# Calculate Field Values Using Javascript

Feb 26, 2006

Can someone explain how I can use javascript (I am assuming this is the best
way to do it) to add two field values together. I.e. field 1 plus field 2
equals field 3 (this is in a php form)

Also how can I set a field to be a value depending on what the user selects,
i.e. they may have eight items to select from and each one has a different
value.

The above javascript will then use that value to add to another field value
to give a me a total value....

## Calculate Field Based On Another Field In Form

Jul 23, 2005

Is there a way I can calculate a field in a form based on another field in
the same form. When clicking submit, both values should be posted to the
next page. I want to be able to type in a value in one field, and
automatically in a second field the value*1,36 should appear.

## Calculate A Field Value Based On An Other Field

Jun 2, 2011

I have designed an online registration system for a non profit in ASP/SQL. After the members register for classes they are automatically redirected to an invoice page with class fees. At the bottom of the page I have a Total Fees field of all the classes. The member is supposed to pay this amount to our organization.

Question: We decided to do an online payment this year and would like to calculate a 2% additional amount on the Total Fees. This amount is paid to the Payment Merchant site. We cannot afford to lose the 2% since we are a non profit.

1) Add a new field under the Total field
2) And calculate the 2% additional fees and do a Grand Total.

## Calculate 2 Values

May 13, 2005

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 .

## Calculate Values And In Which Order?

Nov 9, 2011

i=y=1;i<y; result:false (this makes sense to me)

Im wondering about how JavaScript does the following calculations to get those results? Please explain it if you do.

## Auto-calculate Values

Sep 6, 2007

I am thinking of how to write the code for this:

There are 3 textboxes, each labeled:

TOTAL
rd_PROPERTY_VALUE
LTV

Both “TOTAL” and “rd_PROPERTY_VALUE” allow you to enter any number (e.g. 10000, 2500, 12345, 100.10, etc.). So whenever I enter numbers in both of them, the 3rd read-only textbox will automatically divide TOTAL by rd_PROPERTY_VALUE then times it by 100 and show the calculated value in the “LTV” field.

For instance it should mathematically appear like this:
(TOTAL / rd_PROPERTY_VALUE) * 100 = LTV

Can anyone give me any references to this?

## How To Calculate Decimal Values

Sep 12, 2011

need to calculate decimal values

example 42.925181855342466 + 58.64

but i get this \$58.64\$42.93, i know js is easy on int values

Code:

Esanda.prototype.calculateFornightCharge = function(payIndex,dueIndex)
{
var oThis = this;
alert("Pay index" + " " + payIndex + " " + "Due index" + " " + dueIndex);
var pi = (payIndex-1);

[Code].....

## Auto Calculate The Values

Dec 9, 2011

how to It calculates amount column value by multiplying quantity to amount.i.e. amount=qty*rate and gross total is sum of all the array elements in amount.Here I want to add two more columns viz vat% and vat amount.Simply it will be amount*vat% / 100.Can anyone please tell me how I can do that?Other thing is, is it possible to separate the 5% vat and 12.5% vat values and display the total of them in respective column?

Code:

<html>
<script type="text/javascript">

[code]....

## Calculate Multiple Values

Apr 17, 2007

I have a table which I have made work where I put some values in and the script works out the result on an onChange event.

My question is that I want to make the table rows populate from a database so each of the javascript values will have to be unique for the value to be worked out on a specific row calculation.

The code as it is works out the single value but how would i go about using the mechanics of the code to apply to multiple lines in the table. Code:

## How To Calculate / Add Values To Total Amount

Oct 14, 2011

I followed a tutorial online on how to use Javascript to calculate total price. Everything works fine, when all the dropdown select value has it's own value and does not correspond to each other.

