Abap 在AT选择屏幕中设置从属列表框的值_Abap_Dynpro

Abap 在AT选择屏幕中设置从属列表框的值

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Abap 在AT选择屏幕中设置从属列表框的值,abap,dynpro,Abap,Dynpro,我使用ABAP屏幕列表框创建了一个带有一些选择的报告 REPORT z_prueba. TYPE-POOLS: vrm. DATA : name TYPE vrm_id, list TYPE vrm_values, value LIKE LINE OF list, aux(85) TYPE c. DATA: i_grupo TYPE STANDARD TABLE OF ztart_mto_1, i_materia

我使用ABAP屏幕列表框创建了一个带有一些选择的报告

REPORT z_prueba.

TYPE-POOLS: vrm.

DATA : name    TYPE vrm_id,
       list    TYPE vrm_values,
       value   LIKE LINE OF list,
       aux(85) TYPE c.

DATA: i_grupo     TYPE STANDARD TABLE OF ztart_mto_1,
      i_material  TYPE STANDARD TABLE OF ztart_mto_2,
      i_aux       TYPE STANDARD TABLE OF ztart_mto_2,
      wa_grupo    TYPE ztart_mto_1,
      wa_material TYPE ztart_mto_2,
      wa_aux      TYPE ztart_mto_2.


SELECTION-SCREEN BEGIN OF BLOCK cab WITH FRAME TITLE tcab.
PARAMETERS:
  grupo TYPE ztart_mto_1-grupo AS LISTBOX VISIBLE LENGTH 80 USER-COMMAND gr.
SELECTION-SCREEN END OF BLOCK cab.

SELECTION-SCREEN BEGIN OF BLOCK art WITH FRAME TITLE tart.
PARAMETERS:
  articulo TYPE ztart_mto_2-refn AS LISTBOX VISIBLE LENGTH 80 USER-COMMAND art.
SELECTION-SCREEN END OF BLOCK art.

INITIALIZATION.
  tcab = 'Grupo de artículos'.
  tart = 'Artículo del grupo'.

  SELECT * INTO TABLE i_grupo FROM ztart_mto_1.
  CLEAR list.
  REFRESH list.
  LOOP AT i_grupo INTO wa_grupo.
    CLEAR value.
    CLEAR aux.
    CONCATENATE wa_grupo-grupo ` - `  wa_grupo-denom INTO aux.
    value-key = wa_grupo-grupo.
    value-text = aux.
    APPEND value TO list.
  ENDLOOP.

  name = 'grupo'.

  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = name
      values = list.

  CLEAR name.
  CLEAR list.
  CLEAR i_grupo.
  CLEAR wa_grupo.

AT SELECTION-SCREEN ON VALUE-REQUEST FOR grupo.
  IF grupo = ''.

    "HERE I NEED TO PUT THE VALUE OF articulo IN BLANK

  ELSE.

    SELECT * FROM ztart_mto_2 WHERE grupo = @grupo INTO TABLE @i_material.

    LOOP AT i_material INTO wa_material.
      CLEAR value.
      CLEAR aux.
      CONCATENATE wa_material-refn ` - `  wa_material-descr INTO aux.
      value-key = wa_material-refn.
      value-text = aux.
      APPEND value TO list.
    ENDLOOP.

    name = 'articulo'.

    CALL FUNCTION 'VRM_SET_VALUES'
      EXPORTING
        id     = name
        values = list.

    articulo = ''.

    CLEAR grupo.
    CLEAR aux.
    CLEAR name.
    CLEAR list.
    CLEAR i_material.
    CLEAR wa_material.
    REFRESH i_material.

  ENDIF.

当grupo的值为空时，我需要更改articulo的值

当我为grupo和articulo设置了一个值，然后将grupo设置为空白时，articulo不会改变

如果您只想在清空“grupo”后清空“articulo”，则可以在at选择屏幕输出事件块中实现If块

AT SELECTION-SCREEN OUTPUT.
  IF grupo IS INITIAL.
    CLEAR articulo.
  ENDIF.

阅读此内容。

如果您只想在清空“grupo”后清空“articulo”，则可以在at选择屏幕输出事件块中实现If块

AT SELECTION-SCREEN OUTPUT.
  IF grupo IS INITIAL.
    CLEAR articulo.
  ENDIF.

阅读此文。

对于值请求POV上的事件进程的行为，您弄错了，在选择屏幕的情况下，它对应于…的值请求上的选择屏幕上的事件块，在dynpros中，它是值请求上的事件块进程，与下拉列表框字段一起使用时非常具体

在这种情况下，并且仅在这种情况下，在输出PBO之前的过程中，在屏幕显示之前调用POV，而不是在按下下拉按钮时调用POV，因为其他类型的字段通常都是这样

这意味着您的代码在第一次显示屏幕时会两次初始化Articulo字段的可能值

有几种解决方案可以在列表框中列出可能的值，其中之一是在PBO期间通过调用功能模块VRM_SET_values来定义这些值。不需要POV。以下是一个可以在任何基于ABAP的系统中运行的解决方案：

TABLES sscrfields.

