Validation for saving values in jsp--is validation compulsory?

Hi all,
in my application there is a jsp which uses a pagebean.
now i added somemore attributes to the pagebean and included them in the jsp as well.
there is javascript validation for the previous attributes.
the values can be modified and should be saved to the db2 database on cliking the modify botton.
my question is do i need to include java script validation for the new attributes that i added to the pagebean and jsp to get modified and stored to the database?
or can i modify and save the new values without validation?
is validation compulsory?
your reply is very imp to me friends
cheers and thanks in advance

well, validation in general isn't required, but if some bad value is entered and not otherwise checked for, you could get errors.
and if you use validation at all, then the server-side validation will always run even if the JS validation runs or not.

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out.println("<TR BGCOLOR='black'>");
out.println("<TD WIDTH='12%' ALIGN='center'><INPUT NAME='cmdDelete' TYPE='button' VALUE='Delete' onClick='setDelMode();'></TD>");
out.println("<TD><FONT COLOR='#FFFFFF'>Group Name</FONT></TD>");
out.println("<TD><FONT COLOR='#FFFFFF'>Group Type</FONT></TD>");
out.println("<TD><FONT COLOR='#FFFFFF'>Group Detail</FONT></TD>");
out.println("</TR>");
if (rs != null) {
while (rs.next()) {
out.println("<TR>");
out.println("<TD><INPUT TYPE='checkbox' NAME='chk" + rs.getString("student_id") + "' VALUE='" + rs.getString("student_id") + "'></TD>");
out.println("<TD STYLE=\"cursor:pointer\" onMouseDown=\"setEditMode('" + rs.getString("student_id") + "', '" + rs.getString("username") + "', '" + rs.getString("std_Fname") + "', '" + rs.getString("std_Lname") + "');\">" + rs.getString("username") + "</TD>");
out.println("<TD STYLE=\"cursor:pointer\" onMouseDown=\"setEditMode('" + rs.getString("student_id") + "', '" + rs.getString("username") + "', '" + rs.getString("std_Fname") + "', '" + rs.getString("std_Lname") + "');\">" + rs.getString("std_Fname") + "</TD>");
out.println("<TD STYLE=\"cursor:pointer\" onMouseDown=\"setEditMode('" + rs.getString("student_id") + "', '" + rs.getString("username") + "', '" + rs.getString("std_Fname") + "', '" + rs.getString("std_Lname") + "');\">" + rs.getString("std_Lname") + "</TD>");
%>
<% // out.println("<TD STYLE=\"cursor:pointer\" onMouseDown=\"setEditMode('" + rs.getString("group_id") + "', '" + rs.getString("group_name") + "', '" + rs.getString("group_type") + "', '" + rs.getString("group_details") + "') + "');\">" + rs.getString("PublisherName") + "</TD>");
out.println("</TR>");
out.println("</TABLE>");
} catch (Exception e) {
out.println("Sorry Failed to execute the query. " + e.getMessage());
%>
</tr>
</table>
<a href="cr_grp.jsp">back</a>
<table>
<%! String srch_name1 = "";%><% srch_name1 = request.getParameter("search_stu");%>
<tr><td><input type="text" id="search_stu" name="search_stu" value="<%=srch_name1%>" size="42" /></td>
<td> <input type="submit" id="cmSearchStu_group" name="cmSearchStu_group" value="Search Student" />
</td></tr>
</table>
<input type="hidden" id="search_stu_store" name="search_stu_store" value="<%=request.getParameter("ID")%>" size="42" />
<input type="hidden" id="search_stu_store_name" name="search_stu_store_name" value="<%=request.getParameter("param1")%>" size="42" />
<%! String vl_data;
String student_Nm1;
String group_ID_from_student;
PreparedStatement ps;
%>
<%
//Pass Id and Group name
////////end pass value////////
if (request.getParameter("cmSearchStu_group") != null) {
String scondPass = request.getParameter("search_stu_store");
String scondPassName = request.getParameter("search_stu_store_name");
String srch_name = request.getParameter("search_stu");
out.println(srch_name);
stmt = con.createStatement();
try {
//student where groups LIKE '%" + data1 + "%'";
String search_stud = "select username,student_id,groups from student where std_Lname LIKE '%" + srch_name + "%' or std_Mname LIKE '%" + srch_name + "%' or username LIKE '%" + srch_name + "%' or std_Fname LIKE '%" + srch_name + "%' or city_c LIKE '%" + srch_name + "%' or state_c LIKE '%" + srch_name + "%' or pincode_c LIKE '%" + srch_name + "%' or city_p LIKE '%" + srch_name + "%'or state_p LIKE '%" + srch_name + "%' or pincode_p LIKE '%" + srch_name + "%' or std_DOB LIKE '%" + srch_name + "%' or std_gender LIKE '%" + srch_name + "%' or std_bloodGroup LIKE '%" + srch_name + "%' or std_addmission_no LIKE '%" + srch_name + "%' or std_transport LIKE '%" + srch_name + "%' or std_medicalNotes LIKE '%" + srch_name + "%' or std_home_no LIKE '%" + srch_name + "%' or std_emergency_no LIKE '%" + srch_name + "%' or std_email LIKE '%" + srch_name + "%' or std_parentemail LIKE '%" + srch_name + "%' or std_nationality LIKE '%" + srch_name + "%' or student_id LIKE '%" + srch_name + "%' or groups LIKE '%" + srch_name + "%' ";
