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Web site Developer I Advertising and marketing I Social Media Advertising and marketing I Content material Creators I Branding Creators I Administration I System SolutionHow To Construct A Progressively Enhanced, Accessible, Filterable And Paginated Record — Smashing Journal

Web site Developer I Advertising and marketing I Social Media Advertising and marketing I Content material Creators I Branding Creators I Administration I System SolutionHow To Construct A Progressively Enhanced, Accessible, Filterable And Paginated Record — Smashing Journal

Web site Developer I Advertising and marketing I Social Media Advertising and marketing I Content material Creators I Branding Creators I Administration I System Resolution

Fast abstract ↬
Ever puzzled how you can construct a paginated checklist that works with and with out JavaScript? On this article, Manuel explains how one can leverage the facility of Progressive Enhancement and just do that with Eleventy and Alpine.js.

Most websites I construct are static websites with HTML information generated by a static web site generator or pages served on a server by a CMS like WordPress or CraftCMS. I exploit JavaScript solely on prime to boost the person expertise. I exploit it for issues like disclosure widgets, accordions, fly-out navigations, or modals.

The necessities for many of those options are easy, so utilizing a library or framework could be overkill. Lately, nonetheless, I discovered myself in a scenario the place writing a part from scratch in Vanilla JS with out the assistance of a framework would’ve been too difficult and messy.

Light-weight Frameworks

My activity was so as to add a number of filters, sorting and pagination to an current checklist of things. I didn’t need to use a JavaScript Framework like Vue or React, solely as a result of I wanted assist in some locations on my web site, and I didn’t need to change my stack. I consulted Twitter, and folks prompt minimal frameworks like lit, petite-vue, hyperscript, htmx or Alpine.js. I went with Alpine as a result of it sounded prefer it was precisely what I used to be on the lookout for:

“Alpine is a rugged, minimal device for composing conduct straight in your markup. Consider it like jQuery for the trendy net. Plop in a script tag and get going.”

Alpine.js

Alpine is a light-weight (~7KB) assortment of 15 attributes, 6 properties, and a pair of strategies. I gained’t go into the fundamentals of it (try this article about Alpine by Hugo Di Francesco or learn the Alpine docs), however let me rapidly introduce you to Alpine:

Be aware: You possibly can skip this intro and go straight to the principal content material of the article when you’re already conversant in Alpine.js.

Let’s say we need to flip a easy checklist with many objects right into a disclosure widget. You could possibly use the native HTML components: particulars and abstract for that, however for this train, I’ll use Alpine.

By default, with JavaScript disabled, we present the checklist, however we need to cover it and permit customers to open and shut it by urgent a button if JavaScript is enabled:

<h2>Beastie Boys Anthology</h2>
<p>The Sounds of Science is the primary anthology album by American rap rock group Beastie Boys composed of best hits, B-sides, and beforehand unreleased tracks.</p>
<ol>
  <li>Beastie Boys</li>
  <li>Sluggish And Low</li>
  <li>Shake Your Rump</li>
  <li>Gratitude</li>
  <li>Expertise To Pay The Payments</li>
  <li>Root Down</li>
  <li>Imagine Me</li>
  …
</ol>

First, we embody Alpine utilizing a script tag. Then we wrap the checklist in a div and use the x-data directive to cross knowledge into the part. The open property inside the thing we handed is offered to all kids of the div:

<div x-data="{ open: false }">
  <ol>
    <li>Beastie Boys</li>
    <li>Sluggish And Low</li>
    …
  </ol>
</div>

<script src="https://unpkg.com/alpinejs@3.9.1/dist/cdn.min.js" integrity="sha384-mDHH3kdyMS0F6QcfHCxEgPMMjssTurzucc7Jct3g1GOfB4p7PxJuugPP1NOLvE7I" crossorigin="nameless"></script>

We are able to use the open property for the x-show directive, which determines whether or not or not a component is seen:

<div x-data="{ open: false }">
  <ol x-show="open">
    <li>Beastie Boys</li>
    <li>Sluggish And Low</li>
    …
  </ol>
</div>

Since we set open to false, the checklist is hidden now.

