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| author | Bradley Taunt <bt@btxx.org> | 2024-06-06 08:05:12 -0400 |
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| committer | Bradley Taunt <bt@btxx.org> | 2024-06-06 08:05:12 -0400 |
| commit | 6b742c459266b18e2b375b35205ce8a6c02f0452 (patch) | |
| tree | b16fbb9a045e33dd6c97eb5ab72e6ff4d9237ea3 /build/flexbox-bar-graphs/index.html | |
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diff --git a/build/flexbox-bar-graphs/index.html b/build/flexbox-bar-graphs/index.html new file mode 100644 index 0000000..a73e791 --- /dev/null +++ b/build/flexbox-bar-graphs/index.html @@ -0,0 +1,312 @@ +<!doctype html> +<html lang="en" id="top"> +<head> + <meta charset="utf-8"> + <meta name="viewport" content="width=device-width, initial-scale=1"> + <link rel="icon" href="data:,"> + <title>Pure CSS Bar Graphs with Graceful Mobile Fallbacks</title> + <link href="https://bt.ht/atom.xml" type="application/atom+xml" rel="alternate" title="Atom feed for blog posts" /> + <style>*{box-sizing:border-box;}body{font-family:sans-serif;margin:0 auto;max-width:650px;padding:1rem;}img{max-width:100%;}pre{overflow:auto;}table{text-align:left;width:100%;}</style> +</head> + +<nav> + <a href="#menu">Menu ↓</a> +</nav> + +<main> +<h1>Pure CSS Bar Graphs with Graceful Mobile Fallbacks</h1> +<p>2020-12-08</p> +<p>I recently published a new open source project, <a target="_blank" href="https://flexbox-bar-graphs.netlify.app/">Flexbox Bar Graphs</a>, and wanted to share a simple breakdown of how it was built. It isn't anything mind-blowing, but I like the idea of placing bar graphs in a web page with <em>zero</em> Javascript.</p> +<p>So in the end, this is what our bar graphs will look like on desktop:</p> +<p><figure> + <img src="/public/images/flexbox-bar-graph-1.webp" alt="Flexbox Bar Graph"> + <figcaption>The flexbox bar graph in desktop view (<a href="/public/images/flexbox-bar-graph-1.webp">direct link to image</a>)</figcaption> +</figure></p> +<p>And this is how it will look on smaller devices:</p> +<p><figure> + <img src="/public/images/flexbox-bar-graph-2.webp" alt="Flexbox Bar Graph Table"> + <figcaption>The flexbox bar graph on mobile devices (<a href="/public/images/flexbox-bar-graph-2.webp">direct link to image</a>)</figcaption> +</figure></p> +<p>Let's get into the details!</p> +<h2>The HTML</h2> +<p>The main "secret" of this project is that our graphs are constructed out of HTML <em>tables</em>. Now before you freak out - this is perfectly fine and works in our favor quite well.</p> +<ol> +<li>If the user has JS disabled --> they will still see our graphs</li> +<li>If the user has CSS disabled --> they will see a standard data table set</li> +</ol> +<p>All bases are covered!</p> +<pre><code><!-- Using a basic table with our custom data-id --> +<table data-id="flexbox-bar-graph"> + <caption>Web Performance Results</caption> + <thead> + <tr> + <th>Test Performed</th> + <th>Before</th> + <th>After</th> + <th>Difference</th> + </tr> + </thead> + <tbody> + <tr> + <th>Initial Load Time</th> + <td> + <!-- + WTF are these CSS variables? + See the CSS section below + --> + <span style="--data-set:4.7/5;"></span> + <p>4.7</p> + </td> + <td> + <span style="--data-set:2.7/5;"></span> + <p>2.7</p> + </td> + <td> + <span style="--data-set:2/5;"></span> + <p>2</p> + </td> + </tr> + </tbody> +</table> +</code></pre> +<p>Nothing crazy is happening here - just your standard HTML table structure. The one main thing to notice is the <code>--data-set</code> CSS variable placed inline on each data point. This will be important for our CSS to configure the individual bar graphs properly.