rs = stmt.executeQuery(search_stud);
if (rs != null) {
while (rs.next()) {
String std_id1 = rs.getString("student_id");
student_Nm1 = rs.getString("username");
group_ID_from_student = rs.getString("groups");
// response.sendRedirect("search_grp_try.jsp?ID1="+scondPass+"&parameter1="+scondPassName+"#srch_grp_stud ");
%>
<input type="checkbox" name="<%=std_id1%>" value="<%=std_id1%>"/>
<INPUT MAXLENGTH="255" NAME="txtstud_name" TYPE="text" VALUE="<%=student_Nm1%>" >
<% String chkBxVal = request.getParameter(std_id1);
out.println(chkBxVal);
out.println(id_passes);
out.println(std_id1);
// out.println(m);
if ((chkBxVal != null)) {
try {
query2 = "update student set groups = " + scondPass + " WHERE student_id='" + std_id1 + "'";
ps = con.prepareStatement(query2);
ps.executeUpdate();
String sendTo = "search_group.jsp?id='" + request.getParameter("ID") + "' ";
response.sendRedirect(sendTo);
} catch (Exception e) {
out.println(e.getMessage());
} catch (Exception e) {
out.println(e.getMessage());
} finally {
rs.close();
stmt.close();
// con.close();
%>
<% if (request.getParameter("Add_student") != null) {
String scondPass = request.getParameter("search_stu_store");
String scondPassName = request.getParameter("search_stu_store_name");
%>
<input type="hidden" id="search_stu_str_name" name="search_stu_str_name" value="<%=request.getParameter("param1")%>" size="42" />
<%String srch_name = request.getParameter("search_stu");
String valueGetd = request.getParameter("search_stu_str_name");
stmt = con.createStatement();
try {
String search_stud = "select username,student_id,groups from student where std_Lname = '" + srch_name + "' or std_Mname ='" + srch_name + "' or username='" + srch_name + "' or std_Fname='" + srch_name + "' or city_c='" + srch_name + "' or state_c='" + srch_name + "' or pincode_c='" + srch_name + "' or city_p='" + srch_name + "'or state_p='" + srch_name + "' or pincode_p='" + srch_name + "' or std_DOB='" + srch_name + "' or std_gender='" + srch_name + "' or std_bloodGroup='" + srch_name + "' or std_addmission_no='" + srch_name + "' or std_transport='" + srch_name + "' or std_medicalNotes='" + srch_name + "' or std_home_no='" + srch_name + "' or std_emergency_no='" + srch_name + "' or std_email='" + srch_name + "' or std_parentemail='" + srch_name + "' or std_nationality='" + srch_name + "' or student_id='" + srch_name + "' or groups='" + srch_name + "' ";
rs = stmt.executeQuery(search_stud);
if (rs != null) {
while (rs.next()) {
String std_id1 = rs.getString("student_id");
student_Nm1 = rs.getString("username");
group_ID_from_student = rs.getString("groups");
// response.sendRedirect("search_grp_try.jsp?ID1="+scondPass+"&parameter1="+scondPassName+"#srch_grp_stud ");
%>
<input type="checkbox" name="<%=std_id1%>" value="<%=std_id1%>"/>
<INPUT MAXLENGTH="255" NAME="txtstud_name" TYPE="text" VALUE="<%=student_Nm1%>" >
<% String chkBxVal = request.getParameter(std_id1);
String symbl = " ; ";
/* if((group_ID_from_student).equals(null)){
group_ID_from_student="";
else{
*/ String merge_grp = group_ID_from_student + symbl;
String final_merge = merge_grp + datamt1;
if ((chkBxVal != null)) {
try {
query2 = "update student set groups = '" + final_merge + "' WHERE student_id='" + std_id1 + "'";
ps = con.prepareStatement(query2);
ps.executeUpdate();
} catch (Exception e) {
out.println(e.getMessage());
} catch (Exception e) {
out.println(e.getMessage());
} finally {
rs.close();
stmt.close();
con.close();
// response.sendRedirect("search_grp_try.jsp?ID1=" + id_passes + "&parameter1=" + scondPassName + "#srch_grp_stud ");
%>
<input type="submit" id="Add_student" name="Add_student" value="Add" />
<table style="width:100%; height:100px; " align="center" >
<td >
<%@ include file="../pagefooter.jspf" %>
</td>
</table>
<input type="text" value="<%=request.getParameter("ID")%>" name="id_4_add5" />
<%String datamt4 = request.getParameter("id_4_add5");%>
<input type="text" value="" name="id_4_" />
<input type="submit" onclick="return copyField();" />
<% out.println("</FORM>");
out.println("</BODY>");
out.println("</HTML>");
%>
reply me

