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(function () { |
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'use strict'; |
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|
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function buildGallery(appEl, o) { |
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if (!o.images || !o.images.length) return; |
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|
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var images = o.images; |
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var current = 0; |
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var autoTimer = null; |
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|
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var wrap = document.createElement('div'); |
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wrap.className = 'bkbg-tgal-wrap'; |
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wrap.style.paddingTop = (o.paddingTop || 0) + 'px'; |
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wrap.style.paddingBottom = (o.paddingBottom || 0) + 'px'; |
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if (o.bgColor) wrap.style.background = o.bgColor; |
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|
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var inner = document.createElement('div'); |
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inner.className = 'bkbg-tgal-inner'; |
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inner.style.maxWidth = (o.maxWidth || 900) + 'px'; |
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inner.style.margin = '0 auto'; |
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|
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var pos = o.thumbPosition || 'bottom'; |
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var container = document.createElement('div'); |
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container.className = 'bkbg-tgal-container pos-' + pos; |
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container.style.gap = '12px'; |
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|
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/* ── main image ── */ |
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var main = document.createElement('div'); |
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main.className = 'bkbg-tgal-main'; |
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main.style.borderRadius = (o.mainBorderRadius || 12) + 'px'; |
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main.style.overflow = 'hidden'; |
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main.style.background = o.mainBg || '#000'; |
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main.style.aspectRatio = (o.mainAspect || '16/9').replace('/', ' / '); |
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main.style.position = 'relative'; |
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|
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var mainImg = document.createElement('img'); |
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mainImg.className = 'bkbg-tgal-main-img'; |
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mainImg.src = images[0].url || ''; |
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mainImg.alt = images[0].alt || ''; |
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mainImg.style.objectFit = o.mainObjectFit || 'cover'; |
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main.appendChild(mainImg); |
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|
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/* caption */ |
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var caption = null; |
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if (o.showCaptions) { |
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caption = document.createElement('div'); |
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caption.className = 'bkbg-tgal-caption'; |
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caption.style.background = o.captionBg || 'rgba(0,0,0,0.6)'; |
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caption.style.color = o.captionColor || '#fff'; |
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caption.textContent = images[0].caption || ''; |
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if (!images[0].caption) caption.style.display = 'none'; |
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main.appendChild(caption); |
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} |
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|
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/* counter */ |
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var counter = null; |
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if (o.showCounter) { |
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counter = document.createElement('div'); |
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counter.className = 'bkbg-tgal-counter'; |
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counter.style.background = o.counterBg || 'rgba(0,0,0,0.55)'; |
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counter.style.color = o.counterColor || '#fff'; |
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counter.textContent = '1 / ' + images.length; |
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main.appendChild(counter); |
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} |
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|
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/* zoom */ |
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if (o.showZoom) { |
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var zoom = document.createElement('button'); |
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zoom.className = 'bkbg-tgal-zoom'; |
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zoom.style.background = o.zoomIconBg || 'rgba(0,0,0,0.45)'; |
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zoom.style.color = o.zoomIconColor || '#fff'; |
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zoom.innerHTML = '➚'; |
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zoom.setAttribute('aria-label', 'Zoom image'); |
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zoom.addEventListener('click', function (e) { |
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e.stopPropagation(); |
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openLightbox(current); |
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}); |
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main.appendChild(zoom); |
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} |
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|
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/* arrows */ |
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if (o.showArrows && images.length > 1) { |
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var prevBtn = document.createElement('button'); |
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prevBtn.className = 'bkbg-tgal-arrow prev'; |
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prevBtn.style.background = o.arrowBg || 'rgba(0,0,0,0.45)'; |
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prevBtn.style.color = o.arrowColor || '#fff'; |
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prevBtn.innerHTML = '‹'; |
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prevBtn.setAttribute('aria-label', 'Previous image'); |
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prevBtn.addEventListener('click', function () { goTo((current - 1 + images.length) % images.length); }); |
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|
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var nextBtn = document.createElement('button'); |
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nextBtn.className = 'bkbg-tgal-arrow next'; |
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nextBtn.style.background = o.arrowBg || 'rgba(0,0,0,0.45)'; |
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nextBtn.style.color = o.arrowColor || '#fff'; |
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nextBtn.innerHTML = '›'; |
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nextBtn.setAttribute('aria-label', 'Next image'); |
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nextBtn.addEventListener('click', function () { goTo((current + 1) % images.length); }); |
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|
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main.appendChild(prevBtn); |
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main.appendChild(nextBtn); |
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} |
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|
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/* ── thumbnail strip ── */ |
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var strip = document.createElement('div'); |
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strip.className = 'bkbg-tgal-strip'; |
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strip.style.gap = (o.thumbGap || 8) + 'px'; |
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|
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var thumbEls = []; |
