This calculator is for educational and informational purposes only. Body Surface Area calculations should be verified by qualified healthcare professionals before use in medical decisions, especially for chemotherapy dosing, pediatric medications, and critical care. Always consult with your physician or pharmacist for accurate dosing.
`;
printWindow.document.write(printContent);
printWindow.document.close();
printWindow.focus();
setTimeout(() => printWindow.print(), 250);
}
// Save to PDF (simulated)
function saveToPDF() {
if (!currentResult) return;
// Create a downloadable text file with results
const content = `BSA Calculation Report
Generated: ${new Date().toLocaleString()}RESULTS:
- BSA: ${currentResult.bsa.toFixed(3)} m²
- Formula: ${currentResult.formula}
- BMI: ${currentResult.bmi.toFixed(1)} kg/m²
- Body Type: ${currentResult.bodyType}
- Ideal Weight: ${currentResult.idealWeight.toFixed(1)} kgCLINICAL NOTES:
${currentResult.interpretation.join('\n')}DISCLAIMER: For informational purposes only. Consult healthcare professionals.`;
const blob = new Blob([content], { type: 'text/plain' });
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = `BSA_Calculation_${new Date().getTime()}.txt`;
a.click();
URL.revokeObjectURL(url);
alert('Results saved as text file. For PDF, please use the Print function and select "Save as PDF".');
}
// Copy results to clipboard
function copyResults() {
if (!currentResult) return;
const text = `Body Surface Area: ${currentResult.bsa.toFixed(3)} m²
Formula: ${currentResult.formula}
BMI: ${currentResult.bmi.toFixed(1)} kg/m²
Body Type: ${currentResult.bodyType}
Ideal Weight: ${currentResult.idealWeight.toFixed(1)} kg
Generated: ${new Date().toLocaleString()}`;
navigator.clipboard.writeText(text).then(() => {
alert('Results copied to clipboard!');
}).catch(err => {
// Fallback for older browsers
const textArea = document.createElement('textarea');
textArea.value = text;
document.body.appendChild(textArea);
textArea.select();
document.execCommand('copy');
document.body.removeChild(textArea);
alert('Results copied to clipboard!');
});
}
// Social sharing
function shareResult(platform) {
if (!currentResult) {
alert('Please calculate BSA first before sharing.');
return;
}
const text = `My Body Surface Area is ${currentResult.bsa.toFixed(3)} m² (calculated using ${currentResult.formula})`;
const url = window.location.href;
const shareUrl = getShareUrl(platform, text, url);
if (shareUrl) {
if (platform === 'email') {
window.location.href = shareUrl;
} else if (platform === 'reddit' || platform === 'pinterest' || platform === 'linkedin') {
window.open(shareUrl, '_blank', 'width=600,height=400');
} else {
window.open(shareUrl, '_blank', 'noopener,noreferrer');
}
}
}
// Generate share URLs
function getShareUrl(platform, text, url) {
const encodedText = encodeURIComponent(text);
const encodedUrl = encodeURIComponent(url);
const urls = {
facebook: `https://www.facebook.com/sharer/sharer.php?u=${encodedUrl}"e=${encodedText}`,
x: `https://twitter.com/intent/tweet?text=${encodedText}&url=${encodedUrl}`,
whatsapp: `https://wa.me/?text=${encodedText}%20${encodedUrl}`,
telegram: `https://t.me/share/url?url=${encodedUrl}&text=${encodedText}`,
reddit: `https://www.reddit.com/submit?url=${encodedUrl}&title=${encodedText}`,
pinterest: `https://pinterest.com/pin/create/button/?url=${encodedUrl}&description=${encodedText}`,
linkedin: `https://www.linkedin.com/sharing/share-offsite/?url=${encodedUrl}`,
tiktok: `https://www.tiktok.com/upload?caption=${encodedText}%20${encodedUrl}`,
vk: `https://vk.com/share.php?url=${encodedUrl}&title=${encodedText}`,
email: `mailto:?subject=Body Surface Area Calculation&body=${encodedText}%0A%0A${encodedUrl}`
};
return urls[platform] || null;
}
// Save calculation to localStorage
function saveCalculation(result) {
try {
const calculations = JSON.parse(localStorage.getItem('bsaCalculations') || '[]');
calculations.unshift(result);
// Keep only last 10 calculations
if (calculations.length > 10) {
calculations.splice(10);
}
localStorage.setItem('bsaCalculations', JSON.stringify(calculations));
localStorage.setItem('lastBSA', JSON.stringify(result));
} catch (error) {
console.error('Failed to save calculation:', error);
}
}
// Load saved data
function loadSavedData() {
try {
const last = localStorage.getItem('lastBSA');
if (last) {
const parsed = JSON.parse(last);
// Pre-fill form if recent (< 1 hour)
const oneHourAgo = new Date().getTime() - (60 * 60 * 1000);
const calcTime = new Date(parsed.timestamp).getTime();
if (calcTime > oneHourAgo) {
document.getElementById('height').value = parsed.inputs.height || '';
document.getElementById('weight').value = parsed.inputs.weight || '';
document.getElementById('age').value = parsed.inputs.age || '';
document.getElementById('gender').value = parsed.inputs.gender || '';
// Set unit system
if (parsed.inputs.unit === 'imperial') {
document.getElementById('imperial').click();
}
// Set formula
const formulaMap = {
'Du Bois Formula': 'du-bois',
'Mosteller Formula': 'mosteller',
'Haycock Formula': 'haycock',
'Gehan & George Formula': 'gehan-george',
'Boyd Formula': 'boyd',
'Fujimoto Formula': 'fujimoto'
};
const formulaValue = formulaMap[parsed.formula];
if (formulaValue) {
const formulaRadio = document.querySelector(`input[value="${formulaValue}"]`);
if (formulaRadio) {
formulaRadio.click();
const parent = formulaRadio.closest('.formula-option');
if (parent) {
document.querySelectorAll('.formula-option').forEach(o => o.classList.remove('selected'));
parent.classList.add('selected');
}
}
}
}
}
} catch (error) {
console.error('Failed to load saved data:', error);
}
}
// Additional BMI calculation for reference
function calculateBMI(weight, height) {
return weight / ((height / 100) ** 2);
}
// Helper: Convert cm to inches
function cmToInches(cm) {
return cm / 2.54;
}
// Helper: Convert kg to lbs
function kgToLbs(kg) {
return kg / 0.453592;
}
// Performance optimization: Lazy load external resources
if ('IntersectionObserver' in window) {
// No images to lazy load in this calculator, but keeping for consistency
}
// Core Web Vitals optimization
// Pre-connect to common social media domains
const preconnect = [
'https://www.facebook.com',
'https://twitter.com',
'https://wa.me',
'https://t.me'
];
preconnect.forEach(domain => {
const link = document.createElement('link');
link.rel = 'preconnect';
link.href = domain;
link.crossOrigin = 'anonymous';
document.head.appendChild(link);
});