Handle form submission to calculate conversion document.getElementById('currencyForm').addEventListener('submit', function(e) { e.preventDefault(); const fromCurrency = document.getElementById('fromCurrency').value; const toCurrency = document.getElementById('toCurrency').value; const amount = parseFloat(document.getElementById('amount').value); if (isNaN(amount) || amount <= 0) { alert("Please enter a valid amount."); return; } // Example exchange rates - replace with real API data const exchangeRates = { "USD_SAR": 3.75, "USD_EUR": 0.93, "USD_INR": 83.5, "SAR_USD": 0.267, "EUR_USD": 1.075, "INR_USD": 0.012 }; let conversionRate = 1; if (fromCurrency === "USD" && toCurrency === "SAR") { conversionRate = exchangeRates["USD_SAR"]; } else if (fromCurrency === "USD" && toCurrency === "EUR") { conversionRate = exchangeRates["USD_EUR"]; } else if (fromCurrency === "USD" && toCurrency === "INR") { conversionRate = exchangeRates["USD_INR"]; } // Calculate the converted amount const convertedAmount = amount * conversionRate; // Display the result document.getElementById('convertedAmount').textContent = `${convertedAmount.toFixed(2)} ${toCurrency}`; });