improvement

source/js/main.js

@@ -2,18 +2,25 @@ document.addEventListener('DOMContentLoaded', () => {
   let headerContentWidth, $nav
   let mobileSidebarOpen = false
 
+  // rightsideScrollPercent
+  let goUpElement = null
+  let scrollPercentElement = null
+
   const adjustMenu = init => {
-    const getAllWidth = ele => Array.from(ele).reduce((width, i) => width + i.offsetWidth, 0)
+    let hideMenuIndex = false
 
     if (init) {
-      const blogInfoWidth = getAllWidth(document.querySelector('#blog-info > a').children)
-      const menusWidth = getAllWidth(document.getElementById('menus').children)
+      const blogInfoWidth = Array.from(document.querySelector('#blog-info > a').children).reduce((w, i) => w + i.offsetWidth, 0)
+      const menusWidth = Array.from(document.getElementById('menus').children).reduce((w, i) => w + i.offsetWidth, 0)
       headerContentWidth = blogInfoWidth + menusWidth
       $nav = document.getElementById('nav')
     }
 
-    const hideMenuIndex = window.innerWidth <= 768 || headerContentWidth > $nav.offsetWidth - 120
-    $nav.classList.toggle('hide-menu', hideMenuIndex)
+    hideMenuIndex = window.innerWidth <= 768 || headerContentWidth > $nav.offsetWidth - 120
+
+    requestAnimationFrame(() => {
+      $nav.classList.toggle('hide-menu', hideMenuIndex)
+    })
   }
 
   // 初始化header
@@ -54,7 +61,7 @@ document.addEventListener('DOMContentLoaded', () => {
    * 代碼
    * 只適用於Hexo默認的代碼渲染
    */
-  const addHighlightTool = () => {
+  const addHighlightTool = $article => {
     const highLight = GLOBAL_CONFIG.highlight
     if (!highLight) return
 
@@ -64,8 +71,8 @@ document.addEventListener('DOMContentLoaded', () => {
     const isNotHighlightJs = plugin !== 'highlight.js'
     const isPrismjs = plugin === 'prismjs'
     const $figureHighlight = isNotHighlightJs
-      ? Array.from(document.querySelectorAll('code[class*="language-"]')).map(code => code.parentElement)
-      : document.querySelectorAll('figure.highlight')
+      ? Array.from($article.querySelectorAll('code[class*="language-"]')).map(code => code.parentElement)
+      : $article.querySelectorAll('figure.highlight')
 
     if (!((isShowTool || highlightHeightLimit) && $figureHighlight.length)) return
 
@@ -167,33 +174,23 @@ document.addEventListener('DOMContentLoaded', () => {
     // 獲取隱藏狀態下元素的真實高度
     const getActualHeight = item => {
       if (item.offsetHeight > 0) return item.offsetHeight
-      const hiddenElements = new Map()
 
-      const fix = () => {
-        let current = item
-        while (current !== document.body && current != null) {
-          if (window.getComputedStyle(current).display === 'none') {
-            hiddenElements.set(current, current.getAttribute('style') || '')
-          }
-          current = current.parentNode
-        }
+      const clone = item.cloneNode(true)
 
-        const style = 'visibility: hidden !important; display: block !important;'
-        hiddenElements.forEach((originalStyle, elem) => {
-          elem.setAttribute('style', originalStyle ? originalStyle + ';' + style : style)
-        })
-      }
+      clone.style.cssText = `
+        position: absolute !important;
+        visibility: hidden !important;
+        display: block !important;
+        left: 0 !important;
+        top: 0 !important;
+        pointer-events: none !important;
+        z-index: -1 !important;
+        margin: 0 !important;
+      `
 
-      const restore = () => {
-        hiddenElements.forEach((originalStyle, elem) => {
-          if (originalStyle === '') elem.removeAttribute('style')
-          else elem.setAttribute('style', originalStyle)
-        })
-      }
-
-      fix()
-      const height = item.offsetHeight
-      restore()
+      item.parentNode.insertBefore(clone, item)
+      const height = clone.offsetHeight
+      clone.remove()
       return height
     }
 
