A program asks the user to give a decimal number and then the program will convert the given decimal number into an octal equivalent using JavaScript programming language.

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Program Listing
<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Convert Decimal to Octal Using JavaScript</title>
    <style>
        * {
            box-sizing: border-box;
            margin: 0;
            padding: 0;
        }
        body {
            background-color: #b1bfd8;
            background-image: linear-gradient(315deg, #b1bfd8 0%, #6782b4 74%);
            min-height: 100vh;
            display: flex;
            justify-content: center;
            align-items: center;
            font-family: sans-serif;
        }
        form {
            background: #ccc;
            padding: 30px;
            border-radius: 10px;
        }
        h1, h2 {
            text-align: center;
        }
        h1 {
            text-transform: uppercase;
            margin-bottom: 5px;
            font-size: 30px;
        }
        h2 {
            margin-bottom: 20px;
            color: #2196f3;
            font-size: 20px;
            font-weight: 400;
        }
        label,
        input,
        button {
            display: block;
            font-size: 14px;
            outline: none;
        }
        label {
            padding: 5px 0;
        }
        .btn-group {
            display: flex;
        }
        input {
            border: 1px solid #ccc;
            border-right: none;
            border-radius:  3px 0 0 3px;
            width: 100%;
            padding: 10px;
        }
        button {
            padding: 10px 14px;
            background-color: #4caf50;
            border: none;
            border-radius:  0 3px 3px 0;
            color: #fefefe;
            cursor: pointer;
        }
        .output {
            margin-top: 10px;
            background-color: #607d8b;
            padding: 15px;
            color: #fefefe;
            text-align: center;
            max-width: 330px;
            word-wrap: break-word;
            border-radius: 3px;
        }
        .hidden {
            display: none;
        }
    </style>
</head>
<body>
    <form action="" method="post">
        <h1>Convert<br>Decimal to Octal<br>Using JavaScript</h1>
        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>
        <label for="txtNumber">Enter a number to convert:</label>
        <div class="btn-group">
            <input type="number" name="txtNumber" id="txtNumber" autofocus required>
            <button type="submit">Convert</button>
        </div>
        <div class="output hidden"></div>
    </form>
    
    <script>
        document.querySelector('form').onsubmit  = (e) => {
            e.preventDefault()

            let number = parseInt(document.querySelector('#txtNumber').value),
                output = document.querySelector('.output')
            
            result = number.toString(8)
            output.classList.remove("hidden")
            output.innerHTML = 'Octal Value: ' + result
        }
    </script>
</body>
</html>

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