JSFiddle - React, Tailwind, and code Playground

by Chuan Shao

HTML

<div class="keys">
    <div data-key="65" class="key">
      <kbd>A</kbd>
      <span class="sound">clap</span>
    </div>
    <div data-key="83" class="key">
      <kbd>S</kbd>
      <span class="sound">hihat</span>
    </div>
    <div data-key="68" class="key">
      <kbd>D</kbd>
      <span class="sound">kick</span>
    </div>
    <div data-key="70" class="key">
      <kbd>F</kbd>
      <span class="sound">openhat</span>
    </div>
    <div data-key="71" class="key">
      <kbd>G</kbd>
      <span class="sound">boom</span>
    </div>
    <div data-key="72" class="key">
      <kbd>H</kbd>
      <span class="sound">ride</span>
    </div>
    <div data-key="74" class="key">
      <kbd>J</kbd>
      <span class="sound">snare</span>
    </div>
    <div data-key="75" class="key">
      <kbd>K</kbd>
      <span class="sound">tom</span>
    </div>
    <div data-key="76" class="key">
      <kbd>L</kbd>
      <span class="sound">tink</span>
    </div>
  </div>

CSS

html {
  font-size: 10px;
  background: url(http://i.imgur.com/b9r5sEL.jpg) bottom center;
  background-size: cover;
}
body,html {
  margin: 0;
  padding: 0;
  font-family: sans-serif;
}

.keys {
  display: flex;
  flex: 1;
  min-height: 100vh;
  align-items: center;
  justify-content: center;
}

.key {
  border: .4rem solid black;
  border-radius: .5rem;
  margin: 1rem;
  font-size: 1.5rem;
  padding: 1rem .5rem;
  transition: all .07s ease;
  width: 10rem;
  text-align: center;
  color: white;
  background: rgba(0,0,0,0.4);
  text-shadow: 0 0 .5rem black;
}

.playing {
  transform: scale(1.1);
  border-color: #ffc600;
  box-shadow: 0 0 1rem #ffc600;
}

kbd {
  display: block;
  font-size: 4rem;
}

.sound {
  font-size: 1.2rem;
  text-transform: uppercase;
  letter-spacing: .1rem;
  color: #ffc600;
}

JavaScript

var keysUnderTransition = {
  "65": 0,
  "83": 0,
  "68": 0,
  "70": 0,
  "71": 0,
  "72": 0,
  "74": 0,
  "75": 0,
  "76": 0
};

	function playSound(e)
	{

    if (keysUnderTransition[e.keyCode]) {
      return;
    }
    keysUnderTransition[e.keyCode] = 2;

		//const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
		const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
		// if(!audio)
		// {
		// 	return;
		// }
		if(key.classList.contains("playing"))
		{
			console.log("True");
			key.classList.remove("playing");
		}
		//audio.currentTime = 0;
		//audio.play();
		console.log("adding");
		key.classList.add("playing");
	}

	function removeTransition(e)
	{
		if(e.propertyName === "transform")
		{

      var dataKey = this.getAttribute('data-key');
      var underTransitionVal = keysUnderTransition[dataKey];
      if (underTransitionVal === 2) {
        setTimeout(function() {
          keysUnderTransition[dataKey] = 1;
        }, 50);
      } else if (underTransitionVal === 1) {
        keysUnderTransition[dataKey] = 0;
      }

			this.classList.remove("playing");
			if(this.classList.contains("playing"))
			{
				console.log("works");
				this.classList.remove("playing");
			}
			console.log(e);
		}
	}

	const keys = document.querySelectorAll('.key');
	keys.forEach(key => key.addEventListener('transitionend', removeTransition));
	window.addEventListener('keydown', playSound);