forked from mirror/MrDoc
240 lines
8.4 KiB
JavaScript
240 lines
8.4 KiB
JavaScript
(function () {
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'use strict';
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var toc_cnt = $(".markdown-toc-list").children().length;
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if(toc_cnt > 0){
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// console.log('显示文档目录')
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$(".tocMenu").show();
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initSidebar('.sidebar', '.doc-content');
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}
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})();
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/**
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* 左侧目录生成插件
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* 代码参考了 https://github.com/vuejs/vuejs.org/blob/master/themes/vue/source/js/common.js
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* @param {string} sidebarQuery - 目录 Element 的 query 字符串
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* @param {string} contentQuery - 正文 Element 的 query 字符串
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*/
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function initSidebar(sidebarQuery, contentQuery) {
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addAllStyle();
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var sidebar = document.querySelector(sidebarQuery)
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// 遍历文章中的所有 h1或 h2(取决于最大的 h 是多大) , 编辑为li.h3插入 ul
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var allHeaders = []
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var content = document.querySelector(contentQuery)
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for(var i = 1;i < 7; i++){
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//console.log(i,content.querySelectorAll('h' + i))
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allHeaders.push.apply(allHeaders,content.querySelectorAll('h' + i))
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}
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// console.log('目录列表：',allHeaders)
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//增加 click 点击处理,使用 scrollIntoView,增加控制滚动的 flag
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var scrollFlag = 0
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var scrollFlagTimer
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sidebar.addEventListener('click', function (e) {
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e.preventDefault()
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if (e.target.href) {
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scrollFlag = 1
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clearTimeout(scrollFlagTimer)
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scrollFlagTimer = setTimeout(() => scrollFlag = 0, 1500)
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setActive(e.target, sidebar)
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var target = document.getElementById(e.target.getAttribute('href').slice(1))
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//console.log(e,target)
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//console.log(e.target.getAttribute('href').slice(1))
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target.scrollIntoView({ behavior: 'smooth', block: "start" })
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}
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});
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//监听窗口的滚动和缩放事件
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//window.addEventListener('scroll', updateSidebar)
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//window.addEventListener('resize', throttle(updateSidebar))
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function updateSidebar() {
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if (scrollFlag) return // 如果存在scrollFlag，直接返回
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var doc = document.documentElement // 定义doc变量值为页面文档元素
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var top = doc && doc.scrollTop || document.body.scrollTop // 获取当前页面滚动条纵坐标
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if (!allHeaders.length) return // 如果allHeaders的列表长度为空，直接返回
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var last // 定义一个变量last
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// 按照allHeaders的列表长度进行遍历
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for (var i = 0; i < allHeaders.length; i++) {
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var link = allHeaders[i] // 按索引取出一个目录link
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console.log("滚动条高度",top,document.body.clientHeight)
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// link.offsetTop 表示元素距离上方的距离
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// top 表示当前页面滚动条的纵坐标
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// document.body.clientHeight 表示页面可视区域高度
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// if (link.offsetTop > (top + document.body.clientHeight / 2 - 73)) {
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if (link.offsetTop > (top + document.body.clientHeight / 6)) {
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if (!last) { last = link }
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break
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} else {
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last = link
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}
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}
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if (last) {
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console.log(last.offsetTop)
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setActive(last.id, sidebar)
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}
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}
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}
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/**
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*设置目录的激活状态,按既定规则添加 active 和 current 类
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*>无论对h2还是 h3进行操作,首先都要移除所有的 active 和 current 类, 然后对 h2添加 active 和 current, 或对 h3添加 active 对其父目录添加 current
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@param {String|HTMLElement} id - HTML标题节点或 querySelector 字符串
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@param {HTMLElement} sidebar - 边栏的 HTML 节点
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*/
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function setActive(id, sidebar) {
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//1.无论对h2还是 h3进行操作,首先都要移除所有的 active 和 current 类
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// 遍历目录中所有包含active类的HTMl元素，移除其active类
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var previousActives = sidebar.querySelectorAll(`.active`)
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;[].forEach.call(previousActives, function (h) {
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h.classList.remove('active')
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})
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// 遍历目录中所有包含current类的HTML元素，移除其current类
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previousActives = sidebar.querySelectorAll(`.current`)
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;[].forEach.call(previousActives, function (h) {
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h.classList.remove('current')
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})
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//获取要操作的目录节点
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var currentActive = typeof id === 'string'
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? sidebar.querySelector('a[href="#' + id + '"]')
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: id
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//console.log(currentActive)
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// h2标题
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if (currentActive.classList.contains('h2') != -1) {
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// 添加 active 和 current
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currentActive.classList.add('active', 'current')
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}
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// h3标题
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if ([].indexOf.call(currentActive.classList, 'h3') != -1) {
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console.log("H3标题")
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// 添加 active 且对其父目录添加 current
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currentActive.classList.add('active')
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var parent = currentActive
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while (parent && parent.tagName != 'UL') {
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parent = parent.parentNode
