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<!doctype html>
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<head>
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	<meta name="viewport" content="width=device-width, initial-scale=1">
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	<title>Dynamic Checkboxes</title>
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<nav>
	<a href="#menu">Menu &darr;</a>
</nav>

<main>
<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&#8217;re selecting a pricing plan during a site&#8217;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&#8217;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&#8217;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 &#8220;bones&#8221; of the HTML structure for this checkbox form. Let&#8217;s take a look at the HTML in it&#8217;s entirety (don&#8217;t worry, it is a lot more simple than it seems at first glance):</p>

<pre><code>&#60;h2&#62;Add-ons&#60;&#47;h2&#62;

&#60;input class="checkbox-btn" name="checkbox-collection" id="checkbox-1" type="checkbox" value="49"&#62;
&#60;label class="checkbox-label" for="checkbox-1"&#62;
    &#60;span&#62;
        White-labeled Domain
        &#60;em&#62;Use your own custom domain with SSL security included.&#60;&#47;em&#62;
    &#60;&#47;span&#62;
    &#60;span&#62;$49&#47;mo&#60;&#47;span&#62;
&#60;&#47;label&#62;

&#60;input class="checkbox-btn" name="checkbox-collection" id="checkbox-2" type="checkbox" value="49"&#62;
&#60;label class="checkbox-label" for="checkbox-2"&#62;
    &#60;span&#62;
        API Access
        &#60;em&#62;Make API calls to perform custom serving and account actions.&#60;&#47;em&#62;
    &#60;&#47;span&#62;
    &#60;span&#62;$49&#47;mo&#60;&#47;span&#62;
&#60;&#47;label&#62;

&#60;input class="checkbox-btn" name="checkbox-collection" id="checkbox-3" type="checkbox" value="349"&#62;
&#60;label class="checkbox-label" for="checkbox-3"&#62;
    &#60;span&#62;
        Priority Support
        &#60;em&#62;A dedicated account manager to assist your team with ongoing deployments.&#60;&#47;em&#62;
    &#60;&#47;span&#62;
    &#60;span&#62;$349&#47;mo&#60;&#47;span&#62;
&#60;&#47;label&#62;

&#60;div class="total-cost"&#62;
    &#60;h2&#62;Your Plan&#60;&#47;h2&#62;
    &#60;div&#62;
        &#60;span&#62;$&#60;&#47;span&#62;
        &#60;span id="total-cost-inner"&#62;0&#60;&#47;span&#62;
        &#60;input id="output" type="text" value="0" disabled&#47;&#62;
        &#60;span&#62;&#47;mo&#60;&#47;span&#62;
    &#60;&#47;div&#62;
&#60;&#47;div&#62;
</code></pre>

<h3 id="the-checkbox-inputs-labels">The checkbox inputs &#38; labels</h3>

<pre><code>&#60;!-- #1 --&#62;
&#60;input class="checkbox-btn" name="checkbox-collection" id="checkbox-1" type="checkbox" value="49"&#62;

&#60;!-- #2 --&#62;
&#60;label class="checkbox-label" for="checkbox-1"&#62;

    &#60;!-- #2i --&#62;
    &#60;span&#62;
        White-labeled Domain
        &#60;em&#62;Use your own custom domain with SSL security included.&#60;&#47;em&#62;
    &#60;&#47;span&#62;

    &#60;!-- #2ii --&#62;
    &#60;span&#62;$49&#47;mo&#60;&#47;span&#62;

&#60;&#47;label&#62;
</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&#8217;s <code>for</code> value to correspond with it&#8217;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>&#60;!-- #1 --&#62;
&#60;div class="total-cost"&#62;

    &#60;h2&#62;Your Plan&#60;&#47;h2&#62;

    &#60;!-- #2 --&#62;
    &#60;div&#62;

        &#60;!-- #2i --&#62;
        &#60;span&#62;$&#60;&#47;span&#62;

        &#60;!-- #2ii --&#62;
        &#60;span id="total-cost-inner"&#62;0&#60;&#47;span&#62;

        &#60;!-- #2iii --&#62;
        &#60;input id="output" type="text" value="0" disabled&#47;&#62;

        &#60;!-- #2iv --&#62;
        &#60;span&#62;&#47;mo&#60;&#47;span&#62;

    &#60;&#47;div&#62;

