Validation : JavaScript Servlets « Servlets « Java

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Java » Servlets » JavaScript Servlets 




Validation


/* validate.js

<script language="JavaScript"> 
function validate(form1)
{

    for (i = 0; i < form1.length; i++){

       if( (form1.elements[i].value == "")  ){
           alert("You must provide a value for the field named: " + form1.elements[i].name)
           return false
           }
    
  }
  return true

}
</script>


*/

import javax.servlet.RequestDispatcher;
import javax.servlet.ServletException;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;

public class FormServlet extends HttpServlet {

  public void doGet(HttpServletRequest request, HttpServletResponse response)
      throws ServletException, java.io.IOException {

    response.setContentType("text/html");
    java.io.PrintWriter out = response.getWriter();
    out.println("<html><head>");

    RequestDispatcher dispatcher = request
        .getRequestDispatcher("/WEB-INF/validate.js");

    dispatcher.include(request, response);

    out.println("<title>Help Page</title></head><body>");
    out.println("<h2>Please submit your information</h2>");

    out.println("<form action =\"" + request.getContextPath()
        "/displayHeaders.jsp\" onSubmit=\" return validate(this)\">");

    out.println("<table border=\"0\"><tr><td valign=\"top\">");
    out.println("Your name: </td>  <td valign=\"top\">");
    out.println("<input type=\"text\" name=\"username\" size=\"20\">");
    out.println("</td></tr><tr><td valign=\"top\">");
    out.println("Your email: </td>  <td valign=\"top\">");
    out.println("<input type=\"text\" name=\"email\" size=\"20\">");
    out.println("</td></tr><tr><td valign=\"top\">");

    out.println("<input type=\"submit\" value=\"Submit Info\"></td></tr>");
    out.println("</table></form>");
    out.println("</body></html>");
    out.close();
  }
}
           
       














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