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document.addEventListener('DOMContentLoaded', function() {
// --- Exports by Country Tab Logic ---
// --- Imports by Country Tab Logic ---
// --- Exports by Product Tab Logic ---
// --- Imports by Product Tab Logic ---
// --- Rankings Tab Logic ---
// --- Bilateral Trade Tab Logic ---
// --- Data Download Tab Logic ---
const dataDownloadForm = document.getElementById('dataDownloadForm');
const dataDownloadStatus = document.getElementById('dataDownloadStatus');
const dataDownloadChartDiv = document.createElement('div');
dataDownloadChartDiv.id = 'dataDownloadChart';
dataDownloadChartDiv.style.marginTop = '2em';
dataDownloadStatus && dataDownloadStatus.parentNode.insertBefore(dataDownloadChartDiv, dataDownloadStatus.nextSibling);
let dataDownloadChartData = null;
if (dataDownloadForm) {
dataDownloadForm.addEventListener('submit', async function(e) {
e.preventDefault();
dataDownloadStatus.innerHTML = '';
dataDownloadChartDiv.innerHTML = '';
// ...existing fetch logic...
// After successful data fetch:
// dataDownloadChartData = fetchedData;
// renderDataDownloadChart(fetchedData);
});
}
// Render chart for Data Download tab (all rows)
// Generalized chart rendering for any tab
function renderModernChart(rows, chartDivId) {
const chartDiv = document.getElementById(chartDivId);
if (!chartDiv || !Array.isArray(rows) || rows.length === 0) return;
chartDiv.innerHTML = '';
const canvas = document.createElement('canvas');
canvas.width = Math.min(900, window.innerWidth * 0.96);
canvas.height = 340;
canvas.style.background = '#fff';
canvas.style.borderRadius = '10px';
canvas.style.boxShadow = '0 2px 10px rgba(25,118,210,0.07)';
chartDiv.appendChild(canvas);
const ctx = canvas.getContext('2d');
// Try to find year and value columns
let years = [], values = [];
if (rows[0].year !== undefined && rows[0].value !== undefined) {
years = rows.map(r => +r.year);
values = rows.map(r => +r.value);
} else if (rows[0].hasOwnProperty('country') && rows[0].hasOwnProperty('value')) {
// For country rankings
years = rows.map((_, i) => i+1); // Rank as x-axis
values = rows.map(r => +r.value);
} else if (rows[0].hasOwnProperty('cmdCode') && rows[0].hasOwnProperty('value')) {
// For product by code
years = rows.map((_, i) => i+1);
values = rows.map(r => +r.value);
} else {
return;
}
const minYear = Math.min(...years), maxYear = Math.max(...years);
const minVal = Math.min(...values), maxVal = Math.max(...values);
// Draw grid
ctx.strokeStyle = '#e3e9f6';
ctx.lineWidth = 1;
for (let i = 0; i <= 5; ++i) {
let y = 40 + i * (260 / 5);
ctx.beginPath();
ctx.moveTo(60, y);
ctx.lineTo(canvas.width - 30, y);
ctx.stroke();
}
// Axes
ctx.strokeStyle = '#1976d2';
ctx.lineWidth = 2;
ctx.beginPath();
ctx.moveTo(60, 40);
ctx.lineTo(60, 300);
ctx.lineTo(canvas.width - 30, 300);
ctx.stroke();
// Y labels
ctx.fillStyle = '#34495e';
ctx.font = '13px Segoe UI, Arial, sans-serif';
for (let i = 0; i <= 5; ++i) {
let v = minVal + (maxVal - minVal) * i / 5;
let y = 300 - (v - minVal) / (maxVal - minVal) * 260;
ctx.fillText(v.toFixed(0), 10, y + 4);
}
// X labels
for (let i = 0; i < years.length; ++i) {
let x = 60 + (years[i] - minYear) / (maxYear - minYear || 1) * (canvas.width - 90);
let label = (rows[0].country && rows[i].country) ? rows[i].country : (rows[0].cmdCode && rows[i].cmdCode ? rows[i].cmdCode : years[i]);
ctx.fillText(label, x - 12, 320);
}
// Draw line
ctx.strokeStyle = '#42a5f5';
ctx.lineWidth = 3;
ctx.beginPath();
for (let i = 0; i < years.length; ++i) {
let x = 60 + (years[i] - minYear) / (maxYear - minYear || 1) * (canvas.width - 90);
let y = 300 - (values[i] - minVal) / (maxVal - minVal || 1) * 260;
if (i === 0) ctx.moveTo(x, y);
else ctx.lineTo(x, y);
}
ctx.stroke();
// Draw points
for (let i = 0; i < years.length; ++i) {
let x = 60 + (years[i] - minYear) / (maxYear - minYear || 1) * (canvas.width - 90);
let y = 300 - (values[i] - minVal) / (maxVal - minVal || 1) * 260;
ctx.beginPath();
ctx.arc(x, y, 5, 0, 2 * Math.PI);
ctx.fillStyle = '#1976d2';
ctx.fill();
}
// Tooltip (simple hover)
canvas.onmousemove = function(ev) {
const rect = canvas.getBoundingClientRect();
const mx = ev.clientX - rect.left, my = ev.clientY - rect.top;
let found = -1;
for (let i = 0; i < years.length; ++i) {
let x = 60 + (years[i] - minYear) / (maxYear - minYear || 1) * (canvas.width - 90);
let y = 300 - (values[i] - minVal) / (maxVal - minVal || 1) * 260;
if (Math.abs(mx - x) < 8 && Math.abs(my - y) < 8) { found = i; break; }
}
chartDiv.querySelectorAll('.chart-tooltip').forEach(e => e.remove());
if (found !== -1) {
const tip = document.createElement('div');
tip.className = 'chart-tooltip';
tip.style.position = 'absolute';
tip.style.left = (mx + 10) + 'px';
tip.style.top = (my + 10) + 'px';
tip.style.background = '#fff';
tip.style.border = '1px solid #1976d2';
tip.style.borderRadius = '6px';
tip.style.padding = '6px 12px';
tip.style.boxShadow = '0 2px 8px rgba(25,118,210,0.15)';
tip.style.pointerEvents = 'none';
tip.style.fontSize = '13px';
tip.style.zIndex = 1000;
tip.innerHTML = `<b>${(rows[found].country || rows[found].cmdCode || 'Year')}:</b> ${years[found]}<br><b>Value:</b> ${values[found]}`;
