语法:
... MODIF ID modid
REPORT ZTESTMODIFID.
PARAMETERS show_all AS CHECKBOX USER-COMMAND flag.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
PARAMETERS: p1 TYPE c LENGTH 10,
p2 TYPE c LENGTH 10,
p3 TYPE c LENGTH 10.
SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME.
PARAMETERS: p4 TYPE c LENGTH 10 MODIF ID bl2,
p5 TYPE c LENGTH 10 MODIF ID bl2,
p6 TYPE c LENGTH 10 MODIF ID bl2.
SELECTION-SCREEN END OF BLOCK b2.
AT SELECTION-SCREEN OUTPUT. "当show_all值改变时会触发此事件
LOOP AT SCREEN.
IF show_all <> 'X' AND
screen-group1 = 'BL2'. "
screen-active = '0'. "设置组内设置屏幕的显示和隐藏
ENDIF.
MODIFY SCREEN. "把弃置应用到当前屏幕
ENDLOOP.
REPORT ZTESTMODIFID.
PARAMETERS show_all AS CHECKBOX USER-COMMAND flag.
SELECTION-SCREEN BEGIN OF BLOCK b1 WITH FRAME.
PARAMETERS: p1 TYPE c LENGTH 10,
p2 TYPE c LENGTH 10,
p3 TYPE c LENGTH 10.
SELECTION-SCREEN END OF BLOCK b1.
SELECTION-SCREEN BEGIN OF BLOCK b2 WITH FRAME.
PARAMETERS: p4 TYPE c LENGTH 10 MODIF ID bl2,
p5 TYPE c LENGTH 10 MODIF ID bl2,
p6 TYPE c LENGTH 10 MODIF ID bl2.
SELECTION-SCREEN END OF BLOCK b2.
AT SELECTION-SCREEN OUTPUT. "当show_all值改变时会触发此事件
LOOP AT SCREEN.
IF show_all <> 'X' AND
screen-group1 = 'BL2'. "
screen-active = '0'. "设置组内设置屏幕的显示和隐藏
ENDIF.
MODIFY SCREEN. "把弃置应用到当前屏幕
ENDLOOP.

本文介绍ABAP中MODIF ID的使用方法及其在选择屏幕参数中的应用。通过实例展示了如何利用MODIF ID实现参数的分组及屏幕的动态显示与隐藏。
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