// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory,
// lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced
// here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file.
//
// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
// about supported directives.
//

//= require jquery2
//= require jquery_ujs
//= require jquery.cookie
//= require bootstrap-sprockets
//= require jquery.slick
//= require dropzone

// This is a manifest file that'll be compiled into application.js, which will include all the files
// listed below.
//
// Any JavaScript/Coffee file within this directory,
// lib/assets/javascripts, vendor/assets/javascripts,
// or any plugin's vendor/assets/javascripts directory can be referenced
// here using a relative path.
//
// It's not advisable to add code directly here, but if you do, it'll appear at the bottom of the
// compiled file.
//
// Read Sprockets README (https://github.com/sstephenson/sprockets#sprockets-directives) for details
// about supported directives.
//

//= require jquery2
//= require jquery_ujs
//= require jquery.cookie
//= require bootstrap-sprockets
//= require jquery.slick
//= require dropzone

$(".nav a").on("click", function(){
   $(".nav").find(".active").removeClass("active");
   $(this).parent().addClass("active");
});

Update application.js