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(function () { |
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/* ── typography CSS-var helper ──────────────────────────── */ |
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var _typoKeys = { |
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family:'font-family', weight:'font-weight', style:'font-style', |
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decoration:'text-decoration', transform:'text-transform', |
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sizeDesktop:'font-size-d', sizeTablet:'font-size-t', sizeMobile:'font-size-m', |
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lineHeightDesktop:'line-height-d', lineHeightTablet:'line-height-t', lineHeightMobile:'line-height-m', |
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letterSpacingDesktop:'letter-spacing-d', letterSpacingTablet:'letter-spacing-t', letterSpacingMobile:'letter-spacing-m', |
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wordSpacingDesktop:'word-spacing-d', wordSpacingTablet:'word-spacing-t', wordSpacingMobile:'word-spacing-m' |
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}; |
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function typoCssVarsForEl(el, obj, prefix) { |
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if (!obj || typeof obj !== 'object') return; |
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Object.keys(_typoKeys).forEach(function (k) { |
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var v = obj[k]; |
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if (v === undefined || v === '' || v === null) return; |
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if (k === 'sizeDesktop' || k === 'sizeTablet' || k === 'sizeMobile') v = v + (obj.sizeUnit || 'px'); |
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else if (k === 'lineHeightDesktop' || k === 'lineHeightTablet' || k === 'lineHeightMobile') v = v + (obj.lineHeightUnit || ''); |
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else if (k === 'letterSpacingDesktop' || k === 'letterSpacingTablet' || k === 'letterSpacingMobile') v = v + (obj.letterSpacingUnit || 'px'); |
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else if (k === 'wordSpacingDesktop' || k === 'wordSpacingTablet' || k === 'wordSpacingMobile') v = v + (obj.wordSpacingUnit || 'px'); |
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el.style.setProperty(prefix + _typoKeys[k], String(v)); |
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}); |
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} |
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|
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function init() { |
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document.querySelectorAll('.bkbg-sty-app').forEach(function (appEl) { |
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if (appEl.dataset.rendered) return; |
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appEl.dataset.rendered = '1'; |
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var opts; |
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try { opts = JSON.parse(appEl.dataset.opts || '{}'); } catch (e) { opts = {}; } |
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var o = Object.assign({ |
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chapters: [], defaultBgUrl: '', |
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stickyHeight: '70vh', textPosition: 'left', |
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showProgress: true, transitionStyle: 'fade', panelWidth: 420, |
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eyebrowColor: '#a5b4fc', titleColor: '#ffffff', textColor: '#e5e7eb', |
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textBg: '', progressColor: '#6366f1', accentColor: '#6366f1', |
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paddingTop: 0, paddingBottom: 0 |
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}, opts); |
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|
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var chapters = o.chapters || []; |
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if (!chapters.length) { appEl.style.display = 'none'; return; } |
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|
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function mk(tag, cls, style) { |
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var n = document.createElement(tag); |
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if (cls) n.className = cls; |
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if (style) Object.assign(n.style, style); |
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return n; |
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} |
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|
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/* Section wrapper */ |
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var section = mk('div', 'bkbg-sty-section', { |
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paddingTop: o.paddingTop + 'px', |
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paddingBottom: o.paddingBottom + 'px' |
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}); |
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|
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typoCssVarsForEl(section, o.titleTypo, '--bksty-tt-'); |
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typoCssVarsForEl(section, o.eyebrowTypo, '--bksty-et-'); |
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typoCssVarsForEl(section, o.bodyTypo, '--bksty-bt-'); |
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|
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/* Sticky background */ |
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var sticky = mk('div', 'bkbg-sty-sticky', { height: o.stickyHeight }); |
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|
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/* Two bg layers for crossfade */ |
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var bgA = mk('div', 'bkbg-sty-bg-layer'); |
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var bgB = mk('div', 'bkbg-sty-bg-layer'); |
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var overlay = mk('div', 'bkbg-sty-overlay'); |
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|
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var firstBg = chapters[0].imageUrl || o.defaultBgUrl; |
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if (firstBg) { |
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bgA.style.backgroundImage = 'url(' + firstBg + ')'; |
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bgA.style.opacity = '1'; |
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} |
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bgB.style.opacity = '0'; |
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|
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sticky.appendChild(bgA); |
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sticky.appendChild(bgB); |
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sticky.appendChild(overlay); |
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section.appendChild(sticky); |
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|
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/* Text panels */ |
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var panelsWrap = mk('div', 'bkbg-sty-panels'); |
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/* Pull panels UP to overlap sticky (sticky is pos:sticky so panels scroll over it) */ |
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panelsWrap.style.marginTop = '-' + o.stickyHeight; |
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|
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var panelEls = []; |
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|
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chapters.forEach(function (ch) { |
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var panel = mk('div', 'bkbg-sty-panel sty-pos-' + o.textPosition, { |
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minHeight: o.stickyHeight, |
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padding: '0 48px' |
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}); |
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|
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var inner = mk('div', 'bkbg-sty-panel-inner', { |
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width: o.panelWidth + 'px', |
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background: o.textBg || 'rgba(0,0,0,0.45)', |
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color: o.textColor |
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}); |
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|
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if (ch.eyebrow) { |
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var ew = mk('span', 'bkbg-sty-eyebrow', { color: o.eyebrowColor }); |
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ew.textContent = ch.eyebrow; |
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inner.appendChild(ew); |
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} |
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|
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var titleEl = mk('h2', 'bkbg-sty-title', { color: o.titleColor }); |
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titleEl.innerHTML = ch.title || ''; |
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inner.appendChild(titleEl); |
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|
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if (ch.text) { |
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var textEl = mk('p', 'bkbg-sty-text', { color: o.textColor }); |
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textEl.innerHTML = ch.text; |
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inner.appendChild(textEl); |
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} |
