function onHashChange()

in antora-ui-camel/src/js/01-nav.js [53:89]
33 lines of code
15 McCabe index (conditional complexity)

  function onHashChange () {
    var navLink
    var hash = window.location.hash
    if (hash) {
      if (hash.indexOf('%')) hash = decodeURIComponent(hash)
      navLink = menuPanel.querySelector('.nav-link[href="' + hash + '"]')
      if (!navLink) {
        var targetNode = document.getElementById(hash.slice(1))
        if (targetNode) {
          var current = targetNode
          var ceiling = document.querySelector('article.doc')
          while ((current = current.parentNode) && current !== ceiling) {
            var id = current.id
            // NOTE: look for section heading
            if (!id && (id = current.className.match(SECT_CLASS_RX))) id = (current.firstElementChild || {}).id
            if (id && (navLink = menuPanel.querySelector('.nav-link[href="#' + id + '"]'))) break
          }
        }
      }
    }
    var navItem
    if (navLink) {
      navItem = navLink.parentNode
    } else if (originalPageItem) {
      navLink = (navItem = originalPageItem).querySelector('.nav-link')
    } else {
      return
    }
    if (navItem === currentPageItem) return
    find(menuPanel, '.nav-item.is-active').forEach(function (el) {
      el.classList.remove('is-active', 'is-current-path', 'is-current-page')
    })
    navItem.classList.add('is-current-page')
    currentPageItem = navItem
    activateCurrentPath(navItem)
    scrollItemToMidpoint(menuPanel, navLink)
  }