How do I have Adobe Acrobat 9.0 calculate the minimum of 10 fields BUT ignore empty fields?

Question

How do I have Adobe Acrobat 9.0 calculate the minimum of 10 fields BUT ignore the field if it is empty? Currently it counts blanks as 0 so when it comes up with the minimum it will always show 0 unless all 10 fields have values in them.

Answer 1

You could loop through the fields and add the non-blank values to an array, and use the Math.min method to get the minimum. Here's an example custom Calculate script:
// Custom calculate script
(function () {
    // Array to hold non-blank field values
    var fa = [];
    // Loop through the fields...
    for (var i = 1; i < 11; i += 1) {
        // ...get the current field value, as string...
        var v = getField("text1." + i).valueAsString;
        // ...if not blank, add value to the array, as a number
        if (v) fa.push(+v);
    // Set this field's value to the minimum value in the array, otherwise blank
    event.value = fa.length > 0 ? Math.min.apply(null, fa) : "";
This assumes the fields are named "text1.1", "text1.2", ..."text1.10" and that they're numeric. This type of field naming simplifies the code, so it would be good to use something similar and adjust the getField statement to match.