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|
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panel.appendChild(inner); |
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panelsWrap.appendChild(panel); |
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panelEls.push(panel); |
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}); |
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|
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section.appendChild(panelsWrap); |
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|
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/* Progress indicator */ |
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var progressEl = null; |
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var progressDots = []; |
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if (o.showProgress) { |
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progressEl = mk('div', 'bkbg-sty-progress'); |
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chapters.forEach(function (_, i) { |
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var dot = mk('div', 'bkbg-sty-progress-dot' + (i === 0 ? ' active' : ''), { |
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background: i === 0 ? o.progressColor : 'rgba(255,255,255,0.4)', |
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border: '2px solid ' + o.progressColor |
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}); |
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dot.title = chapters[i].title || ''; |
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dot.dataset.index = i; |
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dot.addEventListener('click', function () { |
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panelEls[i].scrollIntoView({ behavior: 'smooth', block: 'center' }); |
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}); |
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progressEl.appendChild(dot); |
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progressDots.push(dot); |
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}); |
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section.appendChild(progressEl); |
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} |
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|
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/* IntersectionObserver for chapter changes */ |
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var activeBgUrl = firstBg; |
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var activeLayer = bgA; /* currently shown */ |
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var hiddenLayer = bgB; |
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var activeIndex = -1; |
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|
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function setActiveChapter(idx) { |
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if (idx === activeIndex) return; |
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activeIndex = idx; |
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var ch = chapters[idx]; |
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|
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/* swap overlay */ |
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var opacity = (ch.overlayOpacity || 0) / 100; |
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overlay.style.background = ch.overlayColor |
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? 'rgba(' + hexToRgb(ch.overlayColor) + ',' + opacity + ')' |
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: 'rgba(0,0,0,' + opacity + ')'; |
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|
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/* bg transition */ |
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var newUrl = ch.imageUrl || o.defaultBgUrl; |
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if (newUrl !== activeBgUrl) { |
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hiddenLayer.style.backgroundImage = 'url(' + newUrl + ')'; |
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|
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if (o.transitionStyle === 'slide') { |
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hiddenLayer.style.transform = 'translateX(100%)'; |
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hiddenLayer.style.opacity = '1'; |
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hiddenLayer.style.transition = 'transform 0.6s ease, opacity 0.1s'; |
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activeLayer.style.transition = 'transform 0.6s ease'; |
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requestAnimationFrame(function () { |
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hiddenLayer.style.transform = 'translateX(0)'; |
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activeLayer.style.transform = 'translateX(-100%)'; |
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}); |
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} else { |
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hiddenLayer.style.opacity = '0'; |
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hiddenLayer.style.transition = 'opacity 0.6s ease'; |
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activeLayer.style.transition = 'opacity 0.6s ease'; |
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requestAnimationFrame(function () { |
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hiddenLayer.style.opacity = '1'; |
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activeLayer.style.opacity = '0'; |
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}); |
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} |
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|
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/* swap references */ |
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var tmp = activeLayer; activeLayer = hiddenLayer; hiddenLayer = tmp; |
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activeBgUrl = newUrl; |
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|
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/* reset hidden layer after transition */ |
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setTimeout(function () { |
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hiddenLayer.style.transform = ''; |
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hiddenLayer.style.transition = ''; |
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}, 700); |
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} |
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|
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/* progress dots */ |
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if (progressDots.length) { |
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progressDots.forEach(function (d, i) { |
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d.classList.toggle('active', i === idx); |
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d.style.background = i === idx ? o.progressColor : 'rgba(255,255,255,0.4)'; |
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}); |
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} |
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} |
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|
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/* helper: hex to rgb */ |
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function hexToRgb(hex) { |
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var r = parseInt(hex.slice(1, 3), 16); |
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var g = parseInt(hex.slice(3, 5), 16); |
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var b = parseInt(hex.slice(5, 7), 16); |
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return r + ',' + g + ',' + b; |
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} |
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|
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var obs = new IntersectionObserver(function (entries) { |
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entries.forEach(function (entry) { |
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if (entry.isIntersecting) { |
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var idx = panelEls.indexOf(entry.target); |
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if (idx > -1) setActiveChapter(idx); |
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} |
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}); |
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/* show progress when section is in view */ |
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if (progressEl) { |
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var anyVisible = entries.some(function (e) { return e.isIntersecting; }); |
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if (anyVisible) progressEl.classList.add('visible'); |
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} |
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}, { threshold: 0.4 }); |
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|
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panelEls.forEach(function (p) { obs.observe(p); }); |
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if (activeIndex === -1 && panelEls.length) setActiveChapter(0); |
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|
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appEl.parentNode.insertBefore(section, appEl); |
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}); |
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} |
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|
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if (document.readyState !== 'loading') { init(); } |
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else { document.addEventListener('DOMContentLoaded', init); } |
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})(); |
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|