This is a little hard to follow and want to make sure I understand:
You can pass the value from page1 to page2. But when you submit on page2 to another page, the value is null?
My first recommendation is: Pull all HTML code out of scriptlets that is using out.println.
But to answer your question, you don't have the hidden fields in the <FORM> tag. They need to be places in the form tag in order for the form to pass the values when you submit.

Passing value to jsp page by clicking a hyperlink

I have a hyperlink in a jsp page1. The hyperlink is for another jsp page2. I have a string value in JSP page1, which I want to pass to jsp page2 when user clicks the hyperlink. Can anyone tell me what will be the suitable way to do this? Thanks.

here's the source to two very simple jsps that do what you want..
<HTML>
<HEAD>
<TITLE>
ForwardValue
</TITLE>
</HEAD>
<BODY>
<H1>
Go To GetValue.jsp
</H1>
</BODY>
</HTML>
<HTML>
<HEAD>
<TITLE>
GetValue
</TITLE>
</HEAD>
<BODY>
<H1>
<%= request.getParameter("value") %>
</H1>
</BODY>
</HTML>

Get dynamic values in Jsp fom Applet

Hi,
Mine is not a unique question, its been asked many times on the same forum but still I havent got any satisfactory answer so I am putting this again.
I have one applet, it is been loaded from jsp. Applet uses double buffering and its values are changing constantly.
Now my question arises here, In my jsp i have one button on the click of that button I am calling some other jsp passing some of jsp values in URL. I also want to pass one of the value of applet to jsp so it can pass to next jsp or to do something that next jsp automatically gets the new value.
I thought for Applet-servlet communication but my concerns are,as my applet is being refreshed continuously(around every 1 sec) and the value which i have to pass is changing every second and I dont know when user will click on the button of jsp so to pass that value of applet i have to do applet-servlet communication every second and that does not suit me as it consumes lot of time.
Can you suggest me any other solution so I can send value through jsp whenever button is clicked.
Thanks
Taral Shah

HI Senthil Babu
Thanks for your reply.
But applet is very important for my application as i am showing some graphical representation on it. So I have to use applet. Now you told that i have to make temporary files on client's macvhine. You mean to say each time I have to store that value on client's pc through File I/O.
Is that? but that is also problematic 'cause it consimes much time and my application deals in milli seconds.
Pl. guide me considering that time is much important for my application so solution should not consume much time.
Thanks again,
Taral Shah

