Hi,
**DropDownByKey :**
A DropDownByKey UI element provides the user with a selection list from which he or she can select no more than one entry. The UI element consists of a text field, a button, and a selection list. Any list entry already selected is displayed in the text field. When you select the pushbutton, a list with all possible values is displayed.
The dropdown list box UI elements do not differ from each other when displayed on the screen. However, the data binding model for the DropDownByKey UI element has a completely different concept. See Data Binding Within Web Dynpro and Data Binding of a Dropdown List Box and Radio Button Group).
When using a dropdown list box, always display this UI element alongside a Label UI element (that is, an element with a label) to ensure accessibility.
Description of UI Element Properties
· labelFor
The DropDownByKey element can also be used as a label for other UI elements. You can use the labelFor property to reference to a UI element.
· selectedKey
Use this property to determine the value from the value set, which is to be selected from the list of the dropdown listbox.
· size
This property is deprecated and can no longer be used.
**DropDownByIndex :**
The Web Dynpro class DropDownByIndex , which implements the IWDDropDownByIndex interface, is the base class of the dropdown list boxes for which index binding is used.
Definition
A DropDownByIndex UI element provides the user with a dropdown list box. You cannot select more than one entry from the selection list. The UI element consists of a text field, a button, and a selection list. Any list entry already selected is displayed in the text field. When selecting the button, a list with all possible values is displayed.
When using a dropdown list box, always display this UI element alongside a label to ensure accessibility.
Description of UI Element Properties
· labelFor
The DropDownByIndex element can also be used as a label for other UI elements. You can use the labelFor property to reference to a UI element.
· selectionChangeBehaviour
The change of the lead selection can cause a data loss u2013 for example, if the changed or new data was not written to the context due to syntax errors. You can avoid the data loss using the selectionChangeBehaviour property before changing the lead selection:
auto
If the data was written to the context, the value auto specifies that the ItemListBox automatically changes the lead selection of its data source directly after an interaction by the user before the corresponding event is triggered.
manual
Specifies that the ItemListBox does not change the lead selection of its data source after an interaction by the user but triggers the corresponding event. In this case, the event handler must change the lead selection to enable the ItemListBox to display the data in a main detail view, for example. This setting allows you to check the change of the lead selection.
· size
This property is deprecated and can no longer be used.
Regards,
Srinivas.
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