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134 lines (116 loc) · 2.45 KB
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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>
<script>
// Data
const AUDIO_DIR = 'sounds/';
const KEYS = [
{
code: 65,
label: 'A',
name: 'clap',
audioSrc: 'clap.wav'
},
{
code: 83,
label: 'S',
name: 'hihat',
audioSrc: 'hihat.wav'
},
{
code: 68,
label: 'D',
name: 'kick',
audioSrc: 'kick.wav'
},
{
code: 70,
label: 'F',
name: 'openhat',
audioSrc: 'openhat.wav'
},
{
code: 71,
label: 'G',
name: 'boom',
audioSrc: 'boom.wav'
},
{
code: 72,
label: 'H',
name: 'ride',
audioSrc: 'ride.wav'
},
{
code: 74,
label: 'J',
name: 'snare',
audioSrc: 'snare.wav'
},
{
code: 75,
label: 'K',
name: 'tom',
audioSrc: 'tom.wav'
},
{
code: 76,
label: 'L',
name: 'tink',
audioSrc: 'tink.wav'
}
];
// Add keys to DOM
let keyboard = document.querySelector('.keys');
let htmlString = '';
for (let key of KEYS) {
htmlString += `<div data-key="${key.code}" class="key">
<kbd>${key.label}</kbd>
<span class="sound">${key.name}</span>
<audio data-key="${key.code}" preload="auto" src="${AUDIO_DIR}${key.audioSrc}"></audio>
</div>`;
}
keyboard.innerHTML = htmlString;
function triggerDrumByKeyCode(keyCode) {
let key = document.querySelector(`.key[data-key="${keyCode}"]`);
let audio = document.querySelector(`audio[data-key="${keyCode}"]`);
if (!key || !audio) {
return;
}
playAudio(audio);
activateKey(key);
}
function playAudio(audio) {
if (audio.played.length > 0) {
audio.currentTime = 0;
}
audio.play();
}
function activateKey(key) {
key.classList.add('playing');
key.addEventListener('transitionend', toggleKeyClass, { once: true });
}
function toggleKeyClass() {
this.classList.toggle('playing')
}
function onKeyClick() {
triggerDrumByKeyCode(this.dataset.key);
}
function onKeyDown(event) {
triggerDrumByKeyCode(event.keyCode);
}
let keys = document.querySelectorAll('.key');
Array.from(keys).forEach(key => {
key.addEventListener('click', onKeyClick, true)
});
window.addEventListener('keydown', onKeyDown);
</script>
</body>
</html>