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# auto compute

9:50 am on Aug 28, 2011 (gmt 0)

#### New User

joined:Aug 28, 2011
posts: 3

HI!
is it possible create an auto pro rata calculator in java where there are four [4] boxes. first box should be where we could enter the customer's plan [29,39,40 etc.] and it should be divided with what ever i will enter on the second box w/c will be for the number of days in a month [28,29,30,31]. the 3rd box should be where i can enter the number of days the cust. was able to use the service and it needs to be multiplied from box 2. 4th box should be a read only box where the pro rata will be displayed.

so:

[box 1] divided "/" by [box 2] multiplied "*" by [box 3] equals "=" to box four

#### lostdreamer

8:55 am on Aug 29, 2011 (gmt 0)

#### Junior Member

joined:July 8, 2010
posts: 114

That shouldn't be to hard....

``<script>function calculate() {var frm = document.getElementById('calculator');frm['box4'].value = ( frm['box1'].value / frm['box2'].value ) * frm['box3'].value;// Stop form from submittingreturn false;}</script><form id="calculator" onsubmit="return calculate();"> <input type="text" name="box1"><br> <input type="text" name="box2"><br> <input type="text" name="box3"><br> <input type="text" name="box4" READONLY><br> <input type="submit" value="Calculate" onclick="calculate();"></form>``

9:23 am on Aug 29, 2011 (gmt 0)

#### New User

joined:Aug 28, 2011
posts: 3

thank you so much sir! you save my life!