jQuery plugin for a custom megamenu. Found from the depths of my Dropbox

bmm-megamenu.js

/**
* @version 0.1 Alpha
* @author Timo Laak 7/6/2013
*
*/
(function($) {
    /**
    * Constants for recurring use
    */
    var constants = {
        /** @const */
        PLUGIN_NAME: 'bmmMegamenu',
        /** @const */
        ACTIVE_PARENT_CLASS: 'active',
        /** @const */
        ACTIVE_NODE_CLASS: 'node-active',
        /** @const */
        ACTIVE_SHEET_CLASS: 'sheet-active',
        /** @const */
        BTN_TOGGLE_CLASS: 'btn-toggle-node',
        /** @const */
        PLUGIN_NAME_CLASS: 'bmm-megamenu'
    };

    /**
    * Templates for repeating elements
    */
    var templates = {
        toggleButton: '<i class="' + constants.BTN_TOGGLE_CLASS +'"></i>'
    };

    var helpers = {
        isTouch: function() {
            if (window.navigator.msMaxTouchPoints) {
                return true;
            }
            if (typeof Modernizr === "object" && Modernizr.touch) {
                return true;
            }
            return false;
        }
    };


    /**
    * Plugin methods
    */
    var methods = {
        init: function(options) {
            if (!this.data('navigationDomBackup')) {
                this.data('navigationDomBackup', this.html());
            }

            // Check the requested layout and destroy & build only if it's not yet active
            if (options.layout === 'sheet' && this.data('layout') !== 'sheet') {
                methods.destroyTree.apply(this);
                methods.restore.apply(this);
                methods.buildSheet.apply(this);
            } else if (options.layout === 'tree' && this.data('layout') !== 'tree') {
                methods.destroySheet.apply(this);
                methods.restore.apply(this);
                methods.buildTree.apply(this);
            }
            return this;
        },
        buildTree: function () {
            this.addClass(constants.PLUGIN_NAME_CLASS);
            this.data('initialized', 'true');
            this.hide();
            var root = this.children('ul');
            var nodes = root.find('ul');
            for (var x = 0, length = nodes.length; x < length; x++) {
                var node = new Node(nodes[x], this);
                if (node.isActive()) {
                    node.toggle();
                }
            }
            // Set the active layout
            this.data('layout', 'tree');
            return this;
        },
        buildSheet: function () {
            this.show();
            this.addClass(constants.PLUGIN_NAME_CLASS);
            this.data('initialized', 'true');
            var topLevel = this.children('ul').children('li'), timerOutId;

            topLevel.on('mouseenter.topLevel touchstart', function (event) {
                var _this = this;
                // Disable main level link click events on touchstart
                if (event.type === "touchstart") {
                    topLevel.children('a').click(function(event) {
                        event.stopPropagation();
                        event.preventDefault();
                    });
                }
                // Add short timeout to prevent accidental opening of menu
                timerOutId = setTimeout(function() {
                    $(_this).addClass(constants.ACTIVE_SHEET_CLASS);
                    $(_this).siblings().removeClass(constants.ACTIVE_SHEET_CLASS);
                }, 300);

            });
            topLevel.on('mouseleave.topLevel', function(event) {
                clearTimeout(timerOutId);
            });
            topLevel.children('ul').each(function() {
                /* Note! IE10 on Win8 tablets is buggy and fires up
                mouseout event when you click inside the menu */
               $(this).on('mouseleave.sheet', function() {
                    if (!helpers.isTouch()) {
                        $(this).parent().removeClass(constants.ACTIVE_SHEET_CLASS);
                    }
               });
            });

            $('html').on('click touchstart', function (event) {
                var _target = $(event.target);

                if (!_target.closest('.'+constants.ACTIVE_SHEET_CLASS).length) {
                    _target.removeClass(constants.ACTIVE_SHEET_CLASS);
                    topLevel.removeClass(constants.ACTIVE_SHEET_CLASS);
                }
            });
            this.data('layout', 'sheet');

            var promoContainer = $('.has-promo > ul', this);
            var sectionNormal = promoContainer.children('li').not('.is-references, .promo');
            var sectionReferences = promoContainer.children('li.is-references');
            var sectionPromo = promoContainer.children('li.promo');

            promoContainer.prepend(
                $('<li class="sections bmm-megamenu-sections"></li>')
                    .append($('<ul class="normal bmm-megamenu-normal"></ul>')
                        .append(sectionNormal)
                    )
            );

            $('.sections', promoContainer).append(
                $('<ul class="references"></ul>')
                    .append(sectionReferences)
            );
            return this;
        },
        destroyTree: function() {
            // Don't try to destroy a layout which is not active
            if (this.data('layout') === 'sheet') {
                return this;
            }
            // Find all toggle buttons
            var toggleButtons = $('.'+constants.BTN_TOGGLE_CLASS);
            // Remove event bindings
            toggleButtons.off('.toggle');
            // Remove buttons
            toggleButtons.remove();
            // Remove plugin class name from tree
            this.removeClass(constants.PLUGIN_NAME_CLASS);
            // Remove data attribute
            this.removeData('initialized');
            this.removeData('layout');
            return this;
        },
        destroySheet: function() {
            var topLevel = this.children('ul').children('li');
            topLevel.off('.topLevel');
            this.removeData('initialized');
            this.removeData('layout');
            return this;
        },
        restore: function() {
            var navigationDomBackup = this.data('navigationDomBackup');
            this.html(navigationDomBackup);
            return this;
        }
    };

    /**
    * Node
    * @constructor
    */
    var Node = function Node(root, _this) {
        this.root = root;
        this.parent = $(root).parent();
        this.visible = true;
        this.toggleButton = $(templates.toggleButton);
        this.toggleButton.on('click.toggle', null, null, function() {
            $(this).toggleClass(constants.ACTIVE_NODE_CLASS);
            $(this).nextAll('ul').attr('style', '');
            $(this).nextAll('ul').removeAttr('style');
        });
        this.parent.prepend(this.toggleButton);
    };

    /**
    *   Add methods for Node object
    */
    Node.prototype = {
        /**
        * Returns true if node parent element (li) has css class indicating its child element is the current page
        */
        isActive: function isActive() {
            return this.parent.hasClass(constants.ACTIVE_PARENT_CLASS);
        },
        /**
        * Returns the count of elements in this node
        */
        length: function length() {
            return this.children('li').length;
        },
        /**
        * Toggles node visibility
        */
        toggle: function toggle() {
            this.visible = !this.visible;
            this.toggleButton.toggleClass(constants.ACTIVE_NODE_CLASS);
        }
    };

    /**
    * The actual plugin
    */
    $.fn[constants.PLUGIN_NAME] = function(method) {
        if ( methods[method] ) {
            return methods[method].apply( this, Array.prototype.slice.call( arguments, 1 ));
        } else if ( typeof method === 'object' || ! method ) {
            return methods.init.apply( this, arguments );
        } else {
            $.error( 'Method ' +  method + ' does not exist on bmmMegamenu' );
        }

        /**
        * Custom settings
        */
        var settings = $.extend( {

        });
    };
})(jQuery);