Hi Abhishek,
Changing data in ALV and saving to database table can be easily achieved with classic ALV (Reuse_ALV_grid_display)
But the drop down feature of column is better implemented using OOPS ALV. With classic ALV it is possible though, to provide an F4 help which will also serve the purpose.
With oops ALV,
Drop down
CREATE OBJECT g_custom_container
EXPORTING container_name = 'CCONT'.
*create object for grid
CREATE OBJECT g_grid
EXPORTING i_parent = g_custom_container.
perform field_catolog. " Create field catalog for 42 fields.
* For all the fields set the edit attribute to 'X'. For drop down fields, F1, F2, F3, F4, set the drop down attribute too.
perform drop_table. " Populate all the list boxes.
CALL METHOD g_grid->set_table_for_first_display
EXPORTING
is_layout = gs_layout
CHANGING
it_fieldcatalog = gt_fieldcat
it_outtab = it_out.
form field_catalog.
....
ls_fcat-fieldname = 'F1'.
ls_fcat-tabname = 'IT_OUT'.
ls_fcat-seltext_l = text-h15.
ls_fcat-col_pos = lv_pos.
ls_fcat-edit = 'X'.
ls_fcat-drdn_hndl = '1'.
* drdn-hndl = '1' is the first list box
ls_fcat-outputlen = 15.
APPEND ls_fieldcat TO gt_fieldcat.
Similarly for fields F2, F3, F4
ls_fcat-drdn_hndl = '2'.
ls_fcat-drdn_hndl = '3'.
ls_fcat-drdn_hndl = '4'. respectively.
... ...
endform
form drop_table.
DATA: lt_dropdown TYPE lvc_t_drop,
ls_dropdown TYPE lvc_s_drop.
* First F1 listbox (handle '1').
ls_dropdown-handle = '1'.
ls_dropdown-value = 'Value 1'.
APPEND ls_dropdown TO lt_dropdown.
ls_dropdown-handle = '1'.
ls_dropdown-value = 'Value 2'.
APPEND ls_dropdown TO lt_dropdown.
Similarly for other drop down fields.
* For F2,
ls_dropdown-handle = '2'.
ls_dropdown-value = 'Value A'.
APPEND ls_dropdown TO lt_dropdown.
ls_dropdown-handle = '2'.
ls_dropdown-value = 'Value B'.
APPEND ls_dropdown TO lt_dropdown.
CALL METHOD g_grid->set_drop_down_table
EXPORTING
it_drop_down = lt_dropdown.
endform.
Save Data
Now to save data, code the following in the PAI of the ALV screen.
case ok_code.
when 'SAVE'.
CALLMETHOD g_grid->check_changed_data.
loopat it_out into wa_out.
modify ztable from wa_out.
ENDLOOP.