Submitting Form Var Problem

[Ralph Freshour]

I have two dropdown list:

frm_cbo_top

frm_cbo_bottom


I have an OnChange="submit_form();" in each of these dropdown lists -
the javascript does a form.submit() call

The problem is that the post .php file which gets called *always*
catches this line:

if ($frm_cbo_top)
{
// do some work
}

Even when I make a selection in the bottom dropdown object the
$frm_cbo_top var if statement is active because the code flow goes
into the section - I want the $frm_cbo_bottom to catch is I select
that dropdown and the $frm_cbo_bottom to catch if I select that
dropdown - what am I missing here?

Thanks...

[jn]

"Ralph Freshour" <ralph@primemail.com> wrote in message
news:usa2qvoupoers1gelqidfj8dutgt6ifmml@4ax.com...

> I have two dropdown list:
>
> frm_cbo_top
>
> frm_cbo_bottom
>
>
> I have an OnChange="submit_form();" in each of these dropdown lists -
> the javascript does a form.submit() call
>
> The problem is that the post .php file which gets called *always*
> catches this line:
>
> if ($frm_cbo_top)
> {
> // do some work
> }
>
> Even when I make a selection in the bottom dropdown object the
> $frm_cbo_top var if statement is active because the code flow goes
> into the section - I want the $frm_cbo_bottom to catch is I select
> that dropdown and the $frm_cbo_bottom to catch if I select that
> dropdown - what am I missing here?
>
> Thanks...
>

frm_cbo_top is being submitted in the form with the value currently
selected, even if you use the bottom select box.

Give frm_cbo_top an empty default selected value:

<OPTION VALUE="" SELECTED>Select a value</OPTION>

and test for that in PHP:

if($frm_cbo_top != '')

HTH