Incremental Tree Construction (SAP Library

Incremental Tree Construction

Transferring node informatino to the SAP Tree at the frontend is a critical operation in performance terms. If you have a large tree with more than 500 nodes, you should not transfer the child nodes of a particular node to the frontend until the user actually expands that node.

Example

In the following structure, you should only add the nodes Root and Child1 into the SAP Tree. The child nodes of Child1 should not be transferred until the user actually expands the node.
This graphic is explained in the accompanying text

To do this, you must implement the following steps:

For node Child1, set the field EXPANDER = 'X' in the node structure ( TREEV_NODE ).
By doing this, you ensure that the event EXPAND_NO_CHILDREN is triggered when the user tries to expand this node.

In the event handler method, include a runtime that transfers the child nodes of the expanded node to the SAP Tree.

Example

An example of this is provided in the program SAPSIMPLE_TREE_CONTROL_DEMO .