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}
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parent.parentNode.querySelector('.h2-link').classList.add('current', 'active')
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}
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//左侧目录太长时的效果
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currentActive.scrollIntoView({ behavior: 'smooth' })
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}
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/**
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>增加 sidebar 需要的全部样式
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@param {string} highlightColor - 高亮颜色, 默认为'#c7254e'
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*/
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function addAllStyle(highlightColor) {
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highlightColor = highlightColor || "#c7254e"
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var sheet = newStyleSheet()
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/**
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>创建一个新的`<style></style>`标签插入`<head>`中
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@return {Object} style.sheet,`它具有方法insertRule`
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*/
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function newStyleSheet() {
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var style = document.createElement("style");
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// 对WebKit hack :(
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style.appendChild(document.createTextNode(""));
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// 将 <style> 元素加到页面中
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document.head.appendChild(style);
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return style.sheet;
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}
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var position = 0
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/**
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>添加一条 css 规则
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@param {string} str - css样式,也可以是@media
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*/
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function addStyle(str) {
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sheet.insertRule(str,position++);
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}
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addStyle(`.sidebar{position:fixed; z-index: 10;
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top: 50px;
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right: 5px;
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bottom: 0;
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overflow-x: auto;
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overflow-y: auto;
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padding: 20px 20px 20px 20px;
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max-width: 250px;
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background-color:white;
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border-left:2px solid #dddddd;
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}`)
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addStyle(`.menu-root { list-style:none; text-align:left }`)
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addStyle(`.menu-root .h1-link{
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display:inline-block;
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color:rgb(44, 62, 80);
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font-family:"source sans pro", "helvetica neue", Arial, sans-serif;
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font-size:17.55px;
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font-weight:600;
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height:22px;
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line-height:22.5px;
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list-style-type:none;
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margin-block-end:11px;
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margin-block-start:11px;
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}`)
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addStyle(`.menu-root .h2-link:hover {
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border-bottom: 2px solid ${highlightColor};
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}`)
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addStyle(`.menu-root .h2-link.current+.menu-sub{
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display:block;
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}`)
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addStyle(`.menu-root .h2-link{
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color:rgb(127,140,141);
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cursor:pointer;
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font-family:"source sans pro", "helvetica neue", Arial, sans-serif;
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font-size:15px;
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height:auto;
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line-height:22.5px;
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list-style-type:none;
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text-align:left;
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text-decoration-color:rgb(127, 140, 141);
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text-decoration-line:none;
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text-decoration-style:solid;
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margin-left:12.5px;
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}`)
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addStyle(`.menu-sub {
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padding-left:25px;
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list-style:none;
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display:none;
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}`)
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addStyle(`.menu-sub .h3-link{
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color:#333333;
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cursor:pointer;
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display:inline;
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font-family:"source sans pro", "helvetica neue", Arial, sans-serif;
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font-size:12.75px;
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height:auto;
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line-height:19.125px;
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list-style-type:none;
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text-align:left;
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text-decoration-color:rgb(52, 73, 94);
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text-decoration-line:none;
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text-decoration-style:solid;
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}`)
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addStyle(`@media only screen and (max-width : 1300px){
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.content-with-sidebar {
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margin-left:310px !important;
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}
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}`)
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addStyle(`.sidebar .active{
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color:${highlightColor};
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font-weight:700;
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}`)
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}
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/**
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>函数节流
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>参考https://juejin.im/entry/58c0379e44d9040068dc952f
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@param {Fuction} fn - 要执行的函数
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*/
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function throttle(fn, interval = 300) {
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let canRun = true;
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return function () {
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if (!canRun) return;
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canRun = false;
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setTimeout(() => {
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fn.apply(this, arguments);
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canRun = true;
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}, interval);
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};
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} |