|
1 | 1 | <style type="text/css" media="screen"> |
2 | | -.post-menu ul { |
3 | | - list-style: none; |
4 | | - padding: 0; |
5 | | - margin: 0; |
6 | | -} |
| 2 | + .post-menu ul { |
| 3 | + list-style: none; |
| 4 | + padding: 0; |
| 5 | + margin: 0; |
| 6 | + } |
7 | 7 | </style> |
8 | 8 |
|
9 | 9 | <div class="post-menu"> |
10 | | - <div class="post-menu-title">Table of content</div> |
11 | | - <div class="post-menu-content"></div> |
| 10 | + <div class="post-menu-title">Table of content</div> |
| 11 | + <div class="post-menu-content"></div> |
12 | 12 | </div> |
13 | 13 |
|
14 | 14 | <script> |
15 | | - function generateContent() { |
16 | | - var menu = document.querySelector(".post-menu"); |
17 | | - var menuContent = menu.querySelector(".post-menu-content"); |
18 | | - var headings = document.querySelector(".post-content").querySelectorAll("h2, h3"); |
| 15 | + function generateContent() { |
| 16 | + var menu = document.querySelector(".post-menu"); |
| 17 | + var menuContent = menu.querySelector(".post-menu-content"); |
| 18 | + var headings = document.querySelector(".post-content").querySelectorAll("h2, h3"); |
19 | 19 |
|
20 | | - // Hide menu when no headings |
21 | | - if (headings.length === 0) { |
22 | | - return menu.style.display = "none"; |
23 | | - } |
| 20 | + // Hide menu when no headings |
| 21 | + if (headings.length === 0) { |
| 22 | + return menu.style.visibility = "hidden"; |
| 23 | + } |
24 | 24 |
|
25 | | - // Generate post menu |
26 | | - var menuHTML = ''; |
27 | | - for (var i = 0; i < headings.length; i++) { |
28 | | - var h = headings[i]; |
29 | | - menuHTML += ( |
30 | | - '<li class="h-5">' |
31 | | - + '<a href="#h-' + h.getAttribute('id') + '">' + h.textContent + '</a></li>'); |
32 | | - } |
| 25 | + // Generate post menu |
| 26 | + var menuHTML = ''; |
| 27 | + for (var i = 0; i < headings.length; i++) { |
| 28 | + var h = headings[i]; |
| 29 | + menuHTML += ( |
| 30 | + '<li class="h-5">' |
| 31 | + + '<a href="#h-' + h.getAttribute('id') + '">' + h.textContent + '</a></li>'); |
| 32 | + } |
33 | 33 |
|
34 | | - menuContent.innerHTML = '<ul>' + menuHTML + '</ul>'; |
| 34 | + menuContent.innerHTML = '<ul>' + menuHTML + '</ul>'; |
35 | 35 |
|
36 | | - // The header element |
37 | | - var header = document.querySelector('header.site-header'); |
| 36 | + // The header element |
| 37 | + var header = document.querySelector('header.site-header'); |
38 | 38 |
|
39 | | - function doMenuCollapse(index, over_items) { |
40 | | - var items = menuContent.firstChild.children; |
| 39 | + function doMenuCollapse(index, over_items) { |
| 40 | + var items = menuContent.firstChild.children; |
41 | 41 |
|
42 | | - if (over_items == undefined) { |
43 | | - over_items = 20; |
44 | | - } |
| 42 | + if (over_items == undefined) { |
| 43 | + over_items = 20; |
| 44 | + } |
45 | 45 |
|
46 | | - if (items.length < over_items) { |
47 | | - return; |
48 | | - } |
| 46 | + if (items.length < over_items) { |
| 47 | + return; |
| 48 | + } |
49 | 49 |
|
50 | | - var activeItem = items[index]; |
51 | | - var beginItem = activeItem |
52 | | - var endItem = activeItem |
53 | | - var beginIndex = index; |
54 | | - var endIndex = index + 1; |
55 | | - while (beginIndex >= 0 |
56 | | - && !items[beginIndex].classList.contains('h-h2')) { |
57 | | - beginIndex -= 1; |
58 | | - } |
59 | | - while (endIndex < items.length |
60 | | - && !items[endIndex].classList.contains('h-h2')) { |
61 | | - endIndex += 1; |
62 | | - } |
63 | | - for (var i = 0; i < beginIndex; i++) { |
64 | | - item = items[i] |
65 | | - if (!item.classList.contains('h-h2')) { |
66 | | - item.style.display = 'none'; |
| 50 | + var activeItem = items[index]; |
| 51 | + var beginItem = activeItem |
| 52 | + var endItem = activeItem |
| 53 | + var beginIndex = index; |
| 54 | + var endIndex = index + 1; |
| 55 | + while (beginIndex >= 0 |
| 56 | + && !items[beginIndex].classList.contains('h-h2')) { |
| 57 | + beginIndex -= 1; |
| 58 | + } |
| 59 | + while (endIndex < items.length |
| 60 | + && !items[endIndex].classList.contains('h-h2')) { |