Subsequent, we’d like a button that toggles the worth of the open property. We are able to add occasions by utilizing the x-on:click on directive or the shorter @-Syntax @click on:

<div x-data="{ open: false }">
  <button @click on="open = !open">Tracklist</button>
  
  <ol x-show="open">
    <li>Beastie Boys</li>
    <li>Sluggish And Low</li>
    …
  </ol>
</div>

Urgent the button, open now switches between false and true and x-show reactively watches these modifications, displaying and hiding the checklist accordingly.

Whereas this works for keyboard and mouse customers, it’s ineffective to display reader customers, as we have to talk the state of our widget. We are able to do this by toggling the worth of the aria-expanded attribute:

<button @click on="open = !open" :aria-expanded="open">
  Tracklist
</button>

We are able to additionally create a semantic connection between the button and the checklist utilizing aria-controls for display readers that help the attribute:

<button @click on="open = ! open" :aria-expanded="open" aria-controls="tracklist">
  Tracklist
</button>
<ol x-show="open" id="tracklist">
  …
</ol>

Right here’s the ultimate end result:

See the Pen [Simple disclosure widget with Alpine.js](https://codepen.io/smashingmag/pen/xxpdzNz) by Manuel Matuzovic.

See the Pen Easy disclosure widget with Alpine.js by Manuel Matuzovic.

Fairly neat! You possibly can improve current static content material with JavaScript with out having to jot down a single line of JS. After all, you could want to jot down some JavaScript, particularly when you’re engaged on extra complicated parts.

A Static, Paginated Record

Okay, now that we all know the fundamentals of Alpine.js, I’d say it’s time to construct a extra complicated part.

Be aware: You possibly can check out the ultimate end result earlier than we get began.

I need to construct a paginated checklist of my vinyl data that works with out JavaScript. We’ll use the static web site generator eleventy (or quick “11ty”) for that and Alpine.js to boost it by making the checklist filterable.

A picture with vinyls standing in a row
Anybody else right here additionally a fan of vinyl data? 😉 (Giant preview)

Setup

Earlier than we get began, let’s arrange our web site. We want:

  • a undertaking folder for our web site,
  • 11ty to generate HTML information,
  • an enter file for our HTML,
  • an information file that accommodates the checklist of data.

In your command line, navigate to the folder the place you need to save the undertaking, create a folder, and cd into it:

cd Websites # or wherever you need to save the undertaking
mkdir myrecordcollection # decide any title
cd myrecordcollection

Then create a bundle.json file and set up eleventy:

npm init -y
npm set up @11ty/eleventy

Subsequent, create an index.njk file (.njk means this can be a Nunjucks file; extra about that under) and a folder _data with a data.json:

contact index.njk
mkdir _data
contact _data/data.json

You don’t must do all these steps on the command line. You can even create folders and information in any person interface. The ultimate file and folder construction appears to be like like this:

A screenshot of the final file and the folder structure
(Giant preview)

Including Content material

11ty means that you can write content material straight into an HTML file (or Markdown, Nunjucks, and different template languages). You possibly can even retailer knowledge within the entrance matter or in a JSON file. I don’t need to handle a whole lot of entries manually, so I’ll retailer them within the JSON file we simply created. Let’s add some knowledge to the file:

[
  {
    "artist": "Akne Kid Joe",
    "title": "Die große Palmöllüge",
    "year": 2020
  },
  {
    "artist": "Bring me the Horizon",
    "title": "Post Human: Survial Horror",
    "year": 2020
  },
  {
    "artist": "Idles",
    "title": "Joy as an Act of Resistance",
    "year": 2018
  },
  {
    "artist": "Beastie Boys",
    "title": "Licensed to Ill",
    "year": 1986
  },
  {
    "artist": "Beastie Boys",
    "title": "Paul's Boutique",
    "year": 1989
  },
  {
    "artist": "Beastie Boys",
    "title": "Check Your Head",
    "year": 1992
  },
  {
    "artist": "Beastie Boys",
    "title": "Ill Communication",
    "year": 1994
  }
]

Lastly, let’s add a fundamental HTML construction to the index.njk file and begin eleventy:

