When this variable is set to a non-empty value, the eval function is used when displaying the option list for the field. This variable allows the standard implementation of option lists (defined by the defaultOptionListScript variable) to be overridden.
Returns TRUE if the value is nonempty.
Returns FALSE if the value is an empty string.
Defines a custom script for creation of an option list:
<$customOptionListScript = getValue("#active", fieldName & ":optionListScript")$>