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<!DOCTYPE html>
<html lang="en">
<head>
<meta charset="UTF-8">
<title>JS Drum Kit</title>
<link rel="stylesheet" href="style.css">
</head>
<body>
<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>
<audio data-key="65" src="sounds/clap.wav"></audio>
<audio data-key="83" src="sounds/hihat.wav"></audio>
<audio data-key="68" src="sounds/kick.wav"></audio>
<audio data-key="70" src="sounds/openhat.wav"></audio>
<audio data-key="71" src="sounds/boom.wav"></audio>
<audio data-key="72" src="sounds/ride.wav"></audio>
<audio data-key="74" src="sounds/snare.wav"></audio>
<audio data-key="75" src="sounds/tom.wav"></audio>
<audio data-key="76" src="sounds/tink.wav"></audio>
<script>
function playSound(e) {
// Get the <audio> element and <div.key> that matches our key
const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`);
const key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
if (!audio) return; // stop function from running if this isn't a hot key.
audio.currentTime = 0; // rewind audio to start, otherwise can't jam on the key!
audio.play();
key.classList.add('playing'); // add the class to grow / color border
}
// whenever a key is pressed, run playSound
window.addEventListener('keydown', playSound);
// Instead of using setTimeout or something, remove the transition
// effect by watching for transitions to end, then remove the class.
// I guess this also runs when we transition back, but then if it removes
// the class again, so what, it won't start a new transition anyway.
function removeTransition(e) {
if (e.propertyName !== 'transform') return; // skip if not a transform
// that is because a lot of stuff fires; many things transitioned,
// so many things fire on transitionend. But we only want to take
// action for one of them, and transform is the event we are watching
// here, ignoring the others.
this.classList.remove('playing'); // remove the class; button goes back to "unpressed"
// Here, 'this' is the key, because we are running this function from an event
// listener that was attached to a key (below, in the forEach)
}
const keys = document.querySelectorAll('.key');
// You have to use forEach here, to add event listener to each.
// Note keys is not an array, it is a NodeList, they are different things.
// Whenever a transitionend fires, run our function to take key back to normal.
keys.forEach(key => key.addEventListener('transitionend', removeTransition));
</script>
</body>
</html>