<!DOCTYPE html>
<html lang="en">
<head>
  <meta charset="UTF-8">
  <meta title="viewport" content material="width=device-width, initial-scale=1.0">
    
  <title>My Report Assortment</title>
</head>
<physique>
  <h1>My Report Assortment</h1>
    
</physique>
</html>

By working the next command it is best to be capable of entry the location at http://localhost:8080:

eleventy --serve
A screenshot where the site showing the heading ‘My Record Collection
Eleventy working on port :8080. The location simply exhibits the heading ‘My Report Assortment’. (Giant preview)

Displaying Content material

Now let’s take the info from our JSON file and switch it into HTML. We are able to entry it by looping over the data object in nunjucks:

<div class="assortment">
  <ol>
    {% for file in data %}
    <li>
      <sturdy>{{ file.title }}</sturdy><br>
      Launched in <time datetime="{{ file.12 months }}">{{ file.12 months }}</time> by {{ file.artist }}.
    </li>
    {% endfor %}
  </ol>
</div>
A screenshot with 7 Records listed, each with their title, artist and release date
7 Data listed, every with their title, artist and launch date. (Giant preview)

Eleventy helps pagination out of the field. All we now have to do is add a frontmatter block to our web page, inform 11ty which dataset it ought to use for pagination, and eventually, we now have to adapt our for loop to make use of the paginated checklist as an alternative of all data:

---
pagination:
  knowledge: data
  dimension: 5
---
<!DOCTYPE html>
<html lang="en">
  <head>
    <meta charset="UTF-8">
    <meta title="viewport" content material="width=device-width, initial-scale=1.0">
      
    <title>My Report Assortment</title>
  </head>
  <physique>
    <h1>My Report Assortment</h1>
  
    <div class="assortment">
      <p id="message">Displaying <output>{{ data.size }} data</output></p>
      
      <div aria-labelledby="message" position="area">
        <ol class="data">
          {% for file in pagination.objects %}
          <li>
            <sturdy>{{ file.title }}</sturdy><br>
            Launched in <time datetime="{{ file.12 months }}">{{ file.12 months }}</time> by {{ file.artist }}.
          </li>
          {% endfor %}
        </ol>
      </div>
    </div>
  </physique>
</html>

In the event you entry the web page once more, the checklist solely accommodates 5 objects. You can even see that I’ve added a standing message (ignore the output aspect for now), wrapped the checklist in a div with the position “area”, and that I’ve labelled it by making a reference to #message utilizing aria-labelledby. I did that to show it right into a landmark and permit display reader customers to entry the checklist of outcomes straight utilizing keyboard shortcuts.

Subsequent, we’ll add a navigation with hyperlinks to all pages created by the static web site generator. The pagination object holds an array that accommodates all pages. We use aria-current="web page" to spotlight the present web page:

<nav aria-label="Choose a web page">
  <ol class="pages">
    {% for page_entry in pagination.pages %}
      {%- set page_url = pagination.hrefs[loop.index0] -%}
      <li>
        <a href="https://smashingmagazine.com/2022/04/accessible-filterable-paginated-list-11ty-alpinejs/{{ page_url }}"{% if web page.url == page_url %} aria-current="web page"{% endif %}>
          Web page {{ loop.index }}
        </a>
      </li>
    {% endfor %}
  </ol>
</nav>

Lastly, let’s add some fundamental CSS to enhance the styling:

physique {
  font-family: sans-serif;
  line-height: 1.5;
}

ol {
  list-style: none;
  margin: 0;
  padding: 0;
}

.data > * + * {
  margin-top: 2rem;
}

h2 {
  margin-bottom: 0;
}

nav {
  margin-top: 1.5rem;
}

.pages {
  show: flex;
  flex-wrap: wrap;
  hole: 0.5rem;
}

.pages a {
  border: 1px strong #000000;
  padding: 0.5rem;
  border-radius: 5px;
  show: flex;
  text-decoration: none;
}

.pages a:the place([aria-current]) {
  background-color: #000000;
  shade: #ffffff;
}

.pages a:the place(:focus, :hover) {
  background-color: #6c6c6c;
  shade: #ffffff;
}
A screenshot with 7 Records listed, each with their title, artist and release date, with links to all pages and a highlighted current page
(Giant preview)

You possibly can see it in motion within the stay demo and you’ll try the code on GitHub.