chartDiv.appendChild(tip);
}
};
canvas.onmouseleave = function() {
chartDiv.querySelectorAll('.chart-tooltip').forEach(e => e.remove());
};
}
// Backward compat: keep for Data Download tab
function renderDataDownloadChart(rows) {
renderModernChart(rows, 'dataDownloadChart');
}
const predictionForm = document.getElementById('predictionForm');
const predictionReporter = document.getElementById('predictionReporter');
const predictionPartner = document.getElementById('predictionPartner');
const predictionResults = document.getElementById('predictionResults');
const predictionChart = document.getElementById('predictionChart');
const predictionDownloadBtn = document.getElementById('predictionDownloadBtn');
let predictionTableData = null;
// Populate country dropdowns
if (predictionReporter && predictionPartner && typeof COUNTRY_CODES !== 'undefined') {
predictionReporter.innerHTML = '';
predictionPartner.innerHTML = '';
COUNTRY_CODES.forEach(c => {
const opt1 = document.createElement('option');
opt1.value = c.code;
opt1.textContent = c.name + ' (' + c.code + ')';
predictionReporter.appendChild(opt1);
const opt2 = document.createElement('option');
opt2.value = c.code;
opt2.textContent = c.name + ' (' + c.code + ')';
predictionPartner.appendChild(opt2);
});
}
if (predictionForm) {
predictionForm.addEventListener('submit', async function(e) {
e.preventDefault();
predictionResults.innerHTML = '';
predictionDownloadBtn.style.display = 'none';
if (predictionChart) predictionChart.style.display = 'none';
const reporterCode = predictionReporter.value;
const partnerCode = predictionPartner.value;
const year = document.getElementById('predictionYear').value;
const cmdCode = document.getElementById('predictionCommodity').value;
const modelType = document.getElementById('predictionModel').value;
const payload = {
reporterCode: reporterCode,
partnerCode: partnerCode,
period: year,
cmdCode: cmdCode,
flowCode: '',
modelType: modelType
};
predictionResults.innerHTML = '<div>Predicting...</div>';
showSpinner();
try {
const resp = await fetch('/api/predict', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.historical && data.prediction) {
// Prepare table data
let rows = [];
data.historical.forEach(row => {
rows.push({ year: row.year, value: row.value, type: 'historical' });
});
rows.push({ year: data.prediction.year, value: data.prediction.value, type: 'predicted' });
predictionTableData = rows;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr><th>Year</th><th>Value</th><th>Type</th></tr></thead><tbody>';
rows.forEach(row => {
html += `<tr><td>${row.year}</td><td>${row.value}</td><td>${row.type}</td></tr>`;
});
html += '</tbody></table></div>';
predictionResults.innerHTML = html;
predictionDownloadBtn.style.display = 'inline-block';
// Plot chart (vanilla JS, use Canvas API)
plotPredictionChart(rows);
} else {
predictionResults.innerHTML = '<div>No prediction data returned.</div>';
}
} catch (err) {
predictionResults.innerHTML = '<div>Error fetching prediction.</div>';
} finally {
hideSpinner();
}
});
predictionDownloadBtn.addEventListener('click', function() {
if (!predictionTableData) return;
let csv = 'Year,Value,Type\n';
predictionTableData.forEach(row => {
csv += `${row.year},${row.value},${row.type}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'trade_prediction.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
// Simple chart plotting function (vanilla JS, Canvas API)
function plotPredictionChart(rows) {
if (!predictionChart) return;
const width = 600, height = 320, pad = 50;
predictionChart.width = width;
predictionChart.height = height;
const ctx = predictionChart.getContext('2d');
ctx.clearRect(0, 0, width, height);
// Prepare data
const years = rows.map(r => +r.year);
const values = rows.map(r => +r.value);
const minYear = Math.min(...years), maxYear = Math.max(...years);
const minVal = Math.min(...values), maxVal = Math.max(...values);
// Axes
ctx.strokeStyle = '#888';
ctx.lineWidth = 1;
ctx.beginPath();
ctx.moveTo(pad, pad);
ctx.lineTo(pad, height-pad);
ctx.lineTo(width-pad, height-pad);
ctx.stroke();
// Y labels
ctx.fillStyle = '#444';
ctx.font = '13px sans-serif';
for (let i=0; i<=4; ++i) {
let v = minVal + (maxVal-minVal)*i/4;
let y = height-pad - (v-minVal)/(maxVal-minVal)*(height-2*pad);
ctx.fillText(v.toFixed(0), 6, y+4);
}
// X labels
for (let i=0; i<years.length; ++i) {
let x = pad + (years[i]-minYear)/(maxYear-minYear)*(width-2*pad);
ctx.fillText(years[i], x-10, height-pad+18);
}
// Plot historical
ctx.strokeStyle = '#1976d2';
ctx.lineWidth = 2;
ctx.beginPath();
for (let i=0; i<rows.length; ++i) {
if (rows[i].type !== 'historical') continue;
let x = pad + (rows[i].year-minYear)/(maxYear-minYear)*(width-2*pad);
let y = height-pad - (rows[i].value-minVal)/(maxVal-minVal)*(height-2*pad);
if (i===0) ctx.moveTo(x, y);
else ctx.lineTo(x, y);
}
ctx.stroke();
// Plot predicted
let pred = rows.find(r => r.type==='predicted');
if (pred) {
let x = pad + (pred.year-minYear)/(maxYear-minYear)*(width-2*pad);
let y = height-pad - (pred.value-minVal)/(maxVal-minVal)*(height-2*pad);
ctx.fillStyle = '#e53935';
ctx.beginPath();
ctx.arc(x, y, 7, 0, 2*Math.PI);
