getIsPartyList (Client API reference)
Returns a Boolean value indicating whether the lookup represents a partylist lookup. Partylist lookups allow for multiple records to be set, such as the To: column for an email table record.
Column types supported
Lookup
Syntax
formContext.getAttribute(arg).getIsPartyList()
Return Value
Type: Boolean.
Description: True if the lookup column is a partylist, otherwise false.