Note: All stock and performance data, including ESG scores, are simulated and do not reflect real-world values. This tool is for demonstration purposes only.

`; resultsOutput.innerHTML = tableHtml; } /** * Renders charts based on screening results (e.g., ESG score distribution). * @param {Object} results - Results from performScreening. */ function renderChart(results) { const stocks = results.screenedStocks; if (!stocks || stocks.length === 0) { chartPlaceholder.classList.remove('hidden'); if (esgChartInstance) { esgChartInstance.destroy(); esgChartInstance = null; } return; } chartPlaceholder.classList.add('hidden'); // Hide placeholder if chart can be rendered const ctx = document.getElementById('esgScoreChart').getContext('2d'); // Destroy existing chart instance if it exists to prevent overlap if (esgChartInstance) { esgChartInstance.destroy(); } // Data for ESG scores distribution (e.g., average scores or counts by range) const envScores = stocks.map(s => s.esg.environmental); const socialScores = stocks.map(s => s.esg.social); const governanceScores = stocks.map(s => s.esg.governance); const averageEnv = envScores.reduce((sum, score) => sum + score, 0) / envScores.length; const averageSocial = socialScores.reduce((sum, score) => sum + score, 0) / socialScores.length; const averageGovernance = governanceScores.reduce((sum, score) => sum + score, 0) / governanceScores.length; const chartLabels = ['Environmental', 'Social', 'Governance']; const chartData = [averageEnv, averageSocial, averageGovernance]; const chartColors = ['#10B981', '#3B82F6', '#A855F7']; // Green, Blue, Purple esgChartInstance = new Chart(ctx, { type: 'bar', // Bar chart for average ESG scores data: { labels: chartLabels, datasets: [{ label: 'Average ESG Score for Screened Stocks', data: chartData, backgroundColor: chartColors, borderColor: chartColors.map(color => color.replace('0.2', '1')), borderWidth: 1 }] }, options: { responsive: true, maintainAspectRatio: false, plugins: { legend: { display: true, position: 'top', labels: { font: { size: 14, family: 'Inter', }, color: '#333' } }, title: { display: true, text: `Average ESG Scores for ${stocks.length} Screened Stocks`, font: { size: 18, family: 'Inter', weight: 'bold' }, color: '#1F2937' }, tooltip: { callbacks: { label: function(context) { return `${context.label}: ${context.parsed.y.toFixed(2)}`; } } } }, scales: { y: { beginAtZero: true, max: 100, title: { display: true, text: 'Score (0-100)', font: { size: 14, family: 'Inter' }, color: '#333' }, ticks: { font: { family: 'Inter' } } }, x: { ticks: { font: { family: 'Inter' } } } } } }); } /** * Handles the PDF download functionality. * Captures the results output and chart canvas to generate a PDF report. */ window.downloadPdf = async function() { // Ensure jsPDF and html2canvas libraries are loaded if (typeof html2canvas === 'undefined' || typeof jspdf === 'undefined' || typeof jspdf.jsPDF === 'undefined') { displayMessage('PDF generation libraries not loaded. Please try again or refresh.'); return; } hideMessage(); // Clear any existing messages const { jsPDF } = jspdf; const doc = new jsPDF('p', 'pt', 'a4'); // 'p' for portrait, 'pt' for points, 'a4' for A4 size // Define the elements to be captured for the PDF report const elementsToCapture = [ document.getElementById('resultsOutput'), document.getElementById('esgScoreChart') ]; let yPos = 40; // Initial Y position for content in the PDF // Add a main title to the PDF report doc.setFontSize(22); doc.setTextColor(51, 51, 51); // Dark gray doc.text('ESG Stock Screening Report', doc.internal.pageSize.getWidth() / 2, yPos, { align: 'center' }); yPos += 30; // Move down for next element // Add generation date doc.setFontSize(12); doc.setTextColor(100, 100, 100); // Medium gray doc.text(`Generated on: ${new Date().toLocaleDateString()}`, doc.internal.pageSize.getWidth() / 2, yPos, { align: 'center' }); yPos += 40; // Move down for next element // Iterate through the captured canvases and add them to the PDF for (const element of elementsToCapture) { try { // Temporarily make the element visible if it's currently hidden const wasHidden = element.classList.contains('hidden'); if (wasHidden) { element.classList.remove('hidden'); } const canvas = await html2canvas(element, { scale: 2, // Increase scale for better resolution in PDF useCORS: true, // Required for images/fonts loaded from other origins if any backgroundColor: '#ffffff' // Ensure white background for captured content }); // Restore hidden state if it was temporarily made visible if (wasHidden) { element.classList.add('hidden'); } const imgData = canvas.toDataURL('image/png'); // Convert canvas to PNG data URL const imgWidth = 550; // Desired width for the image in the PDF (A4 is approx 595pt wide) const imgHeight = (canvas.height * imgWidth) / canvas.width; // Maintain aspect ratio // Check if the image fits on the current page. If not, add a new page. if (yPos + imgHeight > doc.internal.pageSize.getHeight() - 40) { // Check against a 40pt bottom margin doc.addPage(); // Add a new page yPos = 40; // Reset Y position for the new page } // Add the image to the PDF, centered horizontally doc.addImage(imgData, 'PNG', (doc.internal.pageSize.getWidth() - imgWidth) / 2, yPos, imgWidth, imgHeight); yPos += imgHeight + 30; // Move Y position down, adding some padding } catch (error) { console.error('Error capturing element for PDF:', error); displayMessage('Failed to generate part of the PDF. Please ensure all data is loaded.'); } } // Save the generated PDF file doc.save('ESG_Stock_Screener_Report.pdf'); }; // Initial setup: Show the input tab and update navigation buttons when the DOM is ready showTab('input'); });