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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>JSON 2 Dashboard</title>
<script src="https://cdn.plot.ly/plotly-latest.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/html2pdf.js/0.10.1/html2pdf.bundle.min.js"></script>
<link rel="stylesheet" href="https://cdnjs.cloudflare.com/ajax/libs/font-awesome/6.0.0/css/all.min.css">
<style>
:root {
--bg-color: #f5f7fa;
--text-color: #1a202c;
--card-bg: #ffffff;
--border-color: #e2e8f0;
--accent-color: #3b82f6;
--accent-hover: #2563eb;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.05);
--shadow-md: 0 4px 6px rgba(0,0,0,0.07);
--shadow-lg: 0 10px 25px rgba(0,0,0,0.1);
--gradient-primary: linear-gradient(135deg,#667eea 0%,#764ba2 100%);
--gradient-accent: linear-gradient(135deg,#f093fb 0%,#f5576c 100%);
}
.dark-mode {
--bg-color: #0f172a;
--text-color: #f1f5f9;
--card-bg: #1e293b;
--border-color: #334155;
--shadow-sm: 0 1px 3px rgba(0,0,0,0.3);
--shadow-md: 0 4px 6px rgba(0,0,0,0.4);
--shadow-lg: 0 10px 25px rgba(0,0,0,0.5);
}
* { box-sizing: border-box; margin: 0; padding: 0; }
body {
font-family: system-ui,-apple-system,BlinkMacSystemFont,'Segoe UI',Roboto,'Helvetica Neue',Arial,sans-serif;
background: var(--bg-color); color: var(--text-color); transition: background .3s ease,color .3s ease;
line-height: 1.6; padding: 20px;
}
.container { max-width: 1400px; margin: 0 auto; }
.header { display:flex;justify-content:space-between;align-items:center; margin-bottom:30px; padding:1.5rem 2rem;
background:rgba(255,255,255,0.7); backdrop-filter:blur(10px); border-radius:16px; box-shadow:var(--shadow-lg); transition:.3s; border:1px solid rgba(255,255,255,.3);}
.dark-mode .header { background:rgba(30,41,59,0.7); border:1px solid rgba(51,65,85,0.3);}
.header h1 { font-size:1.75rem;font-weight:700;
background:var(--gradient-primary);
-webkit-background-clip:text; -webkit-text-fill-color:transparent; background-clip:text;}
.actions { display:flex;gap:12px;align-items:center; }
.theme-toggle { background:var(--card-bg); border:1px solid var(--border-color); color:var(--accent-color); cursor:pointer;
font-size:1.25rem;padding:10px;border-radius:12px;transition:.3s; box-shadow:var(--shadow-sm); width:44px;height:44px;display:flex;align-items:center;justify-content:center;}
.theme-toggle:hover { transform:translateY(-2px) rotate(15deg); box-shadow:var(--shadow-md); border-color:var(--accent-color);}
.action-btn { display:flex;align-items:center;gap:8px; background:var(--accent-color); border:none;color:white;padding:10px 20px;
border-radius:12px;cursor:pointer;transition:.3s;font-weight:600;font-size:.9rem;box-shadow:var(--shadow-sm);}
.action-btn:hover { background:var(--accent-hover); transform:translateY(-2px); box-shadow:var(--shadow-md);}
.action-btn:active { transform:translateY(0); }
.input-section { display:grid;grid-template-columns:repeat(auto-fit,minmax(300px,1fr)); gap:24px; margin-bottom:24px; }
.upload-section,.json-input-section { background:var(--card-bg);padding:24px;border-radius:16px;box-shadow:var(--shadow-md);border:1px solid var(--border-color);transition:.3s;}
.upload-section:hover,.json-input-section:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg);}
.upload-section h3,.json-input-section h3 { font-size:1.1rem;margin-bottom:16px;color:var(--text-color);font-weight:600;}
input[type="file"] { width:100%;padding:12px;border:2px dashed var(--border-color);border-radius:12px;background:var(--bg-color);color:var(--text-color);cursor:pointer;transition:.3s;}
input[type="file"]:hover { border-color:var(--accent-color);background:rgba(59,130,246,0.05);}
.json-input { width:100%;height:120px;padding:14px;border:1px solid var(--border-color);border-radius:12px;background:var(--bg-color);color:var(--text-color);font-family:'Courier New',monospace;font-size:.9rem;resize:none;transition:.3s;}
.json-input:focus { outline:none;border-color:var(--accent-color);box-shadow:0 0 0 3px rgba(59,130,246,0.1);}
