Bootstrap navbar toggle not working

Question

Using the code below, I am trying to create a responsive web layout that, when the screen size is reduced, displays the navigation button and a page navigation page appears on the selection screen. I am sure that the toggle button is displayed, however when clicked nothing happens. I looked at various Bootstrap examples and cannot indicate why my error is. Any help would be appreciated.

<nav class="navbar navbar-inverse navbar-fixed-top"> <div class="container"> <div class="navbar-header"> <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#navbar" aria-expanded="false" aria-controls="navbar"> <span class="sr-only">Toggle navigation</span> <span class="icon-bar"</span> <span class="icon-bar"></span> <span class="icon-bar"></span> <span class="icon-bar"></span> </button> <div id="navbar" class="navbar-collapse collapse"> <ul class="nav navbar-nav"> <li class="active"><a href="#">Home</a></li> <li><a href="#about">About</a></li> <li><a href="#contact">Contact</a></li> <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-expanded="false">Dropdown <span class="caret"></span></a> <ul class="dropdown-menu" role="menu"> <li><a href="#">Action</a></li> <li><a href="#">Another action</a></li> <li><a href="#">Something else here</a></li> <li class="divider"></li> <li class="dropdown-header">Nav header</li> <li><a href="#">Separated link</a></li> <li><a href="#">One more separated link</a></li> </ul> </li> </ul> <ul class="nav navbar-nav navbar-right"> <li><a href="../navbar/">Default</a></li> <li><a href="../navbar-static-top/">Static top</a></li> <li class="active"><a href="./">Fixed top <span class="sr-only">(current)</span></a></li> </ul> </div><!--/.nav-collapse --> </div> </nav> 

Answer 1

You probably are not including the necessary resources (javascript files).

try adding these lines to your code

in the header section of the html page add:

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/css/bootstrap.min.css "> 

Before closing the body tag, add this:

  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.4/js/bootstrap.min.js"></script>