| Interface | Description | 
|---|---|
| FieldGenDatatypeHandler<DT extends CustomDatatype<T>,T> | 
 A web-layer extension of a  
CustomDatatypeHandler, which also defines what fieldgen widget is used to
 collect the values, and how to fetch them from a web request. | 
| HtmlDisplayableDatatypeHandler<T> | 
 A CustomDatatypeHandler that is capable of producing HTML output for display 
 | 
| WebDatatypeHandler<DT extends CustomDatatype<T>,T> | 
 A web-layer extension of  
CustomDatatypeHandler, which generates the HTML for a widget, and handles the submission of that widget | 
| Class | Description | 
|---|---|
| BooleanFieldGenDatatypeHandler | 
 Handler for the boolean custom datatype 
 | 
| DateFieldGenDatatypeHandler | 
 A fieldgen version of a  
DateAttributeHandler that uses the standard Date picker widget. | 
| LongFreeTextFileUploadHandler | 
 Handler for the  
LongFreeTextDatatype that displays as a file upload input. | 
| LongFreeTextTextareaHandler | 
 Handler for the  
LongFreeTextDatatype that displays as a textarea. | 
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