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<!doctype html>
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<title>Dynamic Checkboxes</title>
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<h1 id="dynamic-checkboxes">Dynamic Checkboxes</h1>
<p>2019-07-30</p>
<p>Checkboxes are used quite frequently on forms across the web. Whether you’re selecting a pricing plan during a site’s sign-up process or just simply selecting to opt-out from a newsletter, you have most likely interacted with some form of checkbox element.</p>
<p>What if we could make everyday checkboxes more beautiful <em>and</em> more intuitive? <em>It’s easier than you think</em>. We only need a small amount of CSS and JavaScript to make considerable improvements to your average checkbox UX.</p>
<p>Let’s get into it.</p>
<h2 id="what-we-are-building">What we are building</h2>
<p>Take a look and play around with the CodePen below to get an idea of what we are going to build. The premise is a simple add-on pricing form which calculates the additional monthly total to the user in real-time.</p>
<p><a href="https://codepen.io/bradleytaunt/pen/rXWEpy/">Live CodePen Example</a></p>
<h2 id="the-structure-html">The Structure (HTML)</h2>
<p>As always, we will start by breaking down the “bones” of the HTML structure for this checkbox form. Let’s take a look at the HTML in it’s entirety (don’t worry, it is a lot more simple than it seems at first glance):</p>
<pre><code><h2>Add-ons</h2>
<input class="checkbox-btn" name="checkbox-collection" id="checkbox-1" type="checkbox" value="49">
<label class="checkbox-label" for="checkbox-1">
<span>
White-labeled Domain
<em>Use your own custom domain with SSL security included.</em>
</span>
<span>$49/mo</span>
</label>
<input class="checkbox-btn" name="checkbox-collection" id="checkbox-2" type="checkbox" value="49">
<label class="checkbox-label" for="checkbox-2">
<span>
API Access
<em>Make API calls to perform custom serving and account actions.</em>
</span>
<span>$49/mo</span>
</label>
<input class="checkbox-btn" name="checkbox-collection" id="checkbox-3" type="checkbox" value="349">
<label class="checkbox-label" for="checkbox-3">
<span>
Priority Support
<em>A dedicated account manager to assist your team with ongoing deployments.</em>
</span>
<span>$349/mo</span>
</label>
<div class="total-cost">
<h2>Your Plan</h2>
<div>
<span>$</span>
<span id="total-cost-inner">0</span>
<input id="output" type="text" value="0" disabled/>
<span>/mo</span>
</div>
</div>
</code></pre>
<h3 id="the-checkbox-inputs-labels">The checkbox inputs & labels</h3>
<pre><code><!-- #1 -->
<input class="checkbox-btn" name="checkbox-collection" id="checkbox-1" type="checkbox" value="49">
<!-- #2 -->
<label class="checkbox-label" for="checkbox-1">
<!-- #2i -->
<span>
White-labeled Domain
<em>Use your own custom domain with SSL security included.</em>
</span>
<!-- #2ii -->
<span>$49/mo</span>
</label>
</code></pre>
<ol>
<li><p>This input will be hidden via <code>position:absolute</code> by default. All checkbox inputs need to share the same <code>name</code> value and all checkboxes require their our custom <code>id</code> that will link with the corresponding <code>for</code> value on the label.</p></li>
<li><p>This label needs it’s <code>for</code> value to correspond with it’s partnered checkbox.</p>
<ul>
<li>i) The first span holds the title and description information of the add-on</li>
<li>ii) The last span holds the cost associated with the current add-on</li>
</ul></li>
</ol>
<h3 id="the-total-cost-container-output">The total cost container output</h3>
<pre><code><!-- #1 -->
<div class="total-cost">
<h2>Your Plan</h2>
<!-- #2 -->
<div>
<!-- #2i -->
<span>$</span>
<!-- #2ii -->
<span id="total-cost-inner">0</span>
<!-- #2iii -->
<input id="output" type="text" value="0" disabled/>
<!-- #2iv -->
<span>/mo</span>
</div>
</div>
</code></pre>
<ol>
<li><p>A simple <code>div</code> with a class we can easily target later</p></li>
