Creating trees

In this recipe, we will see how we can display a tree in our Web Dynpro application. We will create a tree that will display the employee department-wise data, that is, nodes showing department names, each of which when opened will display a list of employees within the department along with the employee names.

For the sake of this recipe, we assume that we have an internal table DATA_TAB comprising of three fields, department, pernr, and sname containing the department name, employee number, and the employee names respectively sorted according to the department name.

How to do it...

We will now follow the steps as shown:

1. We first define a context node TREE_NODE. The TREE_NODE context node has a cardinality of 0..N and the Singleton property should be Off. An IS_OPENED attribute will be based on the type WDY_BOOLEAN.

2. Within the TREE_NODE context node there is another node, TREE_NODE_ITEM, which is also a non-singleton node having cardinality 0..N. An attribute ITEM_TEXT is created...