Compound Interest

Description
Use JavaScript to calculate compund interest. Warns about doubtful data. ...View A Script Demo

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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 3.2 Final//EN">

<HTML>

<HEAD>

<META NAME="Generator" CONTENT="TextPad 4.4">

<LINK href="general.css" rel="stylesheet" type="text/css">

<SCRIPT LANGUAGE="JavaScript">

<!-- Original:  Paul Hartmann (guycroft@clara.co.uk) -->

<!-- Web Site:  http://www.guycroft.clara.net -->

<!-- Begin

var princ;

var ratepc;

var years;

var rate;

var power;

function calcAmt(frm) {

princ = eval(frm.pr.value);

ratepc = eval(frm.rt.value);

years = eval(frm.yr.value);

rate = ratepc / 100;

power = Math.pow((1 + rate), years);

frm.amt.value = Math.round(princ * power * 100) / 100;

frm.inter.value = Math.round((frm.amt.value - princ) * 100) / 100;

}

function checkInput(frm) {

if (rate == 0 || rate > .3) {

window.alert ("Are you sure that the interest rate is " + ratepc +"%?");

frm.rt.focus();

}

if (years == 0 || years > 30) {

window.alert ("Are you sure that the term is " + years + " years?");

frm.yr.focus();

   }

}

//  End -->

</script>

</HEAD>

<BODY Background=../graphics/grayback.jpg>

<center><BR><BR><BR>

<form method=get name=frm>

Principal <input type=text name=pr size=10 maxlength=10 onChange=calcAmt(this.form)>

Rate <input type=text name=rt size=6 maxlength=6 onChange=calcAmt(this.form)>

Years <input type=text name=yr size=5 maxlength=5 onChange=calcAmt(this.form)>

<br>

<br>

<input type=button name=calc value="Calculate" size=10 onClick=checkInput(this.form); calcAmt(this.form);>

<input type=reset value="Clear">

<br>

<br>

Amount <input type=text name=amt size=10>

Interest <input type=text name=inter size=10>

</form>

</center>

</BODY>

</HTML>

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