PREV-SIBLING attribute
The previous entry in the list of handles, relative to a given handle.
Note:
Returns the Unknown value (?) for a Web service procedure.
Data type:
HANDLE
Access:
Readable
Applies to:
Asynchronous request object handle, BROWSE widget, BUTTON widget, COMBO-BOX widget, CONTROL-FRAME widget, DIALOG-BOX widget, EDITOR widget, FIELD-GROUP widget, FILL-IN widget, FRAME widget, IMAGE widget, LITERAL widget, MENU-ITEM widget, Procedure object handle, RADIO-SET widget, RECTANGLE widget, SELECTION-LIST widget, Server object handle, SLIDER widget, Socket object handle, Server socket object handle, SUB-MENU widget, TEXT widget, TOGGLE-BOX widget, WINDOW widget
Table 93 summarizes the value of PREV-SIBLING for each relevant handle type.
Table 93: PREV-SIBLING attribute values by handle type
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Asynchronous Request
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The handle of the previous asynchronous request submitted for execution on the AppServer or Web Server that is running the specified request.
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Procedure
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The handle of the previous persistent procedure in the current ABL session. If the current procedure is a proxy for a persistent procedure running on an AppServer or for a Web service, specifies the previous procedure object bound to the same server handle.
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Server
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The previous server handle created in the current ABL session (independent of subtype).
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Socket and Server-socket
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The previous socket handle in the chain of socket handles for the current ABL session. Returns the Unknown value (?) for the first handle in the chain.
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Widget
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The handle of the previous widget in the widget list.
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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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.
See also:
NEXT-SIBLING attribute