ctx.fill();
ctx.font = 'bold 14px sans-serif';
ctx.fillText('Prediction', x+10, y-10);
}
predictionChart.style.display = 'block';
}
// Already declared at the top:
// const dataDownloadForm = document.getElementById('dataDownloadForm');
const dataDownloadReporter = document.getElementById('dataDownloadReporter');
const dataDownloadPartner = document.getElementById('dataDownloadPartner');
// const dataDownloadStatus = document.getElementById('dataDownloadStatus');
if (dataDownloadReporter && typeof COUNTRY_CODES !== 'undefined') {
dataDownloadReporter.innerHTML = '<option value="">All</option>';
COUNTRY_CODES.forEach(c => {
const opt = document.createElement('option');
opt.value = c.code;
opt.textContent = c.name + ' (' + c.code + ')';
dataDownloadReporter.appendChild(opt);
});
}
if (dataDownloadPartner && typeof COUNTRY_CODES !== 'undefined') {
dataDownloadPartner.innerHTML = '<option value="">All</option>';
COUNTRY_CODES.forEach(c => {
const opt = document.createElement('option');
opt.value = c.code;
opt.textContent = c.name + ' (' + c.code + ')';
dataDownloadPartner.appendChild(opt);
});
}
if (dataDownloadForm) {
dataDownloadForm.addEventListener('submit', async function(e) {
e.preventDefault();
dataDownloadStatus.innerHTML = '';
const reporterCode = dataDownloadReporter.value;
const partnerCode = dataDownloadPartner.value;
const year = document.getElementById('dataDownloadYear').value;
const cmdCode = document.getElementById('dataDownloadCommodity').value;
const flowCode = document.getElementById('dataDownloadFlow').value;
// Determine all reporter/partner combos
let reporterList = reporterCode ? [reporterCode] : COUNTRY_CODES.map(c => c.code);
let partnerList = partnerCode ? [partnerCode] : COUNTRY_CODES.map(c => c.code);
// Prevent massive downloads (limit combos)
if (reporterList.length * partnerList.length > 200) {
dataDownloadStatus.innerHTML = '<div style="color:red;">Too many combinations selected! Please narrow your selection.</div>';
return;
}
dataDownloadStatus.innerHTML = '<div>Fetching data...</div>';
let allRows = [];
let columnsSet = new Set();
for (let r of reporterList) {
for (let p of partnerList) {
if (r === p) continue; // skip self-pairs
const payload = {
reporterCode: r,
partnerCode: p,
period: year,
cmdCode: cmdCode,
flowCode: flowCode
};
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
data.rows.forEach(row => {
allRows.push(row);
});
data.columns.forEach(col => columnsSet.add(col));
}
} catch (err) {
// skip errors
}
}
}
if (allRows.length === 0) {
dataDownloadStatus.innerHTML = '<div>No data found for your selection.</div>';
return;
}
// Build CSV
const columns = Array.from(columnsSet);
let csv = columns.join(',') + '\n';
allRows.forEach(row => {
csv += columns.map(col => row[col] !== undefined ? row[col] : '').join(',') + '\n';
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'custom_trade_data.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
dataDownloadStatus.innerHTML = '<div>Download started.</div>';
});
}
const bilateralForm = document.getElementById('bilateralForm');
const bilateralReporter = document.getElementById('bilateralReporter');
const bilateralPartner = document.getElementById('bilateralPartner');
const bilateralResults = document.getElementById('bilateralResults');
const bilateralDownloadBtn = document.getElementById('bilateralDownloadBtn');
let bilateralTableData = null;
// Populate both country dropdowns
if (bilateralReporter && bilateralPartner && typeof COUNTRY_CODES !== 'undefined') {
bilateralReporter.innerHTML = '';
bilateralPartner.innerHTML = '';
COUNTRY_CODES.forEach(c => {
const opt1 = document.createElement('option');
opt1.value = c.code;
opt1.textContent = c.name + ' (' + c.code + ')';
bilateralReporter.appendChild(opt1);
const opt2 = document.createElement('option');
opt2.value = c.code;
opt2.textContent = c.name + ' (' + c.code + ')';
bilateralPartner.appendChild(opt2);
});
}
if (bilateralForm) {
bilateralForm.addEventListener('submit', async function(e) {
e.preventDefault();
bilateralResults.innerHTML = '';
bilateralDownloadBtn.style.display = 'none';
const reporterCode = bilateralReporter.value;
const partnerCode = bilateralPartner.value;
const year = document.getElementById('bilateralYear').value;
const cmdCode = document.getElementById('bilateralCommodity').value;
const payload = {
reporterCode: reporterCode,
partnerCode: partnerCode,
period: year,
cmdCode: cmdCode,
flowCode: '' // Show all flows
};
bilateralResults.innerHTML = '<div>Loading bilateral trade data...</div>';
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
// Find value and flow columns
const valueCol = data.columns.includes('primaryValue') ? 'primaryValue' : (data.columns.includes('TradeValue') ? 'TradeValue' : (data.columns.includes('Value') ? 'Value' : null));
const flowCol = data.columns.includes('flowCode') ? 'flowCode' : (data.columns.includes('TradeFlow') ? 'TradeFlow' : null);
if (!valueCol) {
bilateralResults.innerHTML = '<div>No value column found.</div>';
return;
}
bilateralTableData = data.rows;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr>';
if (flowCol) html += '<th>Flow</th>';