</p> +<h2>The CSS</h2> +<p>This might look overwhelming if I just dumped the whole CSS file in one big code block, so instead I'm going to break them down into two parts:</p> +<ol> +<li>Baseline styling (mobile)</li> +<li>Desktop styling</li> +</ol> +<h3>Baseline</h3> +<p>Here we target just our table elements with the <code>data-id</code> of <code>flexbox-bar-graph</code>. This allows us to avoid worrying about adding classes or IDs and also avoids conflicts with other non-graph styled tables in our projects.</p> +<p>The base <code>:root</code> element holds all of our bar graph colors. Change these as you see fit!</p> +<pre><code>/* Bar Graph color variables */ +:root { + --bar-color-1: #357EC7; + --bar-color-2: #E42217; + --bar-color-3: #4CC417; + --bar-color-4: #7D0541; + --bar-color-5: #FFD801; +} +</code></pre> +<pre><code>[data-id="flexbox-bar-graph"] { + border-collapse: collapse; + margin: 4rem 0 6rem; + width: 100%; +} +[data-id="flexbox-bar-graph"] caption { + text-align: left; +} +[data-id="flexbox-bar-graph"] thead th { + text-align: right; +} +[data-id="flexbox-bar-graph"] thead th:nth-child(1), +[data-id="flexbox-bar-graph"] tbody th { + text-align: left; +} +[data-id="flexbox-bar-graph"] tbody th { + font-weight: normal; + font-style: italic; +} +[data-id="flexbox-bar-graph"] tbody td { + text-align: right; +} +[data-id="flexbox-bar-graph"] tbody td p { + margin: 0; +} +</code></pre> +<h3>Desktop</h3> +<p>Now we set your "visual" bar graphs to show at a set width (in this example it is 1000px and above). That way the "default" styling can target the mobile device screen sizes.</p> +<ul> +<li>The <code>thead tr th:nth-child(x):before</code> elements create the square "legends" beside each individual data point heading</li> +<li>The <code>tbody tr td:nth-of-type(x) span</code> elements are the bars themselves</li> +</ul> +<pre><code>@media(min-width: 1000px) { + [data-id="flexbox-bar-graph"] { + background: transparent; + display: block; + min-height: 400px; + padding: 0; + position: relative; + width: 100%; + } + + [data-id="flexbox-bar-graph"] caption { + display: block; + font-size: 2rem; + text-align: center; + width: 100%; + } + + [data-id="flexbox-bar-graph"] thead { + display: block; + margin: 2rem 0 3rem; + width: 100%; + } + [data-id="flexbox-bar-graph"] thead tr { + border-bottom: 1px solid lightgrey; + display: flex; + justify-content: center; + padding-bottom: 1rem; + } + + [data-id="flexbox-bar-graph"] thead tr th { + display: inline-block; + margin: 0; + padding: 0; + position: relative; + text-align: right; + } + [data-id="flexbox-bar-graph"] thead tr th:before { + content:''; + display: inline-block; + height: 10px; + margin: 0 0.5rem 0 2rem; + position: relative; + width: 10px; + } + [data-id="flexbox-bar-graph"] thead tr th:nth-child(1), + [data-id="flexbox-bar-graph"] thead tr th:nth-child(1):before { + display: none; + } + [data-id="flexbox-bar-graph"] thead tr th:nth-child(2):before { + background: var(--bar-color-1); + } + [data-id="flexbox-bar-graph"] thead tr th:nth-child(3):before { + background: var(--bar-color-2); + } + [data-id="flexbox-bar-graph"] thead tr th:nth-child(4):before { + background: var(--bar-color-3); + } + [data-id="flexbox-bar-graph"] thead tr th:nth-child(5):before { + background: var(--bar-color-4); + } + [data-id="flexbox-bar-graph"] thead tr th:nth-child(6):before { + background: var(--bar-color-5); + } + + [data-id="flexbox-bar-graph"] tbody { + display: flex; + justify-content: space-between; + min-height: 300px; + width: 100%; + } + + [data-id="flexbox-bar-graph"] tbody tr { + display: flex; + flex-direction: column-reverse; + flex-wrap: wrap; + justify-content: flex-end; + padding: 0 50px; + position: relative; + width: 100%; + } + [data-id="flexbox-bar-graph"] tbody tr th { + font-size: 90%; + position: absolute; + text-align: center; + top: 100%; + width: calc(100% - 100px); + } + [data-id="flexbox-bar-graph"] tbody tr td { + align-items: center; + display: flex; + flex-direction: column; + height: 95%; + justify-content: flex-end; + } + + [data-id="flexbox-bar-graph"] tbody tr td span { + display: block; + height: calc(var(--data-set) * 100%); + width: 20px; + } + [data-id="flexbox-bar-graph"] tbody tr td:nth-of-type(1) span { + background: var(--bar-color-1); + } + [data-id="flexbox-bar-graph"] tbody tr td:nth-of-type(2) span { + background: var(--bar-color-2); + } + [data-id="flexbox-bar-graph"] tbody tr td:nth-of-type(3) span { + background: var(--bar-color-3); + } + [data-id="flexbox-bar-graph"] tbody tr td:nth-of-type(4) span { + background: var(--bar-color-4); + } + [data-id="flexbox-bar-graph"] tbody tr td:nth-of-type(5) span { + background: var(--bar-color-5); + } + + [data-id="flexbox-bar-graph"] tbody tr td p { + font-size: 90%; + margin: 0; + text-align: center; + } +} +</code></pre> +<h2>Bonus Styling</h2> +<p>In the <a target="_blank" href="https://github.com/bradleytaunt/flexbox-bar-graphs">Flexbox Bar Graph</a> repo, I've also included the ability to display these bar graphs horizontally, like so:</p> +<p><figure> + <img src="/public/images/flexbox-bar-graph-3.webp" alt="Flexbox Bar Graph Horizontal"> + <figcaption>The flexbox bar graph in the horizontal layout (<a href="/public/images/flexbox-bar-graph-3.webp">direct link to image</a>)</figcaption> +</figure></p> +<p>The change in CSS is actually quite simple to pull this off - you just need to include the <code>data-layout</code> attribute on the table itself.</p> +<pre><code>[data-layout="horizontal"] tbody { + min-height: auto; +} + +[data-layout="horizontal"] tbody tr { + flex-direction: column; + padding: 0 40px; +} +[data-layout="horizontal"] tbody tr th { + width: calc(100% - 80px); +} + +[data-layout="horizontal"] tbody tr th { + text-align: left; + top: calc(100% + 20px); +} + +[data-layout="horizontal"] tbody tr td { + flex-direction: row; + height: auto; + justify-content: start; + margin: 10px 0; +} + +[data-layout="horizontal"] tbody tr td span { + height: 20px; + width: calc(var(--data-set) * 100%); +} + +[data-layout="horizontal"] tbody tr td p { + margin-left: 10px; +} +</code></pre> +<h2>That's All Folks!</h2> +<p>That just about sums things up. Feel free to check out the Github repo itself, open any issues you find or fork it for your own!</p> +<ul> +<li>Github: <a href="https://github.com/bradleytaunt/flexbox-bar-graphs">https://github.com/bradleytaunt/flexbox-bar-graphs</a></li> +<li>Live Demo: <a href="https://flexbox-bar-graphs.netlify.app/">https://flexbox-bar-graphs.netlify.app/</a></li> +</ul> +<footer role="contentinfo"> + <h2>Menu Navigation</h2> + <ul id="menu"> + <li><a href="/">Home</a></li> + <li><a href="/projects">Projects</a></li> + <li><a href="/uses">Uses</a></li> + <li><a href="/wiki">Wiki</a></li> + <li><a href="/resume">Resume</a></li> + <li><a href="/colophon">Colophon</a></li> + <li><a href="/now">Now</a></li> + <li><a href="/donate">Donate</a></li> + <li><a href="/atom.xml">RSS</a></li> + <li><a href="#top">↑ Top of the page</a></li> + </ul> + <small> + Built with <a href="https://git.sr.ht/~bt/barf">barf</a>. <br> + Maintained with ♥ for the web. <br> + Proud supporter of <a href="https://usefathom.com/ref/DKHJVX">Fathom</a> & <a href="https://nextdns.io/?from=74d3p3h8">NextDNS</a>. <br> + The content for this site is <a href="https://creativecommons.org/licenses/by-sa/2.0/">CC-BY-SA</a>.<br> The <a href="https://git.sr.ht/~bt/bt.ht">code for this site</a> is <a href="https://git.sr.ht/~bt/bt.ht/tree/master/item/LICENSE">MIT</a>. + </small> +</footer>
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