The Requirement :

To implement a department hierarchy structure using Employee information maintained in SharePoint Lists.

Solution and Implementation:

So rather than implementing a pure jquery solution , I saved myself some time and instead used Nintex runtime functions to retrieve the user profile properties from the user profile (sync to active directory).

Please refer my blog-post to see the implementation :

Using Nintex and Jquery to create a department hierarchy structure in SharePoint on-premise

Final Result

Please add in your feedback if any !