| 61 | + endIndex += 1; |
| 62 | + } |
| 63 | + for (var i = 0; i < beginIndex; i++) { |
| 64 | + item = items[i] |
| 65 | + if (!item.classList.contains('h-h2')) { |
| 66 | + item.style.display = 'none'; |
| 67 | + } |
| 68 | + } |
| 69 | + for (var i = beginIndex + 1; i < endIndex; i++) { |
| 70 | + item = items[i] |
| 71 | + // if (!item.classList.contains('h-h2')) { |
| 72 | + item.style.display = ''; |
| 73 | + // } |
| 74 | + } |
| 75 | + for (var i = endIndex; i < items.length; i++) { |
| 76 | + item = items[i] |
| 77 | + if (!item.classList.contains('h-h2')) { |
| 78 | + item.style.display = 'none'; |
| 79 | + } |
| 80 | + } |
67 | 81 | } |
68 | | - } |
69 | | - for (var i = beginIndex + 1; i < endIndex; i++) { |
70 | | - item = items[i] |
71 | | - // if (!item.classList.contains('h-h2')) { |
72 | | - item.style.display = ''; |
73 | | - // } |
74 | | - } |
75 | | - for (var i = endIndex; i < items.length; i++) { |
76 | | - item = items[i] |
77 | | - if (!item.classList.contains('h-h2')) { |
78 | | - item.style.display = 'none'; |
79 | | - } |
80 | | - } |
81 | | - } |
82 | 82 |
|
83 | | - // Init menu collapsed |
84 | | - doMenuCollapse(-1); |
| 83 | + // Init menu collapsed |
| 84 | + doMenuCollapse(-1); |
85 | 85 |
|
86 | | - // Active the menu item |
87 | | - window.addEventListener('scroll', function (event) { |
88 | | - var lastActive = menuContent.querySelector('.active'); |
89 | | - var changed = true; |
90 | | - var activeIndex = -1; |
91 | | - for (var i = headings.length - 1; i >= 0; i--) { |
92 | | - var h = headings[i]; |
93 | | - var headingRect = h.getBoundingClientRect(); |
94 | | - var headerRect = header.getBoundingClientRect(); |
95 | | - var headerTop = Math.floor(headerRect.top); |
96 | | - var headerHeight = Math.floor(headerRect.height); |
97 | | - var headerHeight = headerTop + headerHeight + 20; |
98 | | - if (headingRect.top <= headerHeight) { |
99 | | - var id = 'h-' + h.getAttribute('id'); |
100 | | - var a = menuContent.querySelector('a[href="#' + id + '"]'); |
101 | | - var curActive = a.parentNode; |
102 | | - if (curActive) { |
103 | | - curActive.classList.add('active'); |
104 | | - activeIndex = i; |
105 | | - } |
106 | | - if (lastActive == curActive) { |
107 | | - changed = false; |
108 | | - } |
109 | | - break; |
110 | | - } |
111 | | - } |
112 | | - if (changed) { |
113 | | - if (lastActive) { |
114 | | - lastActive.classList.remove('active'); |
115 | | - } |
116 | | - doMenuCollapse(activeIndex); |
117 | | - } |
118 | | - event.preventDefault(); |
119 | | - }); |
120 | | - } |
121 | | - generateContent(); |
| 86 | + // Active the menu item |
| 87 | + window.addEventListener('scroll', function (event) { |
| 88 | + var lastActive = menuContent.querySelector('.active'); |
| 89 | + var changed = true; |
| 90 | + var activeIndex = -1; |
| 91 | + for (var i = headings.length - 1; i >= 0; i--) { |
| 92 | + var h = headings[i]; |
| 93 | + var headingRect = h.getBoundingClientRect(); |
| 94 | + var headerRect = header.getBoundingClientRect(); |
| 95 | + var headerTop = Math.floor(headerRect.top); |
| 96 | + var headerHeight = Math.floor(headerRect.height); |
| 97 | + var headerHeight = headerTop + headerHeight + 20; |
| 98 | + if (headingRect.top <= headerHeight) { |
| 99 | + var id = 'h-' + h.getAttribute('id'); |
| 100 | + var a = menuContent.querySelector('a[href="#' + id + '"]'); |
| 101 | + var curActive = a.parentNode; |
| 102 | + if (curActive) { |
| 103 | + curActive.classList.add('active'); |
| 104 | + activeIndex = i; |
| 105 | + } |
| 106 | + if (lastActive == curActive) { |
| 107 | + changed = false; |
| 108 | + } |
| 109 | + break; |
| 110 | + } |
| 111 | + } |
| 112 | + if (changed) { |
| 113 | + if (lastActive) { |
| 114 | + lastActive.classList.remove('active'); |
| 115 | + } |
| 116 | + doMenuCollapse(activeIndex); |
| 117 | + } |
| 118 | + event.preventDefault(); |
| 119 | + }); |
| 120 | + } |
| 121 | + generateContent(); |
122 | 122 | </script> |
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