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String user = request.getParameter("username");
in this "user" value is null or not how to validate? before going further action.
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December 13, 2010 at 5:11 PM
Hi Friend,
Either you can do the following :
1)login.jsp:
<%@page import="java.sql.*"%> <html> <form method="post" action="check.jsp"> <table> <tr><td>Username:</td><td><input type="text" name="user"></td></tr> <tr><td>Password:</td><td><input type="text" name="pass"></td></tr> <tr><td></td><td><input type="submit" value="Submit"></td></tr> </table> </form> </html>
2)check.jsp:
<%
String user=request.getParameter("user");
String pass=request.getParameter("pass");
if(user.equals("")&&pass.equals("")){
response.sendRedirect("login.jsp");
}
else{
}
%>
Or you can use JavaScript for validation like this:
<%@page import="java.sql.*"%>
<html>
<script>
function validate(){
var username=document.form.user.value;
var password=document.form.pass.value;
if(username==""){
alert('Enter Username!');
return false;
}
if(password==""){
alert('Enter Password!');
return false;
}
return true;
}
</script>
<form name="form" method="post" action="check.jsp" onsubmit="javascript:return validate();">
<table>
<tr><td>Username:</td><td><input type="text" name="user"></td></tr>
<tr><td>Password:</td><td><input type="text" name="pass"></td></tr>
<tr><td></td><td><input type="submit" value="Submit"></td></tr>
</table>
</form>
</html>
December 13, 2010 at 5:53 PM
Hi Friend,
How to get the message in login.jsp like "username or password is wrorng"
December 13, 2010 at 7:08 PM
Once validating in check.jsp, i want error message on login.jsp like 'username or password is not provided' if username or password is null.
How get above thing.
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