@@ -244,9 +241,9 @@ document.addEventListener('DOMContentLoaded', () => {
   /**
    * PhotoFigcaption
    */
-  const addPhotoFigcaption = () => {
+  const addPhotoFigcaption = $article => {
     if (!GLOBAL_CONFIG.isPhotoFigcaption) return
-    document.querySelectorAll('#article-container img').forEach(item => {
+    $article.querySelectorAll('img').forEach(item => {
       const altValue = item.title || item.alt
       if (!altValue) return
       const ele = document.createElement('div')
@@ -259,8 +256,8 @@ document.addEventListener('DOMContentLoaded', () => {
   /**
    * Lightbox
    */
-  const runLightbox = () => {
-    btf.loadLightbox(document.querySelectorAll('#article-container img:not(.no-lightbox)'))
+  const runLightbox = $article => {
+    btf.loadLightbox($article.querySelectorAll('img:not(.no-lightbox)'))
   }
 
   /**
@@ -424,11 +421,11 @@ document.addEventListener('DOMContentLoaded', () => {
    */
   const rightsideScrollPercent = currentTop => {
     const scrollPercent = btf.getScrollPercent(currentTop, document.body)
-    const goUpElement = document.getElementById('go-up')
 
+    if (!goUpElement || !scrollPercentElement) return
     if (scrollPercent < 95) {
       goUpElement.classList.add('show-percent')
-      goUpElement.querySelector('.scroll-percent').textContent = scrollPercent
+      scrollPercentElement.textContent = scrollPercent
     } else {
       goUpElement.classList.remove('show-percent')
     }
@@ -465,7 +462,7 @@ document.addEventListener('DOMContentLoaded', () => {
     }
 
     let flag = ''
-    const scrollTask = btf.throttle(() => {
+    const scrollTask = btf.rafThrottle(() => {
       const currentTop = window.scrollY || document.documentElement.scrollTop
       const isDown = scrollDirection(currentTop)
       if (currentTop > 56) {
@@ -497,18 +494,17 @@ document.addEventListener('DOMContentLoaded', () => {
 
       isShowPercent && rightsideScrollPercent(currentTop)
       checkDocumentHeight()
-    }, 300)
+    })
 
     btf.addEventListenerPjax(window, 'scroll', scrollTask, { passive: true })
   }
 
   /**
-  * toc,anchor
+  * toc, anchor
   */
-  const scrollFnToDo = () => {
+  const scrollFnToDo = $article => {
     const isToc = GLOBAL_CONFIG_SITE.isToc
     const isAnchor = GLOBAL_CONFIG.isAnchor
-    const $article = document.getElementById('article-container')
 
     if (!($article && (isToc || isAnchor))) return
 
@@ -521,7 +517,6 @@ document.addEventListener('DOMContentLoaded', () => {
       $tocPercentage = $cardTocLayout.querySelector('.toc-percentage')
       isExpand = $cardToc.classList.contains('is-expand')
 
-      // toc元素點擊
       const tocItemClickFn = e => {
         const target = e.target.closest('.toc-link')
         if (!target) return
@@ -548,86 +543,90 @@ document.addEventListener('DOMContentLoaded', () => {
         }
       }
 
-      // 處理 hexo-blog-encrypt 事件
       $cardToc.style.display = 'block'
     }
 
-    // find head position & add active class
     const $articleList = $article.querySelectorAll('h1,h2,h3,h4,h5,h6')
-    let detectItem = ''
+    if (!$articleList.length) return
 
-    // Optimization: Cache header positions
-    let headerList = []
-    const updateHeaderPositions = () => {
-      headerList = Array.from($articleList).map(ele => ({
-        ele,
-        top: btf.getEleTop(ele),
-        id: ele.id
-      }))
-    }
+    let activeTocItem = null
+    let activeParentItems = []
 
-    updateHeaderPositions()
-    const throttledUpdate = btf.throttle(updateHeaderPositions, 200)
-    btf.addEventListenerPjax(window, 'resize', throttledUpdate)
+    const updateTocUI = currentId => {
+      const encodedAnchor = currentId ? '#' + encodeURI(decodeURI(currentId)) : ''
+      if (isAnchor) btf.updateAnchor(encodedAnchor)
 
-    if ('ResizeObserver' in window) {
-      const observer = new ResizeObserver(throttledUpdate)
-      observer.observe($article)
-      btf.addGlobalFn('pjaxSendOnce', () => { observer.disconnect() })
-    }
+      if (!isToc) return
 
-    const findHeadPosition = top => {
-      if (top === 0) return false
+      if (activeTocItem) activeTocItem.classList.remove('active')
+      activeParentItems.forEach(i => i.classList.remove('active'))
+      activeParentItems = []
 
-      let currentId = ''
-      let currentIndex = ''
-
-      for (let i = 0; i < headerList.length; i++) {
-        const item = headerList[i]
-        if (top > item.top - 80) {
-          currentId = item.id ? '#' + encodeURI(item.id) : ''
-          currentIndex = i
-        } else {
-          break
-        }
+      if (!currentId) {
+        activeTocItem = null
+        return
       }
 
