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diff --git a/_posts/2019-07-30-dynamic-checkboxes.md b/_posts/2019-07-30-dynamic-checkboxes.md new file mode 100644 index 0000000..cb53ee4 --- /dev/null +++ b/_posts/2019-07-30-dynamic-checkboxes.md @@ -0,0 +1,414 @@ +--- +layout: post +title: "Dynamic Checkboxes" +date: 2019-07-30 +--- + + +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. + +What if we could make everyday checkboxes more beautiful *and* more intuitive? *It's easier than you think*. We only need a small amount of CSS and JavaScript to make considerable improvements to your average checkbox UX. + +Let's get into it. + +## What we are building +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. + +[Live CodePen Example](https://codepen.io/bradleytaunt/pen/rXWEpy/) + +## The Structure (HTML) + +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): + + + <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> + + +### The checkbox inputs & labels + + + <!-- #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>$49/mo</span> + + </label> + + +1. This input will be hidden via `position:absolute` by default. All checkbox inputs need to share the same `name` value and all checkboxes require their our custom `id` that will link with the corresponding `for` value on the label. + +2. This label needs it's `for` value to correspond with it's partnered checkbox. + - i) The first span holds the title and description information of the add-on + - ii) The last span holds the cost associated with the current add-on + +### The total cost container output + + + <!-- #1 --> + <div class="total-cost"> + + <h2>Your Plan</h2> + + <!-- #2 --> + <div> + + <!-- #2i --> + <span>$</span> + + <!-- #2ii --> + <span id="total-cost-inner">0</span> + + <!-- #2iii --> + <input id="output" type="text" value="0" disabled/> + + <!-- #2iv --> + <span>/mo</span> + + </div> + + </div> + + +1. A simple `div` with a class we can easily target later + +2. A `div` parent container is needed to house all the total `spans` together (more on this when we get into the CSS) + - i) The first `span` holds the static currency symbol + - ii) The second `span` is where our updated cost will be injected + - iii) This input field is required for us to take-in the `value` of the associated `:checked` inputs and add them together. This current value is then used for the injection into the second `span` + - iv) The final `span` simply holds the static monthly duration content + +All that's all we need for the HTML! + +## The Visuals (CSS) + +Again, lets take a look at the entire file before we break it down step-by-step: + + + .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; + } + } + + +### The checkbox label + + + /* + 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); + } + + +### The custom checkbox input + +We need to hide the browser's default checkbox input and replace it with our own using pseudo selectors. + + + /* 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; + } + + +### The total cost container + +We only need some very basic flexbox styling for our bottom "total" container: + + + .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; + } + + +### Last but not least - mobile + +Now we just ensure that on smaller devices our checkbox labels render nicely: + + + @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; + } + } + + +That's it for the styling! + +## The Function (JS) + +As you can see below, we only need a very minor amount of JavaScript to accomplish our total cost "injection". + + + 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; + } + + } + } + + +That's it! Feel free to play with the demo some more at the top of the post, or check out the [CodePen source directly](https://codepen.io/bradleytaunt/pen/rXWEpy). |