Thanks for your reply. Still need more help.
Actually this a checkbox issue. I my case i believe
your suggestions couldn�t help me
(req.getParameterNames(). Also assign default value)
Let�s explain more:
On client: I have a JSP page like spread sheet(grid).
some of the columns may be checkboxs. As you know
checkbox will not pass a value to webserver when is
un-checked. If any column changed, it�s name will
concatenated by 1. (field.name= �1�+field.name).
On server: The servlet will only request for
changed-columns and update database.
request.getParameter(�1�+col_name);
This logic works good for all other tags except
checkboxs. Because cannot realize the
1- checkbox is never changed.
2- checkbox is changed to un-check.
Servlet must ignore the first case but update the
database for the second case.
Thanks...Ali
--- Mark Galbreath <[EMAIL PROTECTED]> wrote:
> Or assign the parameter a default value.
>
> Mark
>
> -----Original Message-----
> From: Jeremy W. Redmond
> Sent: Friday, December 14, 2001 12:31 PM
>
> see if it is in the enumeration
> req.getParameterNames().
>
> -----Original Message-----
>
> value=request.getParameter("param_name");
>
> The above statement in called page will return null
> in
> two cases:
>
> 1-when the "param_name" is passed with no value
> 2-when the "param_name" didn't pass at all.
>
> How can I differentiate these two. I mean I need to
> somehow know whether
> Parameter did not pass or passed with no value.
>
>
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