Hotodogo | Snippets: Download ETA Calculator

CSS Before Head

<meta name="viewport" content="width=device-width, initial-scale=1.0">

HTML Head

:root {
    --primary: #6366f1;
    --primary-hover: #4f46e5;
    --bg: #f1f5f9;
    --card: #ffffff;
    --text: #1e293b;
    --text-muted: #64748b;
    --border: #e2e8f0;
    --radius: 12px;
    --shadow: 0 4px 24px rgba(0,0,0,0.08);
}

* { box-sizing: border-box; margin: 0; padding: 0; }

body {
    font-family: 'Segoe UI', system-ui, -apple-system, sans-serif;
    background: var(--bg);
    color: var(--text);
    min-height: 100vh;
    display: flex;
    justify-content: center;
    align-items: flex-start;
    padding: 24px 16px;
}

.container {
    background: var(--card);
    border-radius: var(--radius);
    box-shadow: var(--shadow);
    padding: 32px;
    width: 100%;
    max-width: 520px;
}

h1 {
    font-size: 1.5rem;
    font-weight: 700;
    text-align: center;
    margin-bottom: 28px;
    color: var(--primary);
}

.field {
    margin-bottom: 20px;
}

.field label {
    display: block;
    font-weight: 600;
    font-size: 0.875rem;
    margin-bottom: 6px;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
}

.input-row {
    display: flex;
    gap: 8px;
}

.input-row input {
    flex: 1;
    min-width: 0;
}

.input-row select {
    width: 120px;
    flex-shrink: 0;
}

input[type="number"],
select {
    padding: 10px 14px;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    font-size: 1rem;
    color: var(--text);
    background: var(--card);
    transition: border-color 0.2s;
    appearance: auto;
}

input[type="number"]:focus,
select:focus {
    outline: none;
    border-color: var(--primary);
    box-shadow: 0 0 0 3px rgba(99,102,241,0.15);
}

input[type="number"]::placeholder {
    color: #94a3b8;
}

button {
    width: 100%;
    padding: 12px;
    background: var(--primary);
    color: #fff;
    border: none;
    border-radius: 8px;
    font-size: 1rem;
    font-weight: 600;
    cursor: pointer;
    transition: background 0.2s, transform 0.1s;
    margin-top: 4px;
}

button:hover {
    background: var(--primary-hover);
}

button:active {
    transform: scale(0.98);
}

.result-box {
    margin-top: 24px;
    padding: 20px;
    background: #f8fafc;
    border: 1.5px solid var(--border);
    border-radius: 8px;
    text-align: center;
    min-height: 64px;
    display: flex;
    flex-direction: column;
    justify-content: center;
    gap: 4px;
}

.result-box .time-value {
    font-size: 1.75rem;
    font-weight: 700;
    color: var(--primary);
    word-break: break-word;
}

.result-box .time-label {
    font-size: 0.8rem;
    color: var(--text-muted);
}

.result-box .error {
    color: #ef4444;
    font-size: 0.9rem;
}

.output-unit-row {
    display: flex;
    align-items: center;
    gap: 8px;
    margin-top: 16px;
    justify-content: center;
}

.output-unit-row label {
    font-size: 0.8rem;
    font-weight: 600;
    color: var(--text-muted);
    text-transform: uppercase;
    letter-spacing: 0.04em;
    margin-bottom: 0;
}

.output-unit-row select {
    padding: 6px 10px;
    font-size: 0.875rem;
}

CSS After Head

JS Before HTML Body

HTML Body Attrs

<div class="container">
    <h1>Download ETA Calculator</h1>

    <div class="field">
        <label>File Size</label>
        <div class="input-row">
            <input type="number" id="fileSize" min="0" step="any" placeholder="e.g. 1.5">
            <select id="sizeUnit">
                <option value="1">B</option>
                <option value="1024">KB</option>
                <option value="1048576" selected>MB</option>
                <option value="1073741824">GB</option>
                <option value="1099511627776">TB</option>
                <option value="1125899906842624">PB</option>
            </select>
        </div>
    </div>

    <div class="field">
        <label>Download Speed</label>
        <div class="input-row">
            <input type="number" id="speed" min="0" step="any" placeholder="e.g. 100">
            <select id="speedUnit">
                <option value="1">B/s</option>
                <option value="1024">KB/s</option>
                <option value="1048576" selected>MB/s</option>
                <option value="1073741824">GB/s</option>
                <option value="125000">Kbps</option>
                <option value="125000000">Mbps</option>
                <option value="125000000000">Gbps</option>
            </select>
        </div>
    </div>

