javascript validation

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maithri

javascript validation
1 Answer(s) 2 years and 3 months ago
Posted in : JSP-Servlet

How to do javascript validations to check whether the entered primary key is present in the database or not .Iam using jsp language

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March 4, 2011 at 11:54 AM

Javascript validation

1)checkid.jsp:

<%@page import="java.sql.*"%>
<html>
<head>
<script type="text/javascript">
function showData(){ 
var value=document.getElementById("id").value;

xmlHttp=GetXmlHttpObject()
var url="id.jsp";
url=url+"?id="+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; 
    alert(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>

<form name="employee">
<div id="mydiv"></div>
 <input  type="text" name="id" id="id"><input type="button" value="check" onclick="showData();">
</html>

2)id.jsp:

<%@ page import="java.sql.*" %> 
<%
String id = request.getParameter("id").toString();
System.out.println(id);
int count=0;
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 employee where id='"+id+"'");
while(rs.next())
{
count++;
}
if(count>0){
    data="It is a valid id";
}
else{
    data="It is not a valid id";
}
out.println(data);
System.out.println(data);
}
catch(Exception e) {
System.out.println(e);
}
%>

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