WB 2.11.0

// Native Javascript for Bootstrap 3 | Dropdown

// by dnp_theme

(function(factory){

  // CommonJS/RequireJS and "native" compatibility

  if(typeof module !== "undefined" && typeof exports == "object") {

    // A commonJS/RequireJS environment

    if(typeof window != "undefined") {

      // Window and document exist, so return the factory's return value.

      module.exports = factory();

    } else {

      // Let the user give the factory a Window and Document.

      module.exports = factory;

    }

  } else {

    // Assume a traditional browser.

    window.Dropdown = factory();

  }

})(function(root){

  // DROPDOWN DEFINITION

  // ===================

  var Dropdown = function( element) {

    this.menu = typeof element === 'object' ? element : document.querySelector(element);

    this.init();

  }

  // DROPDOWN METHODS

  // ================

  Dropdown.prototype = {

    init : function() {

      this.actions();

      this.menu.setAttribute('tabindex', '0'); // Fix onblur on Chrome | Safari

      document.addEventListener('click', this.handle, false);

    },

    actions : function() {

      var self = this;

      this.handle = function(e) { // fix some Safari bug with <button>

        var target = e.target || e.currentTarget,

            children = [], c = self.menu.parentNode.getElementsByTagName('*');

        for ( var i=0, l = c.length||0; i<l; i++) { l && children.push(c[i]); }

        if ( target === self.menu || target.parentNode === self.menu ) {

          self.toggle(e);

        }  else if ( children && children.indexOf(target) > -1  ) {

          return;

        } else { self.close(); }

        /\#$/g.test(target.href) && e.preventDefault();

      }

      this.toggle = function(e) {

        if (/open/.test(this.menu.parentNode.className)) {

          this.close();

          document.removeEventListener('keydown', this.key, false);

        } else {

          this.menu.parentNode.className += ' open';

          this.menu.setAttribute('aria-expanded',true);

          document.addEventListener('keydown', this.key, false);

        }

      }

      this.key = function(e) {

        if (e.which == 27) {self.close();}

      }

      this.close = function() {

        self.menu.parentNode.className = self.menu.parentNode.className.replace(' open','');

        self.menu.setAttribute('aria-expanded',false);

      }

    }

  }

  // DROPDOWN DATA API

  // =================

  var Dropdowns = document.querySelectorAll('[data-toggle=dropdown]'), i = 0, ddl = Dropdowns.length;

  for (i;i<ddl;i++) {

    new Dropdown(Dropdowns[i]);

  }

  return Dropdown;

});