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Implements the event handler signalled when data in the linked dataset has been changed.
Source position: dbctrls.pp line 390
protected procedure TDBListBox.DataChange( |
Sender: TObject |
); override; |
Sender |
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Object for the event notification. |
DataChange is an overridden procedure in TDBListBox. It implements the abstract virtual method defined in the ancestor class, and updates ItemIndex to reflect the current value in the linked dataset (when available).
When DataField is an empty string, the value in ItemIndex is set to -1 to indicate that no item is selected in the control. Otherwise, the field value in the linked dataset is located in Items and its ordinal position is used in ItemIndex.
DataChange is used as the OnDataChange event handler in the TFieldDataLink instance for the control.
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The list of all items defined in the control. |
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Name for the field in the linked dataset used in the control. |
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FieldName - the name of the attached field, stored as a string. |
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The Field to which the datalink is attached. |
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Performs actions needed when the linked dataset is repositioned. |
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Ordinal position for the currently selected item, -1 if none. |
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| Version 4.0 | Generated 2025-05-03 | Home |