PDF Form: Multiple Choice sheet that displays a percentage based on answers provided

Question

Hello,
Im trying to create a form that has 4 multiple choice questions, the answers to each being the values 0,1,2,3,4, 5 or N/A.
Once answers are given, I'd like the percentage to appear on the form.
I can't figure out how to do this, as the total fluctuates depending on if the response to one or more questions is "N/A".
I.e. if the answers were as follows: 4,4,4,4, the percentage would be 80% (16/20).
However, if the answers were: 4,4,4,N/A, the percentage would also be 80% (12/15) and NOT 60% (12/20).
I figure its a javascript thing - but alas I do not know Java.
Help Please!

Answer 1

So you want to compute the percentage of the non-"N/A" selections using the count of selected items * 5 as the denominator and then use that value to divide the sum of the values for the non-"N/A" selections.
Has a default checked value been selected.
Since the averaging is not just computation of the mean based on the item count, you to create a custom JavaScript calculation.
var aNames = new Array("Radio Button.0", "Radio Button.1", "Radio Button.2", "Radio Button.3"); // array of field names
var aValues = new Array();
var sum = 0;
var count = 0;
var oField;
event.value = "";
for(i = 0; i < aNames.length; i++) {
// get values of fields into array;
oField = this.getField(aNames[i]);
if(oField ==  null) app.alert("Error getting " + aNames[i] + " field!", 0, 1);
else aValues[aValues.length] = oField.value;
if(aValues.length != 0) {
// sum the non-N/A vlaues in the array;
for(i = 0; i < aValues.length; i++) {
if(String(aValues[i]).toUpperCase() != "N/A") {
sum += Number(aValues[i]); // sum the non-N/A values;
count++; // count the non-N/a values;
// compute average if count not zero;
if(count != 0) event.value = sum / (count * 5);