html += '<th>Value</th></tr></thead><tbody>';
data.rows.forEach(row => {
html += '<tr>';
if (flowCol) html += `<td>${row[flowCol]}</td>`;
html += `<td>${row[valueCol]}</td></tr>`;
});
html += '</tbody></table></div>';
bilateralResults.innerHTML = html;
if (data.rows.length > 0) bilateralDownloadBtn.style.display = 'inline-block';
else bilateralDownloadBtn.style.display = 'none';
// Modern chart for Bilateral
renderModernChart(data.rows, 'bilateralChart');
} else {
bilateralResults.innerHTML = '<div>No data found for this country pair/year.</div>';
bilateralDownloadBtn.style.display = 'none';
}
} catch (err) {
bilateralResults.innerHTML = '<div>Error fetching data.</div>';
} finally {
hideSpinner();
}
});
bilateralDownloadBtn.addEventListener('click', function() {
if (!bilateralTableData) return;
let csv = 'Flow,Value\n';
bilateralTableData.forEach(row => {
csv += `${row.flowCode || row.TradeFlow || ''},${row.primaryValue || row.TradeValue || row.Value || ''}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'bilateral_trade.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
const rankingsForm = document.getElementById('rankingsForm');
const rankingsResults = document.getElementById('rankingsResults');
const rankingsDownloadBtn = document.getElementById('rankingsDownloadBtn');
let rankingsTableData = null;
if (rankingsForm) {
rankingsForm.addEventListener('submit', async function(e) {
e.preventDefault();
rankingsResults.innerHTML = '';
rankingsDownloadBtn.style.display = 'none';
const year = document.getElementById('rankingsYear').value;
const cmdCode = document.getElementById('rankingsCommodity').value;
const flowCode = document.getElementById('rankingsFlow').value;
// Fetch for all countries: iterate COUNTRY_CODES
const allPromises = COUNTRY_CODES.map(async country => {
const payload = {
reporterCode: country.code,
partnerCode: '0', // World
period: year,
cmdCode: cmdCode,
flowCode: flowCode
};
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
// Find the value column (primaryValue or TradeValue or Value)
const valueCol = data.columns.includes('primaryValue') ? 'primaryValue' : (data.columns.includes('TradeValue') ? 'TradeValue' : (data.columns.includes('Value') ? 'Value' : null));
const val = valueCol ? data.rows[0][valueCol] : null;
return {
country: country.name,
code: country.code,
value: val
};
} else {
return {
country: country.name,
code: country.code,
value: null
};
}
} catch (err) {
return {
country: country.name,
code: country.code,
value: null
};
}
});
rankingsResults.innerHTML = '<div>Loading data for all countries...</div>';
showSpinner();
const allResults = await Promise.all(allPromises);
hideSpinner();
// Filter for non-null values and sort descending
const filtered = allResults.filter(r => r.value !== null && r.value !== undefined).sort((a, b) => b.value - a.value);
rankingsTableData = filtered;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr><th>Country</th><th>Code</th><th>Value</th></tr></thead><tbody>';
filtered.forEach(row => {
html += `<tr><td>${row.country}</td><td>${row.code}</td><td>${row.value}</td></tr>`;
});
html += '</tbody></table></div>';
rankingsResults.innerHTML = html;
if (filtered.length > 0) rankingsDownloadBtn.style.display = 'inline-block';
else rankingsDownloadBtn.style.display = 'none';
// Modern chart for Rankings
renderModernChart(filtered, 'rankingsChart');
});
rankingsDownloadBtn.addEventListener('click', function() {
if (!rankingsTableData) return;
let csv = 'Country,Code,Value\n';
rankingsTableData.forEach(row => {
csv += `${row.country},${row.code},${row.value}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'rankings.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
const importsProductForm = document.getElementById('importsProductForm');
const importsProductCountry = document.getElementById('importsProductCountry');
const importsProductResults = document.getElementById('importsProductResults');
const importsProductDownloadBtn = document.getElementById('importsProductDownloadBtn');
let importsProductTableData = null;
// Populate country dropdown
if (importsProductCountry && typeof COUNTRY_CODES !== 'undefined') {
importsProductCountry.innerHTML = '';
COUNTRY_CODES.forEach(c => {
const opt = document.createElement('option');
opt.value = c.code;
opt.textContent = c.name + ' (' + c.code + ')';
importsProductCountry.appendChild(opt);
});
}
if (importsProductForm) {
importsProductForm.addEventListener('submit', async function(e) {
e.preventDefault();
importsProductResults.innerHTML = '';
importsProductDownloadBtn.style.display = 'none';
const reporterCode = importsProductCountry.value;
const year = document.getElementById('importsProductYear').value;
// Fetch for all products (HS codes) for this country/year
const payload = {
reporterCode: reporterCode,
partnerCode: '0', // World
period: year,
cmdCode: 'ALL', // Get all products
flowCode: 'M'
};
importsProductResults.innerHTML = '<div>Loading data for all products...</div>';
showSpinner();
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
// Find the product/HS code column
const hsCol = data.columns.includes('cmdCode') ? 'cmdCode' : (data.columns.includes('productCode') ? 'productCode' : null);