&#60;&#47;div&#62;
</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&#8217;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:&#39;&#39;;
    height: 30px;
    left: 20px;
    position: absolute;
    top: calc(50% - 15px);
    transition: .3s ease background-color;
    width: 30px;
}
.checkbox-label:hover:before {
    background-image:
        url(&#39;data:image&#47;svg+xml;utf8,&#60;svg xmlns="http:&#47;&#47;www.w3.org&#47;2000&#47;svg" width="23.571429" height="23.571429" viewBox="0.000000 -47.142857 23.571429 23.571429"&#62;&#60;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"&#62;&#60;&#47;path&#62;&#60;&#47;svg&#62;&#39;);
}
.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(&#39;data:image&#47;svg+xml;utf8,&#60;svg xmlns="http:&#47;&#47;www.w3.org&#47;2000&#47;svg" width="25.948661" height="19.888393" viewBox="2.025670 -40.011161 25.948661 19.888393"&#62;&#60;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"&#62;&#60;&#47;path&#62;&#60;&#47;svg&#62;&#39;);
    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>&#47;*
This is the main element for each checkbox "container".
Inside it houses the title, description and price.
*&#47;
.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);
}

&#47;* Update the label styling when the input is :checked *&#47;
.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&#8217;s default checkbox input and replace it with our own using pseudo selectors.</p>

<pre><code>&#47;* Hide browser default input *&#47;
.checkbox-btn {
    position: absolute;
    visibility: hidden;
}

&#47;* Our custom input checkbox *&#47;
.checkbox-label:before {
    background-repeat: no-repeat;
    background-position: center;
    background-size: 15px;
    border: 1px solid lightgrey;
    border-radius: 50%;
    content:&#39;&#39;;
    height: 30px;
    left: 20px;
    position: absolute;
    top: calc(50% - 15px);
    transition: .3s ease background-color;
    width: 30px;
}

&#47;*
Here we add a simple &#39;+&#39; icon on hover
to our custom pseudo element.
Adding it as an inline SVG gives us the
ability to fully customize it&#39;s styling
*&#47;
.checkbox-label:hover:before {
    background-image:
        url(&#39;data:image&#47;svg+xml;utf8,&#60;svg xmlns="http:&#47;&#47;www.w3.org&#47;2000&#47;svg" width="23.571429" height="23.571429" viewBox="0.000000 -47.142857 23.571429 23.571429"&#62;&#60;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"&#62;&#60;&#47;path&#62;&#60;&#47;svg&#62;&#39;);
}

&#47;*
When the checkbox input is :checked we need to
update the inline SVG to use a checkmark symbol
*&#47;
.checkbox-btn:checked + .checkbox-label:before {
    background-color: mediumpurple;
    background-image:
        url(&#39;data:image&#47;svg+xml;utf8,&#60;svg xmlns="http:&#47;&#47;www.w3.org&#47;2000&#47;svg" width="25.948661" height="19.888393" viewBox="2.025670 -40.011161 25.948661 19.888393"&#62;&#60;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"&#62;&#60;&#47;path&#62;&#60;&#47;svg&#62;&#39;);
    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 &#8220;total&#8221; 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;
}

&#47;*
This input is used in our JavaScript - look at the
function part of this post to understand why
*&#47;
.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) {
    &#47;*
    Avoids the inner label content from squishing together
    and becoming unreadable
    *&#47;
    .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&#8217;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 &#8220;injection&#8221;.</p>

<pre><code>window.onload=function(){

&#47;&#47; Place the default browser checkbox inputs into a variable
var inputs = document.getElementsByClassName(&#39;checkbox-btn&#39;)

&#47;&#47; Now we loop through the inputs and check if they are
&#47;&#47; greater than zero. If so, we run our function.
for (var i=0; i &#60; inputs.length; i++) {

    inputs[i].onchange = function() {

        &#47;&#47; Create `add` variable which takes the :checked input value
        var add = this.value * (this.checked ? 1 : -1);

        &#47;&#47; We grab the current total value on our hidden input field and return it
        &#47;&#47; as a floating point number
        &#47;&#47; (since in this use case it will be a price number based on currency)
        var new_total = parseFloat(document.getElementById(&#39;output&#39;).value);

        &#47;&#47; Now we simply add the existing total value with the newly ":checked" input value
        var updated_total = document.getElementById(&#39;output&#39;).value=new_total + add

        &#47;&#47; Place the new updated total directly inside the `total-cost-inner` span element
        document.getElementById(&#39;total-cost-inner&#39;).innerHTML = updated_total;
    }

}
}
</code></pre>

<p>That&#8217;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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