Eg :
Cake Type : Round \$4.00
Cake Color : Red \$3.00
Cake Filling : Raspberry \$4.00
So total is \$11.00

The problem comes when you want to add Cake Layers and the price of Cake Color changes based on No of Layers - 1 Layer , 2 Layer and so on. E.g.:
Cake Layer : Layer 1 \$5.00 | Layer 2 \$2.50 | Layer 3 \$2.50 (for color Orange)
Cake Layer : Layer 1 \$7.00 | Layer 2 \$4.00 | Layer 3 \$4.00 (for color Red)

Do I have to use if and else conditional statement for every possibility? I am just a beginner. Attached below is the example code I have so far:
var filling_prices= new Array();
filling_prices["None"]=0;
filling_prices["Lemon"]=5;
filling_prices["Custard"]=5;
filling_prices["Fudge"]=7;
filling_prices["Mocha"]=8;
filling_prices["Raspberry"]=10; .....
function getFillingPrice(){

Is there a better way of simplifying this calculation method? How do I change the price of form values based on selected values on previous dropdown.

## Calculate Checkbox And Drop Down Values?

Oct 19, 2009

I have the following code working with the checkbox options but once I added a drop down menu with values, it doesn't calculate it. I've done some different things to try to add the drop down to the function but nothing would work that I've tried so far.

I have it setup so when a box is unchecked, that option is taken off the price, the drop down should do the same to switch between the options price.

[Code]...

## Calculate Age Based On Dob Field?

Nov 23, 2010

I am trying to calculate age based on the date of birth input into a text field.
the date field should allow users to enter a one or two digit month, one or two digit date and a two or four digit year. Users should be able to enter any of the following date formats: 11-2-10, 1-25-2010, or 01/25/2010. On some days it works and others it wont, like 11-1-91 returns that the user is under 18.

function checkAge(){
var stDate = document.getElementById("birth").value;
var dayPartToDate = parseInt(stDate.substring(0,2),10);
var monPartToDate = parseInt(stDate.substring(3,5),10);

[Code]....

## Resetting Values When Hitting Calculate Button?

Nov 3, 2011

I am having trouble with figuring a way to set my loop up to reset values of the different coin values. Example, when I put in 78, and click calculate, it tells you how much of each coin would be given back. My problem is that I set it up and run it, but when I put different values in back to back to calculate, some of the fields don't reset.

var change_out = function(){
do {
var money = document.getElementById("cents").value;

[code].....

## Calculate Values From Multiple Checkboxes Plus One Textbox?

Feb 14, 2010

My platform PHP, MySQL. I am not very familiar with Javascript.

I need to calculate value of each Checkbox List (Price) plus value from one TextBox (PrixBase)

I have found this JQuery which works great in my case, but it make append two numbers instead calcul addition

Code:
<script language="JavaScript" type="text/javascript">
<!--//--><![CDATA[//>

[Code]....

modify this code to make sum (all checkboxes + one textbox)

## JQuery :: Calculate Values From Multiple Checkboxes And One Textbox?

Feb 14, 2010

My platform PHP, MySQL. I am not very familiar with Javascript. I need to calculate value of each Checkbox List (Price) plus value from one TextBox (PrixBase) I have found this JQuery which works great in my case, but it make append two numbers instead calcul addition

<script language="JavaScript" type="text/javascript">

[code]....

## Automatically Calculate The Result When User Enters Values?

Sep 22, 2010

I want to automatically calculate the result when user enters values.. but keypress or keyup is not working...

Code:

<label>No 1</label>
<input type="text" name="n1"/><span></span>
<label>No 2</label>

[Code]....

## Calculate 2 Form Values With Price And Sums With Total

Sep 20, 2009

Formfield.anzahl1 = number entered by customer
Formfield.Price1 = Ergebnisfeld1
e.g.
Anzahl1= 1
Price = 270
*if Anzahl1 = 2 then Price = 270*2

I need to do this for two form option. 2nd field would be as follows

Formfield.Anzahl2= number entered by customer
Formfield.Price2 = Ergebnisfeld2
Then Formfield.Total = Ergebnisfeld1 + Ergebnisfeld2

How can I convert these above to javascript?

