selectTree render type is used to display hierarchical data in a
A field with the
selectTree render type allows you to represent data in
a hierarchical manner, similar to a tree. It is typically used when working
with database tables that have a hierarchical structure. The properties treeConfig and
foreign_table are mandatory and must be provided to establish the
connection to the relevant database table. Optionally, you can also use
items or itemsProcFunc to pass the values, but these are not
sufficient on their own. The top-level item in the tree will always represent
the descriptive name of the table.
Regarding joining several tables, the
selectTree render type can handle multiple
tables through the configuration options.