feat: enhance theme functionality and add social sharing metadata
- Added new UI strings for theme toggle, copy functionality, and navigation. - Implemented dynamic theme color for mobile browsers based on user selection. - Introduced Open Graph and Twitter Card metadata for improved social sharing. - Added JSON-LD structured data for articles to enhance SEO. - Created a new JavaScript file for theme behavior, including theme picker, reading progress bar, back-to-top button, and image lightbox functionality. - Enhanced code blocks with copy-to-clipboard buttons and improved tabbed code block functionality. - Implemented a random navigation order feature and a table of contents generator for articles.
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/* ============================================================
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BLOWDIT — theme behaviour
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Deferred, cacheable bundle of all client-side enhancements.
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Loaded with <script defer> from index.php, so the DOM is fully
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parsed before any of these IIFEs run (no DOMContentLoaded needed).
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NOTE: the anti-flash theme bootstrap stays inline in head.php —
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it must run before the first paint and cannot be deferred.
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============================================================ */
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(function () {
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'use strict';
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// Localised UI strings (overridable via window.BLOWDIT_I18N, set in index.php).
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var I18N = window.BLOWDIT_I18N || {};
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var T = {
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copy: I18N.copy || 'Copy',
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copied: I18N.copied || 'Copied',
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copyCode: I18N.copyCode || 'Copy code',
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backToTop: I18N.backToTop || 'Back to top',
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prevSlide: I18N.prevSlide || 'Previous slide',
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nextSlide: I18N.nextSlide || 'Next slide',
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goToSlide: I18N.goToSlide || 'Go to slide',
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prevImage: I18N.prevImage || 'Previous image',
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nextImage: I18N.nextImage || 'Next image',
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imageViewer: I18N.imageViewer || 'Image viewer'
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};
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/* --------------------------------------------------------
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Theme picker
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-------------------------------------------------------- */
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(function () {
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var STORAGE_KEY = 'blowdit-theme';
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var THEMES = ['light', 'dark', 'nord', 'dracula', 'catppuccin'];
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var ICONS = {
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light: 'bi-brightness-high',
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dark: 'bi-moon-stars',
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nord: 'bi-snow',
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dracula: 'bi-droplet',
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catppuccin: 'bi-cup'
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};
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var root = document.documentElement;
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var btn = document.getElementById('theme-toggle');
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var picker = document.getElementById('theme-picker');
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function syncIcon(theme) {
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if (!btn) return;
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var icon = btn.querySelector('i');
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if (!icon) return;
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icon.className = 'bi ' + (ICONS[theme] || 'bi-circle-half');
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}
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function syncSwatches(theme) {
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if (!picker) return;
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Array.prototype.forEach.call(picker.querySelectorAll('.swatch'), function (s) {
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s.classList.toggle('is-active', s.getAttribute('data-pick') === theme);
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});
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}
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function apply(theme) {
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root.setAttribute('data-theme', theme);
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try { localStorage.setItem(STORAGE_KEY, theme); } catch (e) {}
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document.cookie = 'blowdit-theme=' + theme + '; path=/; max-age=31536000; SameSite=Lax';
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var bg = window.BLOWDIT_THEME_BG || {};
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if (bg[theme]) { root.style.backgroundColor = bg[theme]; }
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root.style.colorScheme = (theme === 'light') ? 'light' : 'dark';
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syncIcon(theme);
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syncSwatches(theme);
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}
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function openPicker() {
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if (!picker) return;
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picker.classList.add('is-open');
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if (btn) btn.setAttribute('aria-expanded', 'true');
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}
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function closePicker() {
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if (!picker) return;
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picker.classList.remove('is-open');
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if (btn) btn.setAttribute('aria-expanded', 'false');
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}
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// Swatch clicks
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if (picker) {
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Array.prototype.forEach.call(picker.querySelectorAll('.swatch'), function (s) {
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s.addEventListener('click', function () {
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apply(s.getAttribute('data-pick'));
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closePicker();
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});
