Fixes 11ty/eleventy#819

docs/filters/collection-items.md

@@ -0,0 +1,44 @@
+---
+eleventyNavigation:
+  parent: Filters
+  key: Next or Previous Collection Item Filters
+  order: 4
+  excerpt: 'Get next or previous collection items for easy linking.'
+---
+# `getNextCollectionItem` and `getPreviousCollectionItem` Universal Filters
+
+{% addedin "0.11.0" %} Fetch the previous and next items in a collection when you pass in the current `page` object.
+
+{% codetitle "Nunjucks", "Syntax" %}
+
+{% raw %}
+```
+{{ set previousPost = collections.posts | getPreviousCollectionItem(page) }}
+{{ set nextPost = collections.posts | getNextCollectionItem(page) }}
+```
+{% endraw %}
+
+{% codetitle "Liquid", "Syntax" %}
+
+{% raw %}
+```
+{% assign previousPost = collections.posts | getPreviousCollectionItem: page %}
+{% assign nextPost = collections.posts | getNextCollectionItem: page %}
+```
+{% endraw %}
+
+Useful when you’d like to link to the previous or next template in your collection:
+
+{% raw %}
+```
+{% if previousPost %}Previous Blog Post: <a href="{{ previousPost.url }}">{{ previousPost.data.title }}</a>{% endif %}
+```
+{% endraw %}
+
+{% raw %}
+```
+{% if nextPost %}Next Blog Post: <a href="{{ nextPost.url }}">{{ nextPost.data.title }}</a>{% endif %}
+```
+{% endraw %}
+
+* [← Back to Filters documentation.](/docs/filters/)