html-tools/temperature-converter.html at main · levups/html-tools · GitHub

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<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Temperature Converter</title>
    <link rel="stylesheet" href="common.css">
    <style>
        body {
            display: flex;
            flex-direction: column;
        }

        .temp-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(280px, 1fr));
            gap: 16px;
            max-width: 1200px;
            margin: 0 auto;
            width: 100%;
        }

        .temp-card {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 16px;
            box-shadow: var(--shadow-soft);
            padding: 20px;
            transition: transform 0.2s, box-shadow 0.2s;
        }

        .temp-card:hover {
            transform: translateY(-2px);
            box-shadow: var(--shadow-elevated);
        }

        .temp-card:focus-within {
            box-shadow: var(--shadow-md);
        }

        .temp-header {
            display: flex;
            justify-content: space-between;
            align-items: center;
            margin-bottom: 12px;
        }

        .temp-name {
            font-weight: 600;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-secondary);
        }

        .temp-symbol {
            font-size: 0.75rem;
            color: var(--text-muted);
            font-weight: 500;
        }

        .temp-input {
            width: 100%;
            padding: 14px 16px;
            border: 1px solid var(--input-border);
            border-radius: 8px;
            font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
            font-size: 1.1rem;
            background: var(--input-bg);
            color: var(--text-primary);
            outline: none;
            transition: border-color 0.15s, box-shadow 0.15s;
        }

        .temp-input:hover {
            border-color: var(--text-muted);
        }

        .temp-input:focus {
            border-color: var(--input-border-focus);
            box-shadow: 0 0 0 3px var(--ring-color);
        }

        .temp-input::placeholder {
            color: var(--text-muted);
        }

        .reference-points {
            max-width: 800px;
            margin: 40px auto 0;
            width: 100%;
        }

        .reference-title {
            font-weight: 600;
            font-size: 0.85rem;
            text-transform: uppercase;
            letter-spacing: 0.5px;
            color: var(--text-secondary);
            margin-bottom: 16px;
            text-align: center;
        }

        .reference-grid {
            display: grid;
            grid-template-columns: repeat(auto-fill, minmax(200px, 1fr));
            gap: 12px;
        }

        .reference-item {
            background: var(--card-bg);
            border: 1px solid var(--card-border);
            border-radius: 10px;
            padding: 14px 16px;
            cursor: pointer;
            transition: transform 0.15s, box-shadow 0.15s, border-color 0.15s;
        }

        .reference-item:hover {
            transform: translateY(-1px);
            box-shadow: var(--shadow-sm);
            border-color: var(--text-muted);
        }

        .reference-item:focus {
            outline: none;
            box-shadow: 0 0 0 3px var(--ring-color);
            border-color: var(--input-border-focus);
        }

        .reference-label {
            font-size: 0.8125rem;
            color: var(--text-secondary);
            margin-bottom: 4px;
        }

        .reference-value {
            font-family: ui-monospace, SFMono-Regular, "SF Mono", Menlo, Consolas, "Liberation Mono", monospace;
            font-size: 0.9375rem;
            color: var(--text-primary);
            font-weight: 500;
        }

        @media (max-width: 768px) {
            .temp-grid {
                grid-template-columns: 1fr;
            }

            .reference-grid {
                grid-template-columns: 1fr 1fr;
            }
        }

        @media (max-width: 480px) {
            .reference-grid {
                grid-template-columns: 1fr;
            }
        }
    </style>
</head>
<body>

    <a href="index.html" class="back-link">
        <svg viewBox="0 0 24 24" fill="none" stroke="currentColor" stroke-width="2" stroke-linecap="round" stroke-linejoin="round">
            <path d="M19 12H5M12 19l-7-7 7-7"/>
        </svg>
        All Tools
    </a>

    <header>
        <h1>Temperature Converter</h1>
        <p class="subtitle">Convert between all major temperature scales</p>
    </header>

    <div class="temp-grid" id="tempGrid">
        <div class="temp-card" data-scale="celsius">
            <div class="temp-header">
                <label for="celsius" class="temp-name">Celsius</label>
                <span class="temp-symbol">°C</span>
            </div>
            <input type="number" id="celsius" class="temp-input" placeholder="0" step="any" aria-label="Temperature in Celsius">
        </div>

        <div class="temp-card" data-scale="fahrenheit">
            <div class="temp-header">
                <label for="fahrenheit" class="temp-name">Fahrenheit</label>
                <span class="temp-symbol">°F</span>
            </div>
            <input type="number" id="fahrenheit" class="temp-input" placeholder="32" step="any" aria-label="Temperature in Fahrenheit">
        </div>

        <div class="temp-card" data-scale="kelvin">
            <div class="temp-header">
                <label for="kelvin" class="temp-name">Kelvin</label>
                <span class="temp-symbol">K</span>
            </div>
            <input type="number" id="kelvin" class="temp-input" placeholder="273.15" step="any" aria-label="Temperature in Kelvin">
        </div>

        <div class="temp-card" data-scale="rankine">
            <div class="temp-header">
                <label for="rankine" class="temp-name">Rankine</label>
                <span class="temp-symbol">°R</span>
            </div>
            <input type="number" id="rankine" class="temp-input" placeholder="491.67" step="any" aria-label="Temperature in Rankine">
        </div>

        <div class="temp-card" data-scale="delisle">
            <div class="temp-header">
                <label for="delisle" class="temp-name">Delisle</label>
                <span class="temp-symbol">°De</span>
            </div>
            <input type="number" id="delisle" class="temp-input" placeholder="150" step="any" aria-label="Temperature in Delisle">
        </div>

        <div class="temp-card" data-scale="newton">
            <div class="temp-header">
                <label for="newton" class="temp-name">Newton</label>
                <span class="temp-symbol">°N</span>
            </div>
            <input type="number" id="newton" class="temp-input" placeholder="0" step="any" aria-label="Temperature in Newton">
        </div>

