How to count ONLY fields with a specific value

Question

I modified the code below from the API reference to count combobox fields with a value of "MT" so I could total the number of a specific choice the form user input.
var count = 0;
for (var i=0; i<this.numFields; i++)
var fname = this.getNthFieldName(i);
if ( this.getField(fname).type == "combobox" && this.getField(fname).value == "MT" ) count++;
this.getField("mTurb").value = count.value;
Here's the problem: I tried to use a similar script, modified only slightly from this form, in another total field to tally a different choice made with comboboxes and the script continues to tally the first choice. An example of one of the modified versions of the script is below.
var gcount = 0;
for (var i=0; i<this.numFields; i++)
var gname = this.getNthFieldName(i);
if ( this.getField(gname).type == "combobox" && this.getField(gname).value == "MT" ) gcount++;
this.getField("gPack").value = gcount.value;
I suspect I'm just missing something painfully obvious to seasoned scripters, but I can't seem to figure it out and I need this script to be able to count the number of 9 different options in the comboboxes.

Answer 1

OK, you can use a script like the following as the custom calculate script for the text fields that perform the counts:
// Custom calculate script for text field
(function () {
    // Declare and initialize variables
    var fn, s = "MT", count = 0;
    // Loop through the combo boxes
    for (var i = 1; i < 25; i++) {
        // Determine the current field name
        fn = "M" + util.printf("%02d", i));
        // See if the field value matches
        if (getField(fn).valueAsString === s) count++
    // Set this field value to the count
    event.value = count;
Change the value of the "s" variable to match the item that you want to count. The first and last lines prevent the unnecessary creatio of global variables, which is good. It also makes it easy to transfer to a more general document-level routine, which would be event better, something like:
// Custom calculate script for text field
function getCBCount(s) {
    var fn, count = 0;
    // Loop through the combo boxes
    for (var i = 1; i < 25; i++) {
        // Determine the current field name
        fn = "M" + util.printf("%02d", i));
        // See if the field value matches
        if (getField(fn).valueAsString === s) count++
    // Set this field value to the count
    event.value = count;
You would then call this function from the individual text boxes with the following custom calculate script:
getCBCount("MT");
and replace "MT" with the vlaue you want to count.