Example ALV in abap SAP

&---------------------------------------------------------------------*
*& Report Z_SCREEN_DEMO
*&
*&---------------------------------------------------------------------*
*&
*&
*&---------------------------------------------------------------------*

REPORT Z_SCREEN_DEMO.


*&---------------------------------------------------------------------*
* Declare global object and selection screen.
*&---------------------------------------------------------------------*
*-----------------------------------------------------------------------
* TYPE POOL
*-----------------------------------------------------------------------
TYPE-POOLS:
SLIS.
*----------------------------------------------------------------------*
* TABLES
*----------------------------------------------------------------------*
TABLES:MARA.
*----------------------------------------------------------------------*
* TYPES
*----------------------------------------------------------------------*
*Struct MARA
TYPES: BEGIN OF GTY_MARA,
MATNR TYPE MARA-MATNR,"MATERIAL NUMBER
MTART TYPE MARA-MTART,
END OF GTY_MARA.
*Struct MAKT
TYPES: BEGIN OF GTY_MAKT,
MATNR TYPE MAKT-MATNR,"MATERIAL NUMBER
MAKTX TYPE MAKT-MAKTX,
END OF GTY_MAKT.
*Struct OUTPUT
TYPES: BEGIN OF GTY_OUTPUT,
MATNR TYPE MARA-MATNR,"MATERIAL NUMBER
MTART TYPE MARA-MTART,"MATERIAL TYPE
MAKTX TYPE MAKT-MAKTX,"MATERIAL DES
END OF GTY_OUTPUT.
*----------------------------------------------------------------------*
* Internal table
*----------------------------------------------------------------------*
DATA: GT_OUTPUT TYPE STANDARD TABLE OF GTY_OUTPUT,
GT_MARA TYPE STANDARD TABLE OF GTY_MARA,
GT_MAKT TYPE STANDARD TABLE OF GTY_MAKT,
*----------------------------------------------------------------------*
* Work area
*----------------------------------------------------------------------*
GS_OUTPUT TYPE GTY_OUTPUT,
GS_MARA TYPE GTY_MARA,
GS_MAKT TYPE GTY_MAKT.
*----------------------------------------------------------------------*
* Selection screen
*----------------------------------------------------------------------*
SELECT-OPTIONS: S_ERDA FOR MARA-ERSDA default '20110916 ' OBLIGATORY.
PARAMETERS:
pa_lim_1 RADIOBUTTON GROUP lim ,"JOIN
pa_lim_2 RADIOBUTTON GROUP lim,"FOR ALL ENTRIES
*----------------------------------------------------------------------*
* INITIALIZATION.
*----------------------------------------------------------------------*
INITIALIZATION.
*----------------------------------------------------------------------*
* AT SELECTION-SCREEN
*----------------------------------------------------------------------*
AT SELECTION-SCREEN.
*----------------------------------------------------------------------*
* START-OF-SELECTION
*----------------------------------------------------------------------*
START-OF-SELECTION.
*Select data
IF PA_LIM_1 IS NOT INITIAL.
*Join
SELECT
M~MATNR
M~MTART
M2~MAKTX
INTO TABLE GT_OUTPUT
FROM
MARA AS M
JOIN MAKT AS M2 ON M~MATNR = M2~MATNR
WHERE M~ERSDA IN S_ERDA AND
M2~SPRAS = 'E'.
ELSE.
*For all entries
SELECT
MATNR
MTART
FROM MARA
INTO TABLE GT_MARA
WHERE ERSDA IN S_ERDA.
DELETE ADJACENT DUPLICATES FROM GT_MARA COMPARING MATNR.
IF GT_MARA IS NOT INITIAL.
SELECT
MATNR
MAKTX
FROM MAKT
INTO TABLE GT_MAKT
FOR ALL ENTRIES IN GT_MARA
WHERE MATNR = GT_MARA-MATNR AND SPRAS = 'E'.
ENDIF.
SORT GT_MAKT BY MATNR.
LOOP AT GT_MARA INTO GS_MARA.
CLEAR: GS_MAKT.
READ TABLE GT_MAKT BINARY SEARCH WITH KEY MATNR = GS_MARA-MATNR
INTO GS_MAKT.
GS_OUTPUT-MATNR = GS_MARA-MATNR.
GS_OUTPUT-MTART = GS_MARA-MTART.
GS_OUTPUT-MAKTX = GS_MAKT-MAKTX.
APPEND GS_OUTPUT TO GT_OUTPUT.
ENDLOOP.
ENDIF.
*----------------------------------------------------------------------*
* End-OF-SELECTION
*----------------------------------------------------------------------*
END-OF-SELECTION.
* Output data
* ALV
data: LS_FIELDCAT type slis_fieldcat_alv.
data: GT_FIELDCAT type slis_t_fieldcat_alv.
PERFORM CREATE_FIELD_CAT.
*&---------------------------------------------------------------------*
*& Form CREATE_FIELD_CAT
*&---------------------------------------------------------------------*
* Create field catalogies
*----------------------------------------------------------------------*
FORM CREATE_FIELD_CAT .
call function 'REUSE_ALV_FIELDCATALOG_MERGE'
exporting
i_internal_tabname = 'GT_OUTPUT'
i_structure_name = 'ZOUTPUT'
changing
ct_fieldcat = GT_FIELDCAT.
ENDFORM. " CREATE_FIELD_CAT
*&---------------------------------------------------------------------*
*& Form GRID_DISPLAY
*&---------------------------------------------------------------------*
* Grid Display
*----------------------------------------------------------------------*
FORM GRID_DISPLAY .
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
EXPORTING
I_CALLBACK_PROGRAM = 'ZSCREEN_DEMO1'
* I_CALLBACK_USER_COMMAND = 'USER_COMMAND'
I_CALLBACK_TOP_OF_PAGE = 'FRM_TOP_OF_PAGE'
IT_FIELDCAT = GT_FIELDCAT
I_SAVE = 'X'
* IS_VARIANT = G_VARIANT
TABLES
T_OUTTAB = GT_OUTPUT
EXCEPTIONS
PROGRAM_ERROR = 1
OTHERS = 2.
IF SY-SUBRC <> 0.
* MESSAGE ID SY-MSGID TYPE SY-MSGTY NUMBER SY-MSGNO
* WITH SY-MSGV1 SY-MSGV2 SY-MSGV3 SY-MSGV4.
ENDIF.
ENDFORM. " GRID_DISPLAY
*&---------------------------------------------------------------------*
*& Form Top of page
*&---------------------------------------------------------------------*
* Top of page
*----------------------------------------------------------------------*
FORM FRM_TOP_OF_PAGE.
*ALV Header declarations
DATA: T_HEADER TYPE SLIS_T_LISTHEADER,
WA_HEADER TYPE SLIS_LISTHEADER.
* Title
WA_HEADER-TYP = 'H'.
WA_HEADER-INFO = 'ALV Demo'.
APPEND WA_HEADER TO T_HEADER.
CLEAR WA_HEADER.
* Date
WA_HEADER-TYP = 'S'.
WA_HEADER-KEY = 'Date: '.
CONCATENATE SY-DATUM+6(2) '.'
SY-DATUM+4(2) '.'
SY-DATUM(4) INTO WA_HEADER-INFO. "todays date
APPEND WA_HEADER TO T_HEADER.
CLEAR: WA_HEADER.
CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
EXPORTING
IT_LIST_COMMENTARY = T_HEADER.
ENDFORM.

*Output Result: