# Thread: Javascript calculation multiple fields

1. Registered User
Join Date
Jan 2013
Posts
2

## Javascript calculation multiple fields

Hi there,

I am creating a gym membership form - it will offer two different types of memberships at 3 different locations.

All of these options could be housed in a drop down - or not.

Once the user has selected their membership option I will need to add together a couple of lines of fees : so a start up fee + admin fee + (1week of cost+remaining number of days of cost in the week of purchase)

The start up fee and admin fee are known costs \$99 and \$49. 1 week costs=\$10.99. So the mathematical formula in the brackets would be ( if purchased on a sat) \$10.99+(10.99*6)/7

The form is a basic payment form other than these calculations.
But any assistance would be greatly appreciated - I'm in the midst of learning javascript - but I'm just not able to tackle this type of calculation as yet.

2. Registered User
Join Date
Nov 2002
Location
Flint, Michigan, USA
Posts
652
If I understand correctly, would the equations be:

Sunday=\$158+\$10.99*7/7
Monday=\$158+\$10.99*6/7
Tuesday=\$158+\$10.99*5/7
Wednesday=\$158+\$10.99*4/7
Thursday=\$158+\$10.99*3/7
Friday=\$158+\$10.99*2/7
Saturday=\$158+\$10.99*1/7

If so, use the Date function to get the day number, subtract that from 7, and use the result as the multiplier in:

Amount=\$158+\$10.99*(7-DayNum)/7

3. Registered User
Join Date
Jan 2013
Posts
2
function myDateFunction()
{
var date = new Date();
var today = date.getDay();
var daily = 10.99/7;
var days = [1, 7, 6, 5, 4, 3, 2];

// select the tag with the the id Amount
var x = document.getElementById('Amount');

// insert the value into the input
x.value = parseFloat(99 + 49 + (daily * days[today])+10.99).toFixed(2)

}

I have this so far and it's working...
But I need each of the amounts for : admin, start up and pro rata to be fed into their input fields on change - the change being the user's selection of this type of membership or another that doesn't have a start up fee ( so exactly the same but 0=start up fee)

This next step has got me stuck!

Many thanks for your help!

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