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});
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}
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// Toggle button: open / close picker
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if (btn) {
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btn.addEventListener('click', function (e) {
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e.stopPropagation();
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picker && picker.classList.contains('is-open') ? closePicker() : openPicker();
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});
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}
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// Close on outside click
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document.addEventListener('click', function (e) {
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if (!picker || !picker.classList.contains('is-open')) return;
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if (btn && btn.contains(e.target)) return;
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if (picker.contains(e.target)) return;
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closePicker();
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});
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// Initialise icons + active swatch
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var current = root.getAttribute('data-theme') || 'light';
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if (THEMES.indexOf(current) === -1) current = 'light';
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syncIcon(current);
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syncSwatches(current);
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// Follow OS preference unless the visitor chose explicitly
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if (window.matchMedia) {
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window.matchMedia('(prefers-color-scheme: dark)').addEventListener('change', function (e) {
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try { if (localStorage.getItem(STORAGE_KEY)) return; } catch (err) {}
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apply(e.matches ? 'dark' : 'light');
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});
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}
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})();
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/* --------------------------------------------------------
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Randomise the order of the navigation / pages list on each load
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-------------------------------------------------------- */
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(function () {
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function shuffle(arr) {
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for (var i = arr.length - 1; i > 0; i--) {
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var j = Math.floor(Math.random() * (i + 1));
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var tmp = arr[i]; arr[i] = arr[j]; arr[j] = tmp;
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}
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return arr;
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}
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var lists = document.querySelectorAll('.js-random-nav ul');
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Array.prototype.forEach.call(lists, function (ul) {
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var items = Array.prototype.filter.call(ul.children, function (el) {
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return el.tagName === 'LI';
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});
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shuffle(items).forEach(function (li) { ul.appendChild(li); });
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});
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})();
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/* --------------------------------------------------------
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Table of Contents: generate links from article headings + scroll-spy
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-------------------------------------------------------- */
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(function () {
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var tocNav = document.getElementById('toc-nav');
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if (!tocNav) return;
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var content = document.querySelector('.content');
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if (!content) return;
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var headings = content.querySelectorAll('h2, h3, h4');
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if (headings.length === 0) return;
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// Ensure every heading has a stable anchor ID
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var usedIds = {};
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Array.prototype.forEach.call(headings, function (h) {
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if (!h.id) {
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var base = h.textContent.trim().toLowerCase()
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.replace(/[^a-z0-9\s-]/g, '')
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.replace(/\s+/g, '-')
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.replace(/^-+|-+$/g, '') || 'heading';
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var id = base, n = 2;
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while (usedIds[id]) { id = base + '-' + (n++); }
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usedIds[id] = true;
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h.id = id;
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} else {
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usedIds[h.id] = true;
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}
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});
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// Build the list
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var ul = document.createElement('ul');
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ul.className = 'toc-list';
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Array.prototype.forEach.call(headings, function (h) {
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var li = document.createElement('li');
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li.className = 'toc-item toc-' + h.tagName.toLowerCase();
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var a = document.createElement('a');
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a.href = '#' + h.id;
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a.textContent = h.textContent;
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a.className = 'toc-link';
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li.appendChild(a);
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ul.appendChild(li);
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});
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tocNav.appendChild(ul);
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// Scroll-spy: highlight the last heading that has scrolled past the top
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var headingArr = Array.prototype.slice.call(headings);
