tree_menu
lazy
https://www.jstree.com/fiddle/?lazy
https://www.jstree.com/fiddle/?lazy&id=%23
[{"id":1,"text":"Root node","children":[{"id":2,"text":"Child node 1","children":true},{"id":3,"text":"Child node 2"}]}]https://www.jstree.com/fiddle/?lazy&id=2
["Child node 3","Child node 4"]
https://github.com/vakata/jstree
https://www.phpflow.com/jquery-plugin-2/10-most-popular-jquery-tree-menu-plugin/