TreeNodeType Events

This property contains the action that is executed when the data for a compressed tree node that initially has no children is read from the back end only if required. This requires the implementation of a corresponding event handler. At runtime, this event handler is called when a tree node without data for its children is expanded. The Web Dynpro application can use the event handler to read data for the children of the expanded tree node and add this data to the tree. The node element that corresponds to the expanded tree node is passed as an event parameter in the event handler to the Web Dynpro application. This requires a Parameter Mapping , so the Web Dynpro framework can execute the automatic type conversion from the type of the event parameter to the type of the event handler parameter.

The event handler of the event onLoadChildren is only triggered during the expansion if no data for the children of the expanded node exists. If the application adds data during the expansion, the event is not triggered when the tree node is opened again.