foreground/assets/scripts/foundation/foundation.dropdown.js

;(function ($, window, document, undefined) {
  'use strict';

  Foundation.libs.dropdown = {
    name : 'dropdown',

    version : '5.5.3',

    settings : {
      active_class : 'open',
      disabled_class : 'disabled',
      mega_class : 'mega',
      align : 'bottom',
      is_hover : false,
      hover_timeout : 150,
      opened : function () {},
      closed : function () {}
    },

    init : function (scope, method, options) {
      Foundation.inherit(this, 'throttle');

      $.extend(true, this.settings, method, options);
      this.bindings(method, options);
    },

    events : function (scope) {
      var self = this,
          S = self.S;

      S(this.scope)
        .off('.dropdown')
        .on('click.fndtn.dropdown', '[' + this.attr_name() + ']', function (e) {
          var settings = S(this).data(self.attr_name(true) + '-init') || self.settings;
          if (!settings.is_hover || Modernizr.touch) {
            e.preventDefault();
            if (S(this).parent('[data-reveal-id]').length) {
              e.stopPropagation();
            }
            self.toggle($(this));
          }
        })
        .on('mouseenter.fndtn.dropdown', '[' + this.attr_name() + '], [' + this.attr_name() + '-content]', function (e) {
          var $this = S(this),
              dropdown,
              target;

          clearTimeout(self.timeout);

          if ($this.data(self.data_attr())) {
            dropdown = S('#' + $this.data(self.data_attr()));
            target = $this;
          } else {
            dropdown = $this;
            target = S('[' + self.attr_name() + '="' + dropdown.attr('id') + '"]');
          }

          var settings = target.data(self.attr_name(true) + '-init') || self.settings;

          if (S(e.currentTarget).data(self.data_attr()) && settings.is_hover) {
            self.closeall.call(self);
          }

          if (settings.is_hover) {
            self.open.apply(self, [dropdown, target]);
          }
        })
        .on('mouseleave.fndtn.dropdown', '[' + this.attr_name() + '], [' + this.attr_name() + '-content]', function (e) {
          var $this = S(this);
          var settings;

          if ($this.data(self.data_attr())) {
              settings = $this.data(self.data_attr(true) + '-init') || self.settings;
          } else {
              var target   = S('[' + self.attr_name() + '="' + S(this).attr('id') + '"]'),
                  settings = target.data(self.attr_name(true) + '-init') || self.settings;
          }

          self.timeout = setTimeout(function () {
            if ($this.data(self.data_attr())) {
              if (settings.is_hover) {
                self.close.call(self, S('#' + $this.data(self.data_attr())));
              }
            } else {
              if (settings.is_hover) {
                self.close.call(self, $this);
              }
            }
          }.bind(this), settings.hover_timeout);
        })
        .on('click.fndtn.dropdown', function (e) {
          var parent = S(e.target).closest('[' + self.attr_name() + '-content]');
          var links  = parent.find('a');

          if (links.length > 0 && parent.attr('aria-autoclose') !== 'false') {
              self.close.call(self, S('[' + self.attr_name() + '-content]'));
          }

          if (e.target !== document && !$.contains(document.documentElement, e.target)) {
            return;
          }

          if (S(e.target).closest('[' + self.attr_name() + ']').length > 0) {
            return;
          }

          if (!(S(e.target).data('revealId')) &&
            (parent.length > 0 && (S(e.target).is('[' + self.attr_name() + '-content]') ||
              $.contains(parent.first()[0], e.target)))) {
            e.stopPropagation();
            return;
          }

          self.close.call(self, S('[' + self.attr_name() + '-content]'));
        })
        .on('opened.fndtn.dropdown', '[' + self.attr_name() + '-content]', function () {
          self.settings.opened.call(this);
        })
        .on('closed.fndtn.dropdown', '[' + self.attr_name() + '-content]', function () {
          self.settings.closed.call(this);
        });

      S(window)
        .off('.dropdown')
        .on('resize.fndtn.dropdown', self.throttle(function () {
          self.resize.call(self);
        }, 50));

      this.resize();
    },

    close : function (dropdown) {
      var self = this;
      dropdown.each(function (idx) {
        var original_target = $('[' + self.attr_name() + '=' + dropdown[idx].id + ']') || $('aria-controls=' + dropdown[idx].id + ']');
        original_target.attr('aria-expanded', 'false');
        if (self.S(this).hasClass(self.settings.active_class)) {
          self.S(this)
            .css(Foundation.rtl ? 'right' : 'left', '-99999px')
            .attr('aria-hidden', 'true')
            .removeClass(self.settings.active_class)
            .prev('[' + self.attr_name() + ']')
            .removeClass(self.settings.active_class)
            .removeData('target');

          self.S(this).trigger('closed.fndtn.dropdown', [dropdown]);
        }
      });
      dropdown.removeClass('f-open-' + this.attr_name(true));
    },

