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<title>Animated Radio Tab Toggles</title>
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<h1>Animated Radio Tab Toggles</h1>
<p>2021-01-05</p>
<p><em>In this demo tutorial, we are making the assumption</em> that we need to create a radio slide toggle for our made-up payment options. For this we want to display 3 simple payment choices to the user:</p>
<ul>
<li>One-time payment</li>
<li>Recurring payment</li>
<li>Free tier payment</li>
</ul>
<h2>The Final Demo</h2>
<p><a href="https://codepen.io/bradleytaunt/embed/vYXjpLO">Live CodePen</a></p>
<p>Let’s get started with the base skeleton.</p>
<h2>The HTML</h2>
<p><p>There isn't anything special happening here. We just contain all our <code>labels</code> and <code>inputs</code> into a <code>.radio-toggles</code> wrapper, make sure those <code>labels</code> are each properly connected to their corresponding <code>inputs</code>, and then add an empty <code>.slide-item</code> element (more on that later).</p></p>
<pre><code><div class="radio-toggles">
<input type="radio" id="option-1" name="radio-options">
<label for="option-1">One-Time</label>
<input type="radio" id="option-2" name="radio-options" checked>
<label for="option-2">Recurring</label>
<input type="radio" id="option-3" name="radio-options">
<label for="option-3">Free</label>
<div class="slide-item"></div>
</div>
</code></pre>
<h2>The CSS</h2>
<p>Now for the main event – the CSS. First we want to style the wrapper that holds all of our pieces together. You can tweak this to your liking, but I prefer a simple and clean style:</p>
<pre><code>.radio-toggles {
align-items: center;
background: #eee;
border: 1px solid lightgrey;
border-radius: 9999px;
display: flex;
justify-content: center;
margin: 20px auto;
max-width: 400px;
overflow: hidden;
padding: 4px;
position: relative;
}
</code></pre>
<p>Next, we “hide” (only visually) the default <code>radio</code> inputs:</p>
<pre><code>input[type="radio"] {
left: -9999px;
position: absolute;
z-index: -1;
}
</code></pre>
<p>Then we give the corresponding <code>label</code> elements a little spacing and breathing room:</p>
<pre><code>label {
cursor: pointer;
padding: 10px 20px;
text-align: center;
width: 33.33%;
z-index: 2;
}
</code></pre>
<p>Remember that <code>.slide-item</code> I referenced earlier? That element will be the visual “slider” that animates between the individual radio options. We style that like so:</p>
<pre><code>.slide-item {
background: white;
border-radius: 9999px;
box-shadow: 0 2px 4px rgba(0,0,0,0.15);
height: calc(100% - 8px);
left: calc(33.33% + 4px);
position: absolute;
width: calc(33.33% - 8px);
transition: left .4s;
z-index: 0;
}
</code></pre>
<p>You'll notice the <code>left</code>, <code>height</code>, and <code>width</code> properties utilize the CSS <code>calc</code> attributes – this just gives some much needed padding and visual clean-up to the whole tabbed interface.</p>
<p>For the finishing touches, we just need to tell the <code>.slide-item</code> where to position itself based on which <code>radio</code> input is currently selected:</p>
<pre><code>input[type="radio"]:nth-of-type(1):checked ~ .slide-item {
left: 4px;
}
input[type="radio"]:nth-of-type(3):checked ~ .slide-item {
left: calc(66.66% + 4px);
}
</code></pre>
<p>That's pretty much it! You now have a fully functional, animated toggle slider with just a set of simple <code>radio</code> inputs and pure CSS.</p>
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