4D Doc Center : GET LIST ITEM

4D v13.4

GET LIST ITEM


GET LIST ITEM ( {* ;} list ; itemPos \| * ; itemRef ; itemText {; sublist ; expanded} )

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)
itemPos \| *	Operator, Longint	Position of item in expanded/collapsed list(s) or * for the current item in the list
itemRef	Longint	Item reference number
itemText	String	Text of the list item
sublist	ListRef	Sublist list reference number (if any)
expanded	Boolean	If a sublist is attached: TRUE = sublist is currently expanded FALSE = sublist is currently collapsed

Description

The GET LIST ITEM command returns information about the item specified by itemPos of the list whose 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 and its own current item.

Note: If you use the @ character in the name of the list object and the form contains several lists that match with this name, the GET LIST ITEM command will only apply to the first object whose name corresponds.

The position must be expressed relatively, using the current expanded/collapsed state of the list and its sublist. You pass a position value between 1 and the value returned by Count list items. If you pass a value outside this range, GET LIST ITEM returns empty values (0, "", etc.).

After the call, you retrieve:

The item reference number of the item in itemRef.
The text of the item in itemText.

If you passed the optional parameters sublist and expanded:

subList returns the list reference number of the sublist attached to the item. If the item has no sublist, subList returns zero (0).
If the item has a sublist, expanded returns TRUE if the sublist is currently expanded, and FALSE if it is collapsed.

Example 1

hList is a list whose items have unique reference numbers. The following code programmatically toggles the expanded/collapsed state of the sublist, if any, attached to the current selected item:

 $vlItemPos:=Selected list items(hList)

 If($vlItemPos>0)

    GET LIST ITEM(hList;$vlItemPos;$vlItemRef;$vsItemText;$hSublist;$vbExpanded)

    If(Is a list($hSublist))

       SET LIST ITEM(hList;$vlItemRef;$vsItemText;$vlItemRef;$hSublist;Not($vbExpanded))

    End if

 End if

Example 2

Refer to the example of the APPEND TO LIST command.