• PdfInteractiveFormFieldAdditionalActions.Keystroke - performs a JavaScript code after the user has changed a form field data using keyboard
• PdfInteractiveFormFieldAdditionalActions.Format - performs a JavaScript code before formatting a form field value for display
• PdfInteractiveFormFieldAdditionalActions.Validate - performs a JavaScript code after a form field value is changed
• PdfInteractiveFormFieldAdditionalActions.Calculate - performs a JavaScript code in case when the value of form field is subjected for recalculation

PdfAnnotation.ActivateAction and PdfAnnotation.AdditionalActions properties allow to define the actions, connected with the visual appearance of form. For example, the action that should be performed if the mouse button is clicked above annotation or the action that should be performed when the page with annotation has become visible.

The interactive form may include a field, the value of which must be recalculated if the value of any other field has changed. PdfDocumentInteractiveForm.CalculationOrder property allows to define a list of fields selected for recalculation. The recalculation is performed in order of fields in the property.

To recalculate the field value dynamically is necessary to do the following:

• Create an action, which defines a JavaScript code that recalculates the filed value
• Specify that the created action should be used during recalculation of the field value
• Add the field into the list of fields selected for recalculation

Here are examples, which demonstrate how to create buttons with actions:

• Add button, which calculates form field values, to the PDF interactive form
• Add a button, which sends form data to the specified URL, to the PDF interactive form
• Add button, which imports form data from specified file, to the PDF interactive form