<script
language="javascript"
type="text/javascript">
function
Loan()
{
var
housePrice;
var
IR;
var
dpayment;
var
years;
var
monthPay;
var
month;
switch(document.calcform.startm.value)
{
case
"january":
document.calcform.startm.value="0";
parseInt(document.calcform.startm.value)
break;
case
"february":
document.calcform.startm.value="1";
parseInt(document.calcform.startm.value)
break;
case
"march":
document.calcform.startm.value="2";
parseInt(document.calcform.startm.value);
break;
case
"april":
document.calcform.startm.value="3";
parseInt(document.calcform.startm.value);
break;
case
"may":
document.calcform.startm.value="4";
parseInt(document.calcform.startm.value);
break;
case
"june":
document.calcform.startm.value="5";
parseInt(document.calcform.startm.value);
break;
case
"july":
document.calcform.startm.value="6";
parseInt(document.calcform.startm.value);
break;
case
"august":
document.calcform.startm.value="7";
parseInt(document.calcform.startm.value);
break;
case
"september":
document.calcform.startm.value="8";
parseInt(document.calcform.startm.value);
break;
case
"october":
document.calcform.startm.value="9";
parseInt(document.calcform.startm.value);
break;
case
"november":
document.calcform.startm.value="10";
parseInt(document.calcform.startm.value);
break;
case
"december":
document.calcform.startm.value="11";
parseInt(document.calcform.startm.value);
break;
default:
document.calcform.startm.value="0";
parseInt(document.calcform.startm.value);
break;
}
housePrice
=
parseFloat(document.calcform.price.value);
dpayment
=
parseFloat(document.calcform.dpayment.value);
IR
=
parseFloat(document.calcform.interest.value);
years
=
parseFloat(document.calcform.time.value);
housePrice
=
housePrice -
dpayment;
month
=
years *
12;
interestRate
=
IR /
12;
negmonth
=-
1
*
month;
var
bottom
=
1
-
(Math.pow(interestRate+1,negmonth));
var
top
=
interestRate;
var
mid =
top
/
bottom;
var
dec;
document.calcform.monthPay.value
=
(housePrice
*
mid);
monthPay
=
document.calcform.monthPay.value;
document.calcform.monthPay.value
=
eval(monthPay);
housePrice
=
housePrice -
document.calcform.monthPay.value;
document.calcform.month.value
=
month;
}
function
convert()
{
var
startmonth =
new
String();
startmonth
=
document.calcform.startm.value;
document.calcform.startm.value
=
startmonth.toLowerCase();
}
function
changenum()
{
document.calcform.startyear.value=parseInt(document.calcform.startyear.value);
}
var
d =
new
Date;
function
getFieldValue (strFieldName)
{
var
strFieldValue;
var
objRegExp =
new
RegExp(strFieldName
+
"=([^&]+)","gi");
if
(objRegExp.test(location.search))
strFieldValue
=
unescape(RegExp.$1);
else
strFieldValue="";
return
strFieldValue;
}
function
Currency(money1)
{
var
money =
new
String(money1);
var
decimal =
money.indexOf(".",[0]);
var
money =
money.substring(0,decimal+3);
var
money1 =
parseFloat(money);
return
money;
}
var
startmonth;
startmonth
=
getFieldValue("startm");
var
monthofpayment =
new
String;
month
=
getFieldValue("month");
monthPay
=
getFieldValue("monthPay");
Houseprice
=
getFieldValue("price");
Ir
=
getFieldValue("interest");
Ir
=
Ir/12;
year
=
getFieldValue("startyear")
function
check()
{
var
dPayment =
document.calcform.dpayment.value;
var
price =
document.calcform.price.value;
if(price.indexOf(",")
>=
0)
{
alert("Please
do not put commas in the Price number")
}
}
function
check1()
{
var
dPayment =
document.calcform.dpayment.value;
if(dPayment.indexOf(",")
>=
0)
{
alert("Please
do not put commas in the Down Payment number");
}
}
</script>
<center>
<form
method="get"
name=calcform
action="amortization.htm">
<table
border=0>
<tr>
<td
valign="top">
Anticipated Amount of House
<br>
</td>
<td
valign="top">
$
<input
name=price
onblur="check()"
size=10>
</td>
</tr>
<tr>
<td>
Amount of Down Payment
</td>
<td>
$
<input
name=dpayment
onblur="check1()"
size=10>
<br>
</td>
</tr>
<tr>
<td>
Anticipated Interest Rate(.00 format)
<br>
</td>
<td>
<input
name=interest
size=10>
<br>
</td>
<tr>
<td>
Anticipated length of loan, in years.
<br>
</td>
<td>
<input
name="time"
size=10>
<br>
</tr>
<tr>
<td>
Start Date of Loan (month and year)
</td>
<td>
<input
name=startm
onblur="convert()"
size=10>
<input
name=startyear
onblur="changenum()"
size=10>
</td>
</td>
</tr>
<input
name=month
type=hidden>
<input
name=monthPay
type=hidden>
<tr>
<td>
<input
type=submit
value="Calculate
Mortgage"
onmouseover="check()"
onclick="Loan()">
</td>
</tr>
</table>
</form>
<table
border=0>
<tr>
<td>
House Price
</td>
<td>
$
<script
language="javascript">
document.write(getFieldValue("price"));
</script>
</td>
</tr>
<tr>
<td>
Down Payment
</td>
<td>
$
<script
language="javascript">
document.write((getFieldValue("dpayment")));
</script>
</td>
</tr>
<tr>
<td>
Monthly Payment
</td>
<td>
$
<script
language="javascript">
var
payment =
getFieldValue("monthPay");
payment=Currency(payment);
document.write(payment);
</script>
</td>
</tr>
<tr>
<td>
# of years
</td>
<td>
<script
language="javascript">
document.write(month/12);
</script>
</td>
</tr>
</table>
<table
border="1"
>
<tr>
<th
width="125">
Month/Year
</th>
<th
width="125">
Interest
</th>
<th
width="125">
Principal
</th>
</tr>
<script
language="JavaScript">
var
halfmonth;
halfmonth
=
month /
2;
for(y
=
0;
y
<=
month;
y++)
{
var
interest =
Houseprice *
Ir;
var
principal =
monthPay -
interest;
Houseprice
=
Houseprice -
principal;
interest
=
Currency(interest);
principal
=
Currency(principal);
if(startmonth
>
11)
{
startmonth
=
0;
year++;
}
switch(startmonth.toString())
{
case
"0":monthofpayment="January";
break;
case
"1":monthofpayment="February";
break;
case
"2":monthofpayment="March";
break;
case
"3":monthofpayment="April";
break;
case
"4":monthofpayment="May";
break;
case
"5":monthofpayment="June";
break;
case
"6":monthofpayment="July";
break;
case
"7":monthofpayment="August";
break;
case
"8":monthofpayment="September";
break;
case
"9":monthofpayment="October";
break;
case
"10":monthofpayment="November";
break;
case
"11":monthofpayment="December";
}
document.write("<tr><td
width='125'>")
document.write(monthofpayment+"
"+year+"</td>"+"<td
width='125'>"+"$"+interest+"</td><td
width='125'>"+"$"+principal);
document.write("</td></tr>");
startmonth++;
}
</script>
</table>
</center>
