#!/usr/bin/perl
# Fig. 16.3: fig16_03.pl
# Use hidden form fields to keep track of data.

use warnings;
use strict;
use CGI qw( :standard );

my $data = param( "HIDDEN" );
my $name = param( "NAME" );
my $value = param( "VALUE" );

$data .= "$name ";
$data .= "$value ";

print( header() );
print( start_html( -title => 'Using Hidden Fields' ) );

print <<Form;
<form method = "post" action = "fig16_03.pl">
<strong>Please enter the fields name: </strong>
<input type = "TEXT" name = "NAME"><br>
<strong>Please enter the fields value: </strong>
<input type = "TEXT" name = "VALUE"><br>
<input type = "HIDDEN" name = "HIDDEN" value = "$data">
<input type = "SUBMIT" value = "enter your data">
</form>
Form

my %values = split( ' ', $data );

foreach ( keys( %values ) ) {
   print( p( "$_: $values{ $_ }" ) );
}

print( end_html() );

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