This works pretty effectively with 7 data. It’d even work with 10, 20, or 50, however I’ve over 400 data. We are able to make shopping the checklist simpler by including filters.

Extra after leap! Proceed studying under ↓

A Dynamic Paginated And Filterable Record

I like JavaScript, however I additionally imagine that the core content material and performance of a web site must be accessible with out it. This doesn’t imply which you could’t use JavaScript in any respect, it simply signifies that you begin with a fundamental server-rendered basis of your part or web site, and also you add performance layer by layer. That is known as progressive enhancement.

Our basis on this instance is the static checklist created with 11ty, and now we add a layer of performance with Alpine.

First, proper earlier than the closing physique tag, we reference the newest model (as of writing 3.9.1) of Alpine.js:

 <script src="https://unpkg.com/alpinejs@3.9.1/dist/cdn.min.js" integrity="sha384-mDHH3kdyMS0F6QcfHCxEgPMMjssTurzucc7Jct3g1GOfB4p7PxJuugPP1NOLvE7I" crossorigin="nameless"></script>
</physique>

Be aware: Watch out utilizing a third-party CDN, this may have all types of damaging implications (efficiency, privateness, safety). Think about referencing the file domestically or importing it as a module.
In case you’re questioning why you don’t see the Subresource Integrity hash within the official docs, it’s as a result of I’ve created and added it manually.

Since we’re shifting into JavaScript-world, we have to make our data obtainable to Alpine.js. In all probability not the perfect, however the quickest resolution is to create a .eleventy.js file in your root folder and add the next traces:

module.exports = operate(eleventyConfig) {
    eleventyConfig.addPassthroughCopy("_data");
};

This ensures that eleventy doesn’t simply generate HTML information, but it surely additionally copies the contents of the _data folder into our vacation spot folder, making it accessible to our scripts.

Fetching Knowledge

Similar to within the earlier instance, we’ll add the x-data directive to our part to cross knowledge:

<div class="assortment" x-data="{ data: [] }">
</div>

We don’t have any knowledge, so we have to fetch it because the part initialises. The x-init directive permits us to hook into the initialisation part of any aspect and carry out duties:

<div class="assortment" x-init="data = await (await fetch('/_data/data.json')).json()" x-data="{ data: [] }">
  <div x-text="data"></div>
  […]
</div>

If we output the outcomes straight, we see a listing of [object Object]s, as a result of we’re fetching and receiving an array. As a substitute, we must always iterate over the checklist utilizing the x-for directive on a template tag and output the info utilizing x-text:

<template x-for="file in data">
  <li>
    <sturdy x-text="file.title"></sturdy><br>
    Launched in <time :datetime="file.12 months" x-text="file.12 months"></time> by <span x-text="file.artist"></span>.
  </li>
</template>

The <template> HTML aspect is a mechanism for holding HTML that isn’t to be rendered instantly when a web page is loaded however could also be instantiated subsequently throughout runtime utilizing JavaScript.

MDN: <template>: The Content material Template Aspect

Right here’s how the entire checklist appears to be like like now:

<div class="assortment" x-init="data = await (await fetch('/_data/data.json')).json()" x-data="{ data: [] }">
  <p id="message">Displaying <output>{{ data.size }} data</output></p>
  
  <div aria-labelledby="message" position="area">
    <ol class="data">  
      <template x-for="file in data">
        <li>
          <sturdy x-text="file.title"></sturdy><br>
          Launched in <time :datetime="file.12 months" x-text="file.12 months"></time> by <span x-text="file.artist"></span>.
        </li>
      </template>
      
      {%- for file in pagination.objects %}
        <li>
          <sturdy>{{ file.title }}</sturdy><br>
          Launched in <time datetime="{{ file.12 months }}">{{ file.12 months }}</time> by {{ file.artist }}.
        </li>
      {%- endfor %}
    </ol>
  </div>
  […]
</div>

Isn’t it wonderful how rapidly we have been in a position to fetch and output knowledge? Try the demo under to see how Alpine populates the checklist with outcomes.

