When to Use Pagination in Eleventy

Eleventy’s Pagination feature often confuses new users, because you might think you need it if you want to put more than one thing on the same page. In this short entry, I’ll try to explain what it’s used for. Let’s assume you have a list like ["foo", "bar", "baz"] with the name allData. (Your real data might be a list like this, a collection like collections.posts, or any other list you like.)

Use pagination to create multiple pages from a single list

For example, to create pages for each item in the list, i.e. /tags/foo/, /tags/bar/, and /tags/baz/, you could create a file named tag.njk or tag.liquid (using Nunjucks or Liquid syntax, respectively):

Nunjucks---
pagination:
  data: allTags
  alias: item
  size: 1
permalink: "/tag/{{ item }}/"
layout: someLayout.njk
---

This is the page for {{ item }}.

The filename of the template can be anything you like, since the pages created will be named using the format in permalink.

Don’t use pagination to put several items on the same page

Instead, use looping constructs (defined by the template language you’re using) like Liquid or Nunjucks’s for. For example, you could create an HTML list from allTags in any Liquid or Nunjucks template like so:

Nunjucks<ul>
{%- for tag in allTags -%}
  <li><a href="/tags/{{ tag }}/">{{ tag }}</a></li>
{%- endfor -%}
</ul>

A real example

The tag pages on A Place For My Head are created using pagination (with Pug as the template language):

Pug---
pagination:
  data: collections.postTags
  size: 1
  alias: postTag
permalink: "| /tags/#{metadata.slug(postTag)}/"
dynamicPermalink: true
---

extends ../layouts/index.pug

include ../layouts/mixins/toc.pug
include ../layouts/mixins/blog-info.pug

block content
  main.tag-page(aria-labelledby="title")
    h1#title= postTag
    p.toc-welcome Articles tagged ‘#{postTag}’.
    - const posts = collections.posts.filter((p) => (p.data.postTags || []).includes(postTag));
    +posts(posts)
    +blog-info()

This creates a page for each tag at /tags/slug/ (where slug is the URI-friendly version of the tag). For instance, the ‘Gaming’ tag has a page at /tags/gaming. Then I use Pug’s each keyword to list all known tags on a single page in a new template:

Pug---
permalink: "/tags/"
dynamicPermalink: false
title: "All Tags"
---

extends ../layouts/index.pug

block content
  main.tags-list-page(aria-labelledby="title")
    h1#title= title
    - const tags = [...collections.postTags].sort(postUtils.compareLowercase);
    ul.tags-list
      each tag of tags
        li.tags-list__tag
          a(href=`/tags/${metadata.slug(tag)}/`)= tag

Giving us a very plain page which nonetheless serves the purpose: