I have a script which uses HTML::Template to throw different pages depending on the information received:

           # open the HTML template
    my $template = HTML::Template->new(filename => $f_name);

    # fill in some parameters in the template
        $template->param(Number => $Number);
    $template->param(new => $new);
    $template->param(story => $story);
    $template->param(id_no => $id_no);
    $template->param(message_no => $message_no);
    if (($check == '0') or ($check == '3') or ($check == '4')) {
    $template->param(tart => $tart);
    $template->param(ear => $ear);
    $template->param(mouth => $mouth);
 }

    # print the template to file
    print $template->output;

[download]

My problem is that one of the pages does not need/contain the HTML line : <TMPL_VAR NAME="mouth">
The result is that when the template is called for that page a blank screen results

My workaround is simply to put that line into the template as a comment, and that works fine, but I thought I'd ask the question to see if there is a way of preventing the problem instead of stuffing the templates full of superfluous comments.

Thank you

PS I tried the following to no avail: 

    if (($check == '0') or ($check == '3') or ($check == '4')) {
    $template->param(tart => $tart);
    $template->param(ear => $ear);
 }
    if (($check == '0') or ($check == '4')) {
    $template->param(mouth => $mouth);
 }

[download]

In reply to Unused variable in HTML::Template results in blank screen by jonnyfolk

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.