    <button onclick="calculate()">Calculate</button>

    <div class="output-unit-row">
        <label for="outputUnit">Display unit:</label>
        <select id="outputUnit" onchange="recalculate()">
            <option value="auto" selected>Auto</option>
            <option value="seconds">Seconds</option>
            <option value="minutes">Minutes</option>
            <option value="hours">Hours</option>
            <option value="days">Days</option>
        </select>
    </div>

    <div class="result-box" id="result">
        <span class="time-label">Enter size and speed, then click Calculate</span>
    </div>
</div>

HTML Body

HTML Foot

let lastTotalBytes = null;

function calculate() {
    const sizeVal = parseFloat(document.getElementById('fileSize').value);
    const speedVal = parseFloat(document.getElementById('speed').value);
    const sizeUnit = parseFloat(document.getElementById('sizeUnit').value);
    const speedUnit = parseFloat(document.getElementById('speedUnit').value);
    const resultEl = document.getElementById('result');

    if (isNaN(sizeVal) || isNaN(speedVal)) {
        resultEl.innerHTML = '<span class="error">Please enter valid numbers for both fields.</span>';
        lastTotalBytes = null;
        return;
    }
    if (sizeVal <= 0 || speedVal <= 0) {
        resultEl.innerHTML = '<span class="error">Both values must be greater than zero.</span>';
        lastTotalBytes = null;
        return;
    }

    const totalBytes = sizeVal * sizeUnit;
    const bytesPerSecond = speedVal * speedUnit;
    lastTotalBytes = { totalBytes, bytesPerSecond };
    recalculate();
}

function recalculate() {
    const resultEl = document.getElementById('result');
    if (!lastTotalBytes) return;

    const { totalBytes, bytesPerSecond } = lastTotalBytes;
    const totalSeconds = totalBytes / bytesPerSecond;
    const mode = document.getElementById('outputUnit').value;

    let html = '';

    if (mode === 'auto') {
        html = formatAuto(totalSeconds);
    } else if (mode === 'seconds') {
        html = `<span class="time-value">${formatNum(totalSeconds)}</span><span class="time-label">seconds</span>`;
    } else if (mode === 'minutes') {
        const mins = totalSeconds / 60;
        html = `<span class="time-value">${formatNum(mins)}</span><span class="time-label">minutes</span>`;
    } else if (mode === 'hours') {
        const hrs = totalSeconds / 3600;
        html = `<span class="time-value">${formatNum(hrs)}</span><span class="time-label">hours</span>`;
    } else if (mode === 'days') {
        const days = totalSeconds / 86400;
        html = `<span class="time-value">${formatNum(days)}</span><span class="time-label">days</span>`;
    }

    resultEl.innerHTML = html;
}

function formatAuto(totalSeconds) {
    if (totalSeconds < 1) {
        const ms = totalSeconds * 1000;
        return `<span class="time-value">${formatNum(ms)}</span><span class="time-label">milliseconds</span>`;
    }

    const days = Math.floor(totalSeconds / 86400);
    const hours = Math.floor((totalSeconds % 86400) / 3600);
    const minutes = Math.floor((totalSeconds % 3600) / 60);
    const seconds = Math.floor(totalSeconds % 60);

    const parts = [];
    if (days > 0) parts.push(`${days} day${days !== 1 ? 's' : ''}`);
    if (hours > 0) parts.push(`${hours} hour${hours !== 1 ? 's' : ''}`);
    if (minutes > 0) parts.push(`${minutes} minute${minutes !== 1 ? 's' : ''}`);
    if (seconds > 0 || parts.length === 0) parts.push(`${seconds} second${seconds !== 1 ? 's' : ''}`);

    return `<span class="time-value">${parts.join(' ')}</span><span class="time-label">estimated download time</span>`;
}

function formatNum(n) {
    if (!isFinite(n)) return '∞';
    if (Number.isInteger(n)) return n.toLocaleString();
    return n.toLocaleString(undefined, { maximumFractionDigits: 2 });
}

document.addEventListener('keydown', function(e) {
    if (e.key === 'Enter') calculate();
});

JS After HTML Body