Add a tally counter

For this to work, you will need a numeric field with the data name tally_count and a hyperlink field with the data name of increment.

ON('click', 'increment', function(event) {
  // increment the numeric field by 1
  SETVALUE('tally_count', ($tally_count || 0) + 1);
});

Another approach to a tally counter uses a numeric field with the data name tally_count and a Default Value of 0. Also used is a Yes/No field with the data name of tally with these substitutions below:

664 — Tally example Yes/No field settings

ON('change', 'tally', function (event) {
  if ($tally == 'add') {
    SETVALUE('tally_count', $tally_count + 1);
    SETVALUE('tally', null);
  }
  if ($tally == 'subtract') {
    SETVALUE('tally_count', $tally_count - 1);
    SETVALUE('tally', null);
  }
});