.run-btn { background:var(--gradient-primary);color:white;border:none;padding:10px 24px;border-radius:10px;cursor:pointer;margin-top:12px;font-weight:600;display:flex;align-items:center;gap:8px;transition:.3s;box-shadow:var(--shadow-sm);}
.run-btn:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); opacity:.95;}
#statusMsg { margin:12px 0 0 0; font-size:1rem; color:#e53e3e; font-weight:500;}
.chart-controls { display:flex;flex-wrap:wrap;gap:12px;margin-bottom:24px;padding:20px;background:rgba(255,255,255,.6);backdrop-filter:blur(10px);border:1px solid rgba(255,255,255,.3);border-radius:16px;box-shadow:var(--shadow-md);}
.dark-mode .chart-controls { background:rgba(30,41,59,.6); border:1px solid rgba(51,65,85,.3);}
.chart-controls h3 { width:100%;margin:0 0 12px 0;font-size:1.1rem;font-weight:600;}
.chart-toggle { display:flex;align-items:center;gap:8px;padding:10px 16px;background:var(--card-bg);border:1px solid var(--border-color);border-radius:10px;cursor:pointer;transition:.3s;font-size:.9rem;box-shadow:var(--shadow-sm);}
.chart-toggle:hover { transform:translateY(-2px); box-shadow:var(--shadow-md); border-color:var(--accent-color);}
.chart-toggle input[type="checkbox"] { cursor:pointer;width:18px;height:18px; accent-color:var(--accent-color);}
.grid { display:grid;grid-template-columns:repeat(auto-fit,minmax(450px,1fr)); gap:24px; margin-bottom:24px; }
.chart-container { background:var(--card-bg);padding:20px;border-radius:16px;border:1px solid var(--border-color);box-shadow:var(--shadow-md);transition:.3s;overflow:hidden;}
.chart-container:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg);}
#summaryStats { display:grid;grid-template-columns:repeat(auto-fit,minmax(280px,1fr)); gap:20px; margin-bottom:24px; }
.stat-card { background:var(--card-bg);padding:24px;border-radius:16px;border:1px solid var(--border-color);box-shadow:var(--shadow-md);transition:.3s;position:relative;overflow:hidden;}
.stat-card::before { content:''; position:absolute;top:0;left:0;width:4px;height:100%;background:var(--gradient-primary);}
.stat-card:hover { transform:translateY(-4px); box-shadow:var(--shadow-lg);}
.stat-card h3 { font-size:1rem;margin-bottom:16px;color:var(--accent-color);font-weight:600;text-transform:uppercase;letter-spacing:.5px;}
.stat-card p { margin:8px 0;font-size:.95rem;display:flex;justify-content:space-between;}
.popup-menu { display:none; position:fixed;top:50%;left:50%;transform:translate(-50%,-50%);
background:rgba(255,255,255,.9);backdrop-filter:blur(20px);border:1px solid rgba(255,255,255,.3);border-radius:20px;padding:28px;box-shadow:var(--shadow-lg);z-index:1000;
min-width:320px;max-width:90vw;max-height:80vh;overflow-y:auto;}
.dark-mode .popup-menu { background:rgba(30,41,59,.95); border:1px solid rgba(51,65,85,.3);}
.popup-menu.active { display:block;animation:popupSlideIn .3s ease;}
@keyframes popupSlideIn {from{opacity:0;transform:translate(-50%,-48%);}to{opacity:1;transform:translate(-50%,-50%);}}
.popup-overlay { display:none;position:fixed;top:0;left:0;right:0;bottom:0;background:rgba(0,0,0,.6);backdrop-filter:blur(4px);z-index:999;}
.popup-overlay.active { display:block;animation:fadeIn .3s ease;}
@keyframes fadeIn { from {opacity:0;} to {opacity:1;} }
.popup-content { display: flex; flex-direction: column; gap: 12px;}
.popup-header { display: flex; justify-content: space-between; align-items:center;margin-bottom:20px;padding-bottom:16px;border-bottom:2px solid var(--border-color);}
.popup-header h3 { font-size: 1.25rem; font-weight: 700;}
.close-popup { background: var(--card-bg); border: 1px solid var(--border-color); color: var(--text-color); cursor:pointer;
font-size:1.2rem;padding:8px;border-radius:10px;transition:.3s;width:36px;height:36px;display:flex;align-items:center;justify-content:center;}
.close-popup:hover { background:var(--accent-color);color:white;transform:rotate(90deg);}