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function updateActive() {
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var scrollY = window.scrollY || window.pageYOffset;
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var threshold = scrollY + 120; // offset for navbar height
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var active = null;
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headingArr.forEach(function (h) {
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var top = h.getBoundingClientRect().top + scrollY;
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if (top <= threshold) active = h;
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});
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var links = tocNav.querySelectorAll('.toc-link');
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Array.prototype.forEach.call(links, function (a) { a.classList.remove('active'); });
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if (active) {
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var link = tocNav.querySelector('a[href="#' + active.id + '"]');
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if (link) link.classList.add('active');
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}
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}
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window.addEventListener('scroll', updateActive, { passive: true });
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updateActive();
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})();
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/* --------------------------------------------------------
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Tabbed code blocks: transforms ```tabs fences into a tab UI
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-------------------------------------------------------- */
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(function () {
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var tabGroupSeq = 0;
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// Match both "language-tabs" (Parsedown >= 1.7) and bare "tabs" (older Bludit builds)
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var blocks = document.querySelectorAll(
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'pre > code.language-tabs, pre > code.tabs'
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);
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Array.prototype.forEach.call(blocks, function (code) {
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var pre = code.parentNode;
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var raw = code.textContent;
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// Supports "[Name]" and "@tab Name" as tab headers
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var tabs = [];
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var current = null;
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raw.split('\n').forEach(function (line) {
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line = line.replace(/\r$/, ''); // strip Windows CR
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var m = line.match(/^\[([^\]]+)\]\s*$/) ||
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line.match(/^@tab\s+(.+?)\s*$/);
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if (m) {
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current = { name: m[1], lines: [] };
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tabs.push(current);
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} else if (current) {
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current.lines.push(line);
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}
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});
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if (!tabs.length) return;
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// Trim leading / trailing blank lines from each tab
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tabs.forEach(function (t) {
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while (t.lines.length && !t.lines[0].trim()) t.lines.shift();
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while (t.lines.length && !t.lines[t.lines.length - 1].trim()) t.lines.pop();
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});
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// Build the tab group
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var groupId = 'tabgroup-' + (++tabGroupSeq);
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var group = document.createElement('div');
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group.className = 'tab-group';
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var list = document.createElement('div');
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list.className = 'tab-list';
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list.setAttribute('role', 'tablist');
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group.appendChild(list);
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var panels = [];
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tabs.forEach(function (t, i) {
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var active = (i === 0);
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var tabId = groupId + '-tab-' + i;
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var panelId = groupId + '-panel-' + i;
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// Tab button
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var btn = document.createElement('button');
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btn.type = 'button';
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btn.className = 'tab-btn' + (active ? ' is-active' : '');
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btn.id = tabId;
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btn.setAttribute('role', 'tab');
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btn.setAttribute('aria-selected', active ? 'true' : 'false');
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btn.setAttribute('aria-controls', panelId);
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btn.setAttribute('tabindex', active ? '0' : '-1');
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btn.textContent = t.name;
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list.appendChild(btn);
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// Tab panel
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var panel = document.createElement('div');
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panel.className = 'tab-panel' + (active ? ' is-active' : '');
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panel.id = panelId;
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panel.setAttribute('role', 'tabpanel');
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panel.setAttribute('aria-labelledby', tabId);
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panel.setAttribute('tabindex', '0');
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if (!active) panel.hidden = true;
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var panelPre = document.createElement('pre');
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var panelCode = document.createElement('code');
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panelCode.textContent = t.lines.join('\n');
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panelPre.appendChild(panelCode);
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panel.appendChild(panelPre);
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group.appendChild(panel);
