Change the one line of code to:
if (nWBC1 !=0 && nAFN != 0) {
If you want to use the same calculation for a number of rows, you can create a function that all of the calculated fields can use, but it would depend on the field names you're using. If you're just changing the number at the end, the function could be:
function calc1(num) {
// Assigning the variables
var PW = "PlotWt" + num;
var WBC = "WetbuConversion" + num;
var AF = "AcreFactor1" + num;
// Getting the values
var nPW = this.getField(PW).value;
var nWBC = this.getField(WBC).value;
var nAF = this.getField(AF).value;
// clear the result field value
event.value="";
// see if we have a non-zero divisor
if (nWBC !=0 && nAF != 0) {
//Actual division operation
event.value = nPW / nWBC / nAF;
}
}
You can then call it in the field's custom Calculate script like:
calc1(1); // Row 1
For row #5, it would be:
calc1(5); // Row 5
This could be simplified a bit if you changed your field naming scheme to make it easier to extract the row number. That way you wouldn't have to pass it as I've shown.
To create a document-level script to place the function, select: Advanced > Document Processing > Document JavaScripts > Add
