Sign document with Form Field signature - advanced

GroupDocs.Signature provides FormFieldSignOptions class to specify different options for Form Field signature. The Form Field signature is special document predefined input field control with unique name inside the document content that expects some input from user.

At the moment GroupDocs.Siganture supports creation of Form Field signatures for Pdf documents only.

The FormFieldSignOptions class contains one FormFieldSignature object to put to the document.

Here are the list of different Form Field signature classes that could be set to FormFieldSignOptions

TextFormFieldSignature - represents text input form field on document page.
CheckboxFormFieldSignature - represents check box field on the document page.
DigitalFormFieldSignature - represents digital signature input form on document page.

Here are the steps to add Form Field signatures into document with GroupDocs.Signature:

Create new instance of Signature class and pass source document path as a constructor parameter.
Instantiate the FormFieldSignOptions object according to your requirements.
Instantiate one of the derived classes from FormFieldSignature object. It could be TextFormFieldSignature, CheckboxFormFieldSignature or DigitalFormFieldSignature.
Set FormFieldSignOptions.setSignature property with created object.
Call sign method of Signature class instance and pass FormFieldSignOptions to it.
Analyze SignResult result to check newly created signatures if needed.

Sign Pdf document with Form Field signature

This example shows how to add Form Field signature to document. See SignResult

Signature signature = new Signature("sample.pdf");
 
List<SignOptions> listOptions = new ArrayList<SignOptions>();
 
// instantiate text form field signature
FormFieldSignature textSignature = new TextFormFieldSignature("tbData1", "Value-1");
// instantiate options based on text form field signature
FormFieldSignOptions optionsTextFF = new FormFieldSignOptions(textSignature);
optionsTextFF.setHorizontalAlignment(HorizontalAlignment.Left);
optionsTextFF.setVerticalAlignment(VerticalAlignment.Top);
optionsTextFF.setMargin(new Padding(10, 20, 0, 0));
optionsTextFF.setHeight(10);
optionsTextFF.setWidth(100);            
 
// instantiate text form field signature
CheckboxFormFieldSignature chbSignature = new CheckboxFormFieldSignature("chbData1", true);
// instantiate options based on text form field signature
FormFieldSignOptions optionsTextCHB = new FormFieldSignOptions(chbSignature) ;           
optionsTextCHB.setHorizontalAlignment(HorizontalAlignment.Center);
optionsTextCHB.setVerticalAlignment(VerticalAlignment.Top);
optionsTextCHB.setMargin(new Padding(0, 0, 0, 0));
optionsTextCHB.setHeight(10);
optionsTextCHB.setWidth(100);    
 
// instantiate text form field signature
DigitalFormFieldSignature digSignature = new DigitalFormFieldSignature("dgData1");
// instantiate options based on text form field signature
FormFieldSignOptions optionsTextDIG = new FormFieldSignOptions(digSignature);           
optionsTextDIG.setHorizontalAlignment(HorizontalAlignment.Right);
optionsTextDIG.setVerticalAlignment(VerticalAlignment.Top);
optionsTextDIG.setMargin(new Padding(0, 50, 0, 0));
optionsTextDIG.setHeight(10);
optionsTextDIG.setWidth(100);            
 
listOptions.add(optionsTextFF);
listOptions.add(optionsTextCHB);
listOptions.add(optionsTextDIG);
 
// sign document to file
SignResult signResult = signature.sign("signedSample.pdf", listOptions);
// analyzing result
System.out.print("List of newly created signatures:");
int number = 1;
for(BaseSignature temp : signResult.getSucceeded())
{
    System.out.print("Signature #"+ number++ +": Type: "+temp.getSignatureType()+" Id:"+temp.getSignatureId()+
            ",Location: "+temp.getLeft()+"x"+temp.getTop()+". Size: "+temp.getWidth()+"x"+temp.getHeight());
}

More resources

GitHub Examples

You may easily run the code above and see the feature in action in our GitHub examples:

Free Online App

Along with full-featured .NET library we provide simple, but powerful free Apps.
You are welcome to eSign PDF, Word, Excel, PowerPoint documents with free to use online GroupDocs Signature App.

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