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panels.push({ btn: btn, panel: panel });
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function activate() {
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panels.forEach(function (p) {
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p.btn.classList.remove('is-active');
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p.btn.setAttribute('aria-selected', 'false');
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p.btn.setAttribute('tabindex', '-1');
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p.panel.classList.remove('is-active');
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p.panel.hidden = true;
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});
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btn.classList.add('is-active');
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btn.setAttribute('aria-selected', 'true');
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btn.setAttribute('tabindex', '0');
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panel.classList.add('is-active');
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panel.hidden = false;
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}
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btn.addEventListener('click', activate);
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btn.addEventListener('keydown', function (e) {
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var nextIdx = null;
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if (e.key === 'ArrowRight') nextIdx = (i + 1) % panels.length;
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else if (e.key === 'ArrowLeft') nextIdx = (i - 1 + panels.length) % panels.length;
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if (nextIdx !== null) {
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e.preventDefault();
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panels[nextIdx].btn.click();
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panels[nextIdx].btn.focus();
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}
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});
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});
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pre.parentNode.replaceChild(group, pre);
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});
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})();
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/* --------------------------------------------------------
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Image carousel: transforms ```carousel fences into a slideshow
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-------------------------------------------------------- */
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(function () {
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var blocks = document.querySelectorAll('pre > code.language-carousel');
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Array.prototype.forEach.call(blocks, function (code) {
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var pre = code.parentNode;
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// Accepts "", "url | caption", or bare "url"
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var slides = [];
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code.textContent.split('\n').forEach(function (line) {
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line = line.replace(/\r$/, '').trim();
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if (!line) return;
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// Markdown image syntax: 
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var md = line.match(/^!\[([^\]]*)\]\(([^)]+)\)\s*$/);
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if (md) {
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slides.push({ url: md[2].trim(), caption: md[1].trim() });
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return;
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}
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// Plain: "url | caption" or bare url
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var parts = line.split('|');
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var url = parts[0].trim();
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if (url) slides.push({ url: url, caption: (parts[1] || '').trim() });
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});
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if (!slides.length) return;
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var car = document.createElement('div');
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car.className = 'carousel';
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car.setAttribute('role', 'group');
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car.setAttribute('aria-roledescription', 'carousel');
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var track = document.createElement('div');
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track.className = 'carousel-track';
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car.appendChild(track);
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var slideEls = [];
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var dotEls = [];
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var current = 0;
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slides.forEach(function (s, i) {
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var slide = document.createElement('div');
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slide.className = 'carousel-slide' + (i === 0 ? ' is-active' : '');
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var img = document.createElement('img');
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img.src = s.url;
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img.alt = s.caption;
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img.loading = 'lazy';
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slide.appendChild(img);
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if (s.caption) {
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var cap = document.createElement('p');
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cap.className = 'carousel-caption';
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cap.textContent = s.caption;
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slide.appendChild(cap);
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}
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track.appendChild(slide);
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slideEls.push(slide);
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});
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function goTo(idx) {
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slideEls[current].classList.remove('is-active');
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if (dotEls[current]) dotEls[current].classList.remove('is-active');
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current = (idx + slides.length) % slides.length;
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slideEls[current].classList.add('is-active');
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if (dotEls[current]) dotEls[current].classList.add('is-active');
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}
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if (slides.length > 1) {
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var prev = document.createElement('button');
