var iWidth = 250;
var iHeight = 250;
var startWidget='';
document.write(startWidget + buildCalc(100000,8,30) + stopWidget);
function calculateMe()
{
var principle = document.getElementById('frmPrinciple').value;
var rate = document.getElementById('frmRate').value;
var term = document.getElementById('frmTerm').value;
var output = document.getElementById('calculatorOutput');
if (isNaN(principle) || isNaN(rate) || isNaN(term))
{
alert('Please enter only numbers for the principle, rate, and term');
return;
}
if(principle.length<=0 || rate.length<=0 || term.length <= 0)
{
alert('Please enter information for the principle, rate, and term.');
return;
}
if (principle <=0 || rate <= 0 || term <= 0)
{
alert('Please enter only positive numbers for the principle, rate, and term.');
return;
}
var PF = 12; //payment frequenecy;
var I = rate/100;
var i; //to be calculated
var n = PF * term; //payments
i = Math.pow((1 + I/PF),(12/PF)) - 1;
var afSub = Math.pow( (1/(1+i)) , n );
var AF = (1 - afSub ) / i;
var payment = principle/AF;
//assemble the final monthly payment
var roundedPayment = parseInt(payment);
var decimal = Math.abs(Math.round(payment*100) - roundedPayment*100);
var monthlyPayment;
if (decimal < 10)
{
monthlyPayment = "$" + roundedPayment + ".0" + decimal;
}
else if (decimal>=10)
{
monthlyPayment = "$" + roundedPayment + "." + decimal;
}
else
{
monthlyPayment = "$" + roundedPayment;
}
var outputString = 'Your monthly payment is ' + monthlyPayment + '.\
Click here to view a complete amortization schedule on myAmortizationChart.com
';
output.innerHTML = outputString;
}
function resetCalc(p,r,t)
{
var widget = document.getElementById('myCalculator');
widget.innerHTML = buildCalc(p,r,t);
}
function buildCalc(p,r,t)
{
var middleWidget='Amortization Calculator\
Provided by myAmortizationChart.com\
Determine the monthly payment of a loan.\
';
return middleWidget;
}