-      if (detectItem === currentIndex) return
+      const targetLink = Array.from($tocLink).find(link => {
+        const href = link.getAttribute('href')
+        if (!href) return false
+        return decodeURI(href).replace('#', '') === decodeURI(currentId)
+      })
 
-      if (isAnchor) btf.updateAnchor(currentId)
+      if (!targetLink) return
 
-      detectItem = currentIndex
+      targetLink.classList.add('active')
+      activeTocItem = targetLink
+      setTimeout(() => autoScrollToc(targetLink), 0)
 
-      if (isToc) {
-        $cardToc.querySelectorAll('.active').forEach(i => i.classList.remove('active'))
-
-        if (currentId) {
-          const currentActive = $tocLink[currentIndex]
-          currentActive.classList.add('active')
-
-          setTimeout(() => autoScrollToc(currentActive), 0)
-
-          if (!isExpand) {
-            let parent = currentActive.parentNode
-            while (!parent.matches('.toc')) {
-              if (parent.matches('li')) parent.classList.add('active')
-              parent = parent.parentNode
-            }
+      if (!isExpand) {
+        let parent = targetLink.parentNode
+        while (!parent.matches('.toc')) {
+          if (parent.matches('li')) {
+            parent.classList.add('active')
+            activeParentItems.push(parent)
           }
+          parent = parent.parentNode
         }
       }
     }
 
-    // main of scroll
-    const tocScrollFn = btf.throttle(() => {
+    const observerOptions = {
+      root: null,
+      rootMargin: '-60px 0px -80% 0px',
+      threshold: 0
+    }
+
+    const observer = new IntersectionObserver(entries => {
+      entries.forEach(entry => {
+        if (entry.isIntersecting) {
+          updateTocUI(entry.target.id)
+        }
+      })
+    }, observerOptions)
+
+    $articleList.forEach(ele => observer.observe(ele))
+
+    const scrollHandler = btf.rafThrottle(() => {
       const currentTop = window.scrollY || document.documentElement.scrollTop
+
       if (isToc && GLOBAL_CONFIG.percent.toc) {
         $tocPercentage.textContent = btf.getScrollPercent(currentTop, $article)
       }
-      findHeadPosition(currentTop)
-    }, 100)
 
-    btf.addEventListenerPjax(window, 'scroll', tocScrollFn, { passive: true })
+      if (currentTop === 0) {
+        updateTocUI('')
+      } else if (currentTop + window.innerHeight >= document.documentElement.scrollHeight - 10) {
+        const lastHeader = $articleList[$articleList.length - 1]
+        updateTocUI(lastHeader.id)
+      }
+    })
+
+    btf.addEventListenerPjax(window, 'scroll', scrollHandler, { passive: true })
+
+    btf.addGlobalFn('pjaxSendOnce', () => {
+      observer.disconnect()
+    })
   }
 
   const handleThemeChange = mode => {
@@ -804,8 +803,8 @@ document.addEventListener('DOMContentLoaded', () => {
   /**
    * table overflow
    */
-  const addTableWrap = () => {
-    const $table = document.querySelectorAll('#article-container table')
+  const addTableWrap = $article => {
+    const $table = $article.querySelectorAll('table')
     if (!$table.length) return
 
     $table.forEach(item => {
@@ -815,52 +814,54 @@ document.addEventListener('DOMContentLoaded', () => {
     })
   }
 
-  /**
-   * tag-hide
-   */
-  const clickFnOfTagHide = () => {
-    const hideButtons = document.querySelectorAll('#article-container .hide-button')
+  const clickFnOfTagHide = $article => {
+    const hideButtons = $article.querySelectorAll('.hide-button')
     if (!hideButtons.length) return
-    hideButtons.forEach(item => item.addEventListener('click', e => {
-      const currentTarget = e.currentTarget
-      currentTarget.classList.add('open')
-      addJustifiedGallery(currentTarget.nextElementSibling.querySelectorAll('.gallery-container'))
-    }, { once: true }))
+
+    const handleClickOfTagHide = e => {
+      const button = e.target.closest('.hide-button')
+      if (!button) return
+      button.classList.add('open')
+      addJustifiedGallery(button.nextElementSibling.querySelectorAll('.gallery-container'))
+    }
+
+    btf.addEventListenerPjax($article, 'click', handleClickOfTagHide)
   }
 