    closeall : function () {
      var self = this;
      $.each(self.S('.f-open-' + this.attr_name(true)), function () {
        self.close.call(self, self.S(this));
      });
    },

    open : function (dropdown, target) {
      this
        .css(dropdown
        .addClass(this.settings.active_class), target);
      dropdown.prev('[' + this.attr_name() + ']').addClass(this.settings.active_class);
      dropdown.data('target', target.get(0)).trigger('opened.fndtn.dropdown', [dropdown, target]);
      dropdown.attr('aria-hidden', 'false');
      target.attr('aria-expanded', 'true');
      dropdown.focus();
      dropdown.addClass('f-open-' + this.attr_name(true));
    },

    data_attr : function () {
      if (this.namespace.length > 0) {
        return this.namespace + '-' + this.name;
      }

      return this.name;
    },

    toggle : function (target) {
      if (target.hasClass(this.settings.disabled_class)) {
        return;
      }
      var dropdown = this.S('#' + target.data(this.data_attr()));
      if (dropdown.length === 0) {
        // No dropdown found, not continuing
        return;
      }

      this.close.call(this, this.S('[' + this.attr_name() + '-content]').not(dropdown));

      if (dropdown.hasClass(this.settings.active_class)) {
        this.close.call(this, dropdown);
        if (dropdown.data('target') !== target.get(0)) {
          this.open.call(this, dropdown, target);
        }
      } else {
        this.open.call(this, dropdown, target);
      }
    },

    resize : function () {
      var dropdown = this.S('[' + this.attr_name() + '-content].open');
      var target = $(dropdown.data("target"));

      if (dropdown.length && target.length) {
        this.css(dropdown, target);
      }
    },

    css : function (dropdown, target) {
      var left_offset = Math.max((target.width() - dropdown.width()) / 2, 8),
          settings = target.data(this.attr_name(true) + '-init') || this.settings,
          parentOverflow = dropdown.parent().css('overflow-y') || dropdown.parent().css('overflow');

      this.clear_idx();



      if (this.small()) {
        var p = this.dirs.bottom.call(dropdown, target, settings);

        dropdown.attr('style', '').removeClass('drop-left drop-right drop-top').css({
          position : 'absolute',
          width : '95%',
          'max-width' : 'none',
          top : p.top
        });

        dropdown.css(Foundation.rtl ? 'right' : 'left', left_offset);
      }
      // detect if dropdown is in an overflow container
      else if (parentOverflow !== 'visible') {
        var offset = target[0].offsetTop + target[0].offsetHeight;

        dropdown.attr('style', '').css({
          position : 'absolute',
          top : offset
        });

        dropdown.css(Foundation.rtl ? 'right' : 'left', left_offset);
      }
      else {

        this.style(dropdown, target, settings);
      }

      return dropdown;
    },

    style : function (dropdown, target, settings) {
      var css = $.extend({position : 'absolute'},
        this.dirs[settings.align].call(dropdown, target, settings));

      dropdown.attr('style', '').css(css);
    },

    // return CSS property object
    // `this` is the dropdown
    dirs : {
      // Calculate target offset
      _base : function (t, s) {
        var o_p = this.offsetParent(),
            o = o_p.offset(),
            p = t.offset();

        p.top -= o.top;
        p.left -= o.left;

        //set some flags on the p object to pass along
        p.missRight = false;
        p.missTop = false;
        p.missLeft = false;
        p.leftRightFlag = false;

        //lets see if the panel will be off the screen
        //get the actual width of the page and store it
        var actualBodyWidth;
        var windowWidth = window.innerWidth;
        
        if (document.getElementsByClassName('row')[0]) {
          actualBodyWidth = document.getElementsByClassName('row')[0].clientWidth;
        } else {
          actualBodyWidth = windowWidth;
        }

        var actualMarginWidth = (windowWidth - actualBodyWidth) / 2;
        var actualBoundary = actualBodyWidth;

        if (!this.hasClass('mega') && !s.ignore_repositioning) {
          var outerWidth = this.outerWidth();
          var o_left = t.offset().left;
		  
          //miss top
          if (t.offset().top <= this.outerHeight()) {
            p.missTop = true;
            actualBoundary = windowWidth - actualMarginWidth;
            p.leftRightFlag = true;
          }

          //miss right
          if (o_left + outerWidth > o_left + actualMarginWidth && o_left - actualMarginWidth > outerWidth) {
            p.missRight = true;
            p.missLeft = false;
          }