PARAMETERS country TYPE land1 AS LISTBOX VISIBLE LENGTH 20 USER-COMMAND country_changed.
PARAMETERS carrid TYPE s_carr_id AS LISTBOX VISIBLE LENGTH 20.

AT SELECTION-SCREEN OUTPUT.
  DATA(lt_value) = VALUE vrm_values(
      ( key = 'FR' text = 'France' )
      ( key = 'DE' text = 'Allemagne' ) ).
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = 'COUNTRY'
      values          = lt_value
    EXCEPTIONS
      id_illegal_name = 1
      OTHERS          = 2.
  lt_value = switch #( COUNTRY
        when '' then VALUE #( )
        when 'FR' then VALUE #(
              ( key = 'AF' text = 'Air France' )
              ( key = 'TO' text = 'Transavia' ) )
        when 'DE' then value #(
              ( key = 'EW' text = 'Eurowings' )
              ( key = 'LH' text = 'Lufthansa' ) ) ).
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = 'CARRID'
      values          = lt_value
    EXCEPTIONS
      id_illegal_name = 1
      OTHERS          = 2.

AT SELECTION-SCREEN.
  IF sscrfields-ucomm = 'COUNTRY_CHANGED'.
    carrid = ''.
  ENDIF.

对于值请求POV上的事件进程的行为，您弄错了。在选择屏幕的情况下，它对应于…的值请求上的选择屏幕上的事件块，在dynpros中，它是值请求上的事件块进程，这在与下拉列表框字段一起使用时非常具体

这意味着您的代码在第一次显示屏幕时会两次初始化Articulo字段的可能值

TABLES sscrfields.

PARAMETERS country TYPE land1 AS LISTBOX VISIBLE LENGTH 20 USER-COMMAND country_changed.
PARAMETERS carrid TYPE s_carr_id AS LISTBOX VISIBLE LENGTH 20.

AT SELECTION-SCREEN OUTPUT.
  DATA(lt_value) = VALUE vrm_values(
      ( key = 'FR' text = 'France' )
      ( key = 'DE' text = 'Allemagne' ) ).
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = 'COUNTRY'
      values          = lt_value
    EXCEPTIONS
      id_illegal_name = 1
      OTHERS          = 2.
  lt_value = switch #( COUNTRY
        when '' then VALUE #( )
        when 'FR' then VALUE #(
              ( key = 'AF' text = 'Air France' )
              ( key = 'TO' text = 'Transavia' ) )
        when 'DE' then value #(
              ( key = 'EW' text = 'Eurowings' )
              ( key = 'LH' text = 'Lufthansa' ) ) ).
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id              = 'CARRID'
      values          = lt_value
    EXCEPTIONS
      id_illegal_name = 1
      OTHERS          = 2.

AT SELECTION-SCREEN.
  IF sscrfields-ucomm = 'COUNTRY_CHANGED'.
    carrid = ''.
  ENDIF.

关于您的代码的几点信念：

许多变量是冗余的，比如value、aux等，所有的连接都可以动态完成。VRM类型声明也是冗余的。不需要在单独的变量中定义listbox名称，因为这会降低代码的可读性。 Sandra说得绝对正确，这里的POV事件将不起作用，您需要简单的选择屏幕输出所有的DB选择都可以删除到初始化事件中，并且只能执行一次，不会滥用性能。所以，在内部表上进行所有操作时，不必清除每个输出的主itab，而是使用i_aux var填充列表框。下面是您的代码的简化版本，它将ztart_mtoXX类型模拟为本地类型

TYPES: BEGIN OF ztart_mto_1,
         grupo TYPE char100,
         denom TYPE char100,
       END OF ztart_mto_1,
       BEGIN OF ztart_mto_2,
         refn  TYPE char100,
         descr TYPE char100,
         grupo TYPE char100,
       END OF ztart_mto_2.

DATA: i_grupo    TYPE TABLE OF ztart_mto_1 WITH EMPTY KEY,
      i_material TYPE TABLE OF ztart_mto_2 WITH EMPTY KEY,
      i_aux      TYPE TABLE OF ztart_mto_2 WITH EMPTY KEY,
      list       TYPE vrm_values.

PARAMETERS: grupo    TYPE char100 AS LISTBOX VISIBLE LENGTH 80 USER-COMMAND gr,
            articulo TYPE char100 AS LISTBOX VISIBLE LENGTH 80 USER-COMMAND art.

