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aMap[idx + 1];\n\n      const adjustedPosition = position;\n      const offset = position + window.innerHeight;\n\n      // if at bottom of page return the last\n      if (offset >= document.documentElement.offsetHeight) {\n        return idx === aMap.length - 1;\n      }\n      // if before first, return first\n      else if (adjustedPosition < aMap[0].offsetTop) {\n        return idx === 0;\n      }\n      // if inbetween return it\n      else if (next) {\n        return a.offsetTop <= adjustedPosition && adjustedPosition < next.offsetTop;\n      }\n      // otherwise return the last\n      return idx === aMap.length - 1;\n    });\n    return anchor;\n  };\n\n  const setActiveAnchor = (position) => {\n    $(\".topic-list-nav li.active\").removeClass(\"active\").children(\"a\").removeAttr(\"aria-current\");\n\n    const anchorHref = findActiveAnchor(position).selector;\n\n    const anchor = $navAnchors.toArray().find((a) => a.getAttribute(\"href\") === anchorHref);\n\n    $(anchor).closest(\"li\").addClass(\"active\");\n    $(anchor).attr('aria-current', 'true');\n  };\n\n  return {\n    onScroll: setActiveAnchor\n  };\n}\n\nexport function scrollSidePanel() {\n  const unitContentContainer = $(\".unit-content-container\");\n  const unitHeading = $(\".th-content-unit-heading\")[0];\n  const contextNav = document.getElementById(\"contextnav\");\n  const alert = document.querySelector(\"th-alert\");\n  const padding = 10;\n  let alertHeight = 0;\n  if (alert) {\n    alertHeight = alert.offsetHeight;\n  }\n  if (!unitContentContainer[0] || !unitHeading) {\n    return;\n  }\n  const unitHeadingHeight = unitHeading.offsetHeight;\n\n  const setSidePanelContentHeight = () => {\n    if (unitContentContainer) {\n      const contextNavOffset = contextNav.offsetTop + contextNav.offsetHeight;\n      unitContentContainer.css({\n        height: `calc(100vh - ${unitHeadingHeight + padding + alertHeight}px - ${contextNavOffset}px)`\n      });\n    }\n  }\n\n  return {\n    onScroll: setSidePanelContentHeight\n  }\n}\n\nexport function unitPageOnScroll() {\n  const stickyNav = stickyTopicNav();\n  const scrollSpy = scrollSpyTopicNav();\n  const sticky = stickyBreadcrumb();\n  const sidePanel = scrollSidePanel();\n\n  const onScroll = () => {\n    const currentPosition = window.pageYOffset || document.documentElement.scrollTop;\n\n    try {\n      if (sticky) {\n        sticky.onScroll(currentPosition);\n      }\n      if (stickyNav) {\n        stickyNav.onScroll(currentPosition);\n      }\n      if (scrollSpy) {\n        scrollSpy.onScroll(currentPosition);\n      }\n      if (sidePanel) {\n        sidePanel.onScroll();\n      }\n    } catch (e) {\n      console.warn(\"topic nav error\", e);\n    }\n  };\n\n  return {\n    onScroll\n  };\n}\n\nexport default function unitPage() {\n  const init = () => {\n    try {\n      smoothTopicNav();\n      // unitPageOnScroll().onScroll();\n      const sidePanel = scrollSidePanel();\n\n      if(sidePanel) {\n        scrollSidePanel().onScroll();\n      }\n    } catch (e) {\n      console.warn(\"could not initialize topic nav\", e);\n    }\n  };\n\n  return {\n    init,\n    onScroll: unitPageOnScroll().onScroll\n  };\n}\n\n$(() => {\n  const page = unitPage();\n  page.init();\n\n  $(window).on(\"scroll\", page.onScroll);\n  $(window).on(\"scrollend\", page.onScroll);\n\n  $(window).on(\"resize\", page.onScroll);\n\n  if (isDesktop()) {\n    const unitContent = document.querySelector(\".th-unit-content\");\n    if (unitContent) {\n      unitContent.classList.add('desktop');\n    }\n  }\n});\n"],"sourceRoot":""}