<li><p>A <code>div</code> parent container is needed to house all the total <code>spans</code> together (more on this when we get into the CSS)</p>
<ul>
<li>i) The first <code>span</code> holds the static currency symbol</li>
<li>ii) The second <code>span</code> is where our updated cost will be injected</li>
<li>iii) This input field is required for us to take-in the <code>value</code> of the associated <code>:checked</code> inputs and add them together. This current value is then used for the injection into the second <code>span</code></li>
<li>iv) The final <code>span</code> simply holds the static monthly duration content</li>
</ul></li>
</ol>
<p>All that’s all we need for the HTML!</p>
<h2 id="the-visuals-css">The Visuals (CSS)</h2>
<p>Again, lets take a look at the entire file before we break it down step-by-step:</p>
<pre><code>.checkbox-label {
align-items: center;
background-color: none;
border: 1px solid lightgrey;
border-radius: 5px;
cursor: pointer;
display: flex;
font-weight: 600;
justify-content: space-between;
margin: 0 auto 10px;
padding: 20px 20px 20px 70px;
position: relative;
transition: .3s ease all;
width: 100%;
}
.checkbox-label span:last-child {
padding: 0 0 0 20px;
}
.checkbox-label:hover {
background-color: rgba(255,255,255,0.2);
}
.checkbox-label:before {
background-repeat: no-repeat;
background-position: center;
background-size: 15px;
border: 1px solid lightgrey;
border-radius: 50%;
content:'';
height: 30px;
left: 20px;
position: absolute;
top: calc(50% - 15px);
transition: .3s ease background-color;
width: 30px;
}
.checkbox-label:hover:before {
background-image:
url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="23.571429" height="23.571429" viewBox="0.000000 -47.142857 23.571429 23.571429"><path fill="lightgrey" d="M23.571429 -36.964286L23.571429 -33.750000C23.571429 -33.303571 23.415179 -32.924107 23.102679 -32.611607C22.790179 -32.299107 22.410714 -32.142857 21.964286 -32.142857L15.000000 -32.142857L15.000000 -25.178571C15.000000 -24.732143 14.843750 -24.352679 14.531250 -24.040179C14.218750 -23.727679 13.839286 -23.571429 13.392857 -23.571429L10.178571 -23.571429C9.732143 -23.571429 9.352679 -23.727679 9.040179 -24.040179C8.727679 -24.352679 8.571429 -24.732143 8.571429 -25.178571L8.571429 -32.142857L1.607143 -32.142857C1.160714 -32.142857 0.781250 -32.299107 0.468750 -32.611607C0.156250 -32.924107 0.000000 -33.303571 0.000000 -33.750000L0.000000 -36.964286C0.000000 -37.410714 0.156250 -37.790179 0.468750 -38.102679C0.781250 -38.415179 1.160714 -38.571429 1.607143 -38.571429L8.571429 -38.571429L8.571429 -45.535714C8.571429 -45.982143 8.727679 -46.361607 9.040179 -46.674107C9.352679 -46.986607 9.732143 -47.142857 10.178571 -47.142857L13.392857 -47.142857C13.839286 -47.142857 14.218750 -46.986607 14.531250 -46.674107C14.843750 -46.361607 15.000000 -45.982143 15.000000 -45.535714L15.000000 -38.571429L21.964286 -38.571429C22.410714 -38.571429 22.790179 -38.415179 23.102679 -38.102679C23.415179 -37.790179 23.571429 -37.410714 23.571429 -36.964286ZM23.571429 -36.964286"></path></svg>');
}
.checkbox-label span {
-webkit-user-select: none;
-moz-user-select: none;
user-select: none;
}
.checkbox-label span em {
display: block;
font-size: 80%;
font-style: normal;
font-weight: 400;
line-height: 1.2;
}
.checkbox-btn {
position: absolute;
visibility: hidden;
}
.checkbox-btn:checked + .checkbox-label {
background-color: white;
border-color: mediumpurple;
box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
.checkbox-btn:checked + .checkbox-label:before {
background-color: mediumpurple;
background-image:
