Toenable a Web Dynpro application toreactto user actions or to events raised by the system, certain UI elements have specific events. The Button has an event onAction , for example. If you define an action assigned to an event, an event handler is generated, too. You can reuse one action in several events and you can assign various actions to one event handler.
In a Web Dynpro application, the interaction results in a request being sent to the server by the browser. The Web Dynpro Framework analyses the event and calls either the event handler or, if you have enabled validation in the corresponding action, the generic validation service. In the latter case, the event handler is only called if all data is valid.
Beyond this you can enhance the UI handling by keyboard functions. You determine key combinations to trigger specific events or to focus a UI element.
More information: Implementing Hot Keys
More information: Enabling Access Keys
More information: Creating Actions
More information: Mapping Event Parameters to Action Parameters
More information: Mapping the Generic Event Parameter nodeElement
More Information