Having trouble with playing audio from an array in Javascript

I've been working on creating a Drum Kit website. My approach involves using an array to hold all the sound files, and using a loop to call the play() function. However, I encountered an issue when trying to load the sounds - the debug console showed: "Uncaught DOMException DOMException: Failed to load because no supported source was found."

The strange thing is that when I replace "audio.src = playlist[i];" with "audio.src = playlist[1];", the website successfully locates the file source and plays the selected sound. But if I change [1] to [i], it fails to locate the source file. Why does this happen?

Have you experienced a similar behavior in JavaScript before? While I can find alternative ways to make the website function correctly, this particular problem has been lingering in my mind.

Below are snippets of my Javascript code:


var audio = new Audio();
var playlist = ["sounds/crash.mp3","sounds/kick-bass.mp3","sounds/snare.mp3","sounds/tom-1.mp3","sounds/tom-2.mp3","sounds/tom-3.mp3","sounds/tom-4.mp3"];
var drum = document.querySelectorAll(".drum")

for (var i = 0; i < drum.length; i++) {
    drum[i].addEventListener("click", play);
    
    function play() {
        audio.src = playlist[i];
        audio.play();       
    }
}

Below is part of the HTML structure:


<body>
  <h1 id="title">Drum 🥁 Kit</h1>
  <div class="set">
    <button class="w drum">w</button>
    <button class="a drum">a</button>
    <button class="s drum">s</button>
    <button class="d drum">d</button>
    <button class="j drum">j</button>
    <button class="k drum">k</button>
    <button class="l drum">l</button>
  </div>
 
  <script src="index.js"></script>
</body>

Answer №1

It's challenging to determine without the HTML provided, but it appears that there is a discrepancy between the number of elements returned by

document.querySelectorAll(".drum")
and the items in the playlist. This results in depleting the items in the playlist, leading to assigning an undefined value to audio.src.

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