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","");
[code]...
monthly payment = c*r*(1+r)^n /(1+r)^n
View 22 Replies View RelatedThe 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 = ""; .....
I am having some difficulty in constructing a window.confirm() function that works with my code.So if the form data is valid, I need to use a window.confirm() dialog box to show the user's total cost based on the rental rate of equipment chosen and the reservation period. The user must accept the cost by pressing the confirm button, and if user cancels do not submit data.I have written this code but cannot figure out how to find the number of days from the 2 date fields and use that to calculate and display the total cost.
//confirm submit and display rental cost
var equip = document.forms[0].equipment.value
var pDate = document.forms[0].pickupDate.value[code].....
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 have a mortgage calc that is adding an extra decimal place to my interest rate. To see this in action go to: [URL]
Change the interest rate to 7.5
Click Calculate Payment
Click Create Amortization Chart
On the following screen you'll see a recap of your data and the interest rate will now say 7.55. Same thing happens if you enter 6.2. Next screen shows 6.22/. I've attached the html and js files in a zip.
I want to add onto my ebay auction a calculation which would show the unit price of a box of 5 electrical sockets.
So say it is currently on auction at £5.62 and I charge £1.99 Postage & packing thats a total of £7.61 with a unit price of £1.52. Then £1.52 is the figure I want to output and show on screen.
I'm just starting out in JS and would like to know how to solve this.
I have an HTML form with 3 checkboxes, like a would-be order form. For example, on checkbox 1, the product is a toy car that costs $5.00, second box is a cigar cutter for $50, etc. I to have a button that when clicked, enters the total price (no taxes or subtotals) into a textbox field below in the same page.
I believe that this has been answered somewhere but I cannot find it. I have 51 textboxes on page. In 50 I can enter value. 51st should tell me what is average of entered numbers.
As user types I want script to iterate trough form count and sum non-empty fields and than divides this two numbers.I need to sum values from fields that have value (not emty fields) and to divide this number by number of non empty fields. This should occur on every change in any of those 50 textboxes so to have live preview of average.
I'm really new to JS and I don't know even how to sum these numbers.
I have some data thats in a number, lets say 5455
.
Id like to get the TAX from an input, say like 2.5 percent. code...
I want to calculate X and Y of a div, but I get an infinite loop, can you tell me please what's the problem with my code? code...
View 4 Replies View RelatedI built 2 steps script - in the first page the visitor choose the date he want to schedual his appoitment and his location:
PHP Code:
<select name='zone'>
<option value='-4' selected> USA - EST</option>
<option value='-7'>USA - PST</option>
[code]....
In the second page he need to choose the time he want for his appointment (the time is in GMT+3 -> my local time). in this page the script also get the time zone and the date that he choose in the previous page (using POST - PHP). the date saved in variable. I used unix time (MKTIME function) I want that every time my visitor choose time (from drop-down box) a new cell/DIV will appear with his local time.for example - when he choose date: 10 May 2010, time zone: Austrlia - East Coast (+8 Hours) and time 22:00, New DIV will appear with the date "11 May 2010, 03:00AM" (there are 5 hours different).what is the JS what caculate and show the visitor local time?(I have, in PHP, only his time zone and the date that he coose in the first page)
I have tried many time to make the calculation to appear at the total text box.
here is my coding..
<html>
<head>
<title>
PRESENTATION EVALUATION FORM
[Code]....
I'm working on creating a custom calculator to determine the amount of money / credits users may earn from referrals. I've tested onChange, and it will work only when I have changed to a new field or clicked off that field. How do I make this calculate live?
So if the current value is 5 and I change it to 6, it will automatically recalculate the new value.
You can see what I'm working on here:
[URL]
Note: The one I'm testing is the 1st Level field. For now i'm just having it display the date.
Can someone explain to me how I should code to calculate this?
I want to let the user add 4 different numbers (this is done) and then I want to + these numbers with each other.
This is the code I got: var medel = tal1+tal2+tal3+tal4 ;
Let say the user enters 1+2+3+4. Then the result should be 10. But I get this number as result: 1234
What have I done wrong?
I am making what I call a PM (Preventive Maintenance) Kit list. My users will use this list to generate a printable sheet to tell me what they used out of there kit. The list includes pricing per part and I would like the list to calculate the costing as they enter each item. So a total per line and an overall total cost.
I have included a snap shot of the page and below is the code. I can do this sort of thing on a small scale with just adding two lines but I am not sure how to modify it to handle this scale. You can see the script towards the bottom of the page. That is my lame attempt to make the per line costing happen but NOTHING happens.
