Bank Website - Calculating Loan Repayment With Interest
Jun 10, 2010
I am having a few problems with my JS, and now that the module has finished, I find myself struggling still. I am going to post my JS and the HTML page its related to. The site is a mock up for an assignment - basically, its a pretend bank website where a person applies for a loan, and all my JS does is work out if the applicant does the following correctly:
Enters repayment years 1 to 25
Enters a loan amount of 1000 to 250000
Checks a box for loan protection
Calculate button
Reset Button
Then tells the user what it is going to cost them from interest to total amount to be paid.
Javascript:
function init(){
var baserate=4.25;
var amount=parseInt(document.getElementById("loan").value);// end bracket missing - done
var repaymentyears=parseInt(document.getElementById("repaymentyrs").value);// end bracket missing - done
var rate;
var interest;
var loanprotect=5;
var total;
var monthlyrepayment=repaymentyears*12; .....
i want the code below to display the total loan repayment amount instead of the monthly payment payment = principle * monthly interest/(1 - (1/(1+MonthlyInterest)*Months)) , eg if if l0an is 20$ payment is in 4 months, intrest rate is 15% display = amount to be repaid.
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I'm a JavaScript newbie and need help with code.Given principle, yearly interest rate and time in years, I need to calculate interest earned and the ending amount in the account at the end of time.
Formulas:
I=P*R*T S=P+T
This is what I have which didn't work:
<script type="text/javascript"> var P,R,T,I,S; P=prompt("enter your Principle","");
The exercise problem is to "MODIFY the code in the "calculate_click" event so interest is added to future value just once each year for the number of years that they were entered by the user". The calculation as you see it below assumes an amount is invested MONTHLY (not just once), and the interest is calculated accordingly. This is what I think the problem is trying to calculate: using a $100 one time investment at 10% interest (compounded once annually) for one year = $110 as the future value. For two years, the future value should equal $121 (110 + (110*.10)). Okay, if my math is wrong, let me know. This is what I'm trying to get it to match to.
I have been able to modify the calculate_click function to compound the interest annually (it does it monthly now). Cool. I cannot get it to stop adding $100 annually. See my math above? I think that's the answer. My manipulation of the code yields $110 for the first year, $231 for the second year, etc. The $231 is incorrect cuz it adds an extra $100. See, this is a simple interest calculator I can't figure out! The original code is below that calculates the investment as a monthly investment as opposed to one-time. To avoid confusion, I did not include any of my modifications. But yeah. I know that the major culprit is how the "for" loop is being executed. I've highlighted where I think the code needs to be changed, but I haven't changed it here. Note the first function is a shortcut to execute getElementbyID.
The Code: var $ = function (id) { return document.getElementById(id); } var calculate_click = function () { var investment = parseFloat( $("investment").value ); var annualRate = parseFloat( $("rate").value ); var years = parseInt( $("years").value ); $("futureValue").value = ""; .....
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Unfortunately my code doesn't seem to return either 'true' or 'false'!
The code is:
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but this does not seem to work. It says the ip is 127.0.0.1. Strangely, this piece of code used to work but all of a sudden it doesn't for some unknown reason. Can anyone tell me what's wrong with the above code?
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<!DOCTYPE html PUBLIC "-//W3C//DTD XHTML 1.0 Strict//EN" "http://www.w3.org/TR/xhtml1/DTD/xhtml1-strict.dtd"> <html xmlns="http://www.w3.org/1999/xhtml">[code].....
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