DropDownByKey 

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 item already selected is displayed in the text field. When the user chooses the pushbutton, a list of all possible values is displayed.

If you want to create a DropDown list in which some entries are available in multiple, use DropDownByKey.

To enable the development of accessible applications the label property is checked during the syntax check.

If no label has been set, and no descriptive text has been specified for the appropriate bound context element in the ABAP Dictionary, the tooltip property is checked.

Examples of the Display

The dropdown list box UI elements, DropDownByKey and DropDownByIndex, 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 generally, and Data Binding of UI Element Properties and Data Binding of a Dropdown Listbox. You can find more information about using dropdown listboxes with index data binding in AbstractDropDownByKey.

 

Runtime Class

CL_WD_DROPDOWN_BY_KEY

 

Properties in View Designer

Name	Type	Initial Value	Bindable
ID	STRING	(automatic)	no
enabled	WDY_BOOLEAN	true	yes
explanation	Translatable text		no
keyVisible	WDY_BOOLEAN	false	yes
labelFor	STRING		no
readOnly	WDY_BOOLEAN	false	yes
selectedKey	STRING		Mandatory
state	WDUI_STATE	normal	yes
textDirection	WDUI_TEXT_DIRECTION	inherit	yes
tooltip	Translatable text		yes
visible	WDUI_VISIBILITY	visible	yes
width	STRING		yes

 

Events in View Designer

Name

onSelect

Other properties that can be inherited are defined in the associated higher-level classes. The associated UI elements are:

 

●        AbstractDropDownByKey

●        AbstractDropDown

●        UIElement

●        ViewElement

 

Dynamic Programming

For dynamic programming, the same properties, events and aggregations are available as in the View Designer. Bear in mind the different spellings.

Note that when you program value lists dynamically in context (NODE_INFO->SET_ATTROBUTE_VALUE_SET() ), that you have to insert a CONDENSE if you use integer types for an attribute.

Dynamic Programming of Properties

View Designer Name	Runtime Name	Type
enabled	ENABLED	WDY_BOOLEAN
explanation	EXPLANATION	WDY_MD_TRANSLATABLE_TEXT
keyVisible	KEY_VISIBLE	WDY_BOOLEAN
labelFor	LABEL_FOR	STRING
readOnly	READ_ONLY	WDY_BOOLEAN
selectedKey	SELECTED_KEY	STRING
state	STATE	WDUI_STATE
state: normal	CL_WD_DROPDOWN_BY_KEY=>E_STATE-NORMAL
state: required	CL_WD_DROPDOWN_BY_KEY=>E_STATE-REQUIRED
textDirection	TEXT_DIRECTION	WDUI_TEXT_DIRECTION
textDirection inherit	CL_WD_DROPDOWN_BY_KEY=>E_TEXT_DIRECTION-INHERIT
textDirection ltr	CL_WD_DROPDOWN_BY_KEY=>E_TEXT_DIRECTION-LTR
textDirection rtl	CL_WD_DROPDOWN_BY_KEY=>E_TEXT_DIRECTION-RTL
tooltip	TOOLTIP	WDY_MD_TRANSLATABLE_TEXT
visible	VISIBLE	WDUI_VISIBILITY
visible: none	CL_WD_DROPDOWN_BY_KEY=>E_VISIBLE-NONE
visible: visible	CL_WD_DROPDOWN_BY_KEY=>E_VISIBLE-VISIBLE
width	WIDTH	STRING

 

Dynamic Programming of Events

View Designer Name	Runtime Name
onSelect	ON_SELECT

Example

There is a system example for this UI element in the DEMO_UIEL_STD_SELECTION component in the DEMO_UIEL_DROPDOWN_BY_KEY application.