Returns a BOOLEAN value that indicates whether the object ID is available.
FUNCTION ID_NULL
(Alert ALERT);
FUNCTION ID_NULL
(Block BLOCK);
FUNCTION ID_NULL
(Canvas CANVAS);
FUNCTION ID_NULL
(Editor EDITOR);
FUNCTION ID_NULL
(FormModule FORMMODULE);
FUNCTION ID_NULL
(GroupColumn GROUPCOLUMN);
FUNCTION ID_NULL
(Item ITEM);
FUNCTION ID_NULL
(LOV LOV);
FUNCTION ID_NULL
(MenuItem MENUITEM);
FUNCTION ID_NULL
(ParamList PARAMLIST);
FUNCTION ID_NULL
(RecordGroup RECORDGROUP);
FUNCTION ID_NULL
(Relation RELATION);
FUNCTION ID_NULL
(Report_Object REPORT_OBJECT);
FUNCTION ID_NULL
(TabPage TABPAGE);
FUNCTION ID_NULL
(Timer TIMER);
FUNCTION ID_NULL
(Viewport VIEWPORT);
FUNCTION ID_NULL
(VisualAttribute VISUALATTRIBUTE);
FUNCTION ID_NULL
(Window WINDOW);
Built-in Type unrestricted function
Returns BOOLEAN
Enter Query Mode yes
object_id You can call this function to test results of the following object ID types:
Use ID_NULL when you want to check for the existence of an object created dynamically at runtime. For example, if a specific record group already exists, you will receive an error message if you try to create that record group. To perform this check, follow this general process:
If you are going to test for an object’s existence at various times (that is, more than once during a run), then you need to reissue the appropriate FIND_ every time -- once preceding each use of ID_NULL.
See CREATE_GROUP Built-in.