## Comma Separated Values - Form That Gets Values That A User Has Selected From A List Menu Field

Jul 6, 2009

I have a form that gets values that a user has selected from a list menu field, that end up like this added to the URL:[url]

Instead of the Field being mentioned more than once, how can I have it where it could mention the field once with the values coma separated eg:[url]

Would I use JS to change the URL? or VBscript?

## Form Validation Field Values Not Saved If One Field Is Not Completed/invalid?

Feb 3, 2009

The following form validation script works, currently if one of the five fields are completed, a message appears the remaining field(s) must be completed etc. Although the information the user has inputted in the first field is cleared. How can this information be available, if there is one problem in the form it doesn't make sense that the user must re-input all the information again. I look forward to hearing your response,

function validate_form ( )
{
valid = true;

[code]....

## How To Use A Field Value To Auto Fill Other Field Values

Sep 17, 2009

Not exactly sure this is the right forum to post this but just to give it a shot.I am relatively new to programmming...I am currently working on a web appliation using MySQL DB and use PHP/SQL.I have a web form i have created. What i want to achieve is that when a user fills in one of the fields...a text field, i want 8 other fields to be AUTO filled with different values related to the one the user filled in

## Sum Of Array Elements - Add And Delete Dynamic Rows And Auto Calculate The Amount Field By Multiplying Qty And Rate

Mar 21, 2011

This is my code to add and delete dynamic rows and auto calculate the amount field by multiplying qty and rate.

[Code]...

## Copy And Paste Form RTF Document Into Field In Asp Form Cause It To Bypass Field Length And Javascript Validation - How To Overcome?

Jul 23, 2005

I have a web form with several fields. If I copy & paste from a RTF document into a field, the javascript validation and field length are bypassed and cause the form to fail.

## Sum Text Field Values

Jul 20, 2005

Was just wondering how I can sum values from different textboxes,..
I used "+" but this adds the values together rather then creating a sum of
them.

e.g.

var x = document.clear.field1.value; (e.g. 10)
var y = document.clear.field2.value; (e.g. 11)

var sum = x + y (that comes up with 1011) rather then 21.
How can I add them together so the result is 21?

## Validate A Field Which Could Have Several Different Values?

Jan 29, 2009

In javascript - is it possible to validate a field which could have several different values... such as:

"1BVF"
"9IUJ"
"QW-9"

I have googled - but can only seem to find single validations, so was wondering if I am barking up the wrong tree.

## Populating Field Values By Browser

Sep 2, 2009

If member clicked 'remember me' on confirm alert after entering the loginid and password, browser will save this information. But if some other clicks on register/join on the same browser, the login and password fields are populating by default. If member didn't say 'remember me', like saying 'not now' or 'never for this site', it is not populating. Note: Both the form names have the same name. Is there anyway to fix it without changing the form name.

## Values Get Removed After Adding Another Field

Nov 21, 2009

I type something on the current textarea/input and all the values get removed after I add another field.

<script language="Javascript" type="text/javascript">
<!--
if(!document.getElementById) return; //Prevent older browsers from getting any further.
var field_area = document.getElementById(area);
var all_inputs = field_area.getElementsByTagName("input"); //Get all the input fields in the given area.
//Find the count of the last element of the list. It will be in the format '<field><number>'.

If the
//field given in the argument is 'friend_' the last id will be 'friend_4'.
var last_item = all_inputs.length - 1;
var last = all_inputs[last_item].id;
var count = Number(last.split("_")[1]) + 1;

//If the maximum number of elements have been reached, exit the function.
//If the given limit is lower than 0, infinite number of fields can be created.
if(count > limit && limit > 0) return;
//Older Method
field_area.innerHTML += "<li><textarea id='steps' name='steps[]' rows='5' cols='40'>