/*global window: true, alert: true */ var CBCMortgageCalculator = {}; var i; var interestPayment; CBCMortgageCalculator.roundToCents = function (n) { var Cents = n * 100; Cents = Math.round(Cents); var strCents = "" + Cents; var len = strCents.length; return strCents.substring(0, len - 2) + "." + strCents.substring(len - 2, len); }; CBCMortgageCalculator.Monthly = function (principal, years, apr) { var rate = apr / 12; var payments = years * 12; return CBCMortgageCalculator.roundToCents(principal * rate / (1 - (1 / Math.pow(1 + rate, payments)))); }; CBCMortgageCalculator.MonthlyAmortization = function (principal, years, apr) { var payments = years * 12; var monthlyInterest = apr / 12; var monthlyPayment = CBCMortgageCalculator.Monthly(principal, years, apr); var newWin = window.open("", "", "width=300,height=500,scrollbars=1,resizable=1"); newWin.document.open(); newWin.document.write(''); newWin.document.write("

"); newWin.document.write("Amortization Table"); newWin.document.write("

"); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); for (i = 1; i <= payments; i++) { if (i % 2 === 0) { newWin.document.write(""); } else { newWin.document.write(""); } newWin.document.write(""); interestPayment = principal * monthlyInterest; newWin.document.write(""); var principalPayment = monthlyPayment - interestPayment; principal -= CBCMortgageCalculator.roundToCents(principalPayment); if (i == payments) { principalPayment = principalPayment + principal; principal = 0; } newWin.document.write(""); newWin.document.write(""); newWin.document.write(""); } newWin.document.write("
"); newWin.document.write("$" + CBCMortgageCalculator.roundToCents(principal)); newWin.document.write(" at " + (apr * 100) + "%"); newWin.document.write(" over " + years + " years.
"); newWin.document.write("Monthly payment: $" + CBCMortgageCalculator.Monthly(principal, years, apr)); newWin.document.write("
Payment
MonthInterestPrincipalBalance
" + i + "$" + CBCMortgageCalculator.roundToCents(interestPayment) + "$" + CBCMortgageCalculator.roundToCents(principalPayment) + "$" + CBCMortgageCalculator.roundToCents(principal) + "
"); newWin.document.write("

"); newWin.document.close(); }; CBCMortgageCalculator.compute = function (form) { if ((form.CBCMortgageCalculator_principal.value.length !== 0) && (form.CBCMortgageCalculator_apr.value.length !== 0) && (form.CBCMortgageCalculator_years.value.length !== 0)) { var principal = form.CBCMortgageCalculator_principal.value; var apr = form.CBCMortgageCalculator_apr.value / 100.0; var years = form.CBCMortgageCalculator_years.value; if (years === 0.0) { alert( "You have no monthly payment, since the number of years is zero."); } else { CBCMortgageCalculator.MonthlyAmortization(principal, years, apr); } } else { alert("You must fill in all the fields."); } }; CBCMortgageCalculator.Morgcal = function (formName) { //form = document.myform //form = document.forms[formName]; var form = formName; var principal = form.CBCMortgageCalculator_principal.value; var DownPayment = "0"; var Annualapr = form.CBCMortgageCalculator_apr.value / 100; var years = form.CBCMortgageCalculator_years.value; var MonthRate = Annualapr / 12; var NumPayments = years * 12; var Prin = principal - DownPayment; var MonthPayment = Math.floor((Prin * MonthRate) / (1 - Math.pow((1 + MonthRate), (-1 * NumPayments))) * 100) / 100; form.CBCMortgageCalculator_payments.value = NumPayments; form.CBCMortgageCalculator_monthlyPayment.value = MonthPayment.toFixed(2); };