How to perform a calculation only if a field is empty

I have the following script to generate a random 4-digit invoice number.

this.getField("INVOICE_No").value = Math.floor (1000 + Math.Random () * 9000);

It works fine, but if I hit the action button several times he continues to change the invoice number.

Is there a way for her to run the script only if the field is empty?

Yes, you just add something like:

var f = getField ("BILL No.");

If (! f.valueAsString) {}

f.Value = Math.floor (1000 + Math.Random () * 9000);

}

Tags: Acrobat

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