Passing value from JSP to JApplet

Hello,
I am stuck up with a problem, can anyone please tell me how do i pass a value from a JSP page
to a JApplet,
and the parameter passed through JSP should be displaed in the JTextArea.
It would be kindful if any of you could help.
Thanks
Sanam

hello,
thanks for reply.
I know how to pass parameters from html,
I want to pass values from jsp page,
and i dono how to do it, may be we cann pass values through url connection but i dono how.
if anone knows plz help me in solving this.
i hvae posted my applet code.
import javax.swing.*;
import javax.swing.event.*;
import javax.swing.JToolBar;
import javax.swing.JButton;
import javax.swing.ImageIcon;
import javax.swing.JFrame;
import javax.swing.JTextArea;
import javax.swing.JScrollPane;
import javax.swing.JPanel;
import java.awt.*;
import java.awt.event.*;
import java.io.*;
import java.net.*;
import java.sql.*;
<applet code = "DocApplet" width = 500 height =5000>
</applet>
public class DocApplet extends JApplet
     private JPanel jp;
     private Container cp;
     private JTextArea jt;
     private JToolBar tb;
     private JScrollPane sp;
     private String annotation;
     private String url;
     private Connection con;
     private Statement stmt;
     public void init()
          jp = new JPanel();
          cp = getContentPane();
          jt = new JTextArea();
          tb = new JToolBar();
          sp = new JScrollPane(jt);
          repaint();
     public void start()
          jp.setLayout(new BorderLayout());
          jp.add(tb, BorderLayout.NORTH);
          jp.add(sp, BorderLayout.CENTER);
          jt.setBackground(Color.BLACK);
          jt.setForeground(Color.WHITE);
          setContentPane(jp);
          addButtons(tb);
          repaint();
     public void run()
          repaint();
     public void paint()
     private void addButtons(JToolBar tb)
          JButton button = null;
          button = new JButton("Save");
          button.addActionListener(new ActionListener()
               public void actionPerformed(ActionEvent e)
          tb.add(button);
}

Passing value from JSP to scriptlet

Hi
I am trying to find a way to pass a value from jsp to the scriptlets, i.e.
<c:set var="testValue" value="123" />
<%
System.out.println(testValue);
%>
the above code just demonstrates what I was trying to achieve, by passing the value from the jsp into the scriptlet.
Can someone tell me if there's an easy way to do this?
Thank you.

Note, using scriptlet code on your page is generally something to be avoided. 99% of what you should be doing on a JSP page can be done with EL/JSTL. If you can't do it with EL/JSTL then it probably belongs in a servlet/bean.
I always aim for 100% scriptlet free jsp pages.
Having said that, I can still answer your question: EL attributes are stored in the scope - page, request, session, application
${testValue} is equivalent to pageContext.findAttribute("testValue").
The <c:set> tag example doesn't specify a scope, so therefore you could get it like this:
<c:set var="testValue" value="123" />
<%
String testValue = (String)pageContext.getAttribute("testValue");
System.out.println(testValue);
%>alternatively exploit the feature of the useBean tag that creates a scriptlet variable:
<c:set var="testValue" value="123" />
<jsp:useBean id="testValue" type="java.lang.String"/>
<%
System.out.println(testValue);
%>Note that the EL variable and the Scriptlet variable are initially pointing at the same String.
But changing the string in scriptlet code will change the value it is pointing at, while leaving the EL variable untouched.
If you have a List in scope, and sharing it between EL and scriptlet variables then any changes to the list would be reflected because they both point at the same List object.
cheers,
evnafets

Pass values between jsp pages

Admin1.jsp
In this jsp page i have a drop down list with<select name=Update
From this page i move to the page Adnim2.jsp
Admin2.jsp
In this page i request for the value of selected entry in the drop down list as follows
String a=request.getParameter("Update");
From this page i move onto a servlet UpdateContribution.java
UpdateContribution.java
Here i need the value of the selected entry in drop down list ie Update
but String a=request.getParameter("Update"); does not work here and i get a Null Pointer Exception
Please help me

In Admin2.jsp, add a hidden form field and assign the selected value of drop-down to it. Now, you can obtain
the selected value of drop-down in Servlet(UpdateContribution.java) using given hidden form field.
Or,
Store the selected value of drop-down list in session. Now, you can obtain the value in servlet(UpdateContribution.java) through session

Validation for saving values in jsp--is validation compulsory?

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