        <div class="temp-card" data-scale="reaumur">
            <div class="temp-header">
                <label for="reaumur" class="temp-name">Réaumur</label>
                <span class="temp-symbol">°Ré</span>
            </div>
            <input type="number" id="reaumur" class="temp-input" placeholder="0" step="any" aria-label="Temperature in Réaumur">
        </div>

        <div class="temp-card" data-scale="romer">
            <div class="temp-header">
                <label for="romer" class="temp-name">Rømer</label>
                <span class="temp-symbol">°Rø</span>
            </div>
            <input type="number" id="romer" class="temp-input" placeholder="7.5" step="any" aria-label="Temperature in Rømer">
        </div>
    </div>

    <div class="reference-points">
        <div class="reference-title">Quick Reference Points</div>
        <div class="reference-grid" role="list">
            <button class="reference-item" data-celsius="-273.15" role="listitem" aria-label="Set to Absolute Zero">
                <div class="reference-label">Absolute Zero</div>
                <div class="reference-value">−273.15 °C</div>
            </button>
            <button class="reference-item" data-celsius="0" role="listitem" aria-label="Set to Water Freezing Point">
                <div class="reference-label">Water Freezing</div>
                <div class="reference-value">0 °C</div>
            </button>
            <button class="reference-item" data-celsius="20" role="listitem" aria-label="Set to Room Temperature">
                <div class="reference-label">Room Temperature</div>
                <div class="reference-value">20 °C</div>
            </button>
            <button class="reference-item" data-celsius="37" role="listitem" aria-label="Set to Body Temperature">
                <div class="reference-label">Body Temperature</div>
                <div class="reference-value">37 °C</div>
            </button>
            <button class="reference-item" data-celsius="100" role="listitem" aria-label="Set to Water Boiling Point">
                <div class="reference-label">Water Boiling</div>
                <div class="reference-value">100 °C</div>
            </button>
            <button class="reference-item" data-celsius="-40" role="listitem" aria-label="Set to Fahrenheit-Celsius Equal Point">
                <div class="reference-label">°F = °C Point</div>
                <div class="reference-value">−40 °C / °F</div>
            </button>
        </div>
    </div>

    <script>
        // Round to reasonable precision
        const round = (val, decimals = 4) => {
            const num = Math.round(val * 10**decimals) / 10**decimals;
            return Object.is(num, -0) ? 0 : num;
        };

        // Conversion functions (all use Celsius as base)
        const conversions = {
            // To Celsius
            toCelsius: {
                celsius: c => c,
                fahrenheit: f => (f - 32) * 5/9,
                kelvin: k => k - 273.15,
                rankine: r => (r - 491.67) * 5/9,
                delisle: de => 100 - de * 2/3,
                newton: n => n * 100/33,
                reaumur: re => re * 5/4,
                romer: ro => (ro - 7.5) * 40/21
            },
            // From Celsius
            fromCelsius: {
                celsius: c => c,
                fahrenheit: c => c * 9/5 + 32,
                kelvin: c => c + 273.15,
                rankine: c => (c + 273.15) * 9/5,
                delisle: c => (100 - c) * 3/2,
                newton: c => c * 33/100,
                reaumur: c => c * 4/5,
                romer: c => c * 21/40 + 7.5
            }
        };

        const scales = ['celsius', 'fahrenheit', 'kelvin', 'rankine', 'delisle', 'newton', 'reaumur', 'romer'];
        const inputs = {};
        let updating = false;

        // Get all inputs
        scales.forEach(scale => {
            inputs[scale] = document.getElementById(scale);
        });

        // Update all fields from a source scale
        function updateFromScale(sourceScale, value) {
            if (updating) return;
            updating = true;

            const celsius = conversions.toCelsius[sourceScale](value);

            scales.forEach(scale => {
                if (scale !== sourceScale) {
                    const converted = conversions.fromCelsius[scale](celsius);
                    inputs[scale].value = isNaN(converted) ? '' : round(converted);
                }
            });

            updateURL(sourceScale, value);
            updating = false;
        }

        // Clear all fields
        function clearAll() {
            scales.forEach(scale => {
                inputs[scale].value = '';
            });
        }

        // Update URL with current value
        function updateURL(scale, value) {
            const url = new URL(window.location.href);
            if (value !== '' && !isNaN(value)) {
                url.searchParams.set('scale', scale);
                url.searchParams.set('value', value);
            } else {
                url.searchParams.delete('scale');
                url.searchParams.delete('value');
            }
            history.replaceState(null, '', url.toString());
        }

        // Add event listeners
        scales.forEach(scale => {
            inputs[scale].addEventListener('input', (e) => {
                const value = e.target.value;
                if (value === '' || value === '-') {
                    clearAll();
                    e.target.value = value;
                    return;
                }
                const numValue = parseFloat(value);
                if (!isNaN(numValue)) {
                    updateFromScale(scale, numValue);
                }
            });
        });

        // Reference point buttons
        document.querySelectorAll('.reference-item').forEach(item => {
            item.addEventListener('click', () => {
                const celsius = parseFloat(item.dataset.celsius);
                inputs.celsius.value = round(celsius);
                updateFromScale('celsius', celsius);
            });
        });

        // Load from URL on init
        const params = new URLSearchParams(window.location.search);
        const initialScale = params.get('scale');
        const initialValue = params.get('value');

        if (initialScale && initialValue && scales.includes(initialScale)) {
            const numValue = parseFloat(initialValue);
            if (!isNaN(numValue)) {
                inputs[initialScale].value = round(numValue);
                updateFromScale(initialScale, numValue);
            }
        }
    </script>
</body>
</html>