url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="25.948661" height="19.888393" viewBox="2.025670 -40.011161 25.948661 19.888393"><path fill="white" d="M27.974330 -36.127232C27.974330 -35.680804 27.818080 -35.301339 27.505580 -34.988839L15.385045 -22.868304L13.108259 -20.591518C12.795759 -20.279018 12.416295 -20.122768 11.969866 -20.122768C11.523438 -20.122768 11.143973 -20.279018 10.831473 -20.591518L8.554688 -22.868304L2.494420 -28.928571C2.181920 -29.241071 2.025670 -29.620536 2.025670 -30.066964C2.025670 -30.513393 2.181920 -30.892857 2.494420 -31.205357L4.771205 -33.482143C5.083705 -33.794643 5.463170 -33.950893 5.909598 -33.950893C6.356027 -33.950893 6.735491 -33.794643 7.047991 -33.482143L11.969866 -28.543527L22.952009 -39.542411C23.264509 -39.854911 23.643973 -40.011161 24.090402 -40.011161C24.536830 -40.011161 24.916295 -39.854911 25.228795 -39.542411L27.505580 -37.265625C27.818080 -36.953125 27.974330 -36.573661 27.974330 -36.127232ZM27.974330 -36.127232"></path></svg>');
border-color: mediumpurple;
}
.total-cost {
align-items: baseline;
border-top: 1px solid lightgrey;
display: flex;
justify-content: space-between;
margin-top: 40px;
padding: 40px 20px 0;
}
.total-cost div {
align-items: baseline;
display: flex;
}
.total-cost span:nth-child(1) {
align-self: flex-start;
padding-top: 5px;
}
.total-cost span:nth-child(2) {
font-size: 32px;
font-weight: bold;
}
.total-cost input {
display: none;
}
@media(max-width:480px) {
.checkbox-label {
align-items: flex-start;
flex-direction: column;
flex-wrap: wrap;
}
.checkbox-label span:last-child {
padding: 10px 0 0 0;
}
}
</code></pre>
<h3 id="the-checkbox-label">The checkbox label</h3>
<pre><code>/*
This is the main element for each checkbox "container".
Inside it houses the title, description and price.
*/
.checkbox-label {
align-items: center;
background-color: none;
border: 1px solid lightgrey;
border-radius: 5px;
cursor: pointer;
display: flex;
font-weight: 600;
justify-content: space-between;
margin: 0 auto 10px;
padding: 20px 20px 20px 70px;
position: relative;
transition: .3s ease all;
width: 100%;
}
.checkbox-label:hover {
background-color: rgba(255,255,255,0.2);
}
/* Update the label styling when the input is :checked */
.checkbox-btn:checked + .checkbox-label {
background-color: white;
border-color: mediumpurple;
box-shadow: 0 2px 4px rgba(0,0,0,0.05);
}
</code></pre>
<h3 id="the-custom-checkbox-input">The custom checkbox input</h3>
<p>We need to hide the browser’s default checkbox input and replace it with our own using pseudo selectors.</p>
<pre><code>/* Hide browser default input */
.checkbox-btn {
position: absolute;
visibility: hidden;
}
/* Our custom input checkbox */
.checkbox-label:before {
background-repeat: no-repeat;
background-position: center;
background-size: 15px;
border: 1px solid lightgrey;
border-radius: 50%;
content:'';
height: 30px;
left: 20px;
position: absolute;
top: calc(50% - 15px);
transition: .3s ease background-color;
width: 30px;
}
/*
Here we add a simple '+' icon on hover
to our custom pseudo element.
Adding it as an inline SVG gives us the
ability to fully customize it's styling
*/
.checkbox-label:hover:before {
background-image:
url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="23.571429" height="23.571429" viewBox="0.000000 -47.142857 23.571429 23.571429"><path fill="lightgrey" d="M23.571429 -36.964286L23.571429 -33.750000C23.571429 -33.303571 23.415179 -32.924107 23.102679 -32.611607C22.790179 -32.299107 22.410714 -32.142857 21.964286 -32.142857L15.000000 -32.142857L15.000000 -25.178571C15.000000 -24.732143 14.843750 -24.352679 14.531250 -24.040179C14.218750 -23.727679 13.839286 -23.571429 13.392857 -23.571429L10.178571 -23.571429C9.732143 -23.571429 9.352679 -23.727679 9.040179 -24.040179C8.727679 -24.352679 8.571429 -24.732143 8.571429 -25.178571L8.571429 -32.142857L1.607143 -32.142857C1.160714 -32.142857 0.781250 -32.299107 0.468750 -32.611607C0.156250 -32.924107 0.000000 -33.303571 0.000000 -33.750000L0.000000 -36.964286C0.000000 -37.410714 0.156250 -37.790179 0.468750 -38.102679C0.781250 -38.415179 1.160714 -38.571429 1.607143 -38.571429L8.571429 -38.571429L8.571429 -45.535714C8.571429 -45.982143 8.727679 -46.361607 9.040179 -46.674107C9.352679 -46.986607 9.732143 -47.142857 10.178571 -47.142857L13.392857 -47.142857C13.839286 -47.142857 14.218750 -46.986607 14.531250 -46.674107C14.843750 -46.361607 15.000000 -45.982143 15.000000 -45.535714L15.000000 -38.571429L21.964286 -38.571429C22.410714 -38.571429 22.790179 -38.415179 23.102679 -38.102679C23.415179 -37.790179 23.571429 -37.410714 23.571429 -36.964286ZM23.571429 -36.964286"></path></svg>');
