Thank you, probably i needed assertion like yours from someone way more experienced than me.
So - from your classic app stack experience - is having frontend posting to itself, reloading page and act accordingly on postdata, an OK approach? Something like

print $q -> header();
if ($q -> param) {
   # we do have something to process, lets move on
   do_process($q -> param); 
} else {
   # this is clean entry, just display options
   show_page_with_form($q);
}
# despite of previous step's outcome, show footer with copylefts and e
+nd document gracefully
show_footer($q);
print $q -> end_html;
1
[download]

Yes, that's fine. Combining a form plus its handler in one script/URL is not atypical and it gives an easy way for you redisplay the form in the handler if the user's inputs are in some way invalid.

One more thing I would recommend is to look at a templating system. This is another thing that you might consider overkill just now but will pay off handsomely in the long run. I tend to use Template and other folks swear by HTML::Template and there are a host more to choose from too. The point is to separate the rendering of the output from the logic of the application and to allow for easy re-use of that output in terms of common page layout, error handling, etc.

Good luck with your project!

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🦛