Problem with the ajax app

I am trying to build a small app in which there is a text box and when a user inputs any value in the text box , after the value is put in it the ajax code should check with the server whether there is any data in the database with that same value .If there is then a small message should appear at the side of the text box stating that the value is not available

the code is as follows

<html>
 <head><title>App2</title>
 <script type="text/javascript">
 function meth(username){					//alert("*");
	
	with(username){
										//alert(username.value);
			try{
				xmlHttp = new XMLHttpRequest("Microsoft.XMLHTTP");
			}catch(e){
				try{
					xmlHttp = new ActiveXObject("Msxml2.XMLHTTP");
					}catch(e){
						try{
							xmlHttp = new ActiveXObject("Microsoft.XMLHTTP");
						}catch(e){
							// Something went wrong
							alert("Your browser broke!");
							return false;
						}

}
			}
			xmlHttp.open("GET","serv.do",false);
			xmlHttp.send(null);
			document.getElementById('usr').innerHTML = xmlHttp.responseText;
	}
 
 
 }
 function meth1(){
	 
	 alert("*");
	 }
 </script>
 <link rel="stylesheet" type="text/css" href="css/cstylesheet.css"/>
 </head>
 <body>
 <form action="serv.do" >
 <h3>username</h3><input type="text" name="username" onblur="meth(this)" /><div id="usr"></div>
 <h3>password</h3><input type="password" name="password"/>
 <input type="submit" value="submit" />
</form>

</body>
</html>

web.xml
[code]  <web-app>
<welcome-file-list>
	<welcome-file>index.jsp</welcome-file>
</welcome-file-list>

<servlet>
	<servlet-name>serv</servlet-name>
	<servlet-class>com.servlet.serv</servlet-class>
</servlet>
<servlet-mapping>
	<servlet-name>serv</servlet-name>
	<url-pattern>/serv.do</url-pattern>
</servlet-mapping>

</web-app>

bean code

package com.bean;
import java.sql.*;

public class Model{

public void getData()throws SQLException{
		try{
		Class.forName("com.mysql.jdbc.Driver");
		Connection  con = DriverManager.getConnection("jdbc:mysql://localhost:3306/","his1","his1");
		Statement st = con.createStatement();
		ResultSet rs = st.executeQuery("select * from test.user");
		while(rs.next()){System.out.println(rs.getString(2));}

}catch(ClassNotFoundException e){e.printStackTrace();}
	}

public String isData(String username){
		String flg = "";
		try{
			
			Class.forName("com.mysql.jdbc.Driver");
			Connection con = DriverManager.getConnection("jdbc:mysql://localhost:3306/","his1","his1");
			PreparedStatement st = con.prepareStatement("select count(username) from test.user where username=?");
			st.setString(1,username);
			ResultSet rs = st.executeQuery();
			while(rs.next()){
				flg = rs.getString(1);   System.out.println(flg);
			}
	
		}catch(SQLException e){e.printStackTrace();}catch(ClassNotFoundException e){e.printStackTrace();}
		return flg;
	}
}

the page which needs to be displayed next to the text box

but here is the problem when ever i put the value in the text box i am getting the same message as available .....even if i put the value from the textbox

in JavaScript you should never use "with". http://www.yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/

Do you see a problem here? xmlHttp.open("GET","serv.do",false);

I do.

Eric

Eric Pascarello wrote:in JavaScript you should never use "with". http://www.yuiblog.com/blog/2006/04/11/with-statement-considered-harmful/

Do you see a problem here? xmlHttp.open("GET","serv.do",false);

I do.

Eric

Eric could you please tell me what is the problem with the code which you have mentioned above ..

You are not sending up any form data to the server. The XMLHttpRequest object does not send up form fields like a normal form submission does.

Ajax 101

Eric

Eric Pascarello wrote:You are not sending up any form data to the server. The XMLHttpRequest object does not send up form fields like a normal form submission does.

Ajax 101

Eric

So what should the code be . I though with ajax you could send the field to the server . What should i do then?

Varun Nayudu wrote:

Eric Pascarello wrote:You are not sending up any form data to the server. The XMLHttpRequest object does not send up form fields like a normal form submission does.

Ajax 101

Eric

So what should the code be . I though with ajax you could send the field to the server . What should i do then?

I was able to rectify it .Thanks eric for the info
xmlHttp.open("GET","serv.do?username="+username.value,false);

now its working fine