What is the direction of data flow for On Parameters Changed compared to Event Handler?

The direction of data flow for "On Parameters Changed" and how it relates to an event handler is critical in understanding component interactions within the OutSystems platform. When parameters are changed in a screen or block, the "On Parameters Changed" event captures those changes. This event allows the block to respond to updates in the parameters it receives from its parent component.

The correct answer reflects that the data flows from the parent to the block, and potentially from the block back to the parent. This is because the parent component may pass new or updated data to the nested block through parameters, and any changes in the block can lead to updates that may need to push back information to the parent. This two-way communication is essential for synchronizing data and ensuring that both components are aligned with the latest information.

In scenarios not reflecting this flow, like the other options, the specifics do not accurately represent how components interact in a hierarchical manner or suggest incorrect relationships regarding data exchange. Hence, understanding this directional flow is vital for effectively managing interactions between different components within an OutSystems application.