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It is a component with zero views and zero windows. Such a component is known as a “faceless” component and is useful when a complex unit of functionality requiring no direct user interaction needs to be encapsulated. A good example of a faceless component is the creation of something called a model component. This is not actually a specific Web Dynpro component type; rather it is a standard Web Dynpro component that has been written specifically for the task of interacting with a model object.
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The recursion node is a special type of node used when a node hierarchy with a recursive structure needs to be created. This is needed when, for instance, the depth of the node hierarchy is not known until runtime. Using a recursion node, you can declare that a particular node structure is replicated as a child of itself. A good example here is if your context needs to hold information in the same structure as a file system, containing directories and subdirectories.
There is a special type of view known as the empty view. This view requires no manual implementation, neither is it possible to interact with it in any way other than invoking its default inbound plug – show Empty View. If you require one particular area of a view set to be empty, then you should embed the empty view into the view area.
You can then treat this view just like any other view you have written, except that calling its inbound plug will cause the corresponding view area to be blanked out. If a view set has had no views manually embedded into one of its view areas, then the empty view will be substituted automatically.
In both Web Dynpro for ABAP and Java, there is a specific UI Element called the View Container. This UI element, when added to a view layout, acts as a container for any other view. View Containers can be arranged in a large variety of ways in order to achieve the desired layout on the screen.
The views that can be embedded into a View Container UI element are the following:
A view set is a visual framework that subdivides the window into predefined areas. Each subdivision of a view set is known as a view area, and multiple views can be embedded into a single View Area.
The following preconfigured view sets are available:
The Web Dynpro framework has been built to follow the principle of Lazy Data Access. This means that the processing required to generate data will not be invoked until the data is actually needed. When this principle is applied to the architecture of the context, it means that unless there is an attempt to access the data in a singleton child node, then even though the lead selection in the parent node has changed, the child node’s supply function will not be called.
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There must be a suitable node available to act as a mapping origin
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