Does anyone know what framework or library codecademy uses for the file manager in its rails and angular tutorials? I am working on a project that needs this sort of functionality and prefer not building one from scratch if I don't have to.
What functionality? Seems to me like the closest thing to the description of file manager is the operating system.
If you mean displaying a tree view of available files where the end user can trigger events, then search for web file tree and you'll have a bunch of choices. That's just user interface though, dealing with how to display a tree, the file managing in that is just triggering extremely simple requests to a server where the file management is really happening.
I suppose I should have been more specific, but yes, I was asking about the file tree display for the user-interface layer.