ValueSet $expand level-based hierarchy retrieval

[EniacMlezi]

I'm currently making a dropdown of a certain large hierarchical CodeSystem I have. I want the dropdown to be a browsable treeview. I would like to have the ability the retrieve all root concepts of my ValueSet first and display them collapsed in the treeview. When a concept in the treeview is clicked, I would like to be able to retrieve the next 'level', all concepts directly under the clicked concept.

Is there a way to do this easily already?

Environment:

• HAPI FHIR Version 7.6.0

[pmohanilc]

You can join Google Group for questions.

As far as I can tell, the treeview is certainly possible.
All you have to do is add includeHierarchy=true in the $expand.
For eg, http://localhost:8080/fhir/ValueSet/$expand?url=http://hl7.org/fhir/ValueSet/body-site&includeHierarchy=true