          //miss left
          if (o_left - outerWidth <= 0) {
            p.missLeft = true;
            p.missRight = false;
          }
        }

        return p;
      },

      top : function (t, s) {
        var self = Foundation.libs.dropdown,
            p = self.dirs._base.call(this, t, s);

        this.addClass('drop-top');

        if (p.missTop == true) {
          p.top = p.top + t.outerHeight() + this.outerHeight();
          this.removeClass('drop-top');
        }

        if (p.missRight == true) {
          p.left = p.left - this.outerWidth() + t.outerWidth();
        }

        if (t.outerWidth() < this.outerWidth() || self.small() || this.hasClass(s.mega_menu)) {
          self.adjust_pip(this, t, s, p);
        }

        if (Foundation.rtl) {
          return {left : p.left - this.outerWidth() + t.outerWidth(),
            top : p.top - this.outerHeight()};
        }

        return {left : p.left, top : p.top - this.outerHeight()};
      },

      bottom : function (t, s) {
        var self = Foundation.libs.dropdown,
            p = self.dirs._base.call(this, t, s);

        if (p.missRight == true) {
          p.left = p.left - this.outerWidth() + t.outerWidth();
        }

        if (t.outerWidth() < this.outerWidth() || self.small() || this.hasClass(s.mega_menu)) {
          self.adjust_pip(this, t, s, p);
        }

        if (self.rtl) {
          return {left : p.left - this.outerWidth() + t.outerWidth(), top : p.top + t.outerHeight()};
        }

        return {left : p.left, top : p.top + t.outerHeight()};
      },

      left : function (t, s) {
        var p = Foundation.libs.dropdown.dirs._base.call(this, t, s);

        this.addClass('drop-left');

        if (p.missLeft == true) {
          p.left =  p.left + this.outerWidth();
          p.top = p.top + t.outerHeight();
          this.removeClass('drop-left');
        }

        return {left : p.left - this.outerWidth(), top : p.top};
      },

      right : function (t, s) {
        var p = Foundation.libs.dropdown.dirs._base.call(this, t, s);

        this.addClass('drop-right');

        if (p.missRight == true) {
          p.left = p.left - this.outerWidth();
          p.top = p.top + t.outerHeight();
          this.removeClass('drop-right');
        } else {
          p.triggeredRight = true;
        }

        var self = Foundation.libs.dropdown;

        if (t.outerWidth() < this.outerWidth() || self.small() || this.hasClass(s.mega_menu)) {
          self.adjust_pip(this, t, s, p);
        }

        return {left : p.left + t.outerWidth(), top : p.top};
      }
    },

    // Insert rule to style psuedo elements
    adjust_pip : function (dropdown, target, settings, position) {
      var sheet = Foundation.stylesheet,
          pip_offset_base = 8;

      if (dropdown.hasClass(settings.mega_class)) {
        pip_offset_base = position.left + (target.outerWidth() / 2) - 8;
      } else if (this.small()) {
        pip_offset_base += position.left - 8;
      }

      this.rule_idx = sheet.cssRules.length;

      //default
      var sel_before = '.f-dropdown.open:before',
          sel_after  = '.f-dropdown.open:after',
          css_before = 'left: ' + pip_offset_base + 'px;',
          css_after  = 'left: ' + (pip_offset_base - 1) + 'px;';

      if (position.missRight == true) {
        pip_offset_base = dropdown.outerWidth() - 23;
        sel_before = '.f-dropdown.open:before',
        sel_after  = '.f-dropdown.open:after',
        css_before = 'left: ' + pip_offset_base + 'px;',
        css_after  = 'left: ' + (pip_offset_base - 1) + 'px;';
      }

      //just a case where right is fired, but its not missing right
      if (position.triggeredRight == true) {
        sel_before = '.f-dropdown.open:before',
        sel_after  = '.f-dropdown.open:after',
        css_before = 'left:-12px;',
        css_after  = 'left:-14px;';
      }

      if (sheet.insertRule) {
        sheet.insertRule([sel_before, '{', css_before, '}'].join(' '), this.rule_idx);
        sheet.insertRule([sel_after, '{', css_after, '}'].join(' '), this.rule_idx + 1);
      } else {
        sheet.addRule(sel_before, css_before, this.rule_idx);
        sheet.addRule(sel_after, css_after, this.rule_idx + 1);
      }
    },

    // Remove old dropdown rule index
    clear_idx : function () {
      var sheet = Foundation.stylesheet;

      if (typeof this.rule_idx !== 'undefined') {
        sheet.deleteRule(this.rule_idx);
        sheet.deleteRule(this.rule_idx);
        delete this.rule_idx;
      }
    },

    small : function () {
      return matchMedia(Foundation.media_queries.small).matches &&
        !matchMedia(Foundation.media_queries.medium).matches;
    },

    off : function () {
      this.S(this.scope).off('.fndtn.dropdown');
      this.S('html, body').off('.fndtn.dropdown');
      this.S(window).off('.fndtn.dropdown');
      this.S('[data-dropdown-content]').off('.fndtn.dropdown');
    },

    reflow : function () {}
  };
}(jQuery, window, window.document));