@media (max-width:768px) {
.input-section { grid-template-columns:1fr; }
.grid { grid-template-columns:1fr; }
.header { flex-direction:column;gap:16px;text-align:center;}
.header h1 { font-size:1.5rem; }
.actions { flex-wrap:wrap;justify-content:center; }
}
@media print {
.no-print { display:none!important; }
body { padding:0;background:white; }
.dashboard { margin-top:0; }
.chart-container,.stat-card { break-inside:avoid;page-break-inside:avoid;box-shadow:none;}
}
::-webkit-scrollbar { width:10px; height:10px; }
::-webkit-scrollbar-track { background:var(--bg-color); }
::-webkit-scrollbar-thumb { background:var(--border-color); border-radius:5px;}
::-webkit-scrollbar-thumb:hover { background:var(--accent-color);}
.tips { margin-bottom: 18px; font-size: 1rem; padding: 10px 18px; background: var(--card-bg); border-left: 4px solid var(--accent-color); border-radius: 10px; box-shadow: var(--shadow-sm);}
</style>
</head>
<body>
<div class="container" aria-label="Dashboard">
<div class="header no-print" role="banner">
<h1>JSON 2 Dashboard</h1>
<div class="actions" aria-label="Global Actions">
<button onclick="toggleTheme()" class="theme-toggle" title="Toggle dark mode" aria-label="Toggle theme">
<i class="fas fa-sun"></i>
</button>
<button onclick="toggleChartMenu()" class="action-btn" title="Show/Hide Charts" aria-label="Chart controls">
<i class="fas fa-chart-line"></i> Charts
</button>
<button onclick="downloadPDF()" class="action-btn" title="Download PDF" aria-label="Download as PDF">
<i class="fas fa-file-pdf"></i> PDF
</button>
<button onclick="printDashboard()" class="action-btn" title="Print dashboard" aria-label="Print dashboard">
<i class="fas fa-print"></i> Print
</button>
</div>
</div>
<div class="tips no-print">
<strong>Tips:</strong>
Paste or upload <span title="Flat, Nested, Array, Mixed">any valid JSON data</span>. <br>
Dashboard intelligently validates and adapts. <br>
Use <b>Chart Controls</b> to show/hide charts. <br>
<b>Export</b> as PDF or print directly.
</div>
<div class="input-section no-print">
<div class="upload-section">
<h3><i class="fas fa-upload"></i> Upload JSON File</h3>
<input type="file" id="fileInput" accept=".json" aria-label="Upload JSON" tabindex="1">
<button onclick="handleFileUploadClick()" class="run-btn" aria-label="Run analysis for upload" tabindex="2">
<i class="fas fa-play"></i> Run Analysis
</button>
</div>
<div class="json-input-section">
<h3><i class="fas fa-code"></i> Paste JSON Data</h3>
<textarea id="jsonInput" class="json-input" placeholder='Paste your JSON data here...' aria-label="Paste JSON" tabindex="3"></textarea>
<button onclick="handleJsonInput()" class="run-btn" aria-label="Run analysis for text" tabindex="4">
<i class="fas fa-play"></i> Run Analysis
</button>
</div>
</div>
<div id="statusMsg" role="status"></div>
<div class="dashboard">
<div id="summaryStats"></div>
<div class="grid" id="chartsGrid"></div>
</div>
</div>
<!-- Popup menu -->
<div class="popup-overlay" onclick="toggleChartMenu()" aria-label="Close chart controls"></div>
<div class="popup-menu" aria-modal="true" aria-label="Chart settings">
<div class="popup-header">
<h3>Toggle Charts</h3>
<button class="close-popup" onclick="toggleChartMenu()" aria-label="Close">
<i class="fas fa-times"></i>
</button>
</div>
<div class="popup-content" id="chartToggles"></div>
</div>
<script>
// Chart configurations
const chartConfigs = {
pieChart: { title: 'Distribution', visible: true },
barChart: { title: 'Comparison', visible: true },
lineChart: { title: 'Trend', visible: true },
scatterChart: { title: 'Correlation', visible: true },
boxPlot: { title: 'Distribution Analysis', visible: true },
heatmap: { title: 'Correlation Matrix', visible: true }
};
function loadChartPreferences() {
const savedPrefs = localStorage.getItem('chartPreferences');
if (savedPrefs) {
const prefs = JSON.parse(savedPrefs);
Object.keys(chartConfigs).forEach(chart => {
if (prefs[chart] !== undefined)
