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Here we limit the number of events we want to react on.\n            var scrolledTick = 0;\n            $(window).scroll(function () {\n                scrolledTick++;\n                if ( scrolledTick % 5 === 0) {\n                    scrollReactor.redraw();\n                }\n            });\n\n            // tab naviagtion does not trigger scroll event, so here we fire a scroll event.\n            document.onkeydown = function (e) {\n                e = e || window.event;\n                var charCode = typeof e.which === \"number\" ? e.which : e.keyCode;\n                if (charCode === 9) {\n                    var timer = window.setInterval(function () {\n\n                        scrollReactor.redraw();\n\n                        window.clearInterval(timer);\n                    }, 150);\n                }\n            };\n\n            // if a link in the stickie index is clicked, display that link as the current paragraph\n            $(\"#js-stickybody a\").click(function (e) {\n                $(\"li.currentHeading\").removeClass(\"currentHeading\");\n                $(this).parent().addClass(\"currentHeading\");\n\n                // is the clicked link bookmark the same as the one in the page url?\n                if (window.location.hash === this.hash) {\n                    // then force hashchange event\n                    window.location.hash = '';\n                    window.location.hash = this.hash;\n                    e.preventDefault();\n                }\n            });\n\n            // if a bookmark link is clicked, update view after page has rerendered.\n            window.addEventListener(\"hashchange\", this.redraw);\n\n            // do redraw based on initial page state\n            this.redraw();\n        },\n        redraw: function () {\n            // show/hide asideIndex, based on first section position\n            scrollReactor.handleVisability(scrollReactor.visabilityThreshold);\n\n            // stick or unstick the stickie index.\n            scrollReactor.handleStickieness(scrollReactor.stickieThreshold);\n\n            // set current heading in stickie index\n            scrollReactor.setCurrentLinkInIndex(scrollReactor.currentRegionSpan);\n        },\n        handleVisability: function (visabilityThreshold) {\n            var show = false;\n\n            // we have allready hidden because of scroll to bottom. Should we start showing again?\n            if (this.hiddenByFooterAt !== 0) {\n                var contentBottom = $(\"#content\").get(0).getBoundingClientRect().bottom;\n\n                if (this.hiddenByFooterAt < contentBottom) {\n                    show = true;\n                    this.hiddenByFooterAt = 0;\n                }\n\n            }\n            else {\n                // check if we should show because of scrolling past the first heading\n                var visabilityTriggerDOM = $(\".js-parts ol li:first > div.item-header > h2\").get(0);\n                if (visabilityTriggerDOM !== null) {\n                    var visabilityTriggerRect = visabilityTriggerDOM.getBoundingClientRect();\n                    show = visabilityTriggerRect.top <= visabilityThreshold;\n                }\n\n                // should we hide because of scroll to footer?\n                var indexBottom = $(\"#js-stickybody\").get(0).getBoundingClientRect().bottom;\n                var contentBot = $(\"#content\").get(0).getBoundingClientRect().bottom;\n\n                if (indexBottom > contentBot) {\n                    show = false;\n\n                    // we can't get bottom of hidden elements, so we save the last known bottom posittion for index\n                    this.hiddenByFooterAt = indexBottom;\n                }\n            }\n\n            if (show)\n                $(\"#js-stickybody\").fadeIn();\n            else\n                $(\"#js-stickybody\").fadeOut();\n\n\n        },\n        handleStickieness: function (stickieThreshold) {\n            var topOfStickieTrigger = $(\"#js-sticky\").get(0).getBoundingClientRect().top;\n            if (topOfStickieTrigger <= stickieThreshold)\n                $(\"#js-stickybody\").addClass(\"stickybody\");\n            else\n                $(\"#js-stickybody\").removeClass(\"stickybody\");\n        },\n\n        scrollIntoViewDependingOnDirection: function (element, wrapper) {\n            var elementRect = element.getBoundingClientRect();\n            var wrapperRect = wrapper.getBoundingClientRect();\n\n\n            if (elementRect.bottom > wrapperRect.bottom) {\n                element.scrollIntoView(false);\n            }\n            if (elementRect.top < wrapperRect.top) {\n                element.scrollIntoView();\n            }\n        },\n\n        setCurrentLinkInIndex: function (currentRegionSpan) {\n            var lastId = \"\";\n            var lastTop = -1000000;\n            var headings = $(\".js-parts > ol > li\").toArray();\n            for (var i = 0; i < headings.length; i++) {\n                var itemTop = headings[i].getBoundingClientRect().top;\n                if (itemTop <= currentRegionSpan) {\n\n                    // set corresponding heading to selected in the stickie index\n                    if (itemTop > lastTop) {\n                        lastTop = itemTop;\n                        lastId = headings[i].id;\n                    }\n                }\n                else\n                    break;\n            }\n\n            if (lastId !== \"\") {\n                var currentListItem = $(\"#js-stickybody a[href='#\" + lastId + \"']\").parent();\n\n                if (currentListItem.length > 0 && !currentListItem.hasClass(\"currentHeading\")) {\n                    $(\"li.currentHeading\").removeClass(\"currentHeading\");\n                    currentListItem.addClass(\"currentHeading\");\n\n                    var stickyMenuWrapper = $(\"#js-stickybody\")[0];\n                    this.scrollIntoViewDependingOnDirection(currentListItem[0], stickyMenuWrapper);\n                }\n            }\n            else {\n                $(\"li.currentHeading\").removeClass(\"currentHeading\");\n            }\n        }\n    };\n\n    return scrollReactor;\n});"]}