alv行可编辑时带出描述

ALV显示可以编辑的状态下可以带出描述信息等，比如维护表程序输入公司代码时需要带出公司代码的描述，这时就需要通过下面事件来触发

定义一个类：

CLASS lcl_event_receiver DEFINITION.

  PUBLIC SECTION.

    METHODS:handle_data_changed
      FOR EVENT data_changed OF cl_gui_alv_grid
      IMPORTING er_data_changed.

ENDCLASS. 

定义此类一个方法

CLASS lcl_event_receiver IMPLEMENTATION.

*--DATA_CHANGED
  METHOD handle_data_changed.

    PERFORM handle_data_changed CHANGING er_data_changed.

  ENDMETHOD.                    "HANDLE_CHANGED_DATA

ENDCLASS.

定义类的引用：

***带出描述
DATA: g_event_receiver   TYPE REF TO lcl_event_receiver.

    CREATE OBJECT g_event_receiver.
    SET HANDLER g_event_receiver->handle_data_changed FOR gr_alvgrid.
    
    ***带出描述
    CALL METHOD gr_alvgrid->register_edit_event
      EXPORTING
        i_event_id = cl_gui_alv_grid=>mc_evt_modified.

类的方法form

FORM handle_data_changed  CHANGING ir_data_changed
                                   TYPE REF TO cl_alv_changed_data_protocol.
  DATA: ls_mod_cell TYPE lvc_s_modi,
        lv_value    TYPE lvc_value,
        l_name1     TYPE zbwppt004-zplct.

***得到生产线描述
  LOOP AT ir_data_changed->mt_mod_cells
                           INTO ls_mod_cell.
    IF ls_mod_cell-fieldname = 'ZKPLC'.
      CALL METHOD ir_data_changed->get_cell_value     ”方法gt_cell_value用户获取所要的单元格数据
        EXPORTING
          i_row_id    = ls_mod_cell-row_id    “单元格的ID
          i_fieldname = 'ZKPLC'               "单元格的字段
        IMPORTING
          e_value     = lv_value.             "单元格的字段值

      IF lv_value IS NOT INITIAL.

        SELECT SINGLE zplct                  "根据取到的单元格字段值取得改字段的描述赋给变量l_name1
          INTO l_name1
          FROM zbwppt004
         WHERE zkplc = lv_value.

        CALL METHOD ir_data_changed->modify_cell  "修改单元格的值的方法
          EXPORTING
            i_row_id    = ls_mod_cell-row_id      ”单元格的ID
            i_fieldname = 'ZPLCT'                 "单元格的字段
            i_value     = l_name1.                “单元格的字段值是刚才得到的变量l_name1
      ELSE.
        CALL METHOD ir_data_changed->modify_cell
          EXPORTING
            i_row_id    = ls_mod_cell-row_id
            i_fieldname = 'ZPLCT'
            i_value     = ''.
      ENDIF.
    ENDIF.
    CLEAR lv_value.
  ENDLOOP.

ENDFORM.