The most likely culprit if your problem is the end_form function as demonstrated below.

I created the following cgi script to test your issue

#!/usr/bin/perl -wT

use CGI;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

use strict;
use warnings;

my $q = CGI->new;

print $q->header();
print <<"END_HTML";
<html>
<body>
<form method="post">
END_HTML

foreach my $f (qw(foo bar baz)) {
    print "<p>$f</p>\n";
    print $q->radio_group(
        -name    => $f,
        -values  => [qw(c r t s)],
        -default => '-',
    ) . "\n";
}

print $q->submit(-name => 'submit', -value => 'save') . "\n";

print <<"END_HTML";
</form>
</body>
</html>
END_HTML

1;

__END__

[download]

This appears to work as you desire. You can hit submit multiple times, and it will only autofill the radio buttons that were previously selected by the user.

However, if I replace my hardcoded form tags with the cgi functions start_form and end_form, then your problem appears.

#!/usr/bin/perl -wT

use CGI;
use CGI::Carp qw(fatalsToBrowser warningsToBrowser);

use strict;
use warnings;

my $q = CGI->new;

print $q->header();
print <<"END_HTML";
<html>
<body>
END_HTML

print $q->start_form() . "\n"; # <------ Changed code

foreach my $f (qw(foo bar baz)) {
    print "<p>$f</p>\n";
    print $q->radio_group(
        -name    => $f,
        -values  => [qw(c r t s)],
        -default => '-',
    ) . "\n";
}

print $q->submit(-name => 'submit', -value => 'save') . "\n";

print $q->end_form() . "\n"; # <------ Changed code

print <<"END_HTML";
</body>
</html>
END_HTML

1;

__END__

[download]

I therefore suggest that you start your investigation there. At the very least you can hardcode your form tags and avoid the problem, but it appears the end_form function adds the following text that for some reason creates your issue.

<div><input type="hidden" name=".cgifields" value="bar"  /><input type
+="hidden"
name=".cgifields" value="baz"  /><input type="hidden" name=".cgifields
+" value="f
oo"  /></div>

[download]
- Miller

In reply to Re: How to get unselected radio_group() items after submitting form by wind
in thread How to get unselected radio_group() items after submitting form by slugger415

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