THotPDF.SetFormFieldAdditionalAction Method

Installs an AcroForm field additional action from a THPDFActionBuilder under the field widget /AA dictionary

Declaration

procedure SetFormFieldAdditionalAction(const FieldName: AnsiString; Trigger: THPDFFormFieldActionTrigger; Action: THPDFActionBuilder);

HPDFDoc

Name	Purpose
`FieldName`	Existing AcroForm field name to find in the generated field list
`Trigger`	Field additional-action trigger: KeyStroke, Format, Validate, or Calculate
`Action`	Action chain built with `THPDFActionBuilder`

Call this method after creating the target field and before EndDoc
The method replaces any existing action for the same trigger key and keeps other /AA entries unchanged
Use ClearFormFieldAdditionalAction to remove one field trigger entry without disturbing other field actions
Use the named helpers in THotPDFFormFieldActionConvenienceMethods when code should call one method per field or widget trigger
Builder validation enforces PDF/A and PDF/X restrictions for action types that are not allowed in those conformance families
Use AttachFieldKeyStrokeAction, AttachFieldFormatAction, AttachFieldValidateAction, or AttachFieldCalculateAction for the JavaScript-only convenience path