Use AJAX to submit prayer acknowledgement link

prayer-acknowledgement.php

<?php
  $prayers = getContent(
      'prayer',
      'display:list',
      'before_show:__pagination__',
      'emailencode:no',
      'json',
      'nocache'
  );
?>
<?php foreach ($prayers as $prayer) { ?>
  <a href="<?= $prayer['acknowledgmenturl'] ?>" data-prayer="<?= $prayer['id'] ?>" class="acknowledgement_link">I prayed for this</a>
<?php } ?>
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js"></script>
<script src="https://unpkg.com/axios/dist/axios.min.js"></script>
<script>
    $(document).ready(function () {
        $(".acknowledgement_link").each(function (index, link) {
            var link = $(link);
            var cookie = "acknowlegement_" + link.data('prayer');
            if (cookieExists(cookie)) {
                link.addClass('disabled');
            }
        });
        $( ".acknowledgement_link" ).click(function( event ) {
            event.preventDefault();
            var link = $(this);
            link.addClass('disabled');
            cookie = "acknowlegement_" + link.data('prayer')
            if (cookieExists(cookie)) {
                return;
            }
            axios.get(link.attr('href'))
            .then(function (response) {
                $('#acknowledgment_count_' + link.data('prayer')).text(response.data.acknowledgement_count);
                document.cookie = "acknowlegement_" + link.data('prayer') + "=" + true;
            })
            .catch(function (error) {
               alert(error.response);
            });
        });
    });
    function cookieExists(cname) {
        var name = cname + "=";
        var decodedCookie = decodeURIComponent(document.cookie);
        var ca = decodedCookie.split(';');
        for(var i = 0; i <ca.length; i++) {
            var c = ca[i];
            while (c.charAt(0) == ' ') {
                c = c.substring(1);
            }
            if (c.indexOf(name) == 0) {
                return true;
            }
        }
        return false;
    }
</script>