CODEWITHSUNDEEP
javascriptcalculator
Harry Bougard
Harry Bougard

Reputation: 25

Consulting about loan calculator function

I'm trying to do a loan calculator where you can input the amount you want to borrow, the amount of months that you plan to pay everything and select a type of credit (car, studies, home, etc) that determines the interest rate of each.

In JavaScript, I called values from Loan Amount - Months to Pay - dropdown list with Type of Credits that provides different interest values. I try to work around this formula and write it in text like this:

p*(r*(1+r)^n/1-(1+r)^n);

Am I right with the formula I'm using to get Fixed monthly payment -- am I right writing the formula in text/code way? I'm also doing the output this way:

document.getElementById("id-name").innerHTML = p*(r*(1+r)^n/1-(1+r)^n);

Is this the right way to do it or should i do the formula in another var z and call innerHTML = z ?? Finally, this would be the full JS function with the input variables:

function CALCULADORA() {
 var x = document.getElementById("list").value;
 var i = x/100;
 var c = document.getElementById("cuotas").value;
 var y =  document.getElementById("valor").value;
 document.getElementById("CALCULATOR").innerHTML =  y*(x*(1+x)^c/1-(1+x)^c);
}

/*
x is Interest rate in percentage given by a dropdown list
i is Percentage / 100
c is Months to pay loan
y is Loan value 
*/

The issue is that not getting the full formula, my result is only the Loan value divided by months to be paid -- that is what I got displayed. Thanks to any help you can give me! This is one of my first codes.

Upvotes: 2

Views: 218

Answers (1)

mcgraphix
mcgraphix

Reputation: 2733

Make sure you are converting those values to numbers before trying to math on them. Specifically when adding. Something like 1+x will not give you what you expect when x is a string like 0.2.

Assuming those values can be decimals, you will need to do something like:

 var x = parseFloat(document.getElementById("list").value);
 var i = x/100;
 var c =  parseFloat(document.getElementById("cuotas").value);
 var y =  parseFloat(document.getElementById("valor").value);

Upvotes: 0

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