albano
Posts: 132
Joined: 11/30/2003
Status: offline
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ASP Mortgage APR Calculator! - 10/18/2004 15:33:53
Hi everybody! After searching everywhere I thought I can use some help. I need to know if somebody can write the ASP version of this Javascript Calculator or if someone can write the formula in ASP (APR Mortgage Calculator. Here is the code: <html>
<head>
<title>APR Calculator</title>
</head>
<body bgcolor="#FFFFFF">
<SCRIPT>
function fixFloatFormat(input) {
if ((input.value == 0) && (input.length == null)) {
input.value = "0.00";
}
var temp = eval(input.value) + 0.005
var cents = "" + (100 + Math.floor((temp - Math.floor(temp)) * 100));
var dollars = "" + Math.floor(temp);
input.value = dollars + "." + cents.substring(1,3);
return true;
}
function calcPeriod(input) {
var output = 12;
if (input == 0) {
output = 12;
}
return output;
}
function approxRate(loan,period,monthly) {
var xOld=0;
var n = period;
var z = monthly/loan;
var x=1.1;
if ((eval(loan) == 0) || (eval(period) == 0) || (eval(monthly) == 0)) {
return "0.00";
}
while (Math.floor((xOld-1)*10000) != Math.floor((x-1)*10000)) {
xOld=x;
x=xOld - ((Math.pow(xOld,n+1) - (Math.pow(xOld,n) * (z + 1)) +z) / (((n + 1) * Math.pow(xOld,n)) - (n * (z + 1) * Math.pow(xOld,n - 1))));
}
return (1200 * (x - 1));
}
function calcMonthlyPay(interest,loan,year,period) {
var numerator, denominator, periods, interestRate = 0;
var i = interest;
if (i > 1.0) {
i = i * 0.01;
}
interestRate = i / 12;
periods = year * calcPeriod(period);
numerator = loan * interestRate * Math.pow(1 + interestRate, periods);
denominator = Math.pow(1 + interestRate, periods) - 1;
monthlypay = numerator / denominator;
return monthlypay;
} //end calcMonthlyPay
function calcApr(form) {
fixFloatFormat(form.loan);
if (form.interest.value < 1.0) {
form.interest.value = 100 * form.interest.value;
}
fixFloatFormat(form.interest);
var i = form.points.value;
i = i * 0.01;
fixFloatFormat(form.points);
fixFloatFormat(form.dpoints);
fixFloatFormat(form.ins);
var loan = (((form.loan.value - (form.loan.value*(form.points.value*.01)))-(form.loan.value*(form.dpoints.value*.01)) - form.costs.value) - form.ins.value);
var period = form.years.value * calcPeriod(form.period.value);
form.apr.value = approxRate(loan,period,calcMonthlyPay(form.interest.value,form.loan.value,form.years.value,form.period.value));
fixFloatFormat(form.apr);
return true;
}
</SCRIPT>
<table border="0" cellpadding="0" cellspacing="0" width="600">
<tr>
<td width="573" valign="top" align="left"><font face="Arial" size="2" color="#000000">
<FORM action="" method="POST">
<INPUT TYPE="HIDDEN" NAME="period" VALUE="12" onBlur="calcApr(this.form)">
<font color="#000080" face="Arial" size="2">
<P><CENTER><TABLE BORDER=0 CELLSPACING=1 WIDTH=400>
<TR>
<TD WIDTH=150>
<P ALIGN=RIGHT><B>Loan Balance:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="loan" VALUE="100000.00" onBlur="calcApr(this.form)" SIZE=10>
</TD></TR>
<TR>
<TD WIDTH=150>
<P ALIGN=RIGHT><B>Interest Rate:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="interest" VALUE="8.00" onBlur="calcApr(this.form)" SIZE=10>
</TD></TR>
<TR>
<TD WIDTH=150>
<P ALIGN=RIGHT><B>Period:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="years" VALUE="30" onBlur="calcApr(this.form)" SIZE=10>
</TD></TR>
<TR>
<TD WIDTH=150>
<P ALIGN=RIGHT><B>Origination Points:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="points" VALUE="1.00" onBlur="calcApr(this.form)" SIZE=10>
</TD></TR>
<tr>
<TD WIDTH=150>
<P ALIGN=RIGHT><B> Discount Points:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="dpoints" VALUE="0.00" onBlur="calcApr(this.form)" SIZE=10>
</TD>
</tr>
<tr>
<TD WIDTH=150>
<P ALIGN=RIGHT><b>Closing Costs:</b>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="costs" VALUE="1200" onBlur="calcApr(this.form)" SIZE=10>
</TD>
</tr>
<TR>
<TD WIDTH=150>
<P ALIGN=RIGHT><B>Mortgage Ins:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="ins" VALUE="0.00" onBlur="calcApr(this.form)" SIZE=10>
</TD></TR>
<TR>
<TD WIDTH=150>
<P ALIGN=RIGHT><B>APR:</B>
</TD><TD WIDTH=10>
<P>
</TD><TD WIDTH=100>
<P><INPUT TYPE="text" NAME="apr" VALUE="0.00" onBlur="calcApr(this.form)" SIZE=10>
</TD></TR>
</TABLE></CENTER>
</font>
</FORM>
</td>
</tr>
</table> </body></html> and here is the link to the calculator: http://truelending.com/apr_calculator.htm
_____________________________
Mortgage Site Link Exhange | http://www.truelending.com
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