const descCol = data.columns.includes('cmdDescE') ? 'cmdDescE' : (data.columns.includes('productDesc') ? 'productDesc' : null);
const valueCol = data.columns.includes('primaryValue') ? 'primaryValue' : (data.columns.includes('TradeValue') ? 'TradeValue' : (data.columns.includes('Value') ? 'Value' : null));
if (!hsCol || !valueCol) {
importsProductResults.innerHTML = '<div>No product/value columns found.</div>';
return;
}
// Sort by value descending
const sorted = data.rows.slice().sort((a, b) => b[valueCol] - a[valueCol]);
importsProductTableData = sorted;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr><th>HS Code</th>';
if (descCol) html += '<th>Description</th>';
html += '<th>Value</th></tr></thead><tbody>';
sorted.forEach(row => {
html += `<tr><td>${row[hsCol]}</td>`;
if (descCol) html += `<td>${row[descCol]}</td>`;
html += `<td>${row[valueCol]}</td></tr>`;
});
html += '</tbody></table></div>';
importsProductResults.innerHTML = html;
// Modern chart for Imports by Product
renderModernChart(sorted, 'importsProductChart');
if (sorted.length > 0) importsProductDownloadBtn.style.display = 'inline-block';
else importsProductDownloadBtn.style.display = 'none';
} else {
importsProductResults.innerHTML = '<div>No data found for this country/year.</div>';
importsProductDownloadBtn.style.display = 'none';
}
} catch (err) {
importsProductResults.innerHTML = '<div>Error fetching data.</div>';
} finally {
hideSpinner();
}
});
importsProductDownloadBtn.addEventListener('click', function() {
if (!importsProductTableData) return;
let csv = 'HS Code,Description,Value\n';
importsProductTableData.forEach(row => {
csv += `${row.cmdCode || row.productCode || ''},${row.cmdDescE || row.productDesc || ''},${row.primaryValue || row.TradeValue || row.Value || ''}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'imports_by_product.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
const exportsProductForm = document.getElementById('exportsProductForm');
const exportsProductCountry = document.getElementById('exportsProductCountry');
const exportsProductResults = document.getElementById('exportsProductResults');
const exportsProductDownloadBtn = document.getElementById('exportsProductDownloadBtn');
let exportsProductTableData = null;
// Populate country dropdown
if (exportsProductCountry && typeof COUNTRY_CODES !== 'undefined') {
exportsProductCountry.innerHTML = '';
COUNTRY_CODES.forEach(c => {
const opt = document.createElement('option');
opt.value = c.code;
opt.textContent = c.name + ' (' + c.code + ')';
exportsProductCountry.appendChild(opt);
});
}
if (exportsProductForm) {
exportsProductForm.addEventListener('submit', async function(e) {
e.preventDefault();
exportsProductResults.innerHTML = '';
exportsProductDownloadBtn.style.display = 'none';
const reporterCode = exportsProductCountry.value;
const year = document.getElementById('exportsProductYear').value;
// Fetch for all products (HS codes) for this country/year
const payload = {
reporterCode: reporterCode,
partnerCode: '0', // World
period: year,
cmdCode: 'ALL', // Get all products
flowCode: 'X'
};
exportsProductResults.innerHTML = '<div>Loading data for all products...</div>';
showSpinner();
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
// Find the product/HS code column
const hsCol = data.columns.includes('cmdCode') ? 'cmdCode' : (data.columns.includes('productCode') ? 'productCode' : null);
const descCol = data.columns.includes('cmdDescE') ? 'cmdDescE' : (data.columns.includes('productDesc') ? 'productDesc' : null);
const valueCol = data.columns.includes('primaryValue') ? 'primaryValue' : (data.columns.includes('TradeValue') ? 'TradeValue' : (data.columns.includes('Value') ? 'Value' : null));
if (!hsCol || !valueCol) {
exportsProductResults.innerHTML = '<div>No product/value columns found.</div>';
return;
}
// Sort by value descending
const sorted = data.rows.slice().sort((a, b) => b[valueCol] - a[valueCol]);
exportsProductTableData = sorted;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr><th>HS Code</th>';
if (descCol) html += '<th>Description</th>';
html += '<th>Value</th></tr></thead><tbody>';
sorted.forEach(row => {
html += `<tr><td>${row[hsCol]}</td>`;
if (descCol) html += `<td>${row[descCol]}</td>`;
html += `<td>${row[valueCol]}</td></tr>`;
});
html += '</tbody></table></div>';
exportsProductResults.innerHTML = html;
// Modern chart for Exports by Product
renderModernChart(sorted, 'exportsProductChart');
if (sorted.length > 0) exportsProductDownloadBtn.style.display = 'inline-block';
else exportsProductDownloadBtn.style.display = 'none';
} else {
exportsProductResults.innerHTML = '<div>No data found for this country/year.</div>';
exportsProductDownloadBtn.style.display = 'none';
}
} catch (err) {
exportsProductResults.innerHTML = '<div>Error fetching data.</div>';
} finally {
hideSpinner();
}
});
exportsProductDownloadBtn.addEventListener('click', function() {
if (!exportsProductTableData) return;
let csv = 'HS Code,Description,Value\n';
exportsProductTableData.forEach(row => {
