clearing radio buttons

medalto has asked for the wisdom of the Perl Monks concerning the following question:

using CGI.pm I create radio buttons The fist one remains persistently highlighted. I've tried this to clear it ( ie start off with an empty form ) but it doesn't clear the button

my %vars = $q->Vars();#print Dumper %vars;
 $q->delete_all;
print $q ->start_form;
print $q->radio_group(-name=>'options', -values=>[keys %details] ,-col
+umns => 4,
-rows    => 2);
[download]

this also has a button persistently selected that doesnt clear with a 'form reset'

foreach my $s (keys %details)
{print  "<input type=\"radio\" name=\"options\" value=".$s,">".$s."  "
+; 
 }
[download]

but this doesn't

foreach my $s (@opts)
{print  "<input type=\"radio\" name=\"options\" value=".$s,">".$s."  "
+; 
 }
[download]

so going back to the original

print $q->radio_group(-name=>'options', -values=>\@opts,columns => 4,-
+rows> 2, -default=>'');
[download]

is there an explanation?

Comment on clearing radio buttons Select or Download Code

Replies are listed 'Best First'.
Re: clearing radio buttons by scorpio17 (Canon) on Jan 22, 2010 at 18:14 UTC
If you don't specify a default selection with the CHECKED attribute, the initial state is undefined - which means different browsers will do different things. Some will select the first item, others will select none, etc. For more details, read the specs	[reply]
Re: clearing radio buttons by ikegami (Patriarch) on Jan 22, 2010 at 18:34 UTC
`--override` is needed?	[reply] [d/l]
Re^2: clearing radio buttons by medalto (Novice) on Jan 23, 2010 at 11:34 UTC
it isn't browser-specific. I've tried it in opera 10.01 and FF 3.5. When the page first loads , nothing is checked, but as soon as something is checked it is impossible to clear it ,using the CGI.pm constructor. not sure of --override syntax. the variations ive tried haven't made any difference.	[reply]
Re^3: clearing radio buttons by ikegami (Patriarch) on Jan 23, 2010 at 18:01 UTC
Honestly, what you are trying to do doesn't make much sense. A radio input is intended to select one of many. Not zero, not two. I'm not saying it's not possible, just that it wouldn't surprise me if it isn't. Why don't you add an extra button name "None" or similar.	[reply]
Re: clearing radio buttons by MidLifeXis (Monsignor) on Jan 22, 2010 at 18:03 UTC
Perhaps the output from your snippets might help to find out what is going on. Have you tried to see what output is generated? It is said that "only perl can parse Perl." I don't even come close until my 3rd cup of coffee. --MidLifeXis	[reply]