Something like this, only a more advanced form fields module might be better if you're doing a professional app rather than a quick hack, and you'd want to put your site design in a template file rather than just hard-coding it here.
#!/usr/bin/perl
use CGI qw(:standard);
use strict;
use warnings;
my (@errors, %data, %forms);
### Validate fields
if (param('submitted')) {
$data{$_} = param($_) for param();
### Do whatever convertions on %data
push @errors, 'My field is required.'
if !$data{'myfield'};
}
### Process form data somehow
if (param('submitted') && $#errors == -1) {
### Do something, like submit to database or display result
### Forward to another page, or display form again by just
### letting it run through to the bottom
}
### Generate form fields, filling in previous values
$forms{'myfield'} = textfield(-name => 'myfield', -value => $data{'myf
+ield'}, -size => 10, -maxlength => 50);
print qq|
<html>
<head>
<title>Page Title</title>
</head>
<body bgcolor="#FFFFFF">
<b>Page Title</b><p>
|;
if ($#errors != -1) {
print '<font color="#CC0000"><b>';
print join "<br>\n", @errors;
print '</b></font><p>';
}
print qq|
<form method="post" action="$ENV{'REQUEST_URI'}">
<input type="hidden" name="submitted" value="1">
$forms{'myfield'}
<input type="submit" value="Submit">
</form>
</body>
</html>
|;
| 