csv += `${row.cmdCode || row.productCode || ''},${row.cmdDescE || row.productDesc || ''},${row.primaryValue || row.TradeValue || row.Value || ''}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'exports_by_product.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
const importsCountryForm = document.getElementById('importsCountryForm');
const importsCountryResults = document.getElementById('importsCountryResults');
const importsCountryDownloadBtn = document.getElementById('importsCountryDownloadBtn');
let importsCountryTableData = null;
if (importsCountryForm) {
importsCountryForm.addEventListener('submit', async function(e) {
e.preventDefault();
importsCountryResults.innerHTML = '';
importsCountryDownloadBtn.style.display = 'none';
const year = document.getElementById('importsCountryYear').value;
const cmdCode = document.getElementById('importsCountryCommodity').value;
const flowCode = document.getElementById('importsCountryFlow').value;
// Fetch for all countries: iterate COUNTRY_CODES
const allPromises = COUNTRY_CODES.map(async country => {
const payload = {
reporterCode: country.code,
partnerCode: '0', // World
period: year,
cmdCode: cmdCode,
flowCode: flowCode
};
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
// Find the value column (primaryValue or TradeValue or Value)
const valueCol = data.columns.includes('primaryValue') ? 'primaryValue' : (data.columns.includes('TradeValue') ? 'TradeValue' : (data.columns.includes('Value') ? 'Value' : null));
const val = valueCol ? data.rows[0][valueCol] : null;
return {
country: country.name,
code: country.code,
value: val
};
} else {
return {
country: country.name,
code: country.code,
value: null
};
}
} catch (err) {
return {
country: country.name,
code: country.code,
value: null
};
}
});
importsCountryResults.innerHTML = '<div>Loading data for all countries...</div>';
const allResults = await Promise.all(allPromises);
// Filter for non-null values and sort descending
const filtered = allResults.filter(r => r.value !== null && r.value !== undefined).sort((a, b) => b.value - a.value);
importsCountryTableData = filtered;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr><th>Country</th><th>Code</th><th>Value</th></tr></thead><tbody>';
filtered.forEach(row => {
html += `<tr><td>${row.country}</td><td>${row.code}</td><td>${row.value}</td></tr>`;
});
html += '</tbody></table></div>';
importsCountryResults.innerHTML = html;
if (filtered.length > 0) importsCountryDownloadBtn.style.display = 'inline-block';
else importsCountryDownloadBtn.style.display = 'none';
// Modern chart for Imports by Country
renderModernChart(filtered, 'importsCountryChart');
});
importsCountryDownloadBtn.addEventListener('click', function() {
if (!importsCountryTableData) return;
let csv = 'Country,Code,Value\n';
importsCountryTableData.forEach(row => {
csv += `${row.country},${row.code},${row.value}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'imports_by_country.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
const exportsCountryForm = document.getElementById('exportsCountryForm');
const exportsCountryResults = document.getElementById('exportsCountryResults');
const exportsCountryDownloadBtn = document.getElementById('exportsCountryDownloadBtn');
let exportsCountryTableData = null;
if (exportsCountryForm) {
exportsCountryForm.addEventListener('submit', async function(e) {
e.preventDefault();
exportsCountryResults.innerHTML = '';
exportsCountryDownloadBtn.style.display = 'none';
const year = document.getElementById('exportsCountryYear').value;
const cmdCode = document.getElementById('exportsCountryCommodity').value;
const flowCode = document.getElementById('exportsCountryFlow').value;
// Fetch for all countries: iterate COUNTRY_CODES
const allPromises = COUNTRY_CODES.map(async country => {
const payload = {
reporterCode: country.code,
partnerCode: '0', // World
period: year,
cmdCode: cmdCode,
flowCode: flowCode
};
try {
const resp = await fetch('/api/trade', {
method: 'POST',
headers: { 'Content-Type': 'application/json' },
body: JSON.stringify(payload)
});
const data = await resp.json();
if (data && data.rows && data.rows.length > 0) {
// Find the value column (primaryValue or TradeValue or Value)
const valueCol = data.columns.includes('primaryValue') ? 'primaryValue' : (data.columns.includes('TradeValue') ? 'TradeValue' : (data.columns.includes('Value') ? 'Value' : null));
const val = valueCol ? data.rows[0][valueCol] : null;
return {
country: country.name,
code: country.code,
value: val
};
} else {
return {
country: country.name,
code: country.code,
value: null
};
}
} catch (err) {
return {
country: country.name,
code: country.code,
value: null
};
}
});
exportsCountryResults.innerHTML = '<div>Loading data for all countries...</div>';
const allResults = await Promise.all(allPromises);
// Filter for non-null values and sort descending
const filtered = allResults.filter(r => r.value !== null && r.value !== undefined).sort((a, b) => b.value - a.value);
exportsCountryTableData = filtered;
// Render table
let html = '<div style="overflow-x:auto;"><table><thead><tr><th>Country</th><th>Code</th><th>Value</th></tr></thead><tbody>';
filtered.forEach(row => {
html += `<tr><td>${row.country}</td><td>${row.code}</td><td>${row.value}</td></tr>`;