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var thumbW = (o.thumbSize || 72) * 1.4; |
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var thumbH = o.thumbSize || 72; |
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var isVert = pos === 'left' || pos === 'right'; |
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|
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images.forEach(function (img, idx) { |
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var thumb = document.createElement('div'); |
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thumb.className = 'bkbg-tgal-thumb' + (idx === 0 ? ' is-active' : ''); |
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thumb.style.width = (isVert ? thumbH : thumbW) + 'px'; |
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thumb.style.height = thumbH + 'px'; |
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thumb.style.borderRadius = (o.thumbBorderRadius || 6) + 'px'; |
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thumb.style.backgroundImage = img.url ? 'url(' + img.url + ')' : 'none'; |
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thumb.style.backgroundColor = o.thumbBg || '#e5e7eb'; |
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thumb.style.border = (o.thumbActiveBorderWidth || 2) + 'px solid ' + (idx === 0 ? (o.thumbActiveBorder || '#6366f1') : 'transparent'); |
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thumb.style.transition = 'border-color 0.15s, opacity 0.15s'; |
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thumb.setAttribute('role', 'button'); |
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thumb.setAttribute('tabindex', '0'); |
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thumb.setAttribute('aria-label', img.title || img.alt || 'Image ' + (idx + 1)); |
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thumb.addEventListener('click', function () { goTo(idx); }); |
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thumb.addEventListener('keydown', function (e) { if (e.key === 'Enter' || e.key === ' ') { e.preventDefault(); goTo(idx); } }); |
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strip.appendChild(thumb); |
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thumbEls.push(thumb); |
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}); |
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|
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/* ── switch image ── */ |
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function goTo(idx) { |
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if (idx === current || idx < 0 || idx >= images.length) return; |
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var prev = current; |
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current = idx; |
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|
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var anim = o.animationType || 'fade'; |
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|
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if (anim === 'fade') { |
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mainImg.style.transition = 'opacity 0.3s ease'; |
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mainImg.style.opacity = '0'; |
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setTimeout(function () { |
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mainImg.src = images[idx].url || ''; |
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mainImg.alt = images[idx].alt || ''; |
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mainImg.style.opacity = '1'; |
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}, 300); |
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} else { |
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/* slide */ |
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mainImg.style.transition = 'transform 0.3s ease, opacity 0.3s ease'; |
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var dir = idx > prev ? 1 : -1; |
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mainImg.style.transform = 'translateX(' + (-dir * 30) + 'px)'; |
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mainImg.style.opacity = '0'; |
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setTimeout(function () { |
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mainImg.src = images[idx].url || ''; |
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mainImg.alt = images[idx].alt || ''; |
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mainImg.style.transition = 'none'; |
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mainImg.style.transform = 'translateX(' + (dir * 30) + 'px)'; |
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mainImg.style.opacity = '0'; |
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requestAnimationFrame(function () { |
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requestAnimationFrame(function () { |
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mainImg.style.transition = 'transform 0.3s ease, opacity 0.3s ease'; |
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mainImg.style.transform = 'translateX(0)'; |
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mainImg.style.opacity = '1'; |
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}); |
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}); |
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}, 310); |
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} |
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|
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if (caption) { |
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caption.textContent = images[idx].caption || ''; |
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caption.style.display = images[idx].caption ? '' : 'none'; |
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} |
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if (counter) { |
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counter.textContent = (idx + 1) + ' / ' + images.length; |
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} |
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|
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/* update thumbs */ |
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thumbEls.forEach(function (th, ti) { |
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th.classList.toggle('is-active', ti === idx); |
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th.style.border = (o.thumbActiveBorderWidth || 2) + 'px solid ' + (ti === idx ? (o.thumbActiveBorder || '#6366f1') : 'transparent'); |
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}); |
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|
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/* scroll active thumb into view */ |
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var activeTh = thumbEls[idx]; |
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if (activeTh && activeTh.scrollIntoView) { |
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activeTh.scrollIntoView({ block: 'nearest', inline: 'nearest' }); |
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} |
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|
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/* reset autoplay timer */ |
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if (o.autoPlay && autoTimer) { |
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clearTimeout(autoTimer); |
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scheduleAuto(); |
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} |
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} |
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|
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/* ── auto-play ── */ |
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function scheduleAuto() { |
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autoTimer = setTimeout(function () { |
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goTo((current + 1) % images.length); |
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}, o.autoPlayDelay || 4000); |
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} |
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|
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if (o.autoPlay && images.length > 1) { |
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scheduleAuto(); |
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} |
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|
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/* ── lightbox ── */ |
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function openLightbox(startIdx) { |
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var lb = document.createElement('div'); |
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lb.className = 'bkbg-tgal-lightbox'; |
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|
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var lbIdx = startIdx; |
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|
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var lbImg = document.createElement('img'); |
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lbImg.src = images[startIdx].url || ''; |
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lbImg.alt = images[startIdx].alt || ''; |
