How do I auto-calculate the number of appearances of a particular value in multiple fields?

Question

Hi folks!  Some assistance with this matter would be greatly appreciated.
I have a form where I need to have calculated the number of appearances of certain values in a dropdown list.  The total number of each would then be calculated and displayed in separate fields.
Here's the exact situation:
I have 22 dropdown fields labeled Code1 through Code22.  The export value for each of these can be any one of 21 different values: 1; 2a; 2b; 3; 4; 5; 6a; 6b; 6c; 6d; 6e; 7; 8; 9a; 9b; 10a; 10b; 10c; 10d; 10e or 10f.
The idea then is to have the total number of each value appear in a separate field.
E.g., the form user makes a "10a" selection in any three of the Code1 through Code22 fields; the number "3" will then appear in a separate auto-calculated field reserved for total number of "10a" values.  If the user makes two "9b" selections, the number "2" would appear in a separate field reserved to show the total number of "9b" values.
I hope that's clear.
Thank you, all, for your help!

Answer 1

I would use a doc-level function to do it, and provide the value to look for as a parameter. So the function will look like this:
function countValues(s) {
    var total = 0;
    for (var i=1; i<=22; i++) {
        var f = this.getField("Code"+i);
        if (f.value==s)
            total++;
    return total;
Then as the custom calculation script of the text fields you enter something like this:
event.value = countValues("10a");
Or like this:
event.value = countValues("9b");
etc.