});
html += '</tbody></table></div>';
exportsCountryResults.innerHTML = html;
if (filtered.length > 0) exportsCountryDownloadBtn.style.display = 'inline-block';
else exportsCountryDownloadBtn.style.display = 'none';
// Modern chart for Exports by Country
renderModernChart(filtered, 'exportsCountryChart');
});
exportsCountryDownloadBtn.addEventListener('click', function() {
if (!exportsCountryTableData) return;
let csv = 'Country,Code,Value\n';
exportsCountryTableData.forEach(row => {
csv += `${row.country},${row.code},${row.value}\n`;
});
const blob = new Blob([csv], {type: 'text/csv'});
const url = URL.createObjectURL(blob);
const a = document.createElement('a');
a.href = url;
a.download = 'exports_by_country.csv';
document.body.appendChild(a);
a.click();
setTimeout(() => { document.body.removeChild(a); URL.revokeObjectURL(url); }, 100);
});
}
const form = document.getElementById('tradeForm');
const resultsDiv = document.getElementById('results');
const predictForm = document.getElementById('predictForm');
const predictionResult = document.getElementById('predictionResult');
const alertDiv = document.getElementById('alert');
const spinner = document.getElementById('spinner');
const tradeChart = document.getElementById('tradeChart');
let chartInstance = null;
function showAlert(msg, type='danger') {
alertDiv.style.display = 'block';
alertDiv.className = 'alert ' + (type === 'success' ? 'alert-success' : 'alert-danger');
alertDiv.textContent = msg;
}
function clearAlert() {
alertDiv.style.display = 'none';
alertDiv.textContent = '';
}
function showSpinner() { spinner.style.display = 'block'; }
function hideSpinner() { spinner.style.display = 'none'; }
function renderTable(columns, rows) {
let html = '<div style="overflow-x:auto;"><table><thead><tr>';
columns.forEach(col => html += `<th>${col}</th>`);
html += '</tr></thead><tbody>';
rows.forEach(row => {
html += '<tr>';
columns.forEach(col => html += `<td>${row[col]}</td>`);
html += '</tr>';
});
html += '</tbody></table></div>';
return html;
}
function renderChart(columns, rows) {
if (!tradeChart) return;
// Try to plot year vs primaryValue
const yearCol = columns.includes('year') ? 'year' : (columns.includes('refYear') ? 'refYear' : null);
const valueCol = columns.includes('primaryValue') ? 'primaryValue' : null;
if (!yearCol || !valueCol) { tradeChart.style.display = 'none'; return; }
const dataByYear = {};
rows.forEach(row => {
const y = row[yearCol] || row['refYear'];
const v = row[valueCol];
if (y && v) dataByYear[y] = v;
});
const years = Object.keys(dataByYear).sort();
const values = years.map(y => dataByYear[y]);
if (chartInstance) chartInstance.destroy();
chartInstance = new window.Chart(tradeChart.getContext('2d'), {
type: 'line',
data: {
labels: years,
datasets: [{
label: 'Trade Value',
data: values,
borderColor: '#3498db',
backgroundColor: 'rgba(52,152,219,0.2)',
fill: true
}]
},
options: { responsive: true, plugins: { legend: { display: false } } }
});
tradeChart.style.display = 'block';
}
// Initialize select2 on country dropdowns (after country list loads)
// --- World map visualization ---
let map = null;
let reporterMarker = null;
let partnerMarker = null;
let countryLatLng = {
'842': [38.0, -97.0], // USA
'156': [35.0, 103.0], // China
'392': [36.2, 138.2], // Japan
'826': [54.0, -2.0], // UK
'124': [56.1, -106.3], // Canada
'250': [46.6, 2.2], // France
'276': [51.2, 10.4], // Germany
'380': [41.9, 12.5], // Italy
'484': [23.6, -102.5], // Mexico
'356': [20.6, 78.9], // India
'643': [61.5, 105.3], // Russia
'710': [-30.6, 22.9], // South Africa
'036': [-25.3, 133.8], // Australia
'410': [36.5, 127.9], // South Korea
'704': [14.1, 108.3], // Vietnam
'458': [4.2, 101.9], // Malaysia
'554': [-40.9, 174.9], // New Zealand
'764': [15.8, 100.9], // Thailand
'344': [22.3, 114.2], // Hong Kong
};
function updateMap() {
if (!window.L || !document.getElementById('worldMap')) return;
if (!map) {
map = L.map('worldMap').setView([20, 0], 2);
L.tileLayer('https://{s}.tile.openstreetmap.org/{z}/{x}/{y}.png', {
attribution: 'OpenStreetMap contributors'
}).addTo(map);
}
// Remove old markers
if (reporterMarker) { map.removeLayer(reporterMarker); reporterMarker = null; }
if (partnerMarker) { map.removeLayer(partnerMarker); partnerMarker = null; }
// Add new markers
const reporterCode = document.getElementById('reporterCode').value;
const partnerCode = document.getElementById('partnerCode').value;
if (countryLatLng[reporterCode]) {
reporterMarker = L.marker(countryLatLng[reporterCode], {icon: L.icon({iconUrl:'https://cdn.jsdelivr.net/npm/leaflet@1.7.1/dist/images/marker-icon.png',iconSize:[25,41],iconAnchor:[12,41],popupAnchor:[1,-34],shadowUrl:'https://cdn.jsdelivr.net/npm/leaflet@1.7.1/dist/images/marker-shadow.png',shadowSize:[41,41]})}).addTo(map).bindPopup('Reporter Country');
}
if (countryLatLng[partnerCode]) {
partnerMarker = L.marker(countryLatLng[partnerCode], {icon: L.icon({iconUrl:'https://cdn.jsdelivr.net/npm/leaflet@1.7.1/dist/images/marker-icon-red.png',iconSize:[25,41],iconAnchor:[12,41],popupAnchor:[1,-34],shadowUrl:'https://cdn.jsdelivr.net/npm/leaflet@1.7.1/dist/images/marker-shadow.png',shadowSize:[41,41]})}).addTo(map).bindPopup('Partner Country');
