ABAP_to_the_Future

Building the WDA Application 12.2
Figure 12.20 Creating an Outbound Plug
Once you’ve defined an outbound plug, you can enter data in the lower half of
the Outbound Plug tab (Figure 12.21), in the section with Importing Parameter
from at the top. You almost always want to send data between views so that you
can have as many parameters as you want, rather like events in OO programming.
This is an outbound parameter from the sending view’s perspective, but the WDA
framework has chosen to call it an “importing” parameter on the grounds that it
will be imported into other views. You could send the monster number and have
the system look up the monster header record, but as you already have all the
fields, that seems rather wasteful—so send the whole record.
Figure 12.21 Creating an Outbound Plug Parameter
As we all know, what goes up, must come down. Now you have an outbound
plug looking for a home, so you need to define a corresponding inbound plug in
the target view. Simply navigate to the target view ( V_DISPLAY_MONSTER) and
select the Inbound Plug tab (Figure 12.22).
The difference between the outbound and inbound plugs is that when you add an
entry in the Inbound Plug tab called IP_FROM_MONSTER_TABLE, an event handler
method called HANDLEIP_FROM_HEADER_TABLE is created for you (you’ll be coding
this method in Section 12.2.8).
Now, create the linkage between the two plugs by going to the Window tab of
the W_MONSTER_MONITOR window, selecting the outbound plug leaving the V_HEAD-
ER_GRID, right-clicking, and choosing Create Navigation Link.
533