How to make next/prev links for entries circular/endless

Question

I've got a basic portfolio website which has "prev project" and "next project" buttons on each entry detail page. I'd like for when you reach the last project for the "next project" button to simply link back to the first instead of simply not appearing at all.

Any idea how this could be done? Thanks so much in advance.

 {% if nextEntry %}<a href="{{ nextEntry.url }}">Prev Project</a>{% endif %}
 {% if prevEntry %}<a href="{{ prevEntry.url }}">Next Project</a>{% endif %}

Answer 1

I'm going to assume your project section is named projects, if it's not, replace it with you section name.

Try this:

{% if nextEntry %}
    {% set nextEntryUrl = nextEntry.url %}
{% else %}
    {% set firstEntry = craft.entries.section('projects').first() %}
    {% set nextEntryUrl = firstEntry.url %}
{% endif %}

{% if prevEntry %}
    {% set prevEntryUrl = prevEntry.url %}
{% else %}
    {% set lastEntry = craft.entries.section('projects').last() %}
    {% set prevEntryUrl = lastEntry.url %}
{% endif %}

<a href="{{ prevEntryUrl }}">Prev Project</a>
<a href="{{ nextEntryUrl }}">Next Project</a>

Answer 2

Could you do something like (untested)

{% set nextUrl = nextEntry is defined and nextEntry ? nextEntry.url : url('portfolio/root') %}
<a href="{{ nextUrl }}">Next page</a>

Or, for probably better usability

 {% if nextEntry %}
  <a href="{{ nextEntry.url }}">Next Project</a>
 {% else %}
   <a href="{{ url('portfolio/root') }}">back to start</a>
 {% endif %}