}
}
document.getElementById('reporterCode').addEventListener('change', updateMap);
document.getElementById('partnerCode').addEventListener('change', updateMap);
setTimeout(updateMap, 1000); // Initial update after map loads
// Placeholder for extra visualizations
function showExtraVisualizations(data) {
const div = document.getElementById('extraVisualizations');
div.innerHTML = '<h3>Additional Visualizations (coming soon)</h3>';
}
clearAlert();
form.addEventListener('submit', async function(e) {
e.preventDefault();
clearAlert();
resultsDiv.innerHTML = '';
tradeChart.style.display = 'none';
showSpinner();
const formData = new FormData(form);
const data = {};
formData.forEach((value, key) => {
if (value !== '') data[key] = value;
});
try {
const response = await fetch('/api/trade', {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify(data)
});
const json = await response.json();
hideSpinner();
if (json.error) {
showAlert('Error: ' + json.error, 'danger');
resultsDiv.innerHTML = '';
} else if (!json.rows || json.rows.length === 0) {
showAlert('No data returned for these parameters.', 'danger');
resultsDiv.innerHTML = '';
} else {
showAlert('Data loaded successfully!', 'success');
resultsDiv.innerHTML = renderTable(json.columns, json.rows);
renderChart(json.columns, json.rows);
}
} catch (err) {
showAlert('Request failed: ' + err, 'danger');
resultsDiv.innerHTML = '';
} finally {
hideSpinner();
}
});
predictForm.addEventListener('submit', async function(e) {
e.preventDefault();
clearAlert();
predictionResult.innerHTML = '<p>Predicting...</p>';
// Gather parameters from both forms
const formData = new FormData(form);
const predictData = new FormData(predictForm);
const data = {};
formData.forEach((value, key) => { if (value !== '') data[key] = value; });
predictData.forEach((value, key) => { if (value !== '') data[key] = value; });
showSpinner();
try {
const response = await fetch('/api/predict', {
method: 'POST',
headers: {'Content-Type': 'application/json'},
body: JSON.stringify(data)
});
if (!response.ok) {
throw new Error(`HTTP error! Status: ${response.status}`);
}
const json = await response.json();
if (json.error) {
showAlert('Prediction error: ' + json.error, 'danger');
predictionResult.innerHTML = '';
} else if (json.prediction !== undefined) {
showAlert('Prediction successful! Model: ' + (json.model_type || 'N/A'), 'success');
// Format the prediction result
let predictionValue = typeof json.prediction === 'number' ?
json.prediction.toLocaleString(undefined, {maximumFractionDigits:2}) :
json.prediction;
// Get MSE value safely
let mseValue = json.mse !== undefined ?
(typeof json.mse === 'number' ? json.mse.toLocaleString(undefined, {maximumFractionDigits:2}) : json.mse) :
'N/A';
predictionResult.innerHTML = `<p><strong>Predicted Trade Value:</strong> ${predictionValue}<br><small>(Model: ${json.model_type || ''} | MSE: ${mseValue})</small></p>`;
// If we have historical data, plot a chart
if (json.historical && Array.isArray(json.historical)) {
// Prepare table data for chart
let rows = [];
json.historical.forEach(row => {
rows.push({ year: row.year, value: row.value, type: 'historical' });
});
rows.push({ year: json.prediction_year || predict_year, value: json.prediction, type: 'predicted' });
// Save for export
predictionTableData = rows;
// Display the download button
predictionDownloadBtn.style.display = 'inline-block';
// Plot the chart
plotPredictionChart(rows);
}
} else {
showAlert('No prediction data returned', 'danger');
predictionResult.innerHTML = '<div>No prediction data returned.</div>';
}
} catch (err) {
showAlert('Prediction failed: ' + err, 'danger');
predictionResult.innerHTML = '';
} finally {
hideSpinner();
}
});
// Load Chart.js dynamically if not present
if (!window.Chart) {
const script = document.createElement('script');
script.src = 'https://cdn.jsdelivr.net/npm/chart.js';
document.body.appendChild(script);
}
// ---- Tab Navigation Logic ----
const tabs = document.querySelectorAll('#main-tabs .tab');
const tabContents = document.querySelectorAll('.tab-content');
tabs.forEach((tab, idx) => {
tab.addEventListener('click', function() {
// Hide all spinners in all tab panels
document.querySelectorAll('.spinner').forEach(spinner => spinner.style.display = 'none');
hideSpinner(); // Also hide main spinner for good measure
tabs.forEach((t, i) => {
t.classList.remove('active');
t.setAttribute('aria-selected', 'false');
});
tab.classList.add('active');
tab.setAttribute('aria-selected', 'true');
const tabName = tab.getAttribute('data-tab');
tabContents.forEach(panel => {
if (panel.id === 'tab-content-' + tabName) {
panel.style.display = 'block';
} else {
panel.style.display = 'none';
}
});
tab.focus();
});
tab.addEventListener('keydown', function(e) {
if (e.key === 'ArrowRight') {
e.preventDefault();
tabs[(idx + 1) % tabs.length].focus();
} else if (e.key === 'ArrowLeft') {
e.preventDefault();
tabs[(idx - 1 + tabs.length) % tabs.length].focus();
} else if (e.key === 'Enter' || e.key === ' ') {
e.preventDefault();
tab.click();
}
});
});
});
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