How can I count only text fields that have been used?

Hi,
I'm using Livecycle Designer for a dynamic form. I have a section of the form that contains field for the user to enter goals and then rate the goal. I'd like to count only the text fields with entries and then have the total number of rates divided by the number of text field entries.
Row 1 , column 1 -- Goal is to pick up 5 apples. Row 1, column 2 - the rate given is 5
Row 2, column 1 - Goal is to pick up 5 pears. Row 1, column 2 - the rate given is 5
Two goals for a total rating of 10 --- 10 divided by 2 = 5
Is it possible to count only those fields that are populated?
Also, is it possible to create an error message if the user entered 5 goals but only rated 4 of them?

You could do a simple check for null and increase a counting variable if there's a value in the field. Here's a sample:
var goalCount = 0;
if (field1.rawValue != null){
goalCount = goalCount + 1;
if (field2.rawValue != null){
goalCount = goalCount + 1;
if (field3.rawValue... etc.
this.rawValue = totalPoints/goalCount;
where totalPoints is a sum of the values in the goal fields. This script is javascript and should be placed in the calculate event of the field showing your average score.

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