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(function () { |
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'use strict'; |
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|
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document.querySelectorAll('.bkbg-gs-wrapper').forEach(function (wrap) { |
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var mainEl = wrap.querySelector('.bkbg-gs-main'); |
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if (!mainEl) return; |
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|
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var slides = [].slice.call(wrap.querySelectorAll('.bkbg-gs-slide')); |
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var thumbBtns = [].slice.call(wrap.querySelectorAll('.bkbg-gs-thumb')); |
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var prevBtn = wrap.querySelector('.bkbg-gs-arrow--prev'); |
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var nextBtn = wrap.querySelector('.bkbg-gs-arrow--next'); |
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var counter = wrap.querySelector('.bkbg-gs-counter'); |
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var caption = wrap.querySelector('.bkbg-gs-caption'); |
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var belowCap = wrap.querySelector('.bkbg-gs-below-caption'); |
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var lbTrigger = wrap.querySelector('.bkbg-gs-lightbox-trigger'); |
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var enableLb = wrap.getAttribute('data-lightbox') === '1'; |
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var enableKbd = wrap.getAttribute('data-keyboard') === '1'; |
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var transition= mainEl.getAttribute('data-transition') || 'fade'; |
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var duration = parseInt(mainEl.getAttribute('data-duration') || '320', 10); |
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|
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var current = 0; |
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var total = slides.length; |
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if (!total) return; |
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|
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/* Caption data: pull from slide img alt or dedicated attribute if present */ |
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var captions = slides.map(function (s) { |
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var img = s.querySelector('img'); |
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return (img && img.getAttribute('data-caption')) || (img && img.alt) || ''; |
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}); |
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|
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function goTo(idx, animate) { |
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idx = ((idx % total) + total) % total; |
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if (idx === current && animate !== false) return; |
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|
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var prev = slides[current]; |
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var next = slides[idx]; |
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current = idx; |
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|
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if (transition === 'slide' && animate !== false) { |
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var dir = idx > (current < idx ? current : idx) ? 1 : -1; |
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prev.style.transition = 'none'; |
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next.style.transition = 'none'; |
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next.style.display = ''; |
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next.style.position = 'absolute'; |
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next.style.top = '0'; next.style.left = '0'; next.style.width = '100%'; |
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next.style.transform = 'translateX(' + (100) + '%)'; |
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requestAnimationFrame(function () { |
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prev.style.transition = 'transform ' + duration + 'ms ease'; |
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next.style.transition = 'transform ' + duration + 'ms ease'; |
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prev.style.transform = 'translateX(-100%)'; |
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next.style.transform = 'translateX(0)'; |
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setTimeout(function () { |
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prev.style.display = 'none'; |
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prev.style.transform = ''; |
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prev.style.position = ''; |
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next.style.position = ''; |
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slides.forEach(function (s, i) { s.classList.toggle('is-active', i === current); }); |
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}, duration); |
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}); |
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} else { |
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slides.forEach(function (s, i) { |
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s.style.display = i === idx ? '' : 'none'; |
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s.classList.toggle('is-active', i === idx); |
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}); |
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} |
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|
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/* Thumbs */ |
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thumbBtns.forEach(function (t, i) { t.classList.toggle('is-active', i === current); }); |
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|
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/* Counter */ |
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if (counter) counter.textContent = (current + 1) + ' / ' + total; |
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|
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/* Caption */ |
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var capText = captions[current] || ''; |
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if (caption) caption.textContent = capText; |
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if (belowCap) belowCap.textContent = capText; |
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} |
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|
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/* Thumb clicks */ |
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thumbBtns.forEach(function (btn, i) { |
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btn.addEventListener('click', function () { goTo(i); }); |
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}); |
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|
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/* Arrows */ |
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if (prevBtn) prevBtn.addEventListener('click', function () { goTo(current - 1); }); |
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if (nextBtn) nextBtn.addEventListener('click', function () { goTo(current + 1); }); |
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|
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/* Keyboard */ |
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if (enableKbd) { |
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document.addEventListener('keydown', function (e) { |
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/* Only react when no lightbox is open, or when lightbox is open */ |
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if (e.key === 'ArrowLeft') goTo(current - 1); |
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if (e.key === 'ArrowRight') goTo(current + 1); |
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if (e.key === 'Escape' && enableLb) closeLightbox(); |
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}); |
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} |
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|
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/* Lightbox */ |
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var lbEl = null; |
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function openLightbox() { |
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if (lbEl) return; |
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lbEl = document.createElement('div'); |
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lbEl.className = 'bkbg-gs-lightbox'; |
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var img = document.createElement('img'); |
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var src = (slides[current] && slides[current].querySelector('img') && slides[current].querySelector('img').src) || ''; |
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img.src = src; |
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img.alt = captions[current] || ''; |
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var closeBtn = document.createElement('button'); |
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closeBtn.className = 'bkbg-gs-lightbox-close'; |
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closeBtn.textContent = '×'; |
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closeBtn.addEventListener('click', closeLightbox); |
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var prevLb = document.createElement('button'); |
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prevLb.className = 'bkbg-gs-arrow bkbg-gs-arrow--prev bkbg-gs-arrow--circle'; |
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prevLb.textContent = '‹'; |
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prevLb.addEventListener('click', function () { goTo(current - 1); updateLbImg(); }); |
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var nextLb = document.createElement('button'); |
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nextLb.className = 'bkbg-gs-arrow bkbg-gs-arrow--next bkbg-gs-arrow--circle'; |
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nextLb.textContent = '›'; |
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nextLb.addEventListener('click', function () { goTo(current + 1); updateLbImg(); }); |
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lbEl.appendChild(img); |
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lbEl.appendChild(closeBtn); |
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lbEl.appendChild(prevLb); |
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lbEl.appendChild(nextLb); |
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lbEl.addEventListener('click', function (e) { if (e.target === lbEl) closeLightbox(); }); |
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document.body.appendChild(lbEl); |
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document.body.style.overflow = 'hidden'; |
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|
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function updateLbImg() { |
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var s = slides[current] && slides[current].querySelector('img'); |
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img.src = s ? s.src : ''; |
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img.alt = captions[current] || ''; |
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} |
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lbEl._updateLbImg = updateLbImg; |
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} |
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function closeLightbox() { |
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if (lbEl) { lbEl.remove(); lbEl = null; document.body.style.overflow = ''; } |
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} |
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if (enableLb && lbTrigger) { |
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lbTrigger.addEventListener('click', openLightbox); |
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} |
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|
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/* Swipe support */ |
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var touchStartX = 0; |
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mainEl.addEventListener('touchstart', function (e) { touchStartX = e.touches[0].clientX; }, { passive: true }); |
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mainEl.addEventListener('touchend', function (e) { |
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var dx = e.changedTouches[0].clientX - touchStartX; |
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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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/* Init */ |
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goTo(0, false); |
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}); |
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})(); |
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