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prev.type = 'button'; prev.className = 'carousel-arrow carousel-prev';
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prev.setAttribute('aria-label', T.prevSlide);
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prev.textContent = '‹';
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prev.addEventListener('click', function () { goTo(current - 1); });
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car.appendChild(prev);
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var next = document.createElement('button');
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next.type = 'button'; next.className = 'carousel-arrow carousel-next';
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next.setAttribute('aria-label', T.nextSlide);
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next.textContent = '›';
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next.addEventListener('click', function () { goTo(current + 1); });
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car.appendChild(next);
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var dots = document.createElement('div');
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dots.className = 'carousel-dots';
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slides.forEach(function (_, i) {
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var dot = document.createElement('button');
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dot.type = 'button';
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dot.className = 'carousel-dot' + (i === 0 ? ' is-active' : '');
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dot.setAttribute('aria-label', T.goToSlide + ' ' + (i + 1));
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dot.addEventListener('click', function () { goTo(i); });
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dots.appendChild(dot);
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dotEls.push(dot);
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});
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car.appendChild(dots);
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// Swipe support
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var startX = 0;
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track.addEventListener('touchstart', function (e) { startX = e.touches[0].clientX; }, { passive: true });
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track.addEventListener('touchend', function (e) {
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var dx = e.changedTouches[0].clientX - startX;
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if (Math.abs(dx) > 40) goTo(dx < 0 ? current + 1 : current - 1);
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}, { passive: true });
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}
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||||
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||||
pre.parentNode.replaceChild(car, pre);
|
||||
});
|
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})();
|
||||
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||||
/* --------------------------------------------------------
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||||
Lightbox: click any article image to zoom; carousel-aware prev/next
|
||||
-------------------------------------------------------- */
|
||||
(function () {
|
||||
var content = document.querySelector('.content');
|
||||
if (!content) return;
|
||||
|
||||
var images = content.querySelectorAll('img');
|
||||
if (!images.length) return;
|
||||
|
||||
// Build overlay with optional prev/next arrows for carousel galleries
|
||||
var overlay = document.createElement('div');
|
||||
overlay.className = 'lightbox-overlay';
|
||||
overlay.setAttribute('role', 'dialog');
|
||||
overlay.setAttribute('aria-modal', 'true');
|
||||
overlay.setAttribute('aria-label', T.imageViewer);
|
||||
|
||||
var prevBtn = document.createElement('button');
|
||||
prevBtn.type = 'button';
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||||
prevBtn.className = 'lightbox-arrow lightbox-prev';
|
||||
prevBtn.setAttribute('aria-label', T.prevImage);
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||||
prevBtn.textContent = '‹'; // ‹
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||||
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||||
var zoomed = document.createElement('img');
|
||||
|
||||
var nextBtn = document.createElement('button');
|
||||
nextBtn.type = 'button';
|
||||
nextBtn.className = 'lightbox-arrow lightbox-next';
|
||||
nextBtn.setAttribute('aria-label', T.nextImage);
|
||||
nextBtn.textContent = '›'; // ›
|
||||
|
||||
overlay.appendChild(prevBtn);
|
||||
overlay.appendChild(zoomed);
|
||||
overlay.appendChild(nextBtn);
|
||||
document.body.appendChild(overlay);
|
||||
|
||||
var gallery = []; // images in the current carousel (empty = single image)
|
||||
var galIdx = 0;
|
||||
|
||||
function showAt(idx) {
|
||||
galIdx = (idx + gallery.length) % gallery.length;
|
||||
zoomed.src = gallery[galIdx].src;
|
||||
zoomed.alt = gallery[galIdx].alt || '';
|
||||
}
|
||||
|
||||
function open(el) {
|
||||
// If the image lives inside a carousel, collect all slides for navigation
|
||||
var car = el.closest ? el.closest('.carousel') : null;
|
||||
if (car) {
|
||||
gallery = Array.prototype.slice.call(car.querySelectorAll('.carousel-slide img'));
|
||||
galIdx = gallery.indexOf(el);
|
||||
if (galIdx === -1) galIdx = 0;
|
||||
} else {
|
||||
gallery = [el];
|
||||
galIdx = 0;
|
||||
}
|
||||
var hasMultiple = gallery.length > 1;
|
||||
prevBtn.style.display = hasMultiple ? '' : 'none';
|
||||
nextBtn.style.display = hasMultiple ? '' : 'none';
|
||||
zoomed.src = el.src;
|
||||
zoomed.alt = el.alt || '';
|
||||
overlay.classList.add('is-open');
|
||||
document.body.style.overflow = 'hidden';
|
||||
}
|
||||
|
||||
function close() {
|
||||
overlay.classList.remove('is-open');
|
||||
document.body.style.overflow = '';
|
||||
}
|
||||
|
||||
prevBtn.addEventListener('click', function (e) {
|
||||
e.stopPropagation();
|
||||
showAt(galIdx - 1);
|
||||
});
|
||||
nextBtn.addEventListener('click', function (e) {
|
||||
e.stopPropagation();
|
||||
showAt(galIdx + 1);
|
||||
});
|
||||
|
||||
function wrapImage(el) {
|
||||
if (el.naturalWidth > 0 && el.naturalWidth < 100) return;
|
||||
if (el.naturalHeight > 0 && el.naturalHeight < 100) return;
|
||||
var wrap = document.createElement('span');
|
||||
wrap.className = 'zoomable-wrap';
|
||||
el.parentNode.insertBefore(wrap, el);
|
||||
wrap.appendChild(el);
|
||||
el.addEventListener('click', function () { open(el); });
|
||||
}
|
||||
|
||||
Array.prototype.forEach.call(images, function (el) {
|
||||
if (el.complete && el.naturalWidth) {
|
||||
wrapImage(el);
|
||||
} else {
|
||||
el.addEventListener('load', function () { wrapImage(el); });
|
||||
}
|
||||
});
|
||||
|
||||
// Close on backdrop click (not on arrows or image)
|
||||
overlay.addEventListener('click', function (e) {
|
||||
if (e.target === overlay) close();
|
||||
});
|
||||
|
||||
document.addEventListener('keydown', function (e) {
|
||||
if (!overlay.classList.contains('is-open')) return;
|
||||
if (e.key === 'Escape' || e.key === 'Esc') close();
|
||||
if (e.key === 'ArrowLeft' && gallery.length > 1) showAt(galIdx - 1);
|
||||
if (e.key === 'ArrowRight' && gallery.length > 1) showAt(galIdx + 1);
|
||||
});
|
||||
})();
|
||||
|
||||
/* --------------------------------------------------------
|
||||
Copy-to-clipboard buttons on code blocks
|
||||
Runs after the tabs/carousel transforms so it only targets real
|
||||
code blocks (including the generated tab panels), not raw fences.