<?php
require "../config/bpts_config.php";
// Start the session
//session_start();
?>
<!DOCTYPE html PUBLIC "-//W3C//DTD HTML 3.2//EN">
<html>
[Code]...
This is my coding that I try but I still cannot get the function to calculate cgpa.
<script language="Javascript" type="text/javascript">
/*Gred*/
function DisplayGred (GredPair) {
var Gred = GredPair.split('|');
var jam_kredit = document.getElementById('jam_kredit').value; (user input pay amount student pay for course)
document.getElementById('pointer').value = Gred[1]; (display course fee when item is selected)
}
function CalculateCGPA () .....
This is the interface look alike, the code subject, subject name and credit hours are retrive from the database, so how to calculate it?
</p>
<form id="form1" name="form1" method="post" action="">
<table width="552" height="82" border="0" class="tborder">
<tr bgcolor="#006699" class="text2">
<td width="17" bgcolor="#000099"><div align="center" class="style3"><strong><font size="2">Bil</font></strong></div></td> .....
I want to have 1 option box with values 10 100 1000 10000 etc in it , then i want to be able to select eg 100 and underneath it will show 100x25 which would be 2,500 so i want 1 box that has values of ten , hundred , thousand etc and they multiply by 25 and show underneath .
View 3 Replies View RelatedI have 3 textbox controls on my web page that are numeric currency fields in which a user can enter a numeric value, either positive or negative into TB1 and TB2 (both of these fields go thru edit checks to make sure a numeric value is entered and then return a currency value ie; $2500.00). TB3 is calculated resulting in TB3 = TB1 (($6500)) - TB2 ($2500).
My problem is that if a user enters a negative value for TB1, it returns a "NaN" and the value in TB3 turns out to be the same value as in TB2. Essentialy the calulation ends up being 0 - 2500 = 2500 (see screenshot). I've attached 2 functions below.
Code:
function cal_Overage_Shortage() {
if (make2Number("TB_LowPoint") <= 0) {
document.getElementById("TB_OverageShortage").value = GetValueTextbox("TB_LowPoint") + GetValueTextbox("TB_RequestedLowPoint");
[Code]....
Using this formula for parts per million, can somebody please show a SIMPLE example of how to calculate all formulas for ppm?i tried everything..like in kilograms, etc...anyway, the link:[URL]
View 9 Replies View RelatedFor my website i would like to display the age of my son in years,
months, days and hours.
For now i manage to get a result for totals. Like the total number of
days.
This is the beginning:
starttime = Date.parse("Aug 10,2003, 07:07")
sdt = new Date(starttime)
starttime= Math.ceil((starttime) / 1000 / 60 / 60 / 24 )
ndt = new Date()
y = sdt.getYear()
m = sdt.getMonth() + 1
d = sdt.getDate()
h = starttime
automatically calculate a total. The script pulls a price, which is given from a database to a hidden form field. Then once the quantity is changed the bottom form field automatically updates the price. Here's my script if someone could possibly point out why this might not be working (or is my logic flawed.)
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>Shopping Cart</title>
<script type="text/javascript">
/* <![CDATA[ */
function calcTotal(){
[Code]...
i have a problem with the arrays.i have entered all the relevant arrays to calculate a list of cheap quotations but when clicking on the submit button it doesnt do nothing.when clicking on the submit button i want it to bring up the list of quotations based on the data entered in the form..
View 7 Replies View RelatedPlease can u help? how would i get the total work hours between two times (8:30 to 5:30) from a web form.I tried just minusing one from the orther but it came back with "Nan"
View 2 Replies View Relatedwriting a function that will dynamically calculate filed values.I have a PHP-generated form which may have a varying number of fields. I need to:
1. calculate the line total for each row -- unitprice * units = linetotal
2. calculate total of all linetotals.
I have named my fields as follows:
unitprice[1], unitprice[2]... , units[1], units[2], ...
I have the following calculate function:
function calculateOld() {
// get both values
unitprice = document.forms["invoice"].unitprice.value;[code].....
This does calculate what I need but only if I have up to two rows. I need to make the function dynamically count how many rows there are, and calculate the linetotal for each row. And here's where my limited JS knowledge brings me to a halt.I have been thinking about what this new and dynamic function should look like, but that's the best I could produce...
function calculate() {
var unitprice[i]= document.forms["invoice"].unitprice[i].value;
var units[i]= document.forms["invoice"].units[i].value;[code]....
how things are done, don't just give me the code.
I can get the number of contributers to add up but not the total amount of dollars they contributed. I am not sure if my function is wrong or if I am just confused with what variable to output for the dollar amount total.
[Code]...