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Smurfette
08-09-2003, 12:59 PM
I am quite new to this and am using Macromedia dreamweaver layers to paste this script into via Javascript.

I put the 1. Copy the coding into the HEAD of your HTML document into the top part of the layer

2. Add the last code into the BODY of your HTML document --> into the bottom half of the layer.

I did it like this but bugs come up, can someone look at this and see if i am doing this Amortisation Calculator right?

Thanks

<HEAD>

<SCRIPT LANGUAGE="JavaScript">
<!-- Original: Brian Cordeau (stdbsc13@shsu.edu) -->
<!-- Web Site: http://www.shsu.edu/~stdbsc13 -->

<!-- This script and many more are available free online at -->
<!-- The JavaScript Source!! http://javascript.internet.com -->

<!-- Begin
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");
}
}
// End -->
</script>

</HEAD>
<BODY>

<form method="get" name=calcform action="amortization.html">
<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" align="left">
<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>

<p><center>
<font face="arial, helvetica" size"-2">Free JavaScripts provided<br>
by <a href="http://javascriptsource.com">The JavaScript Source</a></font>
</center><p>

<!-- Script Size: 7.76 KB
ShawnJ434
08-09-2003, 04:28 PM
Smurfette,
<form method="get" name=calcform action="amortization.html"> in this line of code in the script amortization.html needs to be replace with the name of the page you are working on. OR rename your page amortization.html. If this doesn't help try not using layers, they might be whats giving you trouble. Try doing it in a plain page first.
ShawnJ434
ShawnJ434
08-09-2003, 05:04 PM
I was reading over your question again and I'm wondering why you are using layers at all. I'm not being rude when I ask how much do you understand about html. If you are not familar with html and the <head> and <body> tags we need to start here.
ShawnJ434