List item position

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4D v16.3

List item position


List item position ( {* ;} list ; itemRef ) -> Function result

Parameter	Type	Description
*	Operator	If specified, list is an object name (string) If omitted, list is a list reference number
list	ListRef, String	List reference number (if * omitted), or Name of list type object (if * passed)
itemRef	Longint	Item reference number
Function result	Longint	Item position in expanded/collapsed lists

Description

The List item position command returns the position of the item whose item reference number is passed in itemRef, within the list whose list reference number or object name is passed in list.

If you pass the first optional * parameter, you indicate that the list parameter is an object name (string) corresponding to a representation of the list in the form. If you do not pass this parameter, you indicate that the list parameter is a hierarchical list reference (ListRef). If you only use a single representation of the list, you can use either syntax. Conversely, if you use several representations of the same list, the syntax based on the object name is required since each representation can have its own expanded/collapsed configuration.

Note: If you use the @ character in the object name of the list and the form contains several lists matching this name, the List item position command will be applied to the first object whose name corresponds.

Note: Unlike the other commands of this theme, with this command it is not possible to pass the value 0 in itemRef to designate the last item added.

The position is expressed relative to the top item of the main list, using the current expanded/collapsed state of the list and its sublist.

The result is therefore a number between 1 and the value returned by Count list items.

If the item is not visible because it is located in a collapsed list, List item position expands the appropriate list to make the item visible.

If the item does not exist, List item position returns 0.