Checking to see if a document has a digital signature

Question

Hello,
I have created a stand alone static PDF document using the Designer 7.0.
I have some code that checks the document to ensure the proper data fields have been filled out before the user can sign the form. After signing the form the, the user is supposed to click a submit button where 2 things happen, first the data is sent for processing (do not the the digital signature info here) and second a copy of the PDF is save for archiving purposes (with digital signature).
What I need to know is how do I verify the digital signature field is not null or empty?
If I check its raw value, before and after are the same (null or empty even thought I can see that the form has been signed by looking at the screen). If I used the signatureInfo functions available in professional, I get a security violation error. The form is filled out using Adobe Reader and the forms have digital signature right added via the Reader Extensions v6.0.
Any help is greatly appreciated.
Thanks
Ben

Answer 1

Hi Ben, First advice is upgrade to designer 7.1. There are major improvements in the stability of designer. 7.0 kept crashing on me constantly.
I created a little function which should help you out.
function isSigned(sigField){
var oState = event.target.getField(sigField).signatureInfo().status;
/* if (oState == -1)
//app.alert("Not a signturefield");
else if (oState == 0)
//app.alert("Signature is Blank");
else if (oState == 1)
//app.alert("Unknown Status");
else if (oState == 2)
//app.alert("Signature is invalid");
else if (oState == 3)
//app.alert("Sig of Document is valid, identity of signer could not be verified");
else if (oState == 4)
//app.alert("Sig of Document is valid, identity of signer is valid");
else
//app.alert("Value was " + oState); */
return oState;
You need to pass this function the fully qualified SOM so if the signature field is in form.subform.page1.sigField you would call it like this isSigned("form[0].subform[0].page1[0].sigField[0]").
Good luck.