Thomas To wrote:
>
> Thanks for all the help.
>
> My situation is slightly different. Following is part of the html code:
>
> <td><input type="checkbox" name="OtherInterest" value="Traveling">
> Traveling</td>
> <td><input type="checkbox" name="OtherInterest" value="Fishing">
> Fishing</td>
>
> Name "OtherInterest" is not known to the servlet. I can't hard coded it
> in the servlet. That's why it causes problems when user doesn't check
> either Fishing or Traveling because the parameter name "OtherInterest"
> will not be return by getParameterNames() at all.
>
> The reason I need to put "Traveling" and "Fishing" as the values rather
> then "true" is because I need the actual string. So if user click on
> "Traveling", the string "Traveling" will be return. If both were
> checked, the return string will be "Traveling,Fishing" by calling
> req.getParameter(); I need the actual strings "Traveling" and "Fishing"
> to update the database.
I'm not sure if this will help you, but it might.
You can add a hidden field with the same name as the checkbox fields and
an empty string as its value. This way you will always get a parameter
with this name, even if none of the checkboxes is checked.
In you servlets you could do something like this:
Hashtable parsedParams = new Hashtable();
String[] names = req.getParameterNames();
for (int i = 0; i < names.length; i++) {
String param = names[i];
String[] values = req.getParameterValues(param);
Vector parsedValues = new Vector();
for (int j = 0; j < values.length; j++) {
String value = values[i];
// Get rid of empty strings
if (value.length() != 0) {
parsedValues.addElement(value);
}
}
parsedParams.put(param, parsedValues);
}
Enumeration validParams = parsedParams.keys();
while (validParams.hasMoreElements) {
Vector validValues = (Vector) validParams.nextElement();
if (validValues.size() == 0) {
// Process empty text field or empty checkbox value
}
if (validValues.size() == 1) {
// Process filled out text field or single-value checkbox value
}
if (validValues.size() > 1) {
// Process multi-value checkbox value
}
}
If you need a way to distinguish between empty/single-value text fields
and empty/single-valued checkboxes you can use some naming convention
for the field names.
I hope this helps you solve the problem.
--
Hans Bergsten [EMAIL PROTECTED]
Gefion Software http://www.gefionsoftware.com
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