topic Re: Dynamic variable in class / problem with refreshing ALV in Application Development and Automation Discussions

Dynamic variable in class / problem with refreshing ALV

kroslaniec — Tue, 19 Oct 2021 08:38:59 GMT

Hi,

In my class I have 3 methods which I am using:

Prepare data method where we are selecting dynamically 1 name of the table from selection screen into string. I have global attribute TABLE_REF which is Type Ref DATA. Next steps are the only way I could think of how to get a reference to the global variable:

      CREATE DATA TABLE_REF TYPE TABLE OF   (GS_PARAMS-GV_SELECTED_TAB).
      CREATE DATA GS_PARAMS-LS_TABLE TYPE TABLE OF   (GS_PARAMS-GV_SELECTED_TAB).
      FIELD-SYMBOLS <FS_TABLE>             TYPE STANDARD TABLE.
      ASSIGN        GS_PARAMS-LS_TABLE->*   TO              <FS_TABLE>.
      ASSIGN TABLE_REF->* TO <FS_TABLE>.

Then I am selecting the data into <fs_table>, and I can refer to them in other methods by using TABLE_REF global attribute.

Create ALV method, it's a standard instance of cl_salv table, it's initialized by this code (go_alv is also a class attribute):

FIELD-SYMBOLS: <FS_TABLE> TYPE STANDARD TABLE.
      ASSIGN TABLE_REF->* TO <FS_TABLE>.

      TRY.
          CALL METHOD CL_SALV_TABLE=>FACTORY
            IMPORTING
              R_SALV_TABLE = GO_ALV
            CHANGING
              T_TABLE      = <FS_TABLE>.
        CATCH CX_SALV_MSG.
      ENDTRY.

On user command, where we have custom buttons to enter JSON (last column) of choosen row and then we can make some changes.

My problem is that whatever I am trying to do, I cannot refresh my ALV (it's r_table parameter is the same after many attempts of refreshing). I thought that I could create a new instance of go_alv and it's working, but when I am clicking the back button the old version is displayed (with old data). Any ideas what we could do there different?

Re: Dynamic variable in class / problem with refreshing ALV

Sandra_Rossi — Tue, 19 Oct 2021 09:39:31 GMT

In your code, this line is useless and can be removed safely:

ASSIGN        GS_PARAMS-LS_TABLE->*   TO              <FS_TABLE>.

You can refresh the screen with:

GO_ALV->REFRESH( ).

Re: Dynamic variable in class / problem with refreshing ALV

kroslaniec — Tue, 19 Oct 2021 10:42:30 GMT

sandra.rossi I deleted two additional lines, and the beginning of my code looks like this now:

CREATE DATA TABLE_REF TYPE TABLE OF   (GS_PARAMS-GV_SELECTED_TAB).
      FIELD-SYMBOLS <FS_TABLE>             TYPE STANDARD TABLE.
      ASSIGN TABLE_REF->* TO <FS_TABLE>.

Second thing - I will show some more code from display ALV method to clarify what's wrong:

      FIELD-SYMBOLS: <FS_TABLE> TYPE STANDARD TABLE.
      ASSIGN TABLE_REF->* TO <FS_TABLE>.

      if 1 = 2.
        go_alv->REFRESH( ).
      endif.

      TRY.
          CALL METHOD CL_SALV_TABLE=>FACTORY
            IMPORTING
              R_SALV_TABLE = GO_ALV
            CHANGING
              T_TABLE      = <fs_table>.
        CATCH CX_SALV_MSG.
      ENDTRY.

Then I am trying to call those lines after the user_command:

    GO_ALV->REFRESH( REFRESH_MODE = IF_SALV_C_REFRESH=>FULL ).
    CL_GUI_CFW=>FLUSH( ).
    GO_ALV->REFRESH( ).

Return is the same - old ALV is displayed. Like I said, TABLE_REF and GO_ALV are global attributes for my class, before calling refresh function I am checking the TABLE_REF and it's updated with the new information.

Problem may be solved with different parameter passed into T_TABLE, but I have no idea how to do that.

Re: Dynamic variable in class / problem with refreshing ALV

FredericGirod — Tue, 19 Oct 2021 11:05:30 GMT

I am little bit lost. Your <fs_table> is not global, you declare it just before the factory.

Did you try to declare it in the public section ?

Re: Dynamic variable in class / problem with refreshing ALV

kroslaniec — Tue, 19 Oct 2021 11:11:04 GMT

<fs_table> is declared locally in both methods - I couldnt figure out how to declare field symbol globally in a class.

Re: Dynamic variable in class / problem with refreshing ALV

Sandra_Rossi — Tue, 19 Oct 2021 12:50:47 GMT

No need to flush after REFRESH, it's doing the flush itself.

Re: Dynamic variable in class / problem with refreshing ALV

Sandra_Rossi — Tue, 19 Oct 2021 12:54:50 GMT

Are you recreating the internal table? SALV keeps reference of the original table only.

Re: Dynamic variable in class / problem with refreshing ALV

kroslaniec — Tue, 19 Oct 2021 13:05:32 GMT

I am calling prepare data method after the handle user command method, so in my global attribute TABLE_REF is updated with the new data. The problem is that I don't know how to pass it back to the GO_ALV without creating a new instance

Re: Dynamic variable in class / problem with refreshing ALV

Sandra_Rossi — Tue, 19 Oct 2021 16:59:12 GMT

Execute CREATE DATA TABLE_REF ... and ASSIGN TABLE_REF->* TO <FS_TABLE> the first time, and the next times only execute ASSIGN TABLE_REF->* TO <FS_TABLE>.