I need help converting an excel formula to javascript for a fillable form.

Question

Here is the scenario,
If a person travels for 1 or 2 days we pay out a mealsrate of 75% per day. If 3 or more days we pay # days less 2 days * 25%. I hope that makes sense.
V7 = Days, F14 = Mealsrate
Formula in Excel
=IF($V$7 = 1,$F$14*0.75,($V$7*$F$14)-(($F$14*0.25)*2))  and it works.
I am VERY NEW to javascript (like yesterday) so don't laugh. I really have no idea what I am doing, but I was trying. Here is what i got. (by the way, It doesn't work)
if(this.getField( ("Days").value=="1")){
var f =this.getField("Mealsrate");
event.value= f.value * .75;
}else event.value = (Days * f.value)- (f.value *.25)*2;
I appreciate all the help i can get.
Tracie
I'll be back on Monday, I hope I can find my post.

Answer 1

OK, that Excel formula can be reduced a bit. The following custom Calculate scipt will do what the formula does:
// Custom Calculate script
(function () {
    // Get the inputs
    var days = getField("Days").value;
    var rate = getField("Mealsrate").value;
    // Set this field value
    if (days == 1) {
        event.value = 0.75 * rate;
    } else {
        event.value = (days - 0.5) * rate;
It would make sense to add additional code to deal with negative numbers in either of the input fields.
Edit: corrected a typo