Do not generate any input element, just accept a value.
getDiv( $value)
Get the complete div for the input, including help text, labels, and whatever.
hasVisibleOutput()
If this field has a user-visible output or not.
getTableRow( $value)
Get the complete table row for the input, including help text, labels, and whatever.
canDisplayErrors()
True if this field type is able to display errors; false if validation errors need to be displayed in...
getRaw( $value)
Get the complete raw fields for the input, including help text, labels, and whatever.
getInputHTML( $value)
This function must be implemented to return the HTML to generate the input object itself.