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Modify Previous Next functionality to list the parent's next and previous pages

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Hello,

Like the title says I would like to modify the previous next blocks functionality to list the parents next and previous pages.

I'm creating a website for a local business at the moment and they have a past projects section of their website.

So for example:
Past Projects -> Past Projects 2014 -> (Project)

At the moment I managed to add my own template for the previous next block which looks like this:
<?php
defined('C5_EXECUTE') or die("Access Denied.");
$nh = Loader::helper('navigation');
$previousLinkURL = is_object($previousCollection) ? $nh->getLinkToCollection($previousCollection) : '';
$nextLinkURL = is_object($nextCollection) ? $nh->getLinkToCollection($nextCollection) : '';
?>
<ul class="nav">
  <?php
  if ($nextLinkURL) {
    echo "<li class>";
    echo $nextLinkURL ? '<a href="' . $nextLinkURL . '">Next Project</a>' : '';
    echo "</li>";
  }else{
    echo "<li class='inactive'><a>Next Project</a></li>";
  }
Viewing 15 lines of 24 lines. View entire code block.


This works really well and I'm quite pleased with it however I need to add a similar template to the right of the website so I created another template:
<?php
defined('C5_EXECUTE') or die("Access Denied.");
$nh = Loader::helper('navigation');
$previousLinkURL = is_object($previousCollection) ? $nh->getLinkToCollection($previousCollection) : '';
$parentLinkURL = is_object($parentCollection) ? $nh->getLinkToCollection($parentCollection) : '';
$nextLinkURL = is_object($nextCollection) ? $nh->getLinkToCollection($nextCollection) : '';
?>
<ul class="nav">
  <?php
  if ($parentLinkURL) {
    echo "<li class>";
    echo $parentLinkURL ? '<a href="' . $parentLinkURL . '">' . $parentLinkText .  '</a>' : '';
    echo "</li>";
  }
  ?>
Viewing 15 lines of 16 lines. View entire code block.


I would like this template to get the parent page's next and previous (2014, 2013) so I can put it as previous and next years.

Next Year
2014
Previous Year

I would also like it to link to the actual page for previous and next year (Past Projects 2013)

Any help is much appreciated.
hdocwra