INITIALIZATION.
  i_grupo    = VALUE #( ( grupo = '' denom = '' ) ( grupo = 'AGROUP' denom = 'AGROUP_DENOM' ) ( grupo = 'BGROUP' denom = 'BGROUP_DENOM' ) ( grupo = 'CGROUP' denom = 'CGROUP_DENOM' ) ).
  i_material = VALUE #( ( refn = 'A119' descr = 'A material' grupo = 'AGROUP' ) ( refn = 'B119' descr = 'B material' grupo = 'BGROUP' ) ( refn = 'C119' descr = 'C material' grupo = 'CGROUP' ) ).

  LOOP AT i_grupo INTO DATA(wa_grupo).
    APPEND VALUE vrm_value( key = wa_grupo-grupo text = wa_grupo-grupo && ` - ` && wa_grupo-denom ) TO list.
  ENDLOOP.

  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'grupo'
      values = list.
  CLEAR list.

AT SELECTION-SCREEN.

  CHECK sy-ucomm = 'GR'.
  CLEAR articulo.
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'articulo'
      values = list.
  CLEAR list.

AT SELECTION-SCREEN ON grupo.

  CHECK sy-ucomm = 'GR' AND grupo IS NOT INITIAL.

  i_aux = VALUE #( FOR ls_mat IN i_material WHERE ( grupo = grupo ) ( ls_mat ) ).
  LOOP AT i_aux INTO DATA(wa_material).
    APPEND VALUE vrm_value( key = wa_material-refn text = wa_material-refn && ` - ` && wa_material-descr ) TO list.
  ENDLOOP.

  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'articulo'
      values = list.

尽管Sandra的解决方案更为优雅，但这只是一个与您的逻辑更为相似的选项。

关于您的代码的几个信念：

TYPES: BEGIN OF ztart_mto_1,
         grupo TYPE char100,
         denom TYPE char100,
       END OF ztart_mto_1,
       BEGIN OF ztart_mto_2,
         refn  TYPE char100,
         descr TYPE char100,
         grupo TYPE char100,
       END OF ztart_mto_2.

DATA: i_grupo    TYPE TABLE OF ztart_mto_1 WITH EMPTY KEY,
      i_material TYPE TABLE OF ztart_mto_2 WITH EMPTY KEY,
      i_aux      TYPE TABLE OF ztart_mto_2 WITH EMPTY KEY,
      list       TYPE vrm_values.

PARAMETERS: grupo    TYPE char100 AS LISTBOX VISIBLE LENGTH 80 USER-COMMAND gr,
            articulo TYPE char100 AS LISTBOX VISIBLE LENGTH 80 USER-COMMAND art.

INITIALIZATION.
  i_grupo    = VALUE #( ( grupo = '' denom = '' ) ( grupo = 'AGROUP' denom = 'AGROUP_DENOM' ) ( grupo = 'BGROUP' denom = 'BGROUP_DENOM' ) ( grupo = 'CGROUP' denom = 'CGROUP_DENOM' ) ).
  i_material = VALUE #( ( refn = 'A119' descr = 'A material' grupo = 'AGROUP' ) ( refn = 'B119' descr = 'B material' grupo = 'BGROUP' ) ( refn = 'C119' descr = 'C material' grupo = 'CGROUP' ) ).

  LOOP AT i_grupo INTO DATA(wa_grupo).
    APPEND VALUE vrm_value( key = wa_grupo-grupo text = wa_grupo-grupo && ` - ` && wa_grupo-denom ) TO list.
  ENDLOOP.

  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'grupo'
      values = list.
  CLEAR list.

AT SELECTION-SCREEN.

  CHECK sy-ucomm = 'GR'.
  CLEAR articulo.
  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'articulo'
      values = list.
  CLEAR list.

AT SELECTION-SCREEN ON grupo.

  CHECK sy-ucomm = 'GR' AND grupo IS NOT INITIAL.

  i_aux = VALUE #( FOR ls_mat IN i_material WHERE ( grupo = grupo ) ( ls_mat ) ).
  LOOP AT i_aux INTO DATA(wa_material).
    APPEND VALUE vrm_value( key = wa_material-refn text = wa_material-refn && ` - ` && wa_material-descr ) TO list.
  ENDLOOP.

  CALL FUNCTION 'VRM_SET_VALUES'
    EXPORTING
      id     = 'articulo'
      values = list.

虽然Sandra的解决方案更为优雅，但这只是一个与您的逻辑更为相似的选项。

很好！但是现在，当articulo设置了一个值，并且我更改了grupo时，我想清除articulo列表框的内容，然后根据grupo值再次收费Good！但是现在当articulo设置了一个值，我改变了grupo，我想清除articulo列表框的内容，然后根据grupo值再次收费