Client side validation without using Javascript or VB Script

You will have a VERY limited option if you don't want to use Javascript (don't know why). You have validation as an attribute of a field (for example, maxlengthin an input field) that are very limited . Client-side validation is always performed along with server-side validation. They complement each other.

HTML Servlet :

String uName= request.getParameter("userName");
String pwd= request.getParameter("password");
PrintWriter out= response.getWriter();

if(uName.equals("username") && pwd.equals("password")){

out.println("Valid User");

}

else
out.println("Invalid User");

formcheck: - mootools validations.. .

http://mootools.floor.ch/en/demos/formcheck/