Using ALV Grid for data Input

Question

Hi experts.
Can someone assist me with information on using ALV grid for data input. Please give a simple example if possible.
I am mainly interested in the part in which we can transfer data from the grid changing the internal table's data.

Answer 1

Try this code:
REPORT z_demo_alv_jg.
TYPE-POOLS                                                          *
TYPE-POOLS: slis.
INTERNAL TABLES/WORK AREAS/VARIABLES                                *
DATA: i_fieldcat TYPE slis_t_fieldcat_alv,
      i_index TYPE STANDARD TABLE OF i WITH HEADER LINE,
      w_field TYPE slis_fieldcat_alv,
      p_table LIKE dd02l-tabname,
      dy_table TYPE REF TO data,
      dy_tab TYPE REF TO data,
      dy_line TYPE REF TO data.
FIELD-SYMBOLS                                                       *
FIELD-SYMBOLS: <dyn_table> TYPE STANDARD TABLE,
               <dyn_wa> TYPE ANY,
               <dyn_field> TYPE ANY,
               <dyn_tab_temp> TYPE STANDARD TABLE.
SELECTION SCREEN                                                    *
PARAMETERS: tabname(30) TYPE c,
            lines(5)  TYPE n.
START-OF-SELECTION                                                  *
START-OF-SELECTION.
Storing table name
  p_table = tabname.
Create internal table dynamically with the stucture of table name
entered in the selection screen
  CREATE DATA dy_table TYPE STANDARD TABLE OF (p_table).
  ASSIGN dy_table->* TO <dyn_table>.
  IF sy-subrc <> 0.
    MESSAGE i000(z_zzz_ca_messages) WITH ' No table found'.
    LEAVE TO LIST-PROCESSING.
  ENDIF.
Create workarea for the table
  CREATE DATA dy_line LIKE LINE OF <dyn_table>.
  ASSIGN dy_line->* TO <dyn_wa>.
Create another temp. table
  CREATE DATA dy_tab TYPE STANDARD TABLE OF (p_table).
  ASSIGN dy_tab->* TO <dyn_tab_temp>.
  SORT i_fieldcat BY col_pos.
Select data from table
  SELECT * FROM (p_table)
  INTO TABLE <dyn_table>
  UP TO lines ROWS.
  REFRESH <dyn_tab_temp>.
Display report
  CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
    EXPORTING
      i_callback_program       = sy-repid
      i_structure_name         = p_table
      i_callback_user_command  = 'USER_COMMAND'
      i_callback_pf_status_set = 'SET_PF_STATUS'
    TABLES
      t_outtab                 = <dyn_table>
    EXCEPTIONS
      program_error            = 1
      OTHERS                   = 2.
  IF sy-subrc <> 0.
  ENDIF.
*&      Form  SET_PF_STATUS
      Setting custom PF-Status
     -->RT_EXTAB   Excluding table
FORM set_pf_status USING rt_extab TYPE slis_t_extab.
  SET PF-STATUS 'Z_STANDARD'.
ENDFORM.                    "SET_PF_STATUS
*&      Form  user_command
      Handling custom function codes
     -->R_UCOMM      Function code value
     -->RS_SELFIELD  Info. of cursor position in ALV
FORM user_command  USING    r_ucomm LIKE sy-ucomm
                           rs_selfield TYPE slis_selfield.
Local data declaration
  DATA: li_tab TYPE REF TO data,
        l_line TYPE REF TO data.
Local field-symbols
  FIELD-SYMBOLS:<l_tab> TYPE table,
                <l_wa>  TYPE ANY.
Create table
  CREATE DATA li_tab TYPE STANDARD TABLE OF (p_table).
  ASSIGN li_tab->* TO <l_tab>.
Create workarea
  CREATE DATA l_line LIKE LINE OF <l_tab>.
  ASSIGN l_line->* TO <l_wa>.
  CASE r_ucomm.
  When a record is selected
    WHEN '&IC1'.
    Read the selected record
      READ TABLE <dyn_table> ASSIGNING <dyn_wa> INDEX
      rs_selfield-tabindex.
      IF sy-subrc = 0.
      Store the record in an internal table
        APPEND <dyn_wa> TO <l_tab>.
      Fetch the field catalog info
        CALL FUNCTION 'REUSE_ALV_FIELDCATALOG_MERGE'
          EXPORTING
            i_program_name         = 'Z_DEMO_PDF_JG'
            i_structure_name       = p_table
          CHANGING
            ct_fieldcat            = i_fieldcat
          EXCEPTIONS
            inconsistent_interface = 1
            program_error          = 2
            OTHERS                 = 3.
        IF sy-subrc = 0.
        Make all the fields input enabled except key fields*
          w_field-input = 'X'.
          MODIFY i_fieldcat FROM w_field TRANSPORTING input
          WHERE key IS INITIAL.
        ENDIF.
      Display the record for editing purpose
        CALL FUNCTION 'REUSE_ALV_LIST_DISPLAY'
          EXPORTING
            i_callback_program    = sy-repid
            i_structure_name      = p_table
            it_fieldcat           = i_fieldcat
            i_screen_start_column = 10
            i_screen_start_line   = 15
            i_screen_end_column   = 200
            i_screen_end_line     = 20
          TABLES
            t_outtab              = <l_tab>
          EXCEPTIONS
            program_error         = 1
            OTHERS                = 2.
        IF sy-subrc = 0.
        Read the modified data
          READ TABLE <l_tab> INDEX 1 INTO <l_wa>.
        If the record is changed then track its index no.
        and populate it in an internal table for future
        action
          IF sy-subrc = 0 AND <dyn_wa> <> <l_wa>.
            <dyn_wa> = <l_wa>.
            i_index = rs_selfield-tabindex.
            APPEND i_index.
          ENDIF.
        ENDIF.
      ENDIF.
  When save button is pressed
    WHEN 'SAVE'.
    Sort the index table
      SORT i_index.
    Delete all duplicate records
      DELETE ADJACENT DUPLICATES FROM i_index.
      LOOP AT i_index.
      Find out the changes in the internal table
      and populate these changes in another internal table
        READ TABLE <dyn_table> ASSIGNING <dyn_wa> INDEX i_index.
        IF sy-subrc = 0.
          APPEND <dyn_wa> TO <dyn_tab_temp>.
        ENDIF.
      ENDLOOP.
    Lock the table
      CALL FUNCTION 'ENQUEUE_E_TABLE'
        EXPORTING
          mode_rstable   = 'E'
          tabname        = p_table
        EXCEPTIONS
          foreign_lock   = 1
          system_failure = 2
          OTHERS         = 3.
      IF sy-subrc = 0.
      Modify the database table with these changes
        MODIFY (p_table) FROM TABLE <dyn_tab_temp>.
        REFRESH <dyn_tab_temp>.
      Unlock the table
        CALL FUNCTION 'DEQUEUE_E_TABLE'
          EXPORTING
            mode_rstable = 'E'
            tabname      = p_table.
      ENDIF.
  ENDCASE.
  rs_selfield-refresh = 'X'.
ENDFORM.                    "user_command