Mapping in Webdynpro

Context Mapping

The variables defined in a Web Dynpro Controller context can be referenced from
other Web Dynpro controllers. This is called context mapping.

Context mapping allows a context node in one controller to be supplied automatically
with data from a corresponding context node in another controller. This is the primary
mechanism for sharing data between controllers.

Internal mapping:

When two controllers within the same component share data through a mapping
relationship, it is known as internal mapping.

External mapping. 

The mapping between controller contexts located in differentWeb Dynpro components
is known as external mapping.

Data binding

Data binding is the means by which data is automatically transported from a view
controller’s context to a UI element in its layout, and visa versa.

CrossComponent Context Mapping

• There are two ways to map context structures defined in different components:

• • The mapping origin is defined in the interface controller of the child component(direct context mapping).

• • The mapping origin is defined in a component controller or in a custom controller of the parent component (reverse context mapping).