init
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97f9a95415
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399
public/calculators/currency.js
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399
public/calculators/currency.js
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import {revive, persist, labelInput, labelSelect} from '/js/util.js';
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export default {
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id:'currency', name:'Currency Converter', about:'Convert between currencies using real-time exchange rates.',
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render(root){
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const key='calc_currency_v1';
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const s = revive(key,{amount:100, from:'USD', to:'EUR', manualRate: null});
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const ui = document.createElement('div');
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// Popular currencies with better formatting
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const currencies = [
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['USD', 'US Dollar'],
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['EUR', 'Euro'],
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['GBP', 'British Pound'],
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['JPY', 'Japanese Yen'],
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['CAD', 'Canadian Dollar'],
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['AUD', 'Australian Dollar'],
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['CHF', 'Swiss Franc'],
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['CNY', 'Chinese Yuan'],
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['INR', 'Indian Rupee'],
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['BRL', 'Brazilian Real']
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];
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// Create a more user-friendly form layout
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const formContainer = document.createElement('div');
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formContainer.style.cssText = `
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display: grid;
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grid-template-columns: 1fr 1fr;
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gap: 15px;
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margin-bottom: 20px;
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`;
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// Amount input (full width)
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const amountDiv = document.createElement('div');
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amountDiv.style.gridColumn = '1 / -1';
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amountDiv.innerHTML = `
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<label style="display: block; margin-bottom: 8px; font-weight: 500; color: var(--text);">
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Amount to Convert
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</label>
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<input type="number" name="amount" value="${s.amount}" step="0.01" min="0"
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style="width: 100%; padding: 12px; border: 1px solid var(--border); border-radius: 8px; font-size: 16px;"
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placeholder="Enter amount">
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`;
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// From currency (left column) - using Select Lite
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const fromDiv = document.createElement('div');
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fromDiv.innerHTML = `
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<label style="display: block; margin-bottom: 8px; font-weight: 500; color: var(--text);">
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From Currency
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</label>
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<select name="from" data-ui="lite" style="width: 100%;">
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${currencies.map(([code, name]) =>
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`<option value="${code}" ${code === s.from ? 'selected' : ''}>${code} - ${name}</option>`
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).join('')}
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</select>
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`;
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// To currency (right column) - using Select Lite
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const toDiv = document.createElement('div');
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toDiv.innerHTML = `
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<label style="display: block; margin-bottom: 8px; font-weight: 500; color: var(--text);">
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To Currency
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</label>
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<select name="to" data-ui="lite" style="width: 100%;">
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${currencies.map(([code, name]) =>
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`<option value="${code}" ${code === s.to ? 'selected' : ''}>${code} - ${name}</option>`
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).join('')}
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</select>
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`;
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formContainer.append(amountDiv, fromDiv, toDiv);
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ui.append(formContainer);
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// Manual rate input option
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const manualRateDiv = document.createElement('div');
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manualRateDiv.innerHTML = `
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<div style="margin: 15px 0; padding: 15px; border: 1px solid var(--border); border-radius: 8px; background: var(--k-bg);">
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<label style="display: block; margin-bottom: 8px; font-weight: 500; color: var(--text);">
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Custom Rate (Optional)
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</label>
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<input type="number" name="manualRate" placeholder="Enter custom conversion rate" step="0.0001" min="0"
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style="width: 100%; padding: 10px; border: 1px solid var(--border); border-radius: 6px; font-size: 14px;">
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<div style="font-size: 12px; color: var(--muted); margin-top: 8px; line-height: 1.4;">
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<strong>Format:</strong> 1 ${s.from} = X ${s.to}<br>
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<strong>Example:</strong> If 1 USD = 0.85 EUR, enter 0.85<br>
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<strong>Leave empty</strong> to use current market rates
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</div>
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</div>
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`;
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ui.append(manualRateDiv);
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// Fetch rates button with better styling
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const fetchBtn = document.createElement('button');
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fetchBtn.type = 'button';
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fetchBtn.textContent = 'Update Exchange Rates';
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fetchBtn.className = 'btn';
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fetchBtn.style.cssText = `
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width: 100%;
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padding: 12px;
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margin: 15px 0;
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font-size: 16px;
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font-weight: 500;
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background: var(--accent);
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color: white;
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border: none;
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border-radius: 8px;
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cursor: pointer;
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transition: background 0.2s;
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`;
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fetchBtn.addEventListener('mouseenter', () => fetchBtn.style.background = 'var(--accent-hover)');
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fetchBtn.addEventListener('mouseleave', () => fetchBtn.style.background = 'var(--accent)');
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ui.append(fetchBtn);
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const out = document.createElement('div');
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out.className = 'result';
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out.style.cssText = `
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margin: 20px 0;
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padding: 15px;
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background: var(--k-bg);
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border-radius: 8px;
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border-left: 4px solid var(--accent);
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`;
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ui.append(out);
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const status = document.createElement('div');
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status.className='status';
