Disabling submit buttons on click is pretty common nowadays I think, adding the following to the Free Nodelet Settings enables this behavior for the "preview" and "create" buttons (using jQuery). Because disabled buttons don't get included in form submissions, but PerlMonks relies on them, I added a workaround which adds a <input type="hidden" ...>.

<script src="https://code.jquery.com/jquery-3.2.1.min.js"
  integrity="sha256-hwg4gsxgFZhOsEEamdOYGBf13FyQuiTwlAQgxVSNgt4="
  crossorigin="anonymous"></script>
<script language="javascript" type="text/javascript">
//<!--
$(document).ready(function() {
  $("input[type='submit'][name='op'][value='preview'], "
   +"input[type='submit'][name='op'][value='create']")
      .click(function() {
        $(this).prop("disabled",true);
        $(this).after( $('<input>').attr({
          type: 'hidden',
          name: $(this).attr('name'),
          value: $(this).attr('value') }) );
      });
});
//-->
</script>

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In reply to [Free Nodelet Hack] Disable Submit Button on Click by haukex

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