How to Read Text File in Javascript Line By Line

In this video tutorial, you will learn how to read text file in javascript line by line.

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Source Code:

HTML:


<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <link rel="stylesheet" href="style.css">
</head>
<body>
    
    <div>
        <input type="file">
        <textarea cols="30" rows="20"></textarea>
    </div>
    
    <script src="script.js"></script>
</body>
</html>

CSS:


div {
    display: flex;
    flex-direction: column;
    align-items: center;
}
 
textarea {
    margin-top: 15px;
    width: 50%;
}

Javascript:


let input = document.querySelector('input');
let textarea = document.querySelector('textarea');
 
input.addEventListener('change', () => {
    let files = input.files;
 
    if(files.length == 0) return;
 
    const file = files[0];
 
    let reader = new FileReader();
 
    reader.onload = (e) => {
        const file = e.target.result;
        const lines = file.split(/\r\n|\n/);
        textarea.value = lines.join('\n');
    };
 
    reader.onerror = (e) => alert(e.target.error.name);
 
    reader.readAsText(file); 
    
});

#javascript