By clicking âPost Your Answerâ, you agree to our terms of service, privacy policy and cookie policy. Found inside – Page 440At Owe load the collection of template tags available in djangobootstrap 4. ... navbarCollapse " aria - controls = " navbarCollapse " aria - expanded ... When the dropdown menu is collapsed or clicked again the navcolor class . navbar-toggler" type =" button" data-toggle =" collapse" data-target =" #navbarNavDropdown" aria-controls . Johann-S mentioned this issue on Dec 23, 2018. getSelectorFromElement return null on bad selectors #27912. Connect and share knowledge within a single location that is structured and easy to search. Be sure to add aria-expanded to the control element. Does the engine mount of a turboprop engine in an aircraft experience engine torque? Found inside – Page 352Converting the navigation component into Bootstrap 4 gives us the following: