https://finveda.vercel.app/tools/npvCalculator.js

1let cashFlowCount = 0;
2
3function addCashFlow() {
4    cashFlowCount++;
5    const cashFlowsDiv = document.getElementById('cashFlows');
6    const newCashFlow = document.createElement('div');
7    newCashFlow.className = 'cash-flow-item';
8    newCashFlow.innerHTML = `
9        <label for="cashFlow${cashFlowCount}">Year ${cashFlowCount} : <br> ₹</label>
10        <input class="form-control" id="cashFlow${cashFlowCount}" type="number"/>
11        <button type="button" onclick="removeCashFlow(this); cashFlowCount--;">x</button>
12    `;
13    cashFlowsDiv.appendChild(newCashFlow);
14}
15
16function removeCashFlow(button) {
17    const cashFlowItem = button.parentElement;
18    cashFlowItem.remove();
19}
20
21function calculateNPV() {
22    const initialInvestment = parseFloat(document.getElementById('initialInvestment').value);
23    const discountRate = parseFloat(document.getElementById('discountRate').value) / 100;
24    const cashFlowItems = document.querySelectorAll('.cash-flow-item input');
25
26    if (isNaN(initialInvestment) || isNaN(discountRate)) {
27        alert('Please enter valid inputs.');
28        return;
29    }
30
31    let npv = -initialInvestment;
32    cashFlowItems.forEach((input, index) => {
33        const cashFlow = parseFloat(input.value);
34        if (isNaN(cashFlow)) {
35            alert('Please enter valid cash flow values.');
36            return;
37        }
38        npv += cashFlow / Math.pow(1 + discountRate, index + 1);
39    });
40
41    document.getElementById('npvResult').textContent = npv.toFixed(2);
42}