-  const tabsFn = () => {
-    const navTabsElements = document.querySelectorAll('#article-container .tabs')
-    if (!navTabsElements.length) return
+  const tabsFn = $article => {
+    if (!$article.querySelector('.tabs')) return
 
     const setActiveClass = (elements, activeIndex) => {
-      elements.forEach((el, index) => {
-        el.classList.toggle('active', index === activeIndex)
-      })
+      elements.forEach((el, index) => el.classList.toggle('active', index === activeIndex))
     }
 
-    const handleNavClick = e => {
-      const target = e.target.closest('button')
-      if (!target || target.classList.contains('active')) return
+    const handleClick = e => {
+      const tabsRoot = e.target.closest('.tabs')
+      if (!tabsRoot) return
 
-      const navItems = [...e.currentTarget.children]
-      const tabContents = [...e.currentTarget.nextElementSibling.children]
-      const indexOfButton = navItems.indexOf(target)
-      setActiveClass(navItems, indexOfButton)
-      e.currentTarget.classList.remove('no-default')
-      setActiveClass(tabContents, indexOfButton)
-      addJustifiedGallery(tabContents[indexOfButton].querySelectorAll('.gallery-container'), true)
-    }
+      const navContainer = tabsRoot.firstElementChild
+      const toTopContainer = tabsRoot.lastElementChild
 
-    const handleToTopClick = tabElement => e => {
-      if (e.target.closest('button')) {
-        btf.scrollToDest(btf.getEleTop(tabElement), 300)
+      if (navContainer.contains(e.target)) {
+        const target = e.target.closest('button')
+        if (!target || target.classList.contains('active')) return
+
+        const navItems = [...navContainer.children]
+        const tabContents = [...navContainer.nextElementSibling.children]
+        const indexOfButton = navItems.indexOf(target)
+        setActiveClass(navItems, indexOfButton)
+        navContainer.classList.remove('no-default')
+        setActiveClass(tabContents, indexOfButton)
+        addJustifiedGallery(tabContents[indexOfButton].querySelectorAll('.gallery-container'), true)
+        return
+      }
+
+      if (toTopContainer.contains(e.target) && e.target.closest('button')) {
+        btf.scrollToDest(btf.getEleTop(tabsRoot), 300)
       }
     }
 
-    navTabsElements.forEach(tabElement => {
-      btf.addEventListenerPjax(tabElement.firstElementChild, 'click', handleNavClick)
-      btf.addEventListenerPjax(tabElement.lastElementChild, 'click', handleToTopClick(tabElement))
-    })
+    btf.addEventListenerPjax($article, 'click', handleClick)
   }
 
   const toggleCardCategory = () => {
@@ -926,10 +927,13 @@ document.addEventListener('DOMContentLoaded', () => {
   }
 
   const unRefreshFn = () => {
-    window.addEventListener('resize', () => {
+    const resizeHandler = btf.rafThrottle(() => {
       adjustMenu(false)
-      mobileSidebarOpen && btf.isHidden(document.getElementById('toggle-menu')) && sidebarFn.close()
+      if (mobileSidebarOpen && btf.isHidden(document.getElementById('toggle-menu'))) {
+        sidebarFn.close()
+      }
     })
+    window.addEventListener('resize', resizeHandler, { passive: true })
 
     const menuMask = document.getElementById('menu-mask')
     menuMask && menuMask.addEventListener('click', () => { sidebarFn.close() })
@@ -947,18 +951,24 @@ document.addEventListener('DOMContentLoaded', () => {
   }
 
   const forPostFn = () => {
-    addHighlightTool()
-    addPhotoFigcaption()
-    addJustifiedGallery(document.querySelectorAll('#article-container .gallery-container'))
-    runLightbox()
-    scrollFnToDo()
-    addTableWrap()
-    clickFnOfTagHide()
-    tabsFn()
+    const $article = document.getElementById('article-container')
+    if (!$article) return
+
+    addHighlightTool($article)
+    addPhotoFigcaption($article)
+    addJustifiedGallery($article.querySelectorAll('.gallery-container'))
+    runLightbox($article)
+    scrollFnToDo($article)
+    addTableWrap($article)
+    clickFnOfTagHide($article)
+    tabsFn($article)
   }
 
   const refreshFn = () => {
     initAdjust()
+    goUpElement = document.getElementById('go-up')
+    scrollPercentElement = goUpElement?.querySelector('.scroll-percent')
+
     justifiedIndexPostUI()
 
     if (GLOBAL_CONFIG_SITE.pageType === 'post') {