SPUG: cgi method popup_menu

[Lorraine Johnson]

Howdy,

I've been experimenting and reading a bit and I think I know what the
problem is.  The popup_menu method (and the other form elements) don't make
assignments to the CGI query object, they just put together the html to
write out.

Once the user clicks the submit button, the browser encodes the form
results which are parsed by CGI.pm.  If I am following the method call path
correctly (new, init, parse_params, add_parameter?), the choices are added
to the parameter list with a push, not an assignment.  So, naturally, if
you have a second form element with the same name, you get the union of
both lists.

The -override attribute of the popup_menu method doesn't reset the
parameters (since it's not an assignment method).  Normally, on a
re-display of the form element, any user selection is displayed.  The
-override attribute ensures that the default is displayed, instead.  (See
Stein, "Official Guide to Programming with CGI.pm," pp 246-7.)

Hope this helps,

Lorraine
...................................
J. Lorraine Johnson
SAIC/Sea Technology
lorraine at nw.saic.com
v: (425) 482-3316
f: (425) 485-5566
http://www.nw.saic.com

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