AT SELECTION-SCREEN
AT SELECTION-SCREEN selscreen_event.
Effect 作用
This statement defines event blocks for different events selscreen_event that are triggered by the ABAP runtime environment during selection screen processing.
这个语句为在选择屏幕处理期间被ABAP运行环境触发的不同的事件定义事件块。
Selection screen events occur immediately before sending a selection screen and after certain user actions on a displayed selection screen. They assist in selection screen processing in the ABAP program.
选择屏幕事件在送出一个选择屏幕之前和在某个用户作用于一个显示的选择屏幕之后立即发生并且。它们在ABAP程序中帮助选择屏幕处理。
AT SELECTION-SCREEN is triggered at least twice during actions on selection screens that are linked into another selection screen as a subscreen - first for the linked selection screen itself, and then for the linking selection screens.
在作用于被连接到另外一个作为子屏幕的选择屏幕期间AT SELECTION-SCREEN 至少被触发两次――第一次为被连接的选择屏幕自己，之后为连接的选择屏幕。
Note 注
The event blocks after AT SELECTION-SCREEN are implemented internally as procedures. Declarative statments in these event blocks create local data.
在AT SELECTION-SCREEN 之后的事件块在内部作为过程被执行。在这些事件块中的声明语句生成本地数据。