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how to read value from text box and alert whether it is available in database or not?
1)availability.jsp:
Share on Google+<html>
<head>
<script type="text/javascript">
function check(value){
xmlHttp=GetXmlHttpObject()
var url="check.jsp";
url=url+"?name="+value;
xmlHttp.onreadystatechange=stateChanged
xmlHttp.open("GET",url,true)
xmlHttp.send(null)
}
function stateChanged(){
if(xmlHttp.readyState==4 || xmlHttp.readyState=="complete"){
var showdata = xmlHttp.responseText;
document.getElementById("mydiv").innerHTML= showdata;
}
}
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>
<form name="form">
UserName: <input type="text" name="name" id="name" onkeyup="check(this.value);"><font color="red"><div id="mydiv"></div></font>
</form>
</body>
</html>
2)check.jsp:
<%@ page import="java.sql.*" %>
<%
String name = request.getParameter("name").toString();
System.out.println(name);
String data ="";
try{
Class.forName("com.mysql.jdbc.Driver");
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;
while(rs.next())
{
count++;
}
if(count>0)
{
data="Not Available";
}
else
{
data="Available";
}
out.println(data);
System.out.println(data);
}
catch (Exception e) {
System.out.println(e);
}
%>
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