|
||||
-------------------------------------------------------- */
|
||||
(function () {
|
||||
function copyText(text) {
|
||||
if (navigator.clipboard && navigator.clipboard.writeText) {
|
||||
return navigator.clipboard.writeText(text);
|
||||
}
|
||||
// Fallback for older / non-secure-context browsers
|
||||
return new Promise(function (resolve, reject) {
|
||||
try {
|
||||
var ta = document.createElement('textarea');
|
||||
ta.value = text;
|
||||
ta.style.position = 'fixed';
|
||||
ta.style.opacity = '0';
|
||||
document.body.appendChild(ta);
|
||||
ta.select();
|
||||
document.execCommand('copy');
|
||||
document.body.removeChild(ta);
|
||||
resolve();
|
||||
} catch (e) { reject(e); }
|
||||
});
|
||||
}
|
||||
|
||||
function enhance(pre) {
|
||||
// Skip if already wrapped
|
||||
if (pre.parentNode && pre.parentNode.classList &&
|
||||
pre.parentNode.classList.contains('code-block')) return;
|
||||
|
||||
var wrap = document.createElement('div');
|
||||
wrap.className = 'code-block';
|
||||
pre.parentNode.insertBefore(wrap, pre);
|
||||
wrap.appendChild(pre);
|
||||
|
||||
var btn = document.createElement('button');
|
||||
btn.type = 'button';
|
||||
btn.className = 'code-copy';
|
||||
btn.setAttribute('aria-label', T.copyCode);
|
||||
btn.innerHTML = '<i class="bi bi-clipboard" aria-hidden="true"></i>';
|
||||
|
||||
var resetTimer = null;
|
||||
btn.addEventListener('click', function () {
|
||||
var code = pre.querySelector('code');
|
||||
var text = (code ? code.textContent : pre.textContent) || '';
|
||||
copyText(text).then(function () {
|
||||
btn.classList.add('is-copied');
|
||||
btn.innerHTML = '<i class="bi bi-check-lg" aria-hidden="true"></i>';
|
||||
btn.setAttribute('aria-label', T.copied);
|
||||
clearTimeout(resetTimer);
|
||||
resetTimer = setTimeout(function () {
|
||||
btn.classList.remove('is-copied');
|
||||
btn.innerHTML = '<i class="bi bi-clipboard" aria-hidden="true"></i>';
|
||||
btn.setAttribute('aria-label', T.copyCode);
|
||||
}, 1800);
|
||||
}).catch(function () {});
|
||||
});
|
||||
|
||||
wrap.appendChild(btn);
|
||||
}
|
||||
|
||||
var pres = document.querySelectorAll('.content pre, .tab-panel pre');
|
||||
Array.prototype.forEach.call(pres, enhance);
|
||||
})();
|
||||
|
||||
/* --------------------------------------------------------
|
||||
Reading progress bar — tracks scroll position over the page.
|
||||
Only shown when there's article content to read.
|
||||
-------------------------------------------------------- */
|
||||
(function () {
|
||||
if (!document.querySelector('.content')) return;
|
||||
|
||||
var bar = document.createElement('div');
|
||||
bar.className = 'reading-progress';
|
||||
bar.setAttribute('role', 'progressbar');
|
||||
bar.setAttribute('aria-hidden', 'true');
|
||||
var fill = document.createElement('div');
|
||||
fill.className = 'reading-progress-fill';
|
||||
bar.appendChild(fill);
|
||||
document.body.appendChild(bar);
|
||||
|
||||
var ticking = false;
|
||||
function update() {
|
||||
var h = document.documentElement;
|
||||
var max = h.scrollHeight - h.clientHeight;
|
||||
var pct = max > 0 ? (h.scrollTop / max) * 100 : 0;
|
||||
fill.style.width = pct + '%';
|
||||
ticking = false;
|
||||
}
|
||||
function onScroll() {
|
||||
if (!ticking) {
|
||||
ticking = true;
|
||||
window.requestAnimationFrame(update);
|
||||
}
|
||||
}
|
||||
window.addEventListener('scroll', onScroll, { passive: true });
|
||||
window.addEventListener('resize', onScroll, { passive: true });
|
||||
update();
|
||||
})();
|
||||
|
||||
/* --------------------------------------------------------
|
||||
Back-to-top button — appears after scrolling down.
|
||||
-------------------------------------------------------- */
|
||||
(function () {
|
||||
var btn = document.createElement('button');
|
||||
btn.type = 'button';
|
||||
btn.className = 'back-to-top';
|
||||
btn.setAttribute('aria-label', T.backToTop);
|
||||
btn.innerHTML = '<i class="bi bi-arrow-up" aria-hidden="true"></i>';
|
||||
document.body.appendChild(btn);
|
||||
|
||||
btn.addEventListener('click', function () {
|
||||
var reduce = window.matchMedia &&
|
||||
window.matchMedia('(prefers-reduced-motion: reduce)').matches;
|
||||
window.scrollTo({ top: 0, behavior: reduce ? 'auto' : 'smooth' });
|
||||
});
|
||||
|
||||
var ticking = false;
|
||||
function update() {
|
||||
btn.classList.toggle('is-visible', (window.scrollY || window.pageYOffset) > 400);
|
||||
ticking = false;
|
||||
}
|
||||
window.addEventListener('scroll', function () {
|
||||
if (!ticking) {
|
||||
ticking = true;
|
||||
window.requestAnimationFrame(update);
|
||||
}
|
||||
}, { passive: true });
|
||||
update();
|
||||
})();
|
||||
|
||||
})();
|
||||
Reference in new issue
Block a user