var interest= 0;
var principle= 0;
var numPeriods= 0;
var effIR= 0;
var amortTime= new Array(0, 0, 0);
var result= new Array(0, 0, 0);
var numPayments= new Array(0, 0, 0);
var numYears= new Array(0, 0, 0);
var monthPay= new Array(0, 0, 0);
var totalInt= new Array(0, 0, 0);
var amortPeriod= new Array(13);
for (s= 0; s<= 12; s++)
amortPeriod[s]= new Array();
amortPeriod[0]= [0.5, "6 Months"];
amortPeriod[1]= [1, "1 Year"];
amortPeriod[2]= [2, "2 Years"];
amortPeriod[3]= [3, "3 Years"];
amortPeriod[4]= [4, "4 Years"];
amortPeriod[5]= [5, "5 Years"];
amortPeriod[6]= [6, "6 Years"];
amortPeriod[7]= [7, "7 Years"];
amortPeriod[8]= [10, "10 Years"];
amortPeriod[9]= [15, "15 Years"];
amortPeriod[10]= [20, "20 Years"];
amortPeriod[11]= [25, "25 Years"];
amortPeriod[12]= [30, "30 Years"];
var paymentPeriod= new Array(4);
for (s= 0; s<= 3; s++)
paymentPeriod[s]= new Array();
paymentPeriod[0]= [12, "Monthly (12 Payments a year)"];
paymentPeriod[1]= [24, "Bi-Monthly (24 payments a year)"];
paymentPeriod[2]= [26, "Bi-Weekly (26 payments a year)"];
paymentPeriod[3]= [52, "Weekly (52 payments a year)"];
function Loan(curForm)
{
//var month;
// Grab the form vars
var basePrice= parseFloat(curForm.price.value);
var dpayment= parseFloat(curForm.dpayment.value);
if(isNaN(dpayment))
dpayment= 0;
var yearlyIR= parseFloat(curForm.interest.value);
//var numYears= parseFloat(curForm.time1.value);
// Now some prep calcs
var mortAmount= basePrice- dpayment;
numPeriods= parseInt(curForm.periods1.value);
effIR= yearlyIR/ numPeriods;
// Prep output window
win02= window.open("", "", "menubar=no,location=no,toolbar=no,resizeable=yes,scrollbars=yes,directories=no");
win02.window.resizeTo(600,600);
htmlHeader= ' \
Comparing Savings for Various Amortization Periods \
\
\
\
';
win02.document.write(htmlHeader);
// THIS IS STRICTLY FOR TEXT OUTPUT, SO WE CAN PLAY BACK THE USER'S INPUT PAYMENT PERIOD
for(a=0; a \
\
\
Results of Amortization Calculations
\
\
\
\
Amortization period (years)
\
Total number of Payments you will make
\
Each payment will be
\
Total interest you will pay
\
';
win02.document.write(htmlOut);
// Loop through each of the period choices
var t= 0;
for(j=0; j< curForm.elements.length; ++j)
{
// Only consider those input fields that were of type text. (i.e. ignore input buttons)
if (curForm.elements[j].type== "select-one")
{
timePattern= /time+/;
if (timePattern.test(curForm.elements[j].name)== true)
{
//checkNumeric(document.forms[curForm].elements[j], MAX);
//alert(curForm.elements[j].value);
//numPeriods[t]= parseInt(curForm.elements[j].value);
//numPayments[t]= numYears* numPeriods[t];
//effIR[t]= yearlyIR/ numPeriods[t];
numYears[t]= parseFloat(curForm.elements[j].value);
numPayments[t]= numYears[t]* numPeriods;
var negmonth= -1* numPayments[t];
var deno= 1- (Math.pow(effIR+ 1,negmonth));
var numo= effIR;
result[t]= numo/ deno;
monthPay[t]= mortAmount* result[t];
// Now, while still in here, loop through each of the numPayments loops
var remainAmount= mortAmount;
for(y= 1; y<= numPayments[t]; y++)
{
interest= remainAmount* effIR;
principal= monthPay[t]- interest;
remainAmount= remainAmount- principal;
interest= Currency(interest);
principal= Currency(principal);
totalInt[t]+= parseInt(interest);
} // end payment loop
// Assign new values back to HTML form
htmlOut= '
\
\
';
win02.document.write(htmlOut);
} // end loan()
function getAmortPeriod(row, ind)
{
return amortPeriod[row][ind];
}
function getPaymentPeriod(row, ind)
{
return paymentPeriod[row][ind];
}
function check(curForm)
{
var dPayment = curForm.dpayment.value;
var price = curForm.price.value;
// First two checks on on the string values represented by the price and downpayment
if(price.indexOf(",") >= 0)
{
alert("Please do not put commas in the Purchase Price.");
return false;
}
if(dPayment.indexOf(",") >= 0)
{
alert("Please do not put commas in the Down Payment number");
return false;
}
// Now pull the integer values- and check if they are set.
price= parseInt(price);
dPayment= parseInt(dPayment);
// Price cannot be empty
if( isNaN(price) )
{
alert("Please enter a purchase price for your home.");
return false;
}
// Downpayment can be empty, but set it to zero if it is.
if(isNaN(dPayment))
dpayment= 0;
// Downpayment cannot be greater than purchase price
if(price< dPayment)
{
alert("Your downpayment is greater than the purchase price.\nYou can buy the home with cash!");
return false;
}
// And must be >0
if(price<0 || dPayment<0)
{
alert("Please use numbers greater than 0.");
curForm.price.value= 0;
curForm.dpayment.value= 0;
return false;
}
return true;
}
