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To Get Field Details Saved in Variant Layout



 
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PostPosted: Wed Dec 15, 2010 2:02 pm    Post subject: To Get Field Details Saved in Variant Layout Reply with quote

To Get Field Details Saved in Variant Layout
Source: http://wiki.sdn.sap.com/wiki/display/ABAP/To+Get+Field+Details+Saved+in+Variant+Layout

We need to get fieldnames which are visible in alv for a layout variant change.

Basically when we change a layout for a alv display, number of fields displayed will change. Our requirement is to read the fieldnames as per the layout variant. For that purpose use following FM created. Here you need to pass default field catalog. This default catalog will have details of maximum fields.

Assumptions: Only we are hiding fields in display and no other functionality.

Code:
CALL FUNCTION 'LVC_VARIANT_SELECT'
  EXPORTING
    i_dialog            = ' '
    i_user_specific     = 'X'
    i_default           = 'X'
    it_default_fieldcat = defaultfield
  IMPORTING
    et_fieldcat         = fieldcat
  CHANGING
    cs_variant          = gw_variant
  EXCEPTIONS
    wrong_input         = 1
    fc_not_complete     = 2
    not_found           = 3
    program_error       = 4
    data_missing        = 5
    OTHERS              = 6.
IF sy-subrc <> 0.
  RAISE others.
ENDIF.

The parameter fieldcat will return the field details for the changed layout. For the fields hidden it will have NO_OUT field set as 'X'. These are fields which are hidden by layout change. You can use this return fieldcatalog to create dynamic tables and then can fetch data from the main table used for alv display.

The requirement where this is useful: We are able to display data in foreground using layout variant in report. We are using 'REUSE_ALV_GRID_DISPLAY_LVC' for ALV grid display. Now in background I need to save data to file only for those fields which were displayed in foreground for that variant. In this case above FM is useful.
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vga
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PostPosted: Wed Dec 15, 2010 2:10 pm    Post subject: Reply with quote

Code:
DATA: ls_varkey TYPE ltdxkey.

ls_varkey-report = sy-repid.
ls_varkey-variant = i_variant.
ls_varkey-type = 'F'.

CALL FUNCTION 'LT_DBDATA_READ_FROM_LTDX'
  EXPORTING
    is_varkey    = ls_varkey
  TABLES
    t_dbfieldcat = lt_fcat
  EXCEPTIONS
    not_found    = 1
    wrong_relid  = 2
    OTHERS       = 3.

DELETE lt_fcat WHERE param = 'NO_OUT'.
DELETE lt_fcat WHERE value = 'X'.

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