Check box selection

Question

Hi
I have a problem with check box selection.I query from the database and based on the output from the query i prepopulate the check box with a tick mark.But when the user goes again and deselects one of the check box that was ticked and submits the form , it also includes the unchecked box.the following is the code I have.
<%
if (itemStr == 00 ){
%>
<td align="center">
<input type="checkbox" name="build">
</td>
<% }
else{ %>
<td align="center">
<input type="checkbox" name="build1" checked >
</td>
Then in my form I do
String[] ar = request.getParameterValues("build1");
how do i ensure if the user unselects from build1 , it doesnt add that item.
Help Needed
Arn

Answer 1

Notice that this line
request.getParameterValues("build1");
is getting the value of the check box. The "checked" attribute is not the value, just the attribute.
Oddly enough, I just wrote some code to do this today.
First, add this little javascript method to your page.
<SCRIPT language="JavaScript"> <!--  //Hide contents from older browsers
function setHiddenTagFromCheckbox(checkbox, element) {
  if(checkbox.checked) {
    element.value="yes";  
  else {
    element.value="no";  
// End hiding the contents -->
</SCRIPT> 2) Add a hidden input field for each checkbox field.
<input type="HIDDEN" name="prin2signhidden" value = "no">3) Add an onclick handler for the check box
<input type=checkbox name="prin2sign" onclick="setHiddenTagFromCheckbox(document.formname.prin2sign, document.formname.prin2signhidden)">In your servlet check the value of prin2signhidden instead of the checkbox input.
The forum is doing odd things to this source code. Any place you see a > you should actually have a "greater than" sign.