This controller cares for view-specific flow logic, like checking user input and handling user actions. View controllersĮach view consists of the layout part and exactly one view controller. This controller is instantiated as the first controller of the component. Any other controller can access the configuration controller, but the configuration controller cannot access any other controller. Only one configuration controller may exist in any component. It is only necessary if the corresponding component implements special configuration and personalization functionality. Custom controller instances cannot be deleted explicitly. The instantiation of a custom controller is delayed until the first method of the controller is called. Custom controllers are instantiated automatically by the Web Dynpro framework and the instantiation order is undefined therefore, the coding in a custom controller should make no assumptions about the existence of any other custom controller. Multiple custom controllers can be defined in a component.
They have to be defined at design time and can be used to encapsulate sub-functions of the component controller. Custom controllersĬustom controllers are optional. When starting a Web Dynpro application, the component controller is instantiated by the Web Dynpro runtime 2. The lifetime of the component controller equals the lifetime of the component. The component controller drives the functionality of the entire component. This is a global controller, visible to all other controllers. There is only one component controller per Web Dynpro component. These different controller types differ in the entities they are composed of:- 1. There are four types of controllers in an ABAP Web Dynpro component. Any programming of flow logic requires the knowledge of how controllers are defined and what kind of entities they offer.
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Controllers contain the source code of a Web Dynpro application they hold the context data and care for event handling and navigation. Different instances of controllers and contexts exist within a Web Dynpro application. The data that a controller can access is defined in the corresponding context. They define how the user can interact with the Web Dynpro application. Controllers are the active parts of a Web Dynpro application.
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