index.js

//Detecting Button Press

var drumSet = document.querySelectorAll(".drum");

for (let i = 0; i<drumSet.length; i++) {

    drumSet[i].addEventListener("click" , function () {

        var buttonInnerHTML = this.innerHTML;
        makeSound(buttonInnerHTML);
        buttonAnimation(buttonInnerHTML);

    });
}


// Detecting Keyboard Press

document.addEventListener("keydown", function (event) {
    makeSound(event.key);
    buttonAnimation(event.key);
    
});


//The Sound function that is called both at Button & Keyboard Press

function makeSound(key) {
    switch (key) {
        case "w":
            var tom1 = new Audio("./sounds/tom-1.mp3");
            tom1.play();
            break;
        
        case "a":
            var tom2 = new Audio("./sounds/tom-2.mp3");
            tom2.play();
            break;
        
        case "s":
            var tom3 = new Audio("./sounds/tom-3.mp3");
            tom3.play();
            break;

        case "d":
            var tom4 = new Audio("./sounds/tom-4.mp3");
            tom4.play();
            break;
        
        case "j":
            var crash = new Audio("./sounds/crash.mp3");
            crash.play();
            break;

        case "k":
            var kick = new Audio("./sounds/kick-bass.mp3");
            kick.play();
            break;

        case "l":
            var snare = new Audio("./sounds/snare.mp3");
            snare.play();
            break;

        default: 
            console.log(buttonInnerHTML);
            break;
    }    
}


//The Animation function that gets called at button & keyboard presses

function buttonAnimation (currentKey) {

  var activeButton =  document.querySelector("." + currentKey);

  activeButton.classList.add("pressed");

  setTimeout(function () {
    activeButton.classList.remove("pressed");
  }, 100);

}