BMI Calculator

Overview

This app allow user to calculate BMI and also provide the result with the description based on the standard value.

HTML File

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>| BMI Calculator |</title>
    <link rel="stylesheet" href="./style.css">
</head>
<body class="grid">
    <div class="container">
        <h1>BMI Calculator</h1>
        <div class="input-group">
            <div class="input-wrapper">
                <input type="text" class="input" id="weight" placeholder="e.g., 70.5">
                <div class="tooltip">Please provide the weight in kg</div>
            </div>
            <div class="input-wrapper">
                <input type="text" class="input" id="height" placeholder="e.g., 5.9">
                <div class="tooltip">Please provide the height in ft</div>
            </div>
        </div>
        <button id="calculate-btn"><span>Calculate</span></button>
        <div class="result-container">
            <div id="bmi-result" class="bmi-result"></div>
            <div id="bmi-description"></div>
        </div>
    </div>
    <script src="./script.js"></script>
</body>
</html>

CSS File

body {
    background-color: #000000;
    color: #f9f9f9;
    font-family: "Calibri", sans-serif;
    display: flex;
    align-items: center;
    justify-content: center;
    height: 100vh;
    margin: 0;
    overflow: hidden;
}

.grid {
    background-image: linear-gradient(to right, #0f0f10 1px, transparent 1px),
                      linear-gradient(to bottom, #0f0f10 1px, transparent 1px);
    background-size: 2rem 2rem;
    background-position: center center;
    animation: bgMove 10s linear infinite;
}

@keyframes bgMove {
    0% { background-position: center center; }
    100% { background-position: right bottom; }
}

.container {
    text-align: center;
    max-width: 400px;
    width: 90%;
    padding: 20px;
    background-color: #151515;
    border-radius: 12px;
    box-shadow: 0 0 15px rgba(0, 0, 0, 0.6);
    z-index: 1;
    position: relative;
}

h1 {
    margin-bottom: 20px;
    font-size: 28px;
    background-image: linear-gradient(to right, #541bbe, #0b9d74);
    -webkit-background-clip: text;
    background-clip: text;
    color: transparent;
    font-weight: bold;
}

.input-group {
    margin-bottom: 20px;
}

.input-wrapper {
    position: relative;
    margin-bottom: 15px;
}

.input {
    background-color: #010201;
    border: 2px solid #343434;
    width: 100%;
    height: 50px;
    border-radius: 10px;
    color: white;
    padding: 0 20px;
    font-size: 18px;
    box-sizing: border-box;
    transition: border-color 0.3s ease;
}

.input:focus {
    border-color: #d55e08;
    outline: none;
}

.input::placeholder {
    color: #c0b0c0;
}

.tooltip {
    position: absolute;
    top: -150%;
    left: 50%;
    transform: translateX(-50%);
    opacity: 0;
    padding: 0.3rem 0.6rem;
    pointer-events: none;
    transition: all 0.3s ease;
    background: #333333;
    z-index: 1;
    border-radius: 6px;
    font-size: 0.8rem;
    color: #e8e8e8;
    white-space: nowrap;
    transform-origin: top center;
}

.tooltip::before {
    position: absolute;
    content: "";
    height: 0.6rem;
    width: 0.6rem;
    bottom: -0.3rem;
    left: 50%;
    transform: translateX(-50%) rotate(45deg);
    background: #333333;
}

.input-wrapper:hover .tooltip {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(-10px);
}

button {
    background-color: #212121;
    border: none;
    width: 100%;
    height: 50px;
    border-radius: 10px;
    font-size: 20px;
    color: #f9f9f9;
    position: relative;
    cursor: pointer;
    overflow: hidden;
    z-index: 0;
}

button span {
    position: relative;
    z-index: 1;
}

button:before, button:after {
    content: "";
    position: absolute;
    background-color: #212121;
    transition: transform 0.4s ease;
    z-index: 0;
}

button:before {
    height: 4px;
    width: 100%;
    top: 0;
    left: 0;
    transform: scaleX(0);
}

button:after {
    height: 4px;
    width: 100%;
    bottom: 0;
    right: 0;
    transform: scaleX(0);
}

button:hover:before {
    transform: scaleX(1);
}

button:hover:after {
    transform: scaleX(1);
}

.result-container {
    margin-top: 20px;
}

.bmi-result{
    margin-bottom: 10px;
    font-size: 24px;
    cursor: pointer;
    position: relative;
    display: inline-block;
}

.bmi-result:hover .tooltip {
    opacity: 1;
    pointer-events: auto;
    transform: translateX(-50%) translateY(-10px);
}

JavaScript File

document.getElementById('calculate-btn').addEventListener('click', function() {
    const weight = parseFloat(document.getElementById('weight').value);
    const height = parseFloat(document.getElementById('height').value);

    console.log(weight);
    console.log(height);

    if (isNaN(weight) || isNaN(height) || height < 0 || weight < 0 || height === " " || weight === " ") {
        alert('Please provide valid numbers for weight and height.');
        return;
    }

    const heightInMeters = height * 0.3048;
    const bmi = (weight / (heightInMeters ** 2)).toFixed(2);
    const resultElement = document.getElementById('bmi-result');
    const descriptionElement = document.getElementById('bmi-description');

console.log(heightInMeters);
console.log(bmi);
console.log(resultElement);
console.log(descriptionElement);

    resultElement.textContent = `Your BMI: ${bmi}`;
    descriptionElement.textContent = getBMIDescription(bmi);
});

document.querySelectorAll('.color-info').forEach(info => {
    info.addEventListener('mouseover', function () {
        const tooltip = document.createElement('span');
        tooltip.className = 'tooltip';
        tooltip.innerText = 'Copy';
        info.appendChild(tooltip);

        console.log(tooltip);

    });

    info.addEventListener('mouseout', function () {
        const tooltip = info.querySelector('.tooltip');
        if (tooltip) {
            tooltip.remove();
        }
    });

    info.addEventListener('click', function () {
        const tooltip = info.querySelector('.tooltip');
        navigator.clipboard.writeText(info.innerText).then(() => {
            tooltip.innerText = 'Copied!';
            setTimeout(() => {
                tooltip.innerText = 'Copy';
            }, 1000);
        });
    });
});

function getBMIDescription(bmi) {
    if (bmi < 16) {
        return 'Severe Thinness';
    } else if (bmi < 17) {
        return 'Moderate Thinness';
    } else if (bmi < 18.5) {
        return 'Mild Thinness';
    } else if (bmi < 25) {
        return 'Normal';
    } else if (bmi < 30) {
        return 'Overweight';
    } else if (bmi < 35) {
        return 'Obese Class I';
    } else if (bmi < 40) {
        return 'Obese Class II';
    } else {
        return 'Obese Class III';
    }
}