How do I create an Acrobat Pro form with optional signatures?

[Carrie0101]

I'm creating a form in Acrobat Pro from an existing PDF using the Prepare Form feature. I need a signature in one of two places. One place is to sign if the signer is 18+. There is a separate place for the signature if signing for a minor. I can only see how to require a signature in both places. How do I request the signature for either or?

[try67]

Do you have an age field, or DOB, or something like that?

[Carrie0101]

Yes there is.

[try67]

OK... Which one?

[Carrie0101]

DOB text field

[try67]

You can use this code as that field's custom Validation script, then (adjust the date format pattern and the names of the signature fields, as needed):

if (event.value) {
	var age = calcAge(event.value, "mm/dd/yyyy");
	this.getField("SignatureMinor").required = (age<18);
	this.getField("SignatureAdult").required = (age>=18);
} else {
	this.getField("SignatureMinor").required = false;
	this.getField("SignatureAdult").required = false;
}

function calcAge(dobValue, dateFormat) {
	var dob = util.scand(dateFormat, dobValue);
	var now = new Date();
	var age = now.getFullYear() - dob.getFullYear();
	if (now.getMonth() < dob.getMonth()) {
		age--;
	} else if (now.getMonth()==dob.getMonth() && now.getDate() < dob.getDate()) {
		age--;
	}
	return age;
}

[Carrie0101]

You are amazing. Thanks for your help! I knew there had to be a way.