Trace: You don’t see any Nunjucks code on this CodePen, as a result of 11ty doesn’t run within the browser. I’ve simply copied and pasted the rendered HTML of the primary web page.

See the Pen [Pagination + Filter with Alpine.js Step 1](https://codepen.io/smashingmag/pen/abEWRMY) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 1 by Manuel Matuzovic.

You possibly can obtain quite a bit by utilizing Alpine’s directives, however in some unspecified time in the future relying solely on attributes can get messy. That’s why I’ve determined to maneuver the info and among the logic right into a separate Alpine part object.

Right here’s how that works: As a substitute of passing knowledge straight, we now reference a part utilizing x-data. The remainder is just about similar: Outline a variable to carry our knowledge, then fetch our JSON file within the initialization part. Nonetheless, we don’t do this inside an attribute, however inside a script tag or file as an alternative:

<div class="assortment" x-data="assortment">
  […]
</div>

[…]

<script>
  doc.addEventListener('alpine:init', () => {
    Alpine.knowledge('assortment', () => ({
      data: [],
      async getRecords() {
        this.data = await (await fetch('/_data/data.json')).json();
      },
      init() {
        this.getRecords();
      }
    }))
  })
</script>

<script src="https://unpkg.com/alpinejs@3.9.1/dist/cdn.min.js" integrity="sha384-mDHH3kdyMS0F6QcfHCxEgPMMjssTurzucc7Jct3g1GOfB4p7PxJuugPP1NOLvE7I" crossorigin="nameless"></script>

Trying on the earlier CodePen, you’ve in all probability observed that we now have a replica set of information. That’s as a result of our static 11ty checklist continues to be there. Alpine has a directive that tells it to disregard sure DOM components. I don’t know if that is really vital right here, but it surely’s a pleasant approach of marking these undesirable components. So, we add the x-ignore directive on our 11ty checklist objects, and we add a category to the html aspect when the info has loaded after which use the category and the attribute to cover these checklist objects in CSS:

<fashion>
  .alpine [x-ignore] {
    show: none;
  }
</fashion>

[…]
{%- for file in pagination.objects %}
  <li x-ignore>
    <sturdy>{{ file.title }}</sturdy><br>
    Launched in <time datetime="{{ file.12 months }}">{{ file.12 months }}</time> by {{ file.artist }}.
  </li>
{%- endfor %}
[…]
<script>
  doc.addEventListener('alpine:init', () => {
    Alpine.knowledge('assortment', () => ({
      data: [],
      async getRecords() {
        this.data = await (await fetch('/_data/data.json')).json();
        doc.documentElement.classList.add('alpine');
      },
      init() {
        this.getRecords();
      }
    }))
  })
</script>

11ty knowledge is hidden, outcomes are coming from Alpine, however the pagination just isn’t purposeful in the intervening time:

See the Pen [Pagination + Filter with Alpine.js Step 2](https://codepen.io/smashingmag/pen/eYyWQOe) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 2 by Manuel Matuzovic.

Earlier than we add filters, let’s paginate our knowledge. 11ty did us the favor of dealing with all of the logic for us, however now we now have to do it on our personal. With the intention to cut up our knowledge throughout a number of pages, we’d like the next:

  • the variety of objects per web page (itemsPerPage),
  • the present web page (currentPage),
  • the overall variety of pages (numOfPages),
  • a dynamic, paged subset of the entire knowledge (web page).
doc.addEventListener('alpine:init', () => {
  Alpine.knowledge('assortment', () => ({
    data: [],
    itemsPerPage: 5,
    currentPage: 0,
    numOfPages: // whole variety of pages,
    web page: // paged objects
    async getRecords() {
      this.data = await (await fetch('/_data/data.json')).json();
      doc.documentElement.classList.add('alpine');
    },
    init() {
      this.getRecords();
     }
  }))
})