chartConfigs[chart].visible = prefs[chart];
});
}
updateChartToggles();
}
function saveChartPreferences() {
const prefs = {};
Object.keys(chartConfigs).forEach(chart => {
prefs[chart] = chartConfigs[chart].visible;
});
localStorage.setItem('chartPreferences', JSON.stringify(prefs));
}
function updateChartToggles() {
const container = document.getElementById('chartToggles');
container.innerHTML = Object.entries(chartConfigs)
.map(([id, config]) => `
<label class="chart-toggle">
<input type="checkbox"
${config.visible ? 'checked' : ''}
onchange="toggleChart('${id}', this.checked)">
${config.title}
</label>
`).join('');
}
function toggleChart(chartId, visible) {
chartConfigs[chartId].visible = visible;
saveChartPreferences();
// Hide/show chart container
if (window.hasData) {
const el = document.getElementById(chartId);
if (el) el.closest('.chart-container').style.display = visible ? 'block' : 'none';
}
}
function loadTheme() {
const isDark = localStorage.getItem('darkMode') === 'true';
document.body.classList.toggle('dark-mode', isDark);
updateThemeIcon();
if (window.hasData) updateChartsTheme();
}
function toggleTheme() {
document.body.classList.toggle('dark-mode');
localStorage.setItem('darkMode', document.body.classList.contains('dark-mode'));
updateThemeIcon();
if (window.hasData) updateChartsTheme();
}
function updateThemeIcon() {
const isDark = document.body.classList.contains('dark-mode');
document.querySelectorAll('.theme-toggle i')
.forEach(icon => icon.className = isDark ? 'fas fa-moon' : 'fas fa-sun');
}
function downloadPDF() {
const dashboard = document.querySelector('.dashboard');
const opt = {
margin: 0.5,
filename: 'dashboard.pdf',
image: { type: 'jpeg', quality: 1 },
html2canvas: { scale: 2, useCORS: true, logging: false, letterRendering: true },
jsPDF: { unit: 'in', format: 'a4', orientation: 'landscape' },
pagebreak: { mode: ['avoid-all'] }
};
html2pdf().set(opt).from(dashboard).save();
}
function printDashboard() { window.print(); }
function updateChartsTheme() {
const isDark = document.body.classList.contains('dark-mode');
const layout = {
paper_bgcolor: isDark ? '#1e293b' : '#ffffff',
plot_bgcolor: isDark ? '#1e293b' : '#ffffff',
font: { color: isDark ? '#f1f5f9' : '#1a202c' }
};
Object.keys(chartConfigs).forEach(chartId => {
const chart = document.getElementById(chartId);
if (chart?.data) Plotly.relayout(chartId, layout);
});
}
// Data handling
function showStatusMsg(msg, isError) {
const el = document.getElementById('statusMsg');
el.style.color = isError ? '#e53e3e' : '#2563eb';
el.innerHTML = msg;
}
function handleFileUploadClick() {
const fileInput = document.getElementById('fileInput');
if (fileInput.files.length > 0) {
handleFileUpload(fileInput.files[0]);
} else {
showStatusMsg('Please select a file first', true);
}
}
function handleJsonInput() {
const jsonInput = document.getElementById('jsonInput');
let val = jsonInput.value;
try {
const data = JSON.parse(val);
const analysis = analyzeData(data);
if (analysis) {
showStatusMsg('JSON loaded successfully.', false);
createVisualizations(analysis);
} else {
showStatusMsg('Invalid data structure. Please provide an array or object containing arrays.', true);
}
} catch (error) {
showStatusMsg('Invalid JSON: ' + error.message, true);
}
}
function handleFileUpload(file) {
const reader = new FileReader();
reader.onload = function(e) {
try {
const data = JSON.parse(e.target.result);
const analysis = analyzeData(data);
if (analysis) {
showStatusMsg('JSON loaded successfully.', false);
createVisualizations(analysis);
} else {
showStatusMsg('Invalid data structure. Please provide an array or object containing arrays.', true);
}
} catch (error) {
showStatusMsg('Error parsing JSON file: ' + error.message, true);
}
};
reader.readAsText(file);
}
// Wide-format & robust JSON autodetect/analyze
function analyzeData(data) {
// Accept array, or object containing array, or array of objects, even mixed keys.
