LOOP AT SCREEN [INTO wa].
...
ENDLOOP.
The statements LOOP AT SCREEN ... ENDLOOP define a loop around a statement block. For every screen element of the current dynpro, to which a dynpro field is assigned, one loop pass is executed. After the LOOP statement either the predefined workarea screen or the workarea wa (when using INTO) contains the properties of the respective screen element. wa must have the same data type as screen.
While processing a table control or a step loop (that is, within a LOOP loop of the dynpro flow logic), for its screen elements the current properties are determined in the current row or group. Outside of the processing of a table control or step loop, for its screen elements the statically predefined properties of all rows or groups are determined.
The table below shows the components of screen and their assignment to the field properties in the dynpro.
| Component | Length | Type | Attribute | Description |
| name | 132 | c | Name | Name |
| group1 | 3 | c | Group1 | Modification group |
| group2 | 3 | c | Group2 | Modification group |
| group3 | 3 | c | Group3 | Modification group |
| group4 | 3 | c | Group4 | Modification group |
| required | 1 | c | Required-entry field | Mandatory field |
| input | 1 | c | Input | input-enabled field |
| output | 1 | c | Output | display field |
| intensified | 1 | c | Intensified | intensified field |
| invisible | 1 | c | Invisible | invisible element |
| length | 1 | x | visLength | Field length |
| active | 1 | c | Input/Output/Invisible | active field |
| display_3d | 1 | c | Two-dimensional | Box |
| value_help | 1 | c | Input help | Input help key |
| request | 1 | c | - | Input exists |
| values_in_combo | 1 | c | Dropdown listbox | Value help exists |
The component name in the loop contains the name of the current dynpro field. The components group1 to group4 can contain three-character IDs, which were assigned to the current screen element in its definition. These IDs allow you to combine the screen elements in up to four different modification groups. In the statement block after LOOP AT SCREEN, these can be queried in logical expressions in order to process several elements in the same way.
The other components of table screen represent the display properties of the current screen element. With the exception of length, they can contain 0 or 1, where 1 is "active" and 0 is "inactive".
Except active, all components of structure
screen directly correspond to one attribute of the current screen element. The component
active has no match in the attributes. If you change its
content with MODIFY SCREEN,
this affects the attributes Input, Output
and Invisible and thus the components
input, output and invisible of structure screen.