Create a Piano Using JavaScript

                Create a Piano Using JavaScript

Welcome to Code With Random blog. In this blog, we’ll learn how we create a JavaScript Piano. We use HTML, CSS and JavaScript for this JavaScript Piano. Hope you enjoy our blog so let’s start with a basic HTML structure for a¬†¬†JavaScript Piano.





<section id="wrap">
<h1>JS Piano</h1>
<h2>Use your keyboard. Hover for hints.</h2>
<section id="main">
<div class="nowplaying"></div>
<div class="keys">
<div data-key="65" class="key" data-note="C">
<span class="hints">A</span>
<div data-key="87" class="key sharp" data-note="C#">
<span class="hints">W</span>
<div data-key="83" class="key" data-note="D">
<span class="hints">S</span>
<div data-key="69" class="key sharp" data-note="D#">
<span class="hints">E</span>
<div data-key="68" class="key" data-note="E">
<span class="hints">D</span>
<div data-key="70" class="key" data-note="F">
<span class="hints">F</span>
<div data-key="84" class="key sharp" data-note="F#">
<span class="hints">T</span>
<div data-key="71" class="key" data-note="G">
<span class="hints">G</span>
<div data-key="89" class="key sharp" data-note="G#">
<span class="hints">Y</span>
<div data-key="72" class="key" data-note="A">
<span class="hints">H</span>
<div data-key="85" class="key sharp" data-note="A#">
<span class="hints">U</span>
<div data-key="74" class="key" data-note="B">
<span class="hints">J</span>
<div data-key="75" class="key" data-note="C">
<span class="hints">K</span>
<div data-key="79" class="key sharp" data-note="C#">
<span class="hints">O</span>
<div data-key="76" class="key" data-note="D">
<span class="hints">L</span>
<div data-key="80" class="key sharp" data-note="D#">
<span class="hints">P</span>
<div data-key="186" class="key" data-note="E">
<span class="hints">;</span>
<audio data-key="65" src=""></audio>
<audio data-key="87" src=""></audio>
<audio data-key="83" src=""></audio>
<audio data-key="69" src=""></audio>
<audio data-key="68" src=""></audio>
<audio data-key="70" src=""></audio>
<audio data-key="84" src=""></audio>
<audio data-key="71" src=""></audio>
<audio data-key="89" src=""></audio>
<audio data-key="72" src=""></audio>
<audio data-key="85" src=""></audio>
<audio data-key="74" src=""></audio>
<audio data-key="75" src=""></audio>
<audio data-key="79" src=""></audio>
<audio data-key="76" src=""></audio>
<audio data-key="80" src=""></audio>
<audio data-key="186" src=""></audio>
<video playsinline autoplay muted loop id="bgvid" poster="">
<source src="" type="video/mp4">


There is all HTML code for the JavaScript Piano. Now, you can see output without CSS, then we write CSS & JavaScript for the JavaScript Piano.


CSS Code

html {
background: #000;
font-family: 'Noto Serif', serif;
-webkit-font-smoothing: antialiased;
text-align: center;
video#bgvid {
position: fixed;
top: 50%;
left: 50%;
min-width: 100%;
min-height: 100%;
width: auto;
height: auto;
z-index: -100;
transform: translateX(-50%) translateY(-50%);
background-size: cover;
header {
position: relative;
margin: 30px 0;
header:after {
content: '';
width: 460px;
height: 15px;
background: url(images/intro-div.svg) no-repeat center;
display: inline-block;
text-align: center;
background-size: 70%;
h1 {
color: #fff;
font-size: 50px;
font-weight: 400;
letter-spacing: 0.18em;
text-transform: uppercase;
margin: 0;
h2 {
color: #fff;
font-size: 24px;
font-style: italic;
font-weight: 400;
margin: 0 0 30px;
.nowplaying {
font-size: 120px;
line-height: 1;
color: #eee;
text-shadow: 0 0 5rem #028ae9;
transition: all .07s ease;
min-height: 120px;
.keys {
display: block;
width: 100%;
height: 350px;
max-width: 880px;
position: relative;
margin: 40px auto 0;
cursor: none;
.key {
position: relative;
border: 4px solid black;
border-radius: .5rem;
transition: all .07s ease;
display: block;
box-sizing: border-box;
z-index: 2;
.key:not(.sharp) {
float: left;
width: 10%;
height: 100%;
background: rgba(255, 255, 255, .8);
} {
position: absolute;
width: 6%;
height: 60%;
background: #000;
color: #eee;
top: 0;
z-index: 3;
.key[data-key="87"] {
left: 7%;
.key[data-key="69"] {
left: 17%;
.key[data-key="84"] {
left: 37%;
.key[data-key="89"] {
left: 47%;
.key[data-key="85"] {
left: 57%;
.key[data-key="79"] {
left: 77%;
.key[data-key="80"] {
left: 87%;
.playing {
transform: scale(.95);
border-color: #028ae9;
box-shadow: 0 0 1rem #028ae9;
.hints {
display: block;
width: 100%;
opacity: 0;
position: absolute;
bottom: 7px;
transition: opacity .3s ease-out;
font-size: 20px;
.keys:hover .hints {
opacity: 1;

Here is our updated output CSS.



JavaScript Code 

 const keys = document.querySelectorAll(".key"),
note = document.querySelector(".nowplaying"),
hints = document.querySelectorAll(".hints");
function playNote(e) {
const audio = document.querySelector(`audio[data-key="${e.keyCode}"]`),
key = document.querySelector(`.key[data-key="${e.keyCode}"]`);
if (!key) return;
const keyNote = key.getAttribute("data-note");
note.innerHTML = keyNote;
audio.currentTime = 0;;
function removeTransition(e) {
if (e.propertyName !== "transform") return;
function hintsOn(e, index) {
e.setAttribute("style", "transition-delay:" + index * 50 + "ms");
keys.forEach(key => key.addEventListener("transitionend", removeTransition));
window.addEventListener("keydown", playNote);


Final Output


Now we have completed our JavaScript section. Here is our updated output with JavaScript . Hope you like the JavaScript Piano. you can see output video and project Screenshot. See our other blogs and gain knowledge in front-end development.


In this post, we learn how to create a  JavaScript Piano using simple HTML & CSS and JavaScript . If we made a mistake or any confusion, please drop a comment to reply or help you in easy learning.

Thank you for Visit!!!

Written by – Code With Random/Anki

Codepen by – Caroline Gabriel





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