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.
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.
原文：http://www.cnblogs.com/caizjian/p/3540704.html