The generic answer is that there are at least two ways to do what you're attempting. One is to use JavaScript to check that all fields that you require are filled in and not let the page proceed until that requirement is met.

The purely Perl option is to use self referencing CGI, similar to what olus said to do your parsing and not let the script move on until your conditions are met. 

$|++;

use strict;
use CGI;
my $query = CGI->new();

print $query->header;

if ( !$query->param() ) {
  # no parameters so display your login page
    my_login_form();
}
else {
  #since you've got parameters, make sure all that you require are fil
+led in and process accordingly.

[download]

If your not getting all the fields filled in you want, you just redisplay the login form. If you do get all your fields filled in and verified, then you can proceed.

HTH!

Revolution. Today, 3 O'Clock. Meet behind the monkey bars.

I would love to change the world, but they won't give me the source code

In reply to Re: How do I make a form field required for a Perl Chat Script? by Popcorn Dave
in thread How do I make a form field required for a Perl Chat Script? by SolitudeDude

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.