Wednesday, April 13, 2022

Simple Yearly Interest Calculator in JavaScript

 A simple yearly interest calculator is written in JavaScript to solve the loan of the customer.

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Program Listing


index.htm


<!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>SIMPLE YEARLY INTEREST CALCULATOR</title>

    <style>

        * {

            box-sizing: border-box;

            margin: 0;

            padding: 0;

        }

        body {

            min-height: 100vh;

            display: flex;

            justify-content: center;

            align-items: center;

            background-color: #7A819F;

            color: #2B2E3E;

            font-family: sans-serif;

        }

        main {

            padding: 50px;

            border-radius: 10px;

            background-color: #D9D4D0;

            min-width: 500px;

        }

        h1 {

            margin-bottom: 5px;

            font-size: 28px;

            text-align: center;

        }

        h2 {

            margin-bottom: 30px;

            font-size: 20px;

            text-align: center;

        }

        .block {

            margin: 0 auto 12px;

            display: flex;

            align-items: center;


        }

        label {

            display: block;

            width: 35%;

            line-height: 40px;

            background-color: #47356E;

            color: #eee;

            text-align: center;

        }

        input {

            padding: 10px;

            width: 65%;

            font-size: 14px;

            border-radius: 0 5px 5px 0;

            border: 2px solid #000;

            outline: none;

        }

        .btnBlock {

            display: flex;

            width: 100%;

        }

        .btn {

            display: inline-block;

            padding: 15px;

            background-color: #CD8F3C;

            color: #fff;

            outline: none; 

            border: none;

            cursor: pointer;

            width: 150px;

            width: 50%;

            font-size: 16px;

            text-decoration: none;

            text-align: center;

            transition: all .2s;

        }

        .btnReset {

            background-color: #6B838E;

        }

        .btn:hover {

            opacity: 0.9;

        }

        .total {

            display: block;

            width: 100%;

            margin-top: 12px;

            padding: 20px 0;

            background-color: #2F4C58;

            font-size: 16px;

            text-align:center;

            color: #f3f3f3;

            line-height: 1.5;

        }

        .hide {

            display: none;

        }

    </style>

</head>

<body>

    <main class="container">

        <h1>SIMPLE YEARLY INTEREST<br>CALCULATOR</h1>

        <h2>Jake R. Pomperada, MAED-IT, MIT</h2>

        <form action="" id="frmCalc">

            <div class="block">

                <label for="grade1">Principal Amount:</label>

                <input type="number" min="1" id="principal" autofocus required>

            </div>

            <div class="block">

                <label for="grade2">Interest Rate (%):</label>

                <input type="number" min="0" max="100" id="rate" required>

            </div>

            <div class="block">

                <label for="grade3">Time in years:</label>

                <input type="number" id="time" required>

            </div>

            <div class="btnBlock">

                <button type="submit" class="btn">CALCULATE</button>

                <a href="" class="btn btnReset">RESET</a>

            </div>

            <div class="total hide"></div>

        </form>

    </main>


    <script>

        document.querySelector('#frmCalc').onsubmit  = (e) => {

            e.preventDefault()

            let total = document.querySelector('.total'),

                interest = document.querySelector('.interest'),

                inputs = document.querySelectorAll('input[type="number"]'),

                calc = 1,

                monthly = 0;

                

            calc = (inputs[0].value * inputs[1].value)/100;

            totalAmount = parseInt(inputs[0].value) + parseInt(calc);

            monthly = totalAmount/(inputs[2].value * 12);

      

            total.classList.remove('hide')

            total.innerHTML = 'Total Amount is: '+totalAmount.toFixed(2)+'<br>'+

                            'Monthly Payment is: '+monthly.toFixed(2)+'<br>'+

                            'Total Interest is: '+calc.toFixed(2)

        }

    </script>

</body>

</html>

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