We can create javascript treeview component quickly with jsTree. It accepts various data sources including predefined HTML, JSON and XML. User can open, close, rename, create, delete nodes easily. jsTree supports drag & drop and multiple select as well. And also, jsTree supports easy CSS customization of icons, dots, background, fonts & sizes. So that you can create your own unique javascript treeview component easily.

Requirements: jQuery Framework
Demo: http://www.jstree.com/jsTree/examples/
License: MIT, GPL License