseText; 
    document.getElementById("mydiv").innerHTML= showdata;
function GetXmlHttpObject(){
var xmlHttp=null;
  xmlHttp=new XMLHttpRequest();
catch (e) {
 try {
  xmlHttp=new ActiveXObject("Msxml2.XMLHTTP");
 catch (e){
  xmlHttp=new ActiveXObject("Microsoft.XMLHTTP");
return xmlHttp;
<form name="form">
 UserName: <input  type="text" name="name" id="name" onkeyup="check(this.value);"><font color="red"><div id="mydiv"></div></font>



<%@ page import="java.sql.*" %> 
String name = request.getParameter("name").toString();
String data ="";
           Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/test", "root", "root");
           Statement st=con.createStatement();
           ResultSet rs=st.executeQuery("select * from login where username='"+name+"'");
int count=0;


             data="Not Available";
catch (Exception e) {


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