Form fields API (with all available types). All classes are based on Immutable.Record. Classes ButtonFormField A clickable button. CheckBoxFormField A check box or a group of many check boxes. ChoiceFormField Base form field for all fields allowing multiple choices. ComboBoxFormField A drop down box with the option to add custom entries. FormField Base form field type from which all form fields inherit. ListBoxFormField A list box where multiple values can be selected. RadioButtonFormField A group of radio buttons. SignatureFormField A filed that contains a ink signature. TextFormField A text input element, that can either span a single or multiple lines.