ABAP Tutorial

7 ABAP List Views

We are

1. create a table we want to output
2. create an object variable of type cl_salv_table
3. beautifying our (ALV) with optimized column width, list headers, striped patterns, etc.
4. let the user sort and filter our ALV

a Capture input parameter and create an output table

First we create a SELECTION-SCREEN to input a parameter:

1   REPORT zco2_01_connections .
2   SELECTION−SCREEN BEGIN OF BLOCK a1 WITH FRAME TITLE TEXT−f01.
3   " Uberschrift   ist im   Textfeld   f01   hinterlegt .
4   PARAMETERS: p_carr TYPE sflight − carrid .
5   SELECTION−SCREEN END OF BLOCK a1.

The input SELECTION-SCREEN looks as follows:

Then we create the table lt_ausgabe which we want to output.

1    SELECT ∗
2    FROM zco2_01_connection_co2
3    WHERE Anbieter = @p_carr
4    INTO TABLE @DATA(lt_ausgabe).
5
6    IF lt_ausgabe   IS INITIAL .
7    Message i001 (ZCO2N01).
8    ELSE.
9    \ subsection { Create   object   of type \ verb | cl_salv_table |}
10
11

b Creating a clsalvtable object

Now we create an object variable of type cl_salv_table.

1   ∗    ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
2   ∗ALV GRID erzeugen
3   ∗    ∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗∗
4
5   DATA: lo_salv      TYPE REF TO cl_salv_table .
6   ∗ Create the ALV object

On this lo_salv object we can operate all the

c Our very simple ALV grid

We needed to TRY because we need to catch the exception cx_salv_msg.

1   TRY.
2    cl_salv_table => factory (
3   IMPORTING
4    r_salv_table   = lo_salv
5   CHANGING
6   t_table         = lt_ausgabe     ).

We have created the object, however, we still need to output it withÂĺ

1   lo_salv −> display ( ) .

When copying all the code snippets, do not forget to delete the previous lo_salvâĘŠdisplay ( ) since we insert it at the very end.

The table we output is on line 7 ltausgabe.

d Beautifying our ABAP List View (ALV)

Now we beautify our table.

1. We optimize the column width in line 2
2. we set a list header (line 3)
3. we stripe the results for better legibility (line 4)
4. TBD

1     ∗ Basic     Settings
2     lo_salv −> get_columns ( )−> set_optimize ( abap_true ) .
3     lo_salv −> get_display_settings     ( )−> set_list_header ( ' CO2 Verbrauch ' ) .
4     lo_salv −> get_display_settings     ( )−> set_striped_pattern ( abap_true ) .
5     lo_salv −> get_selections ( )−> set_selection_mode (             if_salv_c_selection_mode =>row_column ) .
6
7     "Column headings :     technical   Name und    description
8     LOOP AT lo_salv−> get_columns ( )−> get ( ) ASSIGNING FIELD−SYMBOL(<c>).
9     DATA(o_col) = < c > −r_column.
10     " Set Short Text to empty , so that      autosize       works for    columns
11     o_col −> set_short_text ( || ) .
12     " Set medium Text to empty , so that         autosize    works for    columns
13     o_col −> set_medium_text ( || ) .
14    DATA(lv_columnname)         = o_col −> get_columnname ( ) .
15    TRANSLATE lv_columnname TO LOWER CASE.
16    TRANSLATE lv_columnname(1) TO UPPER CASE.
17     o_col −> set_long_text ( |{ lv_columnname }| ) .
18    ENDLOOP.

This is how everything looks like

If you look closely, above the results we have icons, allowing us to

1. select all
2. deselect all
3. sort ascending
4. sort descending
5. filter

our results.

e Filter and Sorting the ALV

Here we implement the feature to filter and sort the results.

1   lo_salv −> get_functions (   )−> set_filter (     ) .
2   lo_salv −> get_functions (   )−> set_sort_asc (     ).
3   lo_salv −> get_functions (   )−> set_sort_desc (        ).
4   lo_salv −> display ( ) .

Just to be complete, we need close our TRY and ENDIF.

1   CATCH cx_salv_msg.
2   ENDTRY.
3   ENDIF.

f Naming the headers of ALV grids and descriptions of selection parameters

How to get the header ALVheader and the parameter Lagernummer (instead of the uglily named p_lagnum) into our ALV Grid.

In transaction SE38 click GOTO->Text Element.

The Text element Screen opens and you can edit the Selection Texts and List Headings (highlighted in yellow).