Forms                                       

 

An interactive form (sometimes referred to as an AcroForm) is a collection of fields for gathering information interactively from the user. Under the hood, PDF form fields are a type of PDF annotation called widget annotations.

 

ComPDFKit PDF SDK fully supports reading, filling, creating, and editing PDF forms and provides utility methods to make working with forms simple and efficient.

 

Supported Form Fields

 

ComPDFKit PDF SDK supports all form types specified by the PDF specification (such as text boxes, checkboxes, radio buttons, drop-down lists, pushbuttons, and signatures).

 

CPDFWidget is the base class for all form fields, and CPDFWidget is subclass for CPDFAnnotation. A CPDFWidget object by itself is not useful, only subclasses (CPDFCheckboxWidget, CPDFRadiobuttonWidget, etc.) are interesting. In parsing a PDF however, any unknown or unsupported form fields will be filtered out.

 

We have to differentiate between field types and annotation objects:

 

Type	Annotation Object
Check Boxes	CPDFCheckboxWidget
Radio Buttons	CPDFRadiobuttonWidget
Push Buttons	CPDFPushbuttonWidget
List Boxes	CPDFListboxWidget
Combo Boxes	CPDFComboboxWidget
Text	CPDFTextWidget
Signatures	CPDFSignatureWidget