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lb.appendChild(lbImg); |
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|
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var closeBtn = document.createElement('button'); |
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closeBtn.className = 'bkbg-tgal-lb-close'; |
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closeBtn.innerHTML = '×'; |
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closeBtn.setAttribute('aria-label', 'Close'); |
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closeBtn.addEventListener('click', function () { document.body.removeChild(lb); }); |
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lb.appendChild(closeBtn); |
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|
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if (images.length > 1) { |
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var lbPrev = document.createElement('button'); |
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lbPrev.className = 'bkbg-tgal-lb-arrow prev'; |
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lbPrev.innerHTML = '‹'; |
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lbPrev.setAttribute('aria-label', 'Previous'); |
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lbPrev.addEventListener('click', function () { |
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lbIdx = (lbIdx - 1 + images.length) % images.length; |
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lbImg.src = images[lbIdx].url || ''; |
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lbImg.alt = images[lbIdx].alt || ''; |
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}); |
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|
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var lbNext = document.createElement('button'); |
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lbNext.className = 'bkbg-tgal-lb-arrow next'; |
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lbNext.innerHTML = '›'; |
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lbNext.setAttribute('aria-label', 'Next'); |
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lbNext.addEventListener('click', function () { |
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lbIdx = (lbIdx + 1) % images.length; |
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lbImg.src = images[lbIdx].url || ''; |
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lbImg.alt = images[lbIdx].alt || ''; |
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}); |
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|
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lb.appendChild(lbPrev); |
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lb.appendChild(lbNext); |
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} |
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|
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lb.addEventListener('click', function (e) { |
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if (e.target === lb) document.body.removeChild(lb); |
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}); |
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|
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document.addEventListener('keydown', function lbKey(e) { |
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if (e.key === 'Escape') { if (document.body.contains(lb)) document.body.removeChild(lb); document.removeEventListener('keydown', lbKey); } |
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if (e.key === 'ArrowLeft') { lbIdx = (lbIdx - 1 + images.length) % images.length; lbImg.src = images[lbIdx].url || ''; lbImg.alt = images[lbIdx].alt || ''; } |
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if (e.key === 'ArrowRight') { lbIdx = (lbIdx + 1) % images.length; lbImg.src = images[lbIdx].url || ''; lbImg.alt = images[lbIdx].alt || ''; } |
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}); |
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|
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document.body.appendChild(lb); |
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} |
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|
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/* ── assemble ── */ |
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if (pos === 'top') { |
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container.appendChild(strip); |
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container.appendChild(main); |
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} else if (pos === 'left') { |
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container.appendChild(strip); |
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container.appendChild(main); |
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} else if (pos === 'right') { |
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container.appendChild(main); |
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container.appendChild(strip); |
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} else { |
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/* bottom (default) */ |
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container.appendChild(main); |
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container.appendChild(strip); |
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} |
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|
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inner.appendChild(container); |
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wrap.appendChild(inner); |
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|
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appEl.parentNode.insertBefore(wrap, appEl); |
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appEl.style.display = 'none'; |
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} |
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|
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function init() { |
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document.querySelectorAll('.bkbg-tgal-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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|
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var opts; |
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try { opts = JSON.parse(appEl.dataset.opts || '{}'); } catch (e) { opts = {}; } |
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|
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var o = Object.assign({ |
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images: [], |
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thumbPosition: 'bottom', |
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thumbSize: 72, |
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thumbGap: 8, |
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thumbBorderRadius: 6, |
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mainAspect: '16/9', |
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mainBorderRadius: 12, |
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mainObjectFit: 'cover', |
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showCaptions: true, |
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showCounter: true, |
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showZoom: true, |
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showArrows: true, |
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animationType: 'fade', |
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autoPlay: false, |
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autoPlayDelay: 4000, |
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thumbActiveBorderWidth: 2, |
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maxWidth: 900, |
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paddingTop: 0, |
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paddingBottom: 0, |
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bgColor: '', |
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mainBg: '#000000', |
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captionBg: 'rgba(0,0,0,0.6)', |
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captionColor: '#ffffff', |
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counterBg: 'rgba(0,0,0,0.55)', |
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counterColor: '#ffffff', |
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thumbActiveBorder: '#6366f1', |
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thumbBg: '#e5e7eb', |
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arrowBg: 'rgba(0,0,0,0.45)', |
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arrowColor: '#ffffff', |
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zoomIconColor: '#ffffff', |
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zoomIconBg: 'rgba(0,0,0,0.45)' |
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}, opts); |
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|
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buildGallery(appEl, o); |
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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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|
