Next Previous link with filter

texnixe · September 7, 2018, 4:50pm

It’s possible with these two custom methods:

texnixe/kirby-custom-methods/blob/master/page-methods/get-next.php

<?php

// get next page of a given children collection (e.g. filtered collection)
page::$methods['getNext'] = function($page, Children $siblings, $sort = array(), $visibility = false) {
  if($sort) $siblings = call(array($siblings, 'sortBy'), $sort);
  $index = $siblings->indexOf($page);
  if($index === false) return null;
  if($visibility) {
    $siblings = $siblings->offset($index+1);
    $siblings = $siblings->{$visibility}();
    return $siblings->first();
  } else {
    return $siblings->nth($index + 1);
  }
};

github.com

texnixe/kirby-custom-methods/blob/master/page-methods/get-prev.php

<?php

// get prev page of a given children collection (e.g. filtered collection)
page::$methods['getPrev'] = function($page, Children $siblings, $sort = array(), $visibility = false) {
  if($sort) $siblings = call(array($siblings, 'sortBy'), $sort);
  $index = $siblings->indexOf($page);
  if($index === false or $index === 0) return null;
  if($visibility) {
    $siblings = $siblings->limit($index);
    $siblings = $siblings->{$visibility}();
    return $siblings->last();
  } else {
    return $siblings->nth($index - 1);
  }
};

They allow you to pass the filtered collection as first argument.

<?php
$siblings = $page->siblings()->visible()->filterBy('template', '==', 'blogarticle')->unscheduled();
 if($previous = $page->getPrev($siblings)): ?>
    <a href="<?= $previous->url() ?>">previous articles</a>
<?php endif ?>

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