Problem with ALV Grid Top-of-Page - How to print more than 60 characters?

Problem:

Normally in ALV grid TOP_OF_PAGE, we cannot display information of more than 60 characters long. This is due to the limitation of the FM REUSE_ALV_COMMENTARY_WRITE. Usually we call this FM from the subroutine that is linked with TOP_OF_PAGE event.

CALL FUNCTION 'REUSE_ALV_COMMENTARY_WRITE'
 EXPORTING
  it_list_commentary       =
  i_logo                   =
  i_end_of_list_grid       =
         .

*"---------------------------------------------------------------
*"*"Lokale Schnittstelle:
*"       IMPORTING
*"             VALUE(IT_LIST_COMMENTARY) TYPE  SLIS_T_LISTHEADER
*"             REFERENCE(I_LOGO) OPTIONAL
*"             REFERENCE(I_END_OF_LIST_GRID) OPTIONAL
*"--------------------------------------------------------------

In this above FM, exporting parameter ‘IT_LIST_COMMENTARY’ contains a field ‘INFO’ that is only 60 characters long. And it is responsible for displaying the information in the TOP_OF_PAGE area.

Solution:

To overcome this limitation we can use dynamic document, which can be implemented through the class CL_DD_DOCUMENT. As dynamic documents use HTML viewer control so instead of triggering the TOP_OF_PAGE event we should trigger event of HTML TOP_OF_PAGE.

First create a subroutine for top of page in HTML format and send that name in I_CALLBACK_HTML_TOP_OF_PAGE parameter of ALV function module. The input parameter for this subroutine will be a variable of class CL_DD_DOCUMENT.

*-----------------------------------------------------------------*
*       FORM html_top_of_page                                     *
*-----------------------------------------------------------------*
FORM html_top_of_page USING top TYPE REF TO cl_dd_document.
 data: l_text(255) type c.
do 180 times.

  l_text+sy-index(1) = '*'.
enddo.

  CALL METHOD top->add_text EXPORTING text = 'Hello world '
                                     sap_style = 'heading' .
 CALL METHOD top->add_gap EXPORTING width = 200.
 CALL METHOD top->add_picture EXPORTING picture_id = 'ENJOYSAP_LOGO'.
 CALL METHOD top->NEW_LINE( ).
 CALL METHOD top->add_text EXPORTING
 text = l_text.

ENDFORM.

* Display ALV grid
CALL FUNCTION 'REUSE_ALV_GRID_DISPLAY'
    EXPORTING
         i_callback_html_top_of_page = 'HTML_TOP_OF_PAGE'
         i_callback_program          = g_repid
         i_structure_name            = 'SFLIGHT'
    TABLES
         t_outtab                    = gt_outtab.

Output:

Limitations:

As dynamic documents use SAP HTML Viewer control internally, so whatever limitations exist for SAP HTML Viewer, same limitations hold true for dynamic documents also.