Box-shadow live visualize

by Julien Roche

HTML

<body class="main">
  <section class="main__visualizer">
    <div class="main__visualizer__rect"></div>
  </section>
  <footer class="main__editor">
    <label>
      <span>Offset X</span>
      <input type="range" min="0" max="250" value="10" step="1" name="offsetX" />
    </label>
    <label>
      <span>Offset Y</span>
      <input type="range" min="0" max="250" value="10" step="1" name="offsetY" />
    </label>
    <label>
      <span>Blur radius</span>
      <input type="range" min="0" max="50" value="0" step="1" name="blurRadius" />
    </label>
    <label>
      <span>Spread radius</span>
      <input type="range" min="0" max="50" value="0" step="1" name="spreadRadius" />
    </label>
    <label>
      <span>Inset</span>
      <input type="checkbox" value="inset" name="inset" />
    </label>
    <br />
    <br />
    <output name="cssConfiguration"></output>
  </footer>
</body>

CSS

html,
body {
  border: none;
  height: 100%;
  margin: 0 0 0 0;
  padding: 0 0 0 0;
  width: 100%;
}

:root {
  --offsetX: 10px;
  --offsetY: 10px;
  --blurRadius: 0px;
  --spreadRadius: 0px;
}

.main {
  background-color: white;
  display: flex;
  flex-direction: column;
}

.main__visualizer {
  align-items: center;
  display: flex;
  flex: 1 1 auto;
  justify-content: center;
  margin-bottom: 1rem;
}

.main__visualizer__rect {
  border: 1px solid black;
  box-shadow: var(--offsetX) var(--offsetY) var(--blurRadius) var(--spreadRadius) red;
  height: 5rem;
  width: 20rem;
}

.inset .main__visualizer__rect {
  box-shadow: inset var(--offsetX) var(--offsetY) var(--blurRadius) var(--spreadRadius) red;
}

.main__editor {
  border-top: 1px solid black;
  flex: 0 0 150px;
  margin-top: 1rem;
}

Babel + JSX

// https://developer.mozilla.org/en-US/docs/Web/CSS/box-shadow
let cssConfigurationOutputElement = document.querySelector('[name="cssConfiguration"');
let sampleElement = document.querySelector('.main__visualizer__text');

document.addEventListener('input', event => {
	let inputName = event.target.name;
  document.documentElement.style.setProperty(`--${inputName}`, `${event.target.value}px`);
  updateCssConfigurationOutput();
}, false);

document.addEventListener('change', event => {
	let inputName = event.target.name;
  let inputType = event.target.type;
  
  if (inputType === 'checkbox') {
  	event.target.checked ? document.body.classList.add(inputName) : document.body.classList.remove(inputName);
  }
  
  updateCssConfigurationOutput();
}, false);

function updateCssConfigurationOutput() {
	cssConfigurationOutputElement.value = `text-shadow: ${window.getComputedStyle(sampleElement)['text-shadow']}`;
}

updateCssConfigurationOutput();