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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>
/*
* I'm doing #JavaScript30 in September 2020
*
* This is my solution to lesson number 01.
*
* Mine is somewhat longer than Wes's solution.
*
* One difference is I've separated playing sounds and showing animations
* into separate functions.
* Another difference is I always choose to decouple event handlers
* from functionality.
*
* One more difference is I've delegated event handling to a parent,
* instead of setting handlers on child elements.
*
* I'm experimenting with semicolon-free style in this code.
*
* Michael J Salo
* 1 Sept 2020
*/
function playSound (keyCode) {
const audioElement = document.querySelector(`audio[data-key="${keyCode}"]`)
if (audioElement) {
highlightKey(keyCode)
audioElement.currentTime = 0
audioElement.play()
}
}
function highlightKey (keyCode) {
const keyElement = document.querySelector(`.key[data-key="${keyCode}"]`)
if (keyElement) {
keyElement.classList.add('playing')
}
}
function unhighlightKey (keyCode) {
const keyElement = document.querySelector(`.key[data-key="${keyCode}"]`)
if (keyElement) {
keyElement.classList.remove('playing')
}
}
function handleKey (event) {
const keyCode = event.keyCode
playSound(keyCode)
}
function handleClick (event) {
const keyElement = event.target.closest('.key')
if (keyElement) {
const keyCode = keyElement.dataset.key
playSound(keyCode)
}
}
function handleTransitionEnd (event) {
const keyElement = event.target.closest('.key')
if (keyElement) {
const keyCode = keyElement.dataset.key
unhighlightKey(keyCode)
}
}
function init () {
document.addEventListener('keydown', handleKey)
document.querySelector('.keys').addEventListener('click', handleClick)
document.querySelector('.keys').addEventListener('transitionend', handleTransitionEnd)
}
init()
</script>
</body>
</html>