auto compute

[sleepyheadking]

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]

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 submitting
return 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>

[sleepyheadking]

thank you so much sir! you save my life!