}
/*
When the checkbox input is :checked we need to
update the inline SVG to use a checkmark symbol
*/
.checkbox-btn:checked + .checkbox-label:before {
background-color: mediumpurple;
background-image:
url('data:image/svg+xml;utf8,<svg xmlns="http://www.w3.org/2000/svg" width="25.948661" height="19.888393" viewBox="2.025670 -40.011161 25.948661 19.888393"><path fill="white" d="M27.974330 -36.127232C27.974330 -35.680804 27.818080 -35.301339 27.505580 -34.988839L15.385045 -22.868304L13.108259 -20.591518C12.795759 -20.279018 12.416295 -20.122768 11.969866 -20.122768C11.523438 -20.122768 11.143973 -20.279018 10.831473 -20.591518L8.554688 -22.868304L2.494420 -28.928571C2.181920 -29.241071 2.025670 -29.620536 2.025670 -30.066964C2.025670 -30.513393 2.181920 -30.892857 2.494420 -31.205357L4.771205 -33.482143C5.083705 -33.794643 5.463170 -33.950893 5.909598 -33.950893C6.356027 -33.950893 6.735491 -33.794643 7.047991 -33.482143L11.969866 -28.543527L22.952009 -39.542411C23.264509 -39.854911 23.643973 -40.011161 24.090402 -40.011161C24.536830 -40.011161 24.916295 -39.854911 25.228795 -39.542411L27.505580 -37.265625C27.818080 -36.953125 27.974330 -36.573661 27.974330 -36.127232ZM27.974330 -36.127232"></path></svg>');
border-color: mediumpurple;
}
</code></pre>
<h3 id="the-total-cost-container">The total cost container</h3>
<p>We only need some very basic flexbox styling for our bottom “total” container:</p>
<pre><code>.total-cost {
align-items: baseline;
border-top: 1px solid lightgrey;
display: flex;
justify-content: space-between;
margin-top: 40px;
padding: 40px 20px 0;
}
.total-cost div {
align-items: baseline;
display: flex;
}
.total-cost span:nth-child(1) {
align-self: flex-start;
padding-top: 5px;
}
.total-cost span:nth-child(2) {
font-size: 32px;
font-weight: bold;
}
/*
This input is used in our JavaScript - look at the
function part of this post to understand why
*/
.total-cost input {
display: none;
}
</code></pre>
<h3 id="last-but-not-least---mobile">Last but not least - mobile</h3>
<p>Now we just ensure that on smaller devices our checkbox labels render nicely:</p>
<pre><code>@media(max-width:480px) {
/*
Avoids the inner label content from squishing together
and becoming unreadable
*/
.checkbox-label {
align-items: flex-start;
flex-direction: column;
flex-wrap: wrap;
}
.checkbox-label span:last-child {
padding: 10px 0 0 0;
}
}
</code></pre>
<p>That’s it for the styling!</p>
<h2 id="the-function-js">The Function (JS)</h2>
<p>As you can see below, we only need a very minor amount of JavaScript to accomplish our total cost “injection”.</p>
<pre><code>window.onload=function(){
// Place the default browser checkbox inputs into a variable
var inputs = document.getElementsByClassName('checkbox-btn')
// Now we loop through the inputs and check if they are
// greater than zero. If so, we run our function.
for (var i=0; i < inputs.length; i++) {
inputs[i].onchange = function() {
// Create `add` variable which takes the :checked input value
var add = this.value * (this.checked ? 1 : -1);
// We grab the current total value on our hidden input field and return it
// as a floating point number
// (since in this use case it will be a price number based on currency)
var new_total = parseFloat(document.getElementById('output').value);
// Now we simply add the existing total value with the newly ":checked" input value
var updated_total = document.getElementById('output').value=new_total + add
// Place the new updated total directly inside the `total-cost-inner` span element
document.getElementById('total-cost-inner').innerHTML = updated_total;
}
}
}
</code></pre>
<p>That’s it! Feel free to play with the demo some more at the top of the post, or check out the <a href="https://codepen.io/bradleytaunt/pen/rXWEpy">CodePen source directly</a>.</p>
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