The variety of objects per web page is a hard and fast worth (5), and the present web page begins with 0. We get the variety of pages by dividing the overall variety of objects by the variety of objects per web page:

numOfPages() {
  return Math.ceil(this.data.size / this.itemsPerPage)
  // 7 / 5 = 1.4
  // Math.ceil(7 / 5) = 2
},

The simplest approach for me to get the objects per web page was to make use of the slice() technique in JavaScript and take out the slice of the dataset that I want for the present web page:

web page() {
  return this.data.slice(this.currentPage * this.itemsPerPage, (this.currentPage + 1) * this.itemsPerPage)

  // this.currentPage * this.itemsPerPage, (this.currentPage + 1) * this.itemsPerPage
  // Web page 1: 0 * 5, (0 + 1) * 5 (=> slice(0, 5);)
  // Web page 2: 1 * 5, (1 + 1) * 5 (=> slice(5, 10);)
  // Web page 3: 2 * 5, (2 + 1) * 5 (=> slice(10, 15);)
}

To solely show the objects for the present web page, we now have to adapt the for loop to iterate over web page as an alternative of data:

<ol class="data"> 
  <template x-for="file in web page">
    <li>
      <sturdy x-text="file.title"></sturdy><br>
      Launched in <time :datetime="file.12 months" x-text="file.12 months"></time> by <span x-text="file.artist"></span>.
    </li>
  </template>
</ol>

We now have a web page, however no hyperlinks that enable us to leap from web page to web page. Similar to earlier, we use the template aspect and the x-for directive to show our web page hyperlinks:

<ol class="pages">
  <template x-for="idx in numOfPages">
    <li>
      <a :href="https://smashingmagazine.com/2022/04/accessible-filterable-paginated-list-11ty-alpinejs/`/${idx}`" x-text="`Web page ${idx}`" :aria-current="idx === currentPage + 1 ? 'web page' : false" @click on.stop="currentPage = idx - 1"></a>
    </li>
  </template>
  
  {% for page_entry in pagination.pages %}
    <li x-ignore>
      […]
    </li>
  {% endfor %}
</ol>

Since we don’t need to reload the entire web page anymore, we put a click on occasion on every hyperlink, stop the default click on conduct, and alter the present web page quantity on click on:

<a href="https://smashingmagazine.com/" @click on.stop="currentPage = idx - 1"></a>

Right here’s what that appears like within the browser. (I’ve added extra entries to the JSON file. You possibly can obtain it on GitHub.)

See the Pen [Pagination + Filter with Alpine.js Step 3](https://codepen.io/smashingmag/pen/GRymwjg) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 3 by Manuel Matuzovic.

Filtering

I need to have the ability to filter the checklist by artist and by decade.

We add two choose components wrapped in a fieldset to our part, and we put a x-model directive on every of them. x-model permits us to bind the worth of an enter aspect to Alpine knowledge:

<fieldset class="filters">
  <legend>Filter by</legend>

  <label for="artist">Artist</label>
  <choose id="artist" x-model="filters.artist">
    <possibility worth="">All</possibility>
  </choose>

  <label for="decade">Decade</label>
  <choose id="decade" x-model="filters.12 months">
    <possibility worth="">All</possibility>
  </choose>
</fieldset>

After all, we additionally must create these knowledge fields in our Alpine part:

doc.addEventListener('alpine:init', () => {
  Alpine.knowledge('assortment', () => ({
      filters: {
        12 months: '',
        artist: '',
      },
      data: [],
      itemsPerPage: 5,
      currentPage: 0,
      numOfPages() {
        return Math.ceil(this.data.size / this.itemsPerPage)
      },
      web page() {
        return this.data.slice(this.currentPage * this.itemsPerPage, (this.currentPage + 1) * this.itemsPerPage)
      },
      async getRecords() {
        this.data = await (await fetch('/_data/data.json')).json();
        doc.documentElement.classList.add('alpine');
      },
      init() {
        this.getRecords();
      }
  }))
})

If we alter the chosen worth in every choose, filters.artist and filters.12 months will replace mechanically. You possibly can attempt it right here with some dummy knowledge I’ve added manually:

See the Pen [Pagination + Filter with Alpine.js Step 4](https://codepen.io/smashingmag/pen/GGRymwEp) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 4 by Manuel Matuzovic.