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ui.append(status);
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// Static rates from today (2025-09-01) - no prefetching
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const staticRates = {
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USD: 1,
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EUR: 0.856,
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GBP: 0.741,
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JPY: 147.15,
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CAD: 1.37,
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AUD: 1.53,
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CHF: 0.801,
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CNY: 7.13,
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INR: 88.19,
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BRL: 5.43
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};
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let rates = staticRates;
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let lastFetch = 0;
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const CACHE_DURATION = 5 * 60 * 1000; // 5 minutes
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// Function to get current static rate for currency pair
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function getCurrentStaticRate(from, to) {
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if (from === to) return 1;
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if (rates && rates[from] && rates[to]) {
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return rates[to] / rates[from];
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}
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return null;
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}
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// Function to update custom rate with current static rate
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function updateCustomRateWithStatic() {
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const from = ui.querySelector('[name=from]').value;
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const to = ui.querySelector('[name=to]').value;
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const staticRate = getCurrentStaticRate(from, to);
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if (staticRate !== null) {
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const manualRateInput = ui.querySelector('[name=manualRate]');
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// Update manual rate to current market rate when fetching new rates
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manualRateInput.value = staticRate.toFixed(4);
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manualRateInput.placeholder = `Current rate: ${staticRate.toFixed(4)}`;
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// Trigger calculation with the new rates
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calc();
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}
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}
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async function fetchRates(){
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const now = Date.now();
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if (rates && (now - lastFetch) < CACHE_DURATION) {
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status.textContent = 'Using cached rates (updated within 5 minutes)';
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status.className = 'status success';
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status.style.display = 'block';
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setTimeout(() => {
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status.textContent = '';
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status.style.display = 'none';
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}, 3000);
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return rates;
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}
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try {
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status.textContent = 'Fetching latest exchange rates...';
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status.className = 'status loading';
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const response = await fetch('https://api.exchangerate-api.com/v4/latest/USD');
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if (!response.ok) throw new Error('Failed to fetch rates');
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const data = await response.json();
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rates = data.rates;
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rates.USD = 1; // Base currency
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lastFetch = now;
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status.textContent = 'Rates updated successfully!';
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status.className = 'status success';
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status.style.display = 'block';
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setTimeout(() => {
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status.textContent = '';
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status.style.display = 'none';
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}, 1500);
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// Update custom rate with new rates and recalculate
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updateCustomRateWithStatic();
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return rates;
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} catch (error) {
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console.error('Failed to fetch exchange rates:', error);
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status.textContent = 'Failed to fetch rates. Using static rates from today.';
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status.className = 'status error';
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// Keep using static rates
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return rates;
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}
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}
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function calc(){
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const amount = +ui.querySelector('[name=amount]').value || 0;
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const from = ui.querySelector('[name=from]').value;
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const to = ui.querySelector('[name=to]').value;
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const manualRate = +ui.querySelector('[name=manualRate]').value || null;
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console.log('Calc function called with:', { amount, from, to, manualRate });
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if (amount <= 0) {
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out.innerHTML = '<div class="muted">Enter a positive amount to convert</div>';
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return;
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}
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if (from === to) {
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out.innerHTML = `
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<div style="font-size: 18px; font-weight: 600; color: var(--text);">
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${amount.toFixed(2)} ${from}
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</div>
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<div style="color: var(--muted); margin-top: 5px;">
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Same currency - no conversion needed
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</div>
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`;
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return;
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}
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let conversionRate;
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let rateSource;
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let rateDate;
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if (manualRate && manualRate > 0) {
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console.log('Using manual rate:', manualRate);
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// Use manual rate
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conversionRate = manualRate;
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// Determine if this is user-entered or default custom rate
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const staticRate = staticRates[to] / staticRates[from];
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const isUserEntered = Math.abs(manualRate - staticRate) > 0.0001; // Allow for floating point precision
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rateSource = isUserEntered ? 'Custom rate' : 'Static rates';
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rateDate = isUserEntered ? 'Manual input' : '2025-09-01';
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out.innerHTML = `
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<div style="font-size: 24px; font-weight: 700; color: var(--accent); margin-bottom: 10px;">
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${(amount * conversionRate).toFixed(2)} ${to}
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</div>
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<div style="color: var(--text); margin-bottom: 5px;">
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<strong>Conversion:</strong> ${amount} ${from} × ${conversionRate.toFixed(4)} = ${(amount * conversionRate).toFixed(2)} ${to}
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</div>
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<div style="color: var(--muted); font-size: 14px;">
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<strong>Rate:</strong> 1 ${from} = ${conversionRate.toFixed(4)} ${to}<br>
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<strong>Source:</strong> ${rateSource}<br>
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<strong>Date:</strong> ${rateDate}
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</div>
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`;
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} else if (rates) {
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console.log('Using market rates, manual rate was:', manualRate);
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// Use fetched or static rates (fallback when no manual rate)
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conversionRate = rates[to] / rates[from];
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rateSource = lastFetch > 0 ? 'Live rates' : 'Static rates';
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rateDate = lastFetch > 0 ? new Date(lastFetch).toLocaleString() : '2025-09-01';
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out.innerHTML = `
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<div style="font-size: 24px; font-weight: 700; color: var(--accent); margin-bottom: 10px;">
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${(amount * conversionRate).toFixed(2)} ${to}
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</div>
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<div style="color: var(--text); margin-bottom: 5px;">
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<strong>Conversion:</strong> ${amount} ${from} × ${conversionRate.toFixed(4)} = ${(amount * conversionRate).toFixed(2)} ${to}
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</div>
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<div style="color: var(--muted); font-size: 14px;">
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<strong>Rate:</strong> 1 ${from} = ${conversionRate.toFixed(4)} ${to}<br>
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<strong>Rate:</strong> 1 ${to} = ${(1/conversionRate).toFixed(4)} ${from}<br>
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<strong>Source:</strong> ${rateSource}<br>
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<strong>Rates accurate as of:</strong> ${rateDate}
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</div>
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`;
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} else {
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out.innerHTML = '<div class="muted">Unable to calculate conversion</div>';
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return;
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}
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persist(key, {amount, from, to, manualRate});
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}
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// Manual rate input handler
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const manualRateInput = manualRateDiv.querySelector('[name="manualRate"]');
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manualRateInput.value = s.manualRate || '';
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// Debug logging
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console.log('Setting up manual rate input handler');
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// Set up the event listener
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manualRateInput.addEventListener('input', (e) => {
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console.log('Manual rate input event fired:', e.target.value);
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// Clear any existing status messages
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status.textContent = '';
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status.style.display = 'none';
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// Update the stored manual rate
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s.manualRate = +e.target.value || null;
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console.log('Updated manual rate to:', s.manualRate);
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// Simple test - just update the display immediately
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if (s.manualRate && s.manualRate > 0) {
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const amount = +ui.querySelector('[name=amount]').value || 0;
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const from = ui.querySelector('[name=from]').value;
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const to = ui.querySelector('[name=to]').value;
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console.log('Immediate calculation test:', { amount, from, to, manualRate: s.manualRate });
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// Determine if this is user-entered or default custom rate
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const staticRate = staticRates[to] / staticRates[from];
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const isUserEntered = Math.abs(s.manualRate - staticRate) > 0.0001; // Allow for floating point precision
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const rateSource = isUserEntered ? 'Custom rate' : 'Static rates';
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// Show immediate result
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out.innerHTML = `
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<div style="font-size: 24px; font-weight: 700; color: var(--accent); margin-bottom: 10px;">
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${(amount * s.manualRate).toFixed(2)} ${to}
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</div>
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<div style="color: var(--text); margin-bottom: 5px;">
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<strong>Conversion:</strong> ${amount} ${from} × ${s.manualRate.toFixed(4)} = ${(amount * s.manualRate).toFixed(2)} ${to}
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</div>
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<div style="color: var(--muted); font-size: 14px;">
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<strong>Rate:</strong> 1 ${from} = ${s.manualRate.toFixed(4)} ${to}<br>
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<strong>Source:</strong> ${rateSource}
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</div>
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`;
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} else {
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// Fall back to normal calculation
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calc();
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}
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});
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// Also add change event as backup
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manualRateInput.addEventListener('change', (e) => {
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console.log('Manual rate change event fired:', e.target.value);
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s.manualRate = +e.target.value || null;
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calc();
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});
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// Currency change handlers
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const fromSelect = fromDiv.querySelector('[name=from]');
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const toSelect = toDiv.querySelector('[name=to]');
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fromSelect.addEventListener('change', () => {
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s.from = fromSelect.value;
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// Update manual rate description and custom rate
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const desc = manualRateDiv.querySelector('div');
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desc.innerHTML = desc.innerHTML.replace(/1 [A-Z]{3} = X [A-Z]{3}/, `1 ${s.from} = X ${s.to}`);
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updateCustomRateWithStatic();
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calc();
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});
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toSelect.addEventListener('change', () => {
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s.to = toSelect.value;
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// Update manual rate description and custom rate
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const desc = manualRateDiv.querySelector('div');
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desc.innerHTML = desc.innerHTML.replace(/1 [A-Z]{3} = X [A-Z]{3}/, `1 ${s.from} = X ${s.to}`);
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updateCustomRateWithStatic();
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calc();
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});
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// Amount input handler
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const amountInput = amountDiv.querySelector('[name="amount"]');
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amountInput.addEventListener('input', calc);
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// Fetch rates button click handler
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fetchBtn.addEventListener('click', async () => {
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await fetchRates();
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calc(); // Recalculate with new rates
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});
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// Initialize custom rate with current static rate
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updateCustomRateWithStatic();
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// Initial calculation
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calc();
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root.append(ui);
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}
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}
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