Learn how to convert a list into an array in JavaScript

β€” 5 minute read


🚨 Real-world use-case: I wanted to convert an excel list into an array; it had 200+ records, so a pain to do manually.

So why not create something easy in JavaScript!

The end goal is to have a textarea where we can input our list and auto-convert it into an array.

This is going to be the result in Codepen:

See the Pen Learn how to convert a list into an array in JavaScript by Chris Bongers (@rebelchris) on CodePen.

HTML Structure permalink

The HTML is going to be super easy for this, we just need a textarea and a paragraph to output our array.

<div class="container">
<textarea id="textarea">

<p id="array">["Paste","your ","list ","here"]</p>

CSS Styling permalink

Let's also add some super easy CSS to make it look good:

.container {
display: flex;
align-items: center;
justify-content: center;
height: 100vh;
flex-direction: column;
background: #3a86ff;
textarea {
padding: 10px;
min-width: 200px;
width: 50vw;
height: 100px;
margin-bottom: 10px;
border-radius: 10px;
#array {
background: #efefef;
border: 1px dashed #333;
padding: 10px;
width: 50vw;
min-width: 200px;
word-wrap: break-word;
margin-bottom: 10px;
color: #ff006e;
border-radius: 10px;

JavaScript convert a list into an array permalink

Ok, on to the magic part, let's convert our array input into an array.

We start by adding defining our variables

const textarea = document.getElementById('textarea');
const array = document.getElementById('array');

Now we can add our input listener to the textarea element

textarea.addEventListener('input', function() {
const arrayValues = textarea.value.split(/\n/g);
array.innerHTML = JSON.stringify(arrayValues);

And then for some magic we will add a click event to our paragraph which will auto select all text.

array.addEventListener('click', function() {
const range = document.createRange();
const selection = window.getSelection();

An awesome, simple tool, but effective!

Thank you for reading, and let's connect! permalink

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