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<title>Using Parent Selectors in CSS</title>
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<h1>Using Parent Selectors in CSS</h1>
<p>2018-12-19</p>
<p>I recently saw a Twitter thread posted by <a href="https://twitter.com/innovati/status/1068998114491678720">Tommy Hodgins</a> on implementing highly requested styling features in CSS with only a minimal amount of JavaScript. Many of his examples are great, but the <code>parent</code> selector instantly peaked my interest.</p>
<p>Being able to target an element's parent always becomes a minor annoyance (since vanilla CSS does not support it) - so you always end up having to do something a little ugly like:</p>
<pre><code>var el = document.getElementById('custom-div');
var parent = el.closest(selectors);
</code></pre>
<p>And then add any custom styling to the parent element directly in JavaScript - or toggle a class which opens a whole other can of worms.</p>
<h2>Save the day with <a href="https://www.npmjs.com/package/jsincss-parent-selector">jsincss-parent-selector</a> and <a href="https://github.com/tomhodgins/qaffeine">qaffeine</a></h2>
<p>By using the <code>jsincss-parent-selector</code> and <code>qaffeine</code> plugins we can target an element's parent in CSS without breaking a sweat. Let's break it down:</p>
<h3>Import the packages</h3>
<pre><code>npm install jsincss-parent-selector qaffeine
</code></pre>
<h3>HTML (ex. index.html)</h3>
<p>Now we add our very simple HTML skeleton:</p>
<pre><code><!doctype html>
<html>
<head>
<link rel="stylesheet" href="output.css">
</head>
<body>
<header>
<main>
<h2>This is a header</h2>
</main>
</header>
</body>
<script src=output.js></script>
</html>
</code></pre>
<h3>JavaScript (ex. input.js)</h3>
<pre><code>const qaffeine = require('qaffeine')
const parent = require('jsincss-parent-selector')
qaffeine(
{
stylesheet: {},
rules: {
parent
}
},
'input.css',
'output.js',
'output.css'
)
</code></pre>
<h3>CSS (ex. input.css)</h3>
<pre><code>header {
display: block;
}
main[--js-parent] {
background: blue;
}
</code></pre>
<p>Then simply run <code>node</code> against your <code>js</code> file. That's it! I would also suggest checking out Tommy's <a href="https://www.youtube.com/watch?v=rG8cLe7VbW0">video covering this topic</a> if you prefer to follow along.</p>
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