Now we now have choose components, and we’ve certain the info to our part. The following step is to populate every choose dynamically with artists and a long time respectively. For that we take our data array and manipulate the info a bit:

doc.addEventListener('alpine:init', () => {
  Alpine.knowledge('assortment', () => ({
    artists: [],
    a long time: [],
    // […]
    async getRecords() {
      this.data = await (await fetch('/_data/data.json')).json();
      this.artists = [...new Set(this.records.map(record => record.artist))].kind();
      this.a long time = [...new Set(this.records.map(record => record.year.toString().slice(0, -1)))].kind();
      doc.documentElement.classList.add('alpine');
    },
    // […]
  }))
})

This appears to be like wild, and I’m certain that I’ll neglect what’s occurring right here actual quickly, however what this code does is that it takes the array of objects and turns it into an array of strings (map()), it makes certain that every entry is exclusive (that’s what [...new Set()] does right here) and kinds the array alphabetically (kind()). For the last decade’s array, I’m moreover slicing off the final digit of the 12 months as a result of I don’t need this filter to be too granular. Filtering by decade is sweet sufficient.

Subsequent, we populate the artist and decade choose components, once more utilizing the template aspect and the x-for directive:

<label for="artist">Artist</label>
<choose id="artist" x-model="filters.artist">
  <possibility worth="">All</possibility>
  <template x-for="artist in artists">
    <possibility x-text="artist"></possibility>
  </template>
</choose>

<label for="decade">Decade</label>
<choose id="decade" x-model="filters.12 months">
  <possibility worth="">All</possibility>
  <template x-for="12 months in a long time">
    <possibility :worth="12 months" x-text="`${12 months}0`"></possibility>
  </template>
</choose>

Attempt it your self in demo 5 on Codepen.

See the Pen [Pagination + Filter with Alpine.js Step 5](https://codepen.io/smashingmag/pen/OJzmaZb) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 5 by Manuel Matuzovic.

We’ve efficiently populated the choose components with knowledge from our JSON file. To lastly filter the info, we undergo all data, we examine whether or not a filter is ready. If that’s the case, we examine that the respective area of the file corresponds to the chosen worth of the filter. If not, we filter this file out. We’re left with a filtered array that matches the factors:

get filteredRecords() {
  const filtered = this.data.filter((merchandise) => {
    for (var key on this.filters) {
      if (this.filters[key] === '') {
        proceed
      }

      if(!String(merchandise[key]).contains(this.filters[key])) {
        return false
      }
    }

    return true
  });

  return filtered
}

For this to take impact we now have to adapt our numOfPages() and web page() capabilities to make use of solely the filtered data:

numOfPages() {
  return Math.ceil(this.filteredRecords.size / this.itemsPerPage)
},
web page() {
  return this.filteredRecords.slice(this.currentPage * this.itemsPerPage, (this.currentPage + 1) * this.itemsPerPage)
},

See the Pen [Pagination + Filter with Alpine.js Step 6](https://codepen.io/smashingmag/pen/GRymwQZ) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 6 by Manuel Matuzovic.

Three issues left to do:

  1. repair a bug;
  2. cover the shape;
  3. replace the standing message.

Bug Repair: Watching a Element Property

If you open the primary web page, click on on web page 6, then choose “1990” — you don’t see any outcomes. That’s as a result of our filter thinks that we’re nonetheless on web page 6, however 1) we’re really on web page 1, and a pair of) there isn’t any web page 6 with “1990” energetic. We are able to repair that by resetting the currentPage when the person modifications one of many filters. To look at modifications within the filter object, we will use a so-called magic technique:

init() {
  this.getRecords();
  this.$watch('filters', filter => this.currentPage = 0);
}

Each time the filter property modifications, the currentPage will probably be set to 0.

Hiding the Kind

For the reason that filters solely work with JavaScript enabled and functioning, we must always cover the entire kind when that’s not the case. We are able to use the .alpine class we created earlier for that:

<fieldset class="filters" hidden>
  […]
</fieldset>
.filters {
  show: block;
}

html:not(.alpine) .filters {
  visibility: hidden;
}

I’m utilizing visibility: hidden as an alternative of hidden solely to keep away from content material shifting whereas Alpine continues to be loading.

