Supply function in webdynpro for abap

Question

Hi ,
        I have tree structure as below.
1.      Node A
               1.a      Node B
                   1.a.i    Node C
        I have declared method 'Method_A' as supply function for Node A.similarly
        I have declared method 'Method_B' as supply function for Node B.similary
        I have declared method 'Method_C' as supply function for Node C.
        When I am executing in debugging mode both 'Method_A' and 'Method_B' is triggering for initial display of tree. Without expanding Node A ,we are already getting the Node B data and storing in corresponding nodes. This is becoming performance issue as I am hitting database in those 3 methods. My problem is without expanding why that 'Method_B' supply function is
triggering. Please let me know if you have any idea.
Thanks,
Suma

Answer 1

The supply function is always get triggered even if you do not expand the parent node in tree.
Reason: It fills the value to the child node based on parent's value.
To avoid this, you can set teh condition as follows:
In node B supply function, method_B:
check the instance of parent node A here, and if that is not initial, then only hit the database for filling node B.
In node C supply function, method_C:
Check the instance of parent node B here, and if that is not initial, then only hit the database for filling node C.
This is the only possible solution one can think of.