Bank Islam Housing Loan Calculator

let loanSteps = “”; const currencySymbol = “RM”, fixedCurrency = “MYR”; function calculateLoan(){ loanSteps=””; const amount = parseFloat(document.getElementById(“loanAmount”).value); const rate = parseFloat(document.getElementById(“interestRate”).value) / 100 / 12; const term = parseFloat(document.getElementById(“loanTerm”).value) * 12; if(isNaN(amount) || isNaN(rate) || isNaN(term) || amount <= 0 || rate <= 0 || term <= 0){ alert("Please enter valid positive values for all fields."); return; } const monthlyPayment = (amount * rate) / (1 – Math.pow(1 + rate, -term)); document.getElementById("monthlyPayment").value = formatCurrency(monthlyPayment); loanSteps += `Inputs:
Loan Amount: ${formatCurrency(amount)}
Interest Rate: ${(rate * 100).toFixed(2)}%
Loan Term: ${term / 12} years

`; loanSteps += `Formulas:
Monthly Payment = Loan Amount × Monthly Interest Rate / (1 – (1 + Monthly Interest Rate)^{-Loan Term})

`; loanSteps += `Result:
Estimated Monthly Payment: ${formatCurrency(monthlyPayment)}
`; loanSteps += `Tip: Ensure your monthly payments fit your budget and financial goals.`; if(document.getElementById(“calculationStepsLoan”).style.display===”block”){ document.getElementById(“calculationStepsLoan”).innerHTML = loanSteps; } } function resetLoan(){ document.querySelectorAll(“#calculator input”).forEach(el => el.value = “”); loanSteps = “”; document.getElementById(“calculationStepsLoan”).innerHTML = “

Not calculated yet.

“; } function toggleLoanSteps(){ const s = document.getElementById(“calculationStepsLoan”); const a = document.getElementById(“toggleArrowLoan”); if(s.style.display === “none” || s.style.display === “”){ s.style.display = “block”; a.style.transform = “rotate(180deg)”; s.innerHTML = loanSteps || “

Not calculated yet.

“; } else { s.style.display = “none”; a.style.transform = “rotate(0deg)”; } } function formatCurrency(n) { return currencySymbol + n.toFixed(2) + ” ” + fixedCurrency; }