var inputStr = "";
var invalidNumber = 0;
var errorNumber = "";
var checkZero = 0;
var numtemp = "";
var prnttemp = "";
var P = 0;
var p = 0;
var I = 0;
var II = 0;
var N = 0;
var n = 0;
var blank = " ";
var pfinal = "";
function loanCalc(form) {
// get form input and determine if valid
var Ptemp = document.calc.amtLoan.value;
var itemp = document.calc.intRate.value;
var ntemp = document.calc.years.value;
//var ntemp = divtemp / 12;
inputStr = Ptemp;
errorNumber = "Amount of Loan";
validNumber();
Ptemp = inputStr;
inputStr = itemp;
errorNumber = "Annual Interest Rate";
validNumber();
itemp = inputStr;
inputStr = ntemp;
errorNumber = "Number of Years";
validNumber();
ntemp = inputStr;
// invalid input, clear monthly payment
if (invalidNumber == 1) {
document.calc.payment.value = "";
}
// valid input, calculate payment********************************************
else {
P = parseFloatX(Ptemp);
II = parseFloatX(itemp);
I = II / 100 / 12;
N = parseFloatX(ntemp);
n = N //* 12;
//************************n = N * 12;****************************************
if (n == 0) {
standardOutput(P);
document.calc.payment.value = numtemp;
}
else {
if (I == 0) {
p = P/n;
standardOutput(p);
document.calc.payment.value = numtemp;
}
else {
p = -((-P * I * Math.pow((1 + I),n)) / (Math.pow((1 + I),n) - 1));
standardOutput(p);
pfinal = numtemp;
document.calc.payment.value = pfinal;
//if (document.calc.amortTable.checked) {
//makeTable();
//}
}
}
}
}
//*******************************************************
// construct amorization table from data
function makeTable() {
standardOutput(P);
var PP = numtemp;
inputStr = document.calc.year1.value;
errorNumber = "First Payment";
validNumber();
var year = parseFloatX(inputStr);
var month = document.calc.month1.selectedIndex;
var firstMonth = month;
var curMonth = "";
var prntMonth = "";
var balance = P;
var prntBal = ""
var prinPaid = 0;
var prntPrin = ""
var intPaid = 0;
var prntInt = "";
var accumInt = 0;
// create new window for amortization data
var dataWindow = window.open("","dataWindow","menubar,scrollbars,resizable,width=625,height=350");
if (dataWindow != null) {
// assemble content for data window
var data = "";
data += 'Amortization Schedule';
data += 'Loan Amortization ';
data += 'Schedule
' + PP + ' at ' + II + '% ';
data += 'for ' + N + ' years
Monthly Payment: ' + pfinal + '';
data += 'Please Wait ';
data += '- slower CPU\'s may take a minute to build the table.
'
dataWindow.document.write(data);
data = "";
data += '
| ';
data += 'Month | ';
data += 'Principal Paid | ';
data += 'Interest Paid';
data += ' | ';
data += 'Balance Remaining |
| ';
data += '' + year + '';
data += ' | | | |
';
for (i = 0; i < n; i++) {
curMonth = document.calc.month1.options[month].text;
prntMonth = curMonth + blank;
prntMonth = prntMonth.substring(0,12);
intPaid = balance * I;
prntValue(intPaid,22);
prntInt = prnttemp;
accumInt += intPaid;
prinPaid = p - intPaid;
prntValue(prinPaid,22);
prntPrin = prnttemp;
balance -= prinPaid;
prntValue(balance,23);
prntBal = prnttemp;
data += '| ';
data += '' + prntMonth + ' | ';
data += '' + prntPrin;
data += ' | | ';
data += '';
data += '' + prntBal + ' |
';
if (month != 11) {
month++;
}
else {
month = 0;
year++;
if ((firstMonth != 0) || (i != n-1)) {
data += '![]() | ';
data += 'Loan + Interest:
' + Total;
data += ' |