While you're at it you might reconsider giant if/else trees, even though a lot of people, even smart poeple, like/use them

I find this to read, easier to maintain

#!/usr/bin/perl --
use strict; use warnings;
use CGI::FormBuilder;

Main( @ARGV );
exit( 0 );

sub Main {
    
    my $cgi = CGI->new;

    # Our "mode" parameter determines what we do
    my $mode = $cgi->param('mode') || 'default';

    # Change our form based on our mode
    if ($mode eq 'view') {
        modeView( $cgi );
    } elsif ($mode eq 'edit') {
        modeEdit( $cgi );
    } else {
        modeDefault( $cgi );
    }
}

sub modeDefault { ... }
sub modeEdit { ... }
sub modeView {
    my ( $cgi ) = @_;
    my $form = CGI::FormBuilder->new(
        method => 'post',
        fields => [qw(...)],
        params => $cgi      # get CGI params
    );
    ...
    if ($form->submitted && $form->validate) {
        print $form->confirm;
    } else {
        print $form->render;
    }
}
[download]

But if you go that approach, you might as well use a little standard sugar

#!/usr/bin/perl --
use strict; use warnings;
use CGI::Application;
use CGI::FormBuilder;

Main( @ARGV );
exit( 0 );

sub Main {
    MyAppname->new->run;
}
BEGIN {
    package MyAppname;
    use parent 'CGI::Application';
    use CGI::Application::Plugin::AutoRunmode;
    use CGI::Application::Plugin::DebugScreen;
    
    sub What : Runmode {
        CGI::FormBuilder->new->render;
    }
    sub Edit : Runmode {
        ...
    }
    
    sub View: StartRunmode {
        my ( $cgiapp ) = @_;
        my $form = CGI::FormBuilder->new(
            method => 'post',
            fields => [qw( one two three )],
            params => $cgiapp->query, # get CGI params
        );
        
        
        if ($form->submitted && $form->validate) {
# you don't print in CGI::Application
            return $form->confirm;
        } else {
            return $form->render;
        }
    }
}
[download]

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