How to verify a pdf is signed?

[Former Community Member]

Hello =)

I'm working with LiveCycle ES4 designing a form and I want my form to be filled by Adobe Reader users.

In this form, I have a signature field which I want to verify before the user submits the document.

I'm using this code in the click event of the button:

     var signature = event.target.getField("Form.subForm.signature");

     var signatureState = signature.signatureValidate();

     if (signatureState == 0){

          xfa.host.messageBox("Please sign the document.");

          }

     else if (signatureState == 1 || signatureState == 2){

          xfa.host.messageBox("Please use a valid signature.");

          }

     else if (signatureState >= 3){

          event.target.submitForm({cUrl:"mailto:xxxxxxxx@xxxx.xxx", cSubmitAs:"PDF"});

          xfa.host.messageBox("Form submited.");

          }

I've extended the features of this form in Reader using Acrobat Pro Extended.

The problem is..this line:

     var signature = event.target.getField("Form.subForm.signature");

.. isn't working the way it's supposed to. When I press the button in the signed, or unsigned, document, this variable is null.

Can PLEASE anyone explain me why?

[Magus069]

You validating digital signature?!?

Not sure which one you really need, but check these out, your solution might be there

Digitally signing pdf documents

http://help.adobe.com/en_US/livecycle/10.0/ProgramLC/WS624e3cba99b79e12e69a9941333732bac8-7c45.html

Verifying digital signatures

http://help.adobe.com/en_US/livecycle/9.0/programLC/help/index.htm?content=000920.html

Setting up signature validation:

http://help.adobe.com/en_US/acrobat/X/standard/using/WS396794562021d52e-4a2d930c12b348f892b-8000.htm...

Hope this help!

[Santosh_Nangunoori]

Ana,

Is it possible for you to upload sample form ?

--Santosh

-----------------------

Steps to attach document

1. Click Reply to this comment
2. Click "Use advanced editor" on the top right corner of editor
3. You should see a Browse button to attach file

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[Former Community Member]

Hi, Kumar =)

Thanks for replying.

I don't see a browse button to upload my sample. Maybe it's disabled.

Can you do a simple form with just a signature field and a button? Like this:

form1

     (Master Pages)

          Page1

               (untitled Content Area)

     Form                              *page*

          subForm                 *Subform*

               signature       *signature field*

               submit                 *button*

In the signature field, disable Lock Fields After Signing.

In the click event of the button paste this code:

     var signature = event.target.getField("Form.subForm.signature");

     //Signature is always null. Why?

     xfa.host.messageBox("signature = " + signature);

     var signatureState = signature.signatureValidate();

     if (signatureState == 0){

           xfa.host.messageBox("Please sign the document.");

           }

     else if (signatureState == 1 || signatureState == 2){

          xfa.host.messageBox("Please use a valid signature.");

          }

     else if (signatureState >= 3){

          //event.target.submitForm({cUrl:"mailto:xxxxxxxx@xxxx.xxx", cSubmitAs:"PDF"});

          xfa.host.messageBox("Form submited.");

          }

Then preview the pdf and click submit.

I know it's to ask a lot..but if you have the time..thanks! =)

[Former Community Member]

Hi again, Magus069 =)

Thanks for replying.

I just want to check through a button if the document is signed or if the signature is valid.

It should be an easy thing to do. But the line I pointed above isn't working.

Can you help me?

Thanks =)

[Former Community Member]

Hi, everyone =)

..I found the answer I was looking for here:

http://forms.stefcameron.com/2008/11/05/digital-signature-field-status/

..in the available sample.

In this code line:

     var signature = event.target.getField("Form.subForm.signature");

I was giving the wrong path to the digital signature field.

Apparently it's a bit more tricky than the easy ctrl + click trick. The correct path turned out to be Form[0].subForm[0].signature[0].

In the sample I downloaded in the upper link there's a function that gives this expression, SOM Expression (I think).

I'm not an expert, so I cannot explain any further but the problem I was having is solved.

I hope this helps anyone who gets here with the same issue. =)

Thanks again! =)