let arr = Array.isArray(data) ? data : null;
if (!arr) {
// Try object keys whose value is array
for (const key in data) {
if (Array.isArray(data[key])) { arr = data[key]; break; }
}
}
if (!arr || !Array.isArray(arr) || arr.length === 0) return null;
// Get all possible/nesting keys (1-level only)
let keys = [];
arr.forEach(obj => {
if (typeof obj === 'object' && obj !== null) {
keys = keys.concat(Object.keys(flattenObj(obj)));
}
});
keys = Array.from(new Set(keys));
const analysis = {};
keys.forEach(key => {
// Get values, support flattening for nested keys (using flattenObj)
const values = arr.map(obj => flattenObj(obj)[key]);
// Ignore undefined for all
let valid = values.filter(v => v !== undefined);
if (valid.length === 0) return;
// Detect type: number, string, boolean, other
const first = valid[0];
const type = typeof first;
if (type === 'number') {
const sorted = [...valid].sort((a,b)=>a-b);
analysis[key] = {
type: 'number',
values: valid,
sum: valid.reduce((a,b)=>a+b,0),
avg: valid.reduce((a,b)=>a+b,0) / valid.length,
min: Math.min(...valid),
max: Math.max(...valid),
median: sorted[Math.floor(sorted.length/2)] ?? null
};
} else if (type === 'string' || type === 'boolean') {
const freq = {};
valid.forEach(v => freq[v]= (freq[v]||0)+1);
analysis[key] = {
type: type,
values: valid,
frequencies: freq,
unique: Object.keys(freq).length,
most: Object.entries(freq).sort((a,b)=>b[1]-a[1])[0]?.[0]
};
}
});
// If nothing found, invalid
return Object.keys(analysis).length ? analysis : null;
}
// Helper: Flatten one-level nested object (for "user.name", "metrics.score")
function flattenObj(obj, prefix = '') {
let res = {};
for (const k in obj) {
if (typeof obj[k] === 'object' && obj[k] !== null && !Array.isArray(obj[k])) {
const flat = flattenObj(obj[k], prefix + k + '.');
Object.assign(res, flat);
} else res[prefix + k] = obj[k];
}
return res;
}
function createVisualizations(analysis) {
window.hasData = true;
// Default to all visible
Object.keys(chartConfigs).forEach(id => chartConfigs[id].visible = true);
saveChartPreferences();
updateChartToggles();
// Build summary cards
const summaryHTML = [];
for (const [key, value] of Object.entries(analysis)) {
if (value.type === 'number') {
summaryHTML.push(`
<div class="stat-card">
<h3>${key}</h3>
<p><strong>Sum:</strong> ${value.sum?.toFixed(2) ?? '-'}</p>
<p><strong>Average:</strong> ${value.avg?.toFixed(2) ?? '-'}</p>
<p><strong>Min:</strong> ${value.min ?? '-'}</p>
<p><strong>Max:</strong> ${value.max ?? '-'}</p>
<p><strong>Median:</strong> ${value.median ?? '-'}</p>
</div>
`);
} else if (value.type === 'string' || value.type === 'boolean') {
summaryHTML.push(`
<div class="stat-card">
<h3>${key}</h3>
<p><strong>Unique:</strong> ${value.unique}</p>
<p><strong>Most Common:</strong> ${value.most}</p>
</div>
`);
}
}
document.getElementById('summaryStats').innerHTML = summaryHTML.join('');
// Prepare chart grid
const chartsGrid = document.getElementById('chartsGrid');
chartsGrid.innerHTML = Object.keys(chartConfigs)
.map(id => `
<div class="chart-container" style="display:${chartConfigs[id].visible?'block':'none'}">
<div id="${id}"></div>
</div>
`).join('');
// Find fields for charts
const categoricalFields = Object.entries(analysis)
.filter(([_,v])=>v.type==='string').map(([k,_])=>k);
const numericalFields = Object.entries(analysis)
