Javascript in servlet

computerzworld

Apr 24th 2007, 5:33 am

Hi. I have tried to insert javascript in servlet. But it is not validating my form. I am giving my code along with this message. Please tell me what should I do so that I can be able to validate my page. Thanks in advance.

import java.io.*;
import java.net.*;

import javax.servlet.*;
import javax.servlet.http.*;

/**
*
* @author administrator
* @version
*/
public class login extends HttpServlet {

/** Processes requests for both HTTP <code>GET</code> and <code>POST</code> methods.
* @param request servlet request
* @param response servlet response
*/
protected void processRequest(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
response.setContentType("text/html;charset=UTF-8");
PrintWriter out = response.getWriter();

out.println("<html>");
out.println("<head>");

out.println("<script language=javascript>");
out.println("function val() {");

out.println("if(document.form.uname.value.length <1) {");

out.println("alert(Enter your first name);");
out.println("document.form.uname.focus();");
out.println("document.form.uname.style.background=pink;");

out.println("return false;");

out.println("}");
out.println("if(document.form.pass.value.length <1) {");

out.println("alert(Enter password);");
out.println("document.form.pass.focus();");
out.println("document.form.pass.style.background=pink;");

out.println("return false;");

out.println("}");
out.println("return true;");
out.println("}");

out.print("</script>");
out.println("<title>Servlet login</title>");
out.println("</head>");
out.println("<body bgcolor=#dddddd>");
out.println("<form name=form action=http://localhost:8084/servlet/val method=get onSubmit=return val()>");
out.println("<h1><p align=center> Consumer Electronics System</p><hr border=10 /></h1>");
out.println("<h3><p align=center>Administrator Login</p></h3>");
out.println("<p align=center> </p>");
out.println("<p align=center><strong>User Name:</strong>");
out.println("<input name=uname type=text /></p>");
out.println("<p align=center><strong>Password:  </strong>");
out.println("<input name=pass type=password />");
out.println("</p>");
out.println("<p align=center>");

out.println("                ");

out.println(" <input type=submit name=Submit value=Submit />");
out.println("<input name=Cancel type=reset id=Cancel value=Cancel />");
out.println("</p>");
out.println("</form><br><br><h3>");
out.println("<p align=center>");
out.println("<a href=http://localhost:8084/servlet/signup>Sign up</a>");
out.println("</p></h3>");
out.println("</body>");
out.println("</html>");

out.close();
}

// <editor-fold defaultstate="collapsed" desc="HttpServlet methods. Click on the + sign on the left to edit the code.">
/** Handles the HTTP <code>GET</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doGet(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

/** Handles the HTTP <code>POST</code> method.
* @param request servlet request
* @param response servlet response
*/
protected void doPost(HttpServletRequest request, HttpServletResponse response)
throws ServletException, IOException {
processRequest(request, response);
}

/** Returns a short description of the servlet.
*/
public String getServletInfo() {
return "Short description";
}
// </editor-fold>
}

nico_swd

Apr 24th 2007, 5:37 am

Java is not JavaScript.

computerzworld

Apr 24th 2007, 5:48 am

that i know but this is the servlet prg and i want to insert javascript in it.

ajsa52

Apr 24th 2007, 8:42 am

Maybe is because there is a misspell here:

out.println("}");
out.print("</script>");
out.println("<title>Servlet login</title>");

It should be:

out.println("}");
out.println("</script>");
out.println("<title>Servlet login</title>");

computerzworld

Apr 24th 2007, 10:29 am

i have tried this one but it didn't work............
now what should i do?

ajsa52

Apr 24th 2007, 10:37 am

When you said "...But it is not validating my form...",
is it failing on val() function on client side, or on servlet/signup server side ?

And what kind of error are you getting ?

computerzworld

Apr 24th 2007, 10:56 am

it is client side scripting and it doesn't give any error but it doesn't validate my form fields and it directly goes to second page and on the second page I have put server side validation using servlet.

ajsa52

Apr 24th 2007, 11:22 am

Well, your generated javascript has multiple errors.
Mainly because it doesn't have quotes around strings. Examples:
=pink instead of ='pink'
Enter your first name instead of 'Enter your first name'
etc...

But maybe the most important is this:
replace:
<input type=submit name=Submit value=Submit/>
with
<input type='submit' name='Submit' value='Submit' onclick='return val();'/>

And your sentence:
out.println("                ");
it's really old fashioned, now it's simpler with some CSS span or div
.