本文介绍了ABAP编程中关于屏幕参数的可见性设置（ACTIVE），以及必输性（REQUIRED）和可输性（INPUT）的示例，包括如何通过LIKE、OBLIGETORY、RADIOBUTTONGROUP和USER-COMMAND等指令来控制屏幕元素的显示和验证规则。
1.可见性：ACTIVE
示例：
PARAMETERS:p_name LIKE tab-name MODIF ID m1,
p_age LIKE tab_age MODIF ID m2.
PARAMETERS:
p_radio1 RADIOBUTTON GROUP g1 USER-COMMAND sel DEFAULT 'X',
p_radio2 RADIOBUTTON GROUP g1.
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
IF p_radio1 EQ 'X' AND SCREEN-GROUP1 = 'M1'.
SCREEN-ACTIVE = '1'. "显示
MODIFY SCREEN.
ELSEIF p_radio2 EQ 'X' AND SCREEN-GROUP1 = 'M2'.
SCREEN-ACTIVE = '0'. "隐藏
MODIFY SCREEN.
ENDIF.
ENDLOOP.
2.必输性：REQUIRED
示例：
PARAMETERS:p_name LIKE tab-name OBLIGETORY , "名字 OBLIGATORY必输，有勾且系统会自动校验
p_age LIKE tab_age, "年龄
p_class LIKE tab_age, "班级
p_grade LIKE tab_age. "分数
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
IF SCREEN-NAME = 'P_AGE'.
SCREEN-REQUIRED = '0'. "不必输，没有勾
MODIFY SCREEN.
ELSEIF SCREEN-NAME = 'P_CLASS'.
SCREEN-REQUIRED = '1'. "必输,有勾且系统自动校验，等价于OBLIGATORY
MODIFY SCREEN.
ELSEIF SCREEN-NAME = 'P_GRADE'.
SCREEN-REQUIRED = '2'. "不必输，有勾，但系统不会自动校验，需要手动校验
MODIFY SCREEN.
ENDIF.
ENDLOOP.
3.可输性：INPUT
示例：
PARAMETERS:p_name LIKE tab-name, "名字
p_age LIKE tab_age. "年龄
AT SELECTION-SCREEN OUTPUT.
LOOP AT SCREEN.
IF SCREEN-NAME = 'P_NAME'.
SCREEN-INPUT = '1'. "可输入
MODIFY SCREEN.
ELSEIF SCREEN-NAME = 'P_AGE'.
SCREEN-INPUT = '0'. "禁止输入
MODIFY SCREEN.
ENDIF.
ENDLOOP.
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