navbar dropdown for Haml

_navdropdown.html.haml

 %nav.navbar.navbar-default{role: "navigation"}
      / Brand and toggle get grouped for better mobile display
      .navbar-header
        %button.navbar-toggle{"data-target" => ".navbar-ex1-collapse", "data-toggle" => "collapse", type: "button"}
          %span.sr-only Toggle navigation
          %span.icon-bar
          %span.icon-bar
          %span.icon-bar
        %a.navbar-brand{href: "#"} Brand
      / Collect the nav links, forms, and other content for toggling
      .collapse.navbar-collapse.navbar-ex1-collapse
        %ul.nav.navbar-nav
          %li.active
            %a{href: "#"} Link
          %li
            %a{href: "#"} Link
          %li.dropdown
            %a.dropdown-toggle{"data-toggle" => "dropdown", href: "#"}
              Dropdown
              %b.caret
            %ul.dropdown-menu
              %li
                %a{href: "#"} Action
              %li
                %a{href: "#"} Another action
              %li
                %a{href: "#"} Something else here
              %li
                %a{href: "#"} Separated link
              %li
                %a{href: "#"} One more separated link
        %form.navbar-form.navbar-left{role: "search"}
          .form-group
            %input.form-control{placeholder: "Search", type: "text"}/
          %button.btn.btn-default{type: "submit"} Submit
        %ul.nav.navbar-nav.navbar-right
          %li
            %a{href: "#"} Link
          %li.dropdown
            %a.dropdown-toggle{"data-toggle" => "dropdown", href: "#"}
              Dropdown
              %b.caret
            %ul.dropdown-menu
              %li
                %a{href: "#"} Action
              %li
                %a{href: "#"} Another action
              %li
                %a{href: "#"} Something else here
              %li
                %a{href: "#"} Separated link
      / /.navbar-collapse