.filter(([_,v])=>v.type==='number').map(([k,_])=>k);
// Pie Chart (categorical)
if (categoricalFields.length) {
const field = categoricalFields[0];
const { frequencies } = analysis[field];
Plotly.newPlot('pieChart', [{
values: Object.values(frequencies),
labels: Object.keys(frequencies),
type: 'pie',
marker: { colors:['#667eea','#764ba2','#f093fb','#f5576c','#4facfe','#00f2fe'] }
}], { paper_bgcolor: getBg(), plot_bgcolor:getBg(), font:{color:getFont()}, title: `Distribution of ${field}` });
// Bar Chart (next categorical)
const field2 = categoricalFields[1]||categoricalFields[0];
Plotly.newPlot('barChart', [{
x: Object.keys(analysis[field2].frequencies),
y: Object.values(analysis[field2].frequencies),
type: 'bar', marker:{color:'#667eea'}
}], { paper_bgcolor:getBg(), plot_bgcolor:getBg(), font:{color:getFont()}, title:`Count by ${field2}` });
}
// Line Chart (numerical)
if (numericalFields.length) {
const field = numericalFields[0];
Plotly.newPlot('lineChart', [{
y: analysis[field].values,
type: 'scatter', mode:'lines+markers', line:{color:'#667eea',width:3}, marker:{color:'#764ba2',size:8}
}],{paper_bgcolor:getBg(), plot_bgcolor:getBg(), font:{color:getFont()}, title:`Trend of ${field}`});
// Boxplot
Plotly.newPlot('boxPlot', numericalFields.map((f,i)=>({
y: analysis[f].values, type:'box', name:f, marker:{color:['#667eea','#764ba2','#f093fb','#f5576c'][i%4]}
})),{paper_bgcolor:getBg(), plot_bgcolor:getBg(),font:{color:getFont()}, title:'Distribution Analysis'});
// Scatter Chart (2 nums)
if (numericalFields.length>=2) {
Plotly.newPlot('scatterChart',[{
x: analysis[numericalFields[0]].values,
y: analysis[numericalFields[1]].values,
mode:'markers', type:'scatter', marker:{color:'#667eea',size:10,opacity:.6}
}],{paper_bgcolor:getBg(), plot_bgcolor:getBg(), font:{color:getFont()}, title:`${numericalFields[0]} vs ${numericalFields[1]}`, xaxis:{title:numericalFields[0]},yaxis:{title:numericalFields[1]}});
// Heatmap for correlation
const corrMatrix = numericalFields.map(f1 =>
numericalFields.map(f2 => calcCorr(analysis[f1].values,analysis[f2].values)));
Plotly.newPlot('heatmap',[{
z: corrMatrix, x:numericalFields, y:numericalFields,
type:'heatmap', colorscale:'Viridis'
}],{paper_bgcolor:getBg(),plot_bgcolor:getBg(),font:{color:getFont()}, title:'Correlation Matrix'});
}
}
}
function getBg() { return document.body.classList.contains('dark-mode')?'#1e293b':'#ffffff'; }
function getFont() { return document.body.classList.contains('dark-mode')?'#f1f5f9':'#1a202c'; }
function toggleChartMenu() {
document.querySelector('.popup-overlay').classList.toggle('active');
document.querySelector('.popup-menu').classList.toggle('active');
}
function calcCorr(x, y) {
const n = x.length;
if (y.length !== n || n < 2) return 0;
const sum_x = x.reduce((a, b) => a + b, 0),
sum_y = y.reduce((a, b) => a + b, 0),
sum_xy = x.reduce((a, b, i) => a + b * y[i], 0),
sum_x2 = x.reduce((a, b) => a + b * b, 0),
sum_y2 = y.reduce((a, b) => a + b * b, 0);
const numerator = n * sum_xy - sum_x * sum_y,
denominator = Math.sqrt((n * sum_x2 - sum_x * sum_x) * (n * sum_y2 - sum_y * sum_y));
return denominator === 0 ? 0 : numerator / denominator;
}
// Accessibility focus
window.addEventListener('keydown', e => {
if (e.key === 'Escape') { toggleChartMenu(); }
});
// Init
loadTheme();
loadChartPreferences();
updateChartToggles();
</script>
</body>
</html>