Suggested Daily Portion Sizes
This table provides examples of portion sizes to help you meet your daily targets. Mix and match from each food group throughout your day.
| Food Group |
Suggested Portions (spread across meals) |
| Lean Protein |
~${Math.round(proteinGrams / 7)} oz cooked chicken, fish, or lean meat (approx. ${Math.round(proteinGrams / 25)} palm-sized portions) |
| Complex Carbs |
~${(carbGrams / 25).toFixed(1)} cups cooked rice, quinoa, or pasta |
| Healthy Fats |
~${Math.round(fatGrams / 14)} tbsp olive oil/nut butter, or ~${(fatGrams / 15).toFixed(1)} oz nuts/seeds |
| Vegetables |
4-6 cups of leafy greens, broccoli, peppers, etc. (minimal calorie impact) |
| Fruits |
2-3 servings (e.g., 1 medium apple, 1 cup berries) |
`;
}
};
// --- 5. EVENT LISTENERS ---
/**
* Handles 'Next' button clicks.
*/
const handleNext = () => {
if (currentTab === 0 && !validateInputs()) {
return; // Stop if validation fails on the first tab
}
if (currentTab < tabs.length - 1) {
currentTab++;
// If moving to the final tab, perform calculation
if (currentTab === tabs.length - 1) {
calculateAndDisplayResults();
}
updateUI();
}
};
/**
* Handles 'Previous' button clicks.
*/
const handlePrev = () => {
if (currentTab > 0) {
currentTab--;
updateUI();
}
};
/**
* Handles PDF download functionality.
*/
const handlePdfDownload = () => {
const { jsPDF } = window.jspdf;
const contentToPrint = document.getElementById('printable-content');
const buttonContainer = document.getElementById('pdf-button-container');
if (!contentToPrint || !buttonContainer) {
console.error('Printable content or button container not found.');
showError('Could not generate PDF. Please try again.');
return;
}
// Temporarily hide the button container so it's not in the PDF
buttonContainer.classList.add('hide-for-pdf');
html2canvas(contentToPrint, {
scale: 2, // Increase scale for better resolution
useCORS: true,
logging: false,
onclone: (document) => {
// This ensures styles are correctly applied in the cloned document
// that html2canvas uses for rendering.
}
}).then(canvas => {
// Restore button visibility right after capture
buttonContainer.classList.remove('hide-for-pdf');
const imgData = canvas.toDataURL('image/png');
const pdf = new jsPDF({
orientation: 'portrait',
unit: 'pt',
format: 'a4'
});
const pdfWidth = pdf.internal.pageSize.getWidth();
const pdfHeight = pdf.internal.pageSize.getHeight();
const canvasWidth = canvas.width;
const canvasHeight = canvas.height;
const ratio = canvasWidth / pdfWidth;
const calculatedHeight = canvasHeight / ratio;
// Check if content is taller than one page
let heightLeft = calculatedHeight;
let position = 0;
// Add the first page
pdf.addImage(imgData, 'PNG', 0, position, pdfWidth, calculatedHeight);
heightLeft -= pdfHeight;
// Add new pages if content overflows
while (heightLeft > 0) {
position -= pdfHeight;
pdf.addPage();
pdf.addImage(imgData, 'PNG', 0, position, pdfWidth, calculatedHeight);
heightLeft -= pdfHeight;
}
pdf.save('Meal_Portion_Plan.pdf');
}).catch(err => {
// Ensure button is visible even if there's an error
buttonContainer.classList.remove('hide-for-pdf');
console.error('PDF generation failed:', err);
showError('An error occurred while generating the PDF.');
});
};
// Attach event listeners
if (nextBtn) nextBtn.addEventListener('click', handleNext);
if (prevBtn) prevBtn.addEventListener('click', handlePrev);
if (downloadPdfBtn) downloadPdfBtn.addEventListener('click', handlePdfDownload);
// --- 6. INITIALIZATION ---
// Set the initial state of the UI when the script loads.
updateUI();
});
