Providing Data Using Value Nodes and Value
Attributes
If new data is to be available for the Web Dynpro application, you must define value nodes and value attributes. These affect the behavior of the custom controller context at runtime. Value nodes do not store data themselves, unlike model nodes, which refer to external model objects that store the data. You get a node collection that consists of node elements. The cardinality provides information about the number of possible node elements in a node collection.
Prerequisites
You have already
created a 
component as well
as the operating controller unit. For central data flow tasks, this is
generally the custom controller.
Procedure
To define value
nodes and value attributes for the context, proceed as described
in
Context
Structure.
Result
The subclass
contains set and get methods for the attributes. You can create an instance
for the subclass and fill it with data. The binding method is then called to
add the node instance to the context. In the application entity that contains
the event handlers, the binding routine can be accessed with:
context.bind<myValueNode>(…) |
At runtime, the framework calls the set and get methods to read or change the data in the context.
See also: