Word limit for ACF text input field

admin.js

// This is a function to limit word count on ACF fields
// Add cu-helper__max-words-3 to the field class for a limit of 3 words
var maxWordHelperClass = 'cu-helper__max-words-';
$('#editor').on('keydown', '.acf-field[class*="' + maxWordHelperClass + '"] input', function (e) {

  var maxWords = 0;
  var $input = $(this);
  if ($input.attr('data-max-words')) {

    var maxWords = $input.attr('data-max-words');

  } else {

    var $field = $input.closest('.acf-field')
    var classList = $field.attr('class').split(/\s+/);
    $.each(classList, function (index, item) {
      if (item.indexOf(maxWordHelperClass) >= 0) {
        console.log(item);
        var parts = item.split("-");
        var maxWords = parts.pop();
        $input.attr('data-max-words', maxWords);
      }
    });

  }

  // Split the text in the input and get the current number of words
  var words = $input.val().split(/\s+/).length
  // If the word count is > than the max amount and a space is pressed
  // Don't allow for the space to be inserted
  if (!$input.attr('data-announce')) {
    // If the first two tests fail allow the key to be inserted
    // Otherwise we prevent the default from happening
    words >= maxWords && e.keyCode == 32 && e.preventDefault()
  } else {
    words >= maxWords && e.keyCode == 32 && (e.preventDefault() || alert('Word Limit Reached'))
  }
});