Progress
Language Reference


PREV-SIBLING Attribute

The previous entry in the list of persistent procedure handles, server handles, or widget handles, relative to a given handle.

Data Type: Handle

Access: Readable

Applies To: Asynchronous Request Object Handle, Browse, Button, Combo-box, Control-frame, Dialog-box, Editor, Field-group, Fill-in, Frame, Image, Literal, Menu-item, Radio-set, Rectangle, Selection-list, Server Object Handle, Slider, Socket Object Handle, Server-socket Object Handle, Sub-menu, Text, THIS-PROCEDURE System Handle (and all procedure handles), Toggle-box, Window

Table 59 summarizes the value of PREV-SIBLING for each relevant handle type.

Table 59: PREV-SIBLING Attribute 
Handle Type
Value of NEXT-SIBLING
Asynchronous Request
The handle of the previous asynchronous request submitted for execution on the AppServer that is running the specified request.
Procedure
The handle of the previous persistent procedure in the current Progress session
Server
The previous server handle created in the current Progress session
Socket and Server-socket
The previous socket handle in the chain of socket handles for the current Progress session. Returns the unknown value (?) for the first handle in the chain.
Widget
The handle of the previous widget in the widget list

If the given handle is the first handle in the list, PREV SIBLING assumes the value of an invalid handle. To check the validity of a handle, use the VALID-HANDLE function.

NOTE: A widget must first be realized before it can become part of the list. A hidden widget cannot become part of the list since it is not realized. A widget that is already part of the list can be hidden and it remains part of the list.


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