F4 help for ALV table field

Question

Hi Experts,
I need to implement F4 help for ALV table field.
I my scenario, I am using two views. If we click on any record in fist view then it displays the popup window (second view) with relevant record details.
Here one of the columns having fieldnames corresponding values (old values), for correcting old values I have created new value editable column, we can enter new value for old value then we can save it. Till this functionality is ok.
Then I have included OVS help for new value field. Here I need to get f4 help for newvalue field relevant to fieldname.
For example: user clicks on f4 in cell (new value) then if corresponding fieldname is u2018WERKSu2019 then it shows the plant values
Here I can get fieldname, domain name  and value table using method set_attribute ().
Same concept I have implemented in ALV using F4IF_FIELD_VALUE_REQUEST. It is working fine
Here I have little bit confusion. Please advise me how to implement in OVS.
Regards,
BBC

Answer 1

Hi,
you'll have to create a method for the OVS search help (define it in the "OVS component usage" field in the context).
Sample code (should work for WERKS):
method on_ovs .
declare data structures for the fields to be displayed and
for the table columns of the selection list, if necessary
  types:
    begin of lty_stru_input,
  add fields for the display of your search input here
      WERKS TYPE WERKS,
    end of lty_stru_input.
  types:
    begin of lty_stru_list,
  add fields for the selection list here
      WERKS TYPE WERKS_D,
      NAME1 type NAME1,
    end of lty_stru_list.
  data: ls_search_input  type lty_stru_input,
        lt_select_list   type standard table of lty_stru_list,
        ls_text          type wdr_name_value,
        lt_label_texts   type wdr_name_value_list,
        lt_column_texts  type wdr_name_value_list,
        lv_window_title  type string,
        lv_group_header  type string,
        lv_table_header  type string,
        lv_werks type werks_d.
  field-symbols: <ls_query_params> type lty_stru_input,
                 <ls_selection>    type lty_stru_list.
  case ovs_callback_object->phase_indicator.
    when if_wd_ovs=>co_phase_0.  "configuration phase, may be omitted
  in this phase you have the possibility to define the texts,
  if you do not want to use the defaults (DDIC-texts)
Set label from Medium Description to something more logical...
      ls_text-name = `NAME1`.  "must match a field in list structure
      ls_text-value = `Plant description`.
      insert ls_text into table lt_label_texts.
Set col header from Medium Description to something more logical...
      ls_text-name = `NAME1`.  "must match a field in list structure
      ls_text-value = `Plant description`.
      insert ls_text into table lt_column_texts.
     lv_window_title = wd_assist->get_text( `003` ).
     lv_group_header = wd_assist->get_text( `004` ).
     lv_table_header = wd_assist->get_text( `005` ).
      ovs_callback_object->set_configuration(
                label_texts  = lt_label_texts
                column_texts = lt_column_texts
                group_header = lv_group_header
                window_title = lv_window_title
                table_header = lv_table_header
                col_count    = 2
                row_count    = 20 ).
    when if_wd_ovs=>co_phase_1.  "set search structure and defaults
  In this phase you can set the structure and default values
  of the search structure. If this phase is omitted, the search
  fields will not be displayed, but the selection table is
  displayed directly.
  Read values of the original context (not necessary, but you
  may set these as the defaults). A reference to the context
  element is available in the callback object.
     ovs_callback_object->context_element->get_static_attributes(
         importing static_attributes = ls_search_input ).
    pass the values to the OVS component
     ovs_callback_object->set_input_structure(
         input = ls_search_input ).
    when if_wd_ovs=>co_phase_2.
  If phase 1 is implemented, use the field input for the
  selection of the table.
  If phase 1 is omitted, use values from your own context.
      if ovs_callback_object->query_parameters is not bound.
      endif.
      assign ovs_callback_object->query_parameters->*
                              to <ls_query_params>.
      if not <ls_query_params> is assigned.
TODO exception handling
      endif.
        call method ovs_callback_object->context_element->get_attribute
          exporting
            name  = 'WERKS'
          importing
            value = lv_werks.
        data: lv_subcat_text type rstxtmd.
        select werks
               name1
          into table lt_select_list
          from T001W.
        ovs_callback_object->set_output_table( output = lt_select_list ).
    when if_wd_ovs=>co_phase_3.
  apply result
      if ovs_callback_object->selection is not bound.
      endif.
      assign ovs_callback_object->selection->* to <ls_selection>.
      if <ls_selection> is assigned.
        ovs_callback_object->context_element->set_attribute(
                               name  = `WERKS`
                               value = <ls_selection>-werks ).
      endif.
  endcase.
endmethod.