Speaking Modifications

The standing message initially of our checklist nonetheless reads “Displaying 7 data”, however this doesn’t change when the person modifications the web page or filters the checklist. There are two issues we now have to do to make the paragraph dynamic: bind knowledge to it and talk modifications to assistive know-how (a display reader, e.g.).

First, we bind knowledge to the output aspect within the paragraph that modifications based mostly on the present web page and filter:

<p id="message">Displaying <output x-text="message">{{ data.size }} data</output></p>
Alpine.knowledge('assortment', () => ({
  message() {
    return `${this.filteredRecords.size} data`;
  },
// […]

Subsequent, we need to talk to display readers that the content material on the web page has modified. There are at the least two methods of doing that:

  1. We might flip a component right into a so-called stay area utilizing the aria-live attribute. A stay area is a component that says its content material to display readers each time it modifications.
    <div aria-live="well mannered">Dynamic modifications will probably be introduced</div>

    In our case, we don’t must do something, as a result of we’re already utilizing the output aspect (keep in mind?) which is an implicit stay area by default.

    <p id="message">Displaying <output x-text="message">{{ data.size }} data</output></p>

    “The <output> HTML aspect is a container aspect into which a web site or app can inject the outcomes of a calculation or the result of a person motion.”

    Supply: <output>: The Output Aspect, MDN Net Docs

  2. We might make the area focusable and transfer the main focus to the area when its content material modifications. For the reason that area is labelled, its title and position will probably be introduced when that occurs.
    <div aria-labelledby="message" position="area" tabindex="-1" x-ref="area">

    We are able to reference the area utilizing the x-ref directive.

    <a @click on.stop="currentPage = idx - 1; $nextTick(() => { $refs.area.focus(); $refs.area.scrollIntoView(); });" :href="https://smashingmagazine.com/2022/04/accessible-filterable-paginated-list-11ty-alpinejs/`/${idx}`" x-text="`Web page ${idx}`" :aria-current="idx === currentPage + 1 ? 'web page' : false">

I’ve determined to do each:

  1. When customers filter the web page, we replace the stay area, however we don’t transfer focus.
  2. Once they change the web page, we transfer focus to the checklist.

That’s it. Right here’s the closing end result:

See the Pen [Pagination + Filter with Alpine.js Step 7](https://codepen.io/smashingmag/pen/zYpwMXX) by Manuel Matuzovic.

See the Pen Pagination + Filter with Alpine.js Step 7 by Manuel Matuzovic.

Be aware: If you filter by artist, and the standing message exhibits “1 data”, and also you filter once more by one other artist, additionally with only one file, the content material of the output aspect doesn’t change, and nothing is reported to display readers. This may be seen as a bug or as a function to scale back redundant bulletins. You’ll have to check this with customers.

What’s Subsequent?

What I did right here might sound redundant, however when you’re like me, and also you don’t have sufficient belief in JavaScript, it’s well worth the effort. And when you have a look at the closing CodePen or the full code on GitHub, it really wasn’t that a lot additional work. Minimal frameworks like Alpine.js make it very easy to progressively improve static parts and make them reactive.

I’m fairly pleased with the end result, however there are a number of extra issues that could possibly be improved:

  1. The pagination could possibly be smarter (most variety of pages, earlier and subsequent hyperlinks, and so forth).
  2. Let customers decide the variety of objects per web page.
  3. Sorting could be a pleasant function.
  4. Working with the historical past API could be nice.
  5. Content material shifting might be improved.
  6. The answer wants person testing and browser/display reader testing.

P.S. Sure, I do know, Alpine produces invalid HTML with its customized x- attribute syntax. That hurts me as a lot because it hurts you, however so long as it doesn’t have an effect on customers, I can stay with that. 🙂

P.S.S. Particular because of Scott, Søren, Thain, David, Saptak and Christian for his or her suggestions.

Additional Sources

Smashing Editorial
(vf, yk, il)

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