// Instructions and best practices for building/modifying a UI Tree component displaying iModel data in a hierarchical way.
| name | imodel-hierarchical-data-ui |
| description | Instructions and best practices for building/modifying a UI Tree component displaying iModel data in a hierarchical way. |
Build/modify UI Tree component displaying iModel data in a hierarchical way defined by the user.
The tree component should be built in two parts: a data generation layer and a UI layer. The data generation layer is responsible for pulling data from the iModel. The UI layer is responsible for rendering the tree structure based on the data provided by the data generation layer.
To pull data from iModel, use @itwin/presentation-hierarchies library. This library provides a way to define how data should be pulled for each level of the tree. Documentation can be found here: https://github.com/iTwin/presentation/blob/master/packages/hierarchies/README.md.
To render the tree structure in the UI, use @itwin/presentation-hierarchies-react library. This library provides React components that can be used to render the tree structure based on the data provided by the data generation part. Documentation can be found here: https://github.com/iTwin/presentation/blob/master/packages/hierarchies-react/README.md.
Prefer placing the data generation part in a separate file from the UI part. This will allow for better separation of concerns and make it easier to maintain the code.
Data in iModel is structured based on ECSchemas and can be pulled using ECSQL queries. All ECSchemas are based on primitives defined in the BisCore schema (BIS).
Different domains can have their own ECSchema based on BisCore. For example, for structural engineering domain, there is a StructuralAnalysis ECSchema that defines classes related to structural analysis.
Schemas are defined in .ecschema.xml files and can be found here: https://github.com/iTwin/bis-schemas/tree/master/Domains/.