ABAP_to_the_Future

12
Web Dynpro ABAP and Floorplan Manager
view’s job description. (If it tried to handle the response itself, then it would find
itself surrounded by a picket line of angry members of the controllers union
accusing it of trying to put honest, hardworking controllers out of a job.)
Defining the View for the List of Monsters
Now turn to the V_HEADER_GRID view, which is the view on which users will find
themselves when your application starts (the default view). You want two things
on this screen: the selection options and the ALV grid with the results. (In normal
ALV reports, the selection criteria are on a different screen, but users love having
the selection fields at the top of the result list to remind them what they were
actually searching for.)
Navigate to the V_HEADER_GRID view, and click the Layout tab. Your cursor is on
the ROOTUIELEMENTCONTAINER once again; right-click, and create two elements,
one after the other. This time, they will both be of the type ViewContainerUIElement,
which means that other UI elements will be living inside them. Name them
with the element type at the start, followed by what the container is going to contain
(i.e., VCUIE_SELECT_OPTIONS and VCUIE_MONSTER_HEADER_TABLE).
Note
In WDA, there are lots of options for how the system will automatically arrange the various
elements on the screen. There is not spac e in this book to go into all the various
options and what they mean, but they are all documented in great detail throughout
the Internet. For example, visit http://sapuniversity.eu/usage-and-significance-of-various-layouts-in-webdynpro-abap.
Here on the V_HEADER_GRID screen, you’re going to have the selections at the top
with the Select Monster button just to the right of the selection options, and the
grid showing the selected monster header records directly under those selection
fields. To achieve this, select the ROOTUIELEMENTCONTAINER node on the Layout
tab, and change the layout property to MatrixLayout. Then, go to the monster
table node and change the layout to MatrixHeadData (if you don’t do this, then
the grid appears to the right of the selections). If the field to change the layout of
the monster header table layout data is not there, click the Save button, and it will
magically appear.
While you’re here, you’re also going to add a button to display the monster
record that is currently highlighted in the ALV grid of monster headers. The
526