{% assign links = site[page.collection] | sort: 'order' | map: 'url' %}
{% for link in links %}
  {% if link == page.url %}
    {% if forloop.first %}
      {% assign prevlink = links | last %}
      {% assign nextlink = links[forloop.index] %}
    {% elsif forloop.last %}
      {% assign prevlink = prev %}
      {% assign nextlink = links | first %}
    {% else %}
      {% assign prevlink = prev %}
      {% assign nextlink = links[forloop.index] %}
    {% endif %}
  {% endif %}
  {% assign prev = link %}
{% endfor %}

{% if prevlink and nextlink %}
  <script type='text/javascript'>
    $('#prevlink').append(`<a href='{{ prevlink | absolute_url }}' display='none'>&#8249;</a>`);
    $('#nextlink').append(`<a href='{{ nextlink | absolute_url }}' display='none'>&#8250;</a>`);
  </script>
{% endif %}