In ALV display model ,how to accept the ENTER key event?

Question

Dear All,
I have used ALV by  GRID DISPLAY model ,not class model.
    CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
      i_callback_program       = sy-repid
      i_callback_pf_status_set = 'SET_PF_STATUS'
      i_callback_user_command  = 'USER_COMMAND'
      i_structure_name         = 'T_ITAB'
      is_layout                = gs_layout
      it_fieldcat              = t_fieldcat[]
      i_default                = 'X'
      i_save                   = 'A'
    TABLES
      t_outtab                 = t_itab
    EXCEPTIONS
      program_error            = 1
      OTHERS                   = 2.
For example :
IN ALV DISPLAY, there are two fields, one is MATNR, the other is MAKTX.
When user input the material value in MATNR field and press ENTER, then ALV can run my code to select the MAKTX into MAKTX field and display it synchronization.
Now I have realized update edit in ALV,but I found only I double click ALV row, then the MAKTX can update.
Please give me help,
Thanks
Sun

Answer 1

This is the document written by me on Interactive ALV.. hope this maybe helpful for u..
When an Interactive Report is needed in Classical Display, we go for AT LINE-SELECTION. But when the same is needed in ALV Display, this method won't work. Instead, we need to use other way which is explained below:
We use REUSE_ALV_GRID_DISPLAY for ALV Display. Now, normally we call that FM in the following way:
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
       EXPORTING
            i_callback_program      = 'PROGRAM_NAME'
            it_fieldcat             = tb_fieldcat
       TABLES
            t_outtab                = tb_output.
When it is needed to get an Interactive ALV, call the same FM in the following manner:
  CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
       EXPORTING
            i_callback_program      = 'ZTEST75599_1'
            it_fieldcat             = tb_fieldcat
            i_callback_user_command = 'USER_COMMAND'
       TABLES
            t_outtab                = tb_output.
Now, in the report, create a subroutine with the name USER_COMMAND as follows:
FORM user_command  USING p_ucomm    LIKE sy-ucomm
                         p_selfield TYPE slis_selfield.
  CASE p_ucomm.
    WHEN '&IC1'.   " &IC1 - SAP standard code for double-clicking
Based on the requirement, write the logic                          *
  ENDCASE.
ENDFORM.
No need to call the subroutine as PERFORM user_command. This will be takane care by REUSE_ALV_GRID_DISPLAY. We need to just write the subroutine in the report. That suffices.
Some more useful points for Interactive ALV:
1. If Hotspot is needed, then that should be done by declaring hotspot (one field in slis_t_fieldcat_alv) as 'X' in tb_fieldcat which is of type slis_t_fieldcat_alv. When hotspot is active, single click will be enough or else you should double click on the output data.
2. In Classical Display, when it is needed to read the record on which we double clicked, we do that in following way:
   AT LINE-SELECTION.
       GET CURSOR LINE wf_line. " wf_line gives the line number on which it has been clicked
         READ LINE wf_line OF CURRENT PAGE.
  But this won't work for ALV. Instead, the following logic can be used:
FORM user_command  USING p_ucomm    LIKE sy-ucomm
                         p_selfield TYPE slis_selfield.
  CASE p_ucomm.
    WHEN '&IC1'.   " &IC1 - SAP standard code for double-clicking
      READ TABLE tb_output INTO wa_output INDEX p_selfield-tabindex.
      IF sy-subrc EQ 0.
Based on the requirement, write the logic                          *
      ENDIF.
  ENDCASE.
ENDFORM.