abap2UI5

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Value Help ​

A field that asks "which one?" is the F4 moment of ABAP. abap2UI5 covers the basics with two built-in popups and lets you build anything custom on top.

Suggestions on the Input ​

The lightest variant — type-ahead from a bound list, no popup, no roundtrip after the initial render. Bind suggestionitems to an internal table and pick the columns via the suggestion_item template:

abap
TYPES: BEGIN OF ty_country,
         code TYPE c LENGTH 3,
         name TYPE string,
       END OF ty_country.
DATA mt_countries TYPE STANDARD TABLE OF ty_country.
DATA mv_country   TYPE string.

mt_countries = VALUE #( ( code = `DE` name = `Germany` )
                        ( code = `FR` name = `France`  )
                        ( code = `IT` name = `Italy`   ) ).

client->view_display( z2ui5_cl_xml_view=>factory(
    )->page(
        )->input(
            value             = client->_bind_edit( mv_country )
            showsuggestion    = abap_true
            suggestionitems   = client->_bind( mt_countries )
            )->suggestion_items(
                )->list_item( text = `{CODE}` additionaltext = `{NAME}`
    )->stringify( ) ).

Selection Popup ​

For a "pick from this list" dialog use the built-in Z2UI5_CL_POP_TO_SELECT. Pass any internal table, navigate to it as a sub-app, and read the result on return:

abap
CLASS z2ui5_cl_sample_f4 DEFINITION PUBLIC.

  PUBLIC SECTION.
    INTERFACES z2ui5_if_app.
    DATA mv_carrid TYPE string.

ENDCLASS.

CLASS z2ui5_cl_sample_f4 IMPLEMENTATION.
  METHOD z2ui5_if_app~main.

    CASE abap_true.

      WHEN client->check_on_init( ).
        client->view_display( z2ui5_cl_xml_view=>factory(
            )->page(
                )->input(
                    value            = client->_bind_edit( mv_carrid )
                    showvaluehelp    = abap_true
                    valuehelprequest = client->_event( `F4` )
            )->stringify( ) ).

      WHEN client->check_on_event( `F4` ).
        SELECT carrid, carrname, url FROM scarr INTO TABLE @DATA(lt_carriers).
        client->nav_app_call( z2ui5_cl_pop_to_select=>factory(
            i_tab   = lt_carriers
            i_title = `Choose airline` ) ).

      WHEN client->check_on_navigated( ).
        DATA(lo_prev) = CAST z2ui5_cl_pop_to_select( client->get_app_prev( ) ).
        DATA(ls_res)  = lo_prev->result( ).
        IF ls_res-check_confirmed = abap_true.
          FIELD-SYMBOLS <row> TYPE any.
          ASSIGN ls_res-row->* TO <row>.
          ASSIGN COMPONENT `CARRID` OF STRUCTURE <row> TO FIELD-SYMBOL(<carrid>).
          mv_carrid = <carrid>.
        ENDIF.

    ENDCASE.

  ENDMETHOD.
ENDCLASS.

Pass i_multiselect = abap_true for multi-pick; the result table is then in ls_res-table.

DDIC Search Help ​

For value helps that exist as DDIC search help objects (SE11 → search help), the generic search help builder wraps the F4 framework so you can fire any standard search help by name and get the picked row back. Install it like any other add-on.

Custom Dialog ​

When neither popup fits — e.g. a filter bar with multiple columns, ranges, fuzzy search — build the F4 as a separate app with its own view and call it via nav_app_call. See Popup → Separated App for the pattern.