Prevent digital signature if fields are blank

[DKinsley]

I am trying to verify a few fields are populated before the user can digitally sign the form. If the fields are blank, I would like to prevent the digital signature window from appearing.  How do I do that?

Here's my script:

var vSignature
if(xfa.form.form1.execValidate() == true){
 vSignature = this.rawValue;
}
else{
xfa.host.messageBox("At Least One Required Field Was Left Blank");
}

[Santosh_Nangunoori · Accepted solution]

Add null check (or any validation of the fields that you are expecting to be populated) in the preSign event of digital signature field , if validation fails then cancel the action after providing a message

Can you attach your sample form?

--Santosh

http://about.me/nskumar

[DKinsley]

Thank you for your reply.

Unfortunitly I can not attach a sample form. My understanding is the preSign event only works for versions 9 and higher. My form needs to be used with versions 8.1 and higher.

[Santosh_Nangunoori]

Acrobat 8.x & Adobe Reader 8.x is already EOLed https://www.adobe.com/support/products/enterprise/eol/eol_matrix.html#86

Adobe Reader	8.x	Windows and Macintosh	11/3/2006	11/3/2011

It's better to recommend your users to upgrade to latest versions. Is it an enterprise wide installation?

--Santosh

http://about.me/nskumar

[DKinsley]

Yes it is an enterprise wide installation. I will notify the Systems Group.

Thanks

[Santosh_Nangunoori]

In case if you had to achieve this for Reader 8.x versions

1. You can lock the signature field on initialization or documentReady

2. Add a button for validation check

3. Do validation when the user clicks the button added in step # 2

4. If all validations are succesful then unlock the signature field

--Santosh

[DKinsley]

Thank you for your reply. I will give this a try.