• 很多用户不习惯原生GRID的选择模式，所以业务需要用到自定义的选择框来进行数据的操作，显示效果如图所示，增加一条选择列，且配置全选和全选全选的按钮功能，如下图所示。

• 实现这种功能需要用到Fieldcat的参数控制以及GUI状态的配置和处理 
• 1.Fieldcat参数控制，将改成设置成选择框的样式，且该列可以被编辑。

** Fieldcat 变量定义
DATA:gt_fieldcat TYPE lvc_t_fcat,gs_fieldcat LIKE LINE OF gt_fieldcat.** FieldCat的宏
DATA gv_pos TYPE i.DEFINE %%add_fieldcat.gv_pos = gv_pos + 1.gs_fieldcat-col_pos = gv_pos.gs_fieldcat-fieldname = &1.gs_fieldcat-scrtext_m = &2.CASE &1.        "根据fieldname字段给结构做赋值控制WHEN 'SEL'.gs_fieldcat-checkbox = 'X'. "该列选择框显示gs_fieldcat-edit     = 'X'. "该列可以编辑ENDCASE.APPEND gs_fieldcat TO gt_fieldcat.CLEAR gs_fieldcat.
END-OF-DEFINITION.** Fieldcat字段映射处理%%add_fieldcat:'EBELN'    '采购单号',  "( 前面字段值不可变 后面字段描述可变 每一行都是)'EBELP'    '采购订单行号','SEL'      '选择'.

• 2.GUI状态的配置和处理。需要在GUI状态添加自定义按钮，并且做数据更新。ALV增加自定义按钮参考：https://mp.csdn.net/mp_blog/creation/editor/136279698

FORM frm_user_command USING r_ucomm LIKE sy-ucomm rs_selfield TYPE slis_selfield."应用方法将修改ALV的数据保存到内表中DATA lr_grid TYPE REF TO cl_gui_alv_grid.DATA l_tabix LIKE sy-tabix.  "系统参数   行号"此处代码将用户输入读入内表（这一步不可少）CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR' "自动刷新数据IMPORTINGe_grid = lr_grid.CALL METHOD lr_grid->check_changed_data.rs_selfield-refresh = 'X'.   "此处代码阻止'REUSE_ALV_GRID_DISPLAY创建新的屏幕，造成屏幕多层rs_selfield-row_stable = 'X'. "保证行、列位置在自动刷新时不变rs_selfield-col_stable = 'X'.CASE r_ucomm.WHEN 'ALL'.LOOP AT gt_data INTO gw_data.gw_data-sel = 'X'.MODIFY gt_data FROM gw_data.ENDLOOP.WHEN 'SAL'.LOOP AT gt_data INTO gw_data.gw_data-sel = ''.MODIFY gt_data FROM gw_data.ENDLOOP.ENDCASE.ENDFORM.

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• 完整代码

TYPES:BEGIN OF ty_data,sel TYPE char1,ebeln TYPE ekpo-ebeln,ebelp TYPE ekpo-ebelp,END OF ty_data.DATA gt_data TYPE TABLE OF ty_data.
DATA gw_data TYPE ty_data.** Layout  变量定义
DATA gs_layout   TYPE lvc_s_layo.** Fieldcat 变量定义
DATA:gt_fieldcat TYPE lvc_t_fcat,gs_fieldcat LIKE LINE OF gt_fieldcat.** FieldCat的宏
DATA gv_pos TYPE i.DEFINE %%add_fieldcat.gv_pos = gv_pos + 1.gs_fieldcat-col_pos = gv_pos.gs_fieldcat-fieldname = &1.gs_fieldcat-scrtext_m = &2.CASE &1.WHEN 'SEL'.gs_fieldcat-checkbox = 'X'. "当做选择框显示gs_fieldcat-edit     = 'X'. "该字段可以编辑ENDCASE.APPEND gs_fieldcat TO gt_fieldcat.CLEAR gs_fieldcat.
END-OF-DEFINITION.START-OF-SELECTION.SELECT ekpo~ebeln  "采购订单抬头数据- 采购单号ekpo~ebelp  "采购订单明细数据- 采购订单行号INTO CORRESPONDING FIELDS OF TABLE gt_dataFROM ekpoUP TO 20 ROWS.** Fieldcat字段映射处理%%add_fieldcat:'EBELN'    '采购单号',  "( 前面字段值不可变 后面字段描述可变 每一行都是)'EBELP'    '采购订单行号','SEL'      '选择'.** Layout布局处理gs_layout-cwidth_opt = 'X'.     "自动优化列宽 （可以使用**在一行代码面前注释掉 看看ALV会有什么效果）gs_layout-zebra = 'X'.          "斑马纹输出** 调用FunctionALV需要传入的参数：展示数据，FieldCat，Layout，StatusCALL FUNCTION 'REUSE_ALV_GRID_DISPLAY_LVC'EXPORTINGi_callback_program        = sy-repidi_callback_pf_status_set  = 'FRM_SET_STATUS'i_callback_user_command   = 'FRM_USER_COMMAND'is_layout_lvc             = gs_layoutit_fieldcat_lvc           = gt_fieldcatTABLESt_outtab                 = gt_data[]EXCEPTIONSprogram_error            = 1OTHERS                   = 2.FORM frm_set_status USING p_extab TYPE slis_t_extab.SET PF-STATUS 'STANDARD'.
ENDFORM.FORM frm_user_command USING r_ucomm LIKE sy-ucomm rs_selfield TYPE slis_selfield."应用方法将修改ALV的数据保存到内表中DATA lr_grid TYPE REF TO cl_gui_alv_grid.DATA l_tabix LIKE sy-tabix.  "系统参数   行号"此处代码将用户输入读入内表（这一步不可少）CALL FUNCTION 'GET_GLOBALS_FROM_SLVC_FULLSCR' "自动刷新数据IMPORTINGe_grid = lr_grid.CALL METHOD lr_grid->check_changed_data.rs_selfield-refresh = 'X'.   "此处代码阻止'REUSE_ALV_GRID_DISPLAY创建新的屏幕，造成屏幕多层rs_selfield-row_stable = 'X'. "保证行、列位置在自动刷新时不变rs_selfield-col_stable = 'X'.CASE r_ucomm.WHEN 'ALL'.LOOP AT gt_data INTO gw_data.gw_data-sel = 'X'.MODIFY gt_data FROM gw_data.ENDLOOP.WHEN 'SAL'.LOOP AT gt_data INTO gw_data.gw_data-sel = ''.MODIFY gt_data FROM gw_data.ENDLOOP.ENDCASE.ENDFORM.