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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) { |
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return; |
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} |
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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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|
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var current = 0; |
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var total = slides.length; |
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if (!total) { |
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return; |
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} |
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|
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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) { |
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idx = ((idx % total) + total) % total; |
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current = idx; |
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|
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slides.forEach(function (s, i) { |
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s.classList.toggle('is-active', i === current); |
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}); |
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thumbBtns.forEach(function (t, i) { |
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t.classList.toggle('is-active', i === current); |
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}); |
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|
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if (counter) { |
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counter.textContent = current + 1 + ' / ' + total; |
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} |
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|
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var capText = captions[current] || ''; |
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if (caption) { |
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caption.textContent = capText; |
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} |
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if (belowCap) { |
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belowCap.textContent = capText; |
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} |
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|
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if (lbEl && lbEl._updateLbImg) { |
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lbEl._updateLbImg(); |
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} |
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} |
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|
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thumbBtns.forEach(function (btn, i) { |
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btn.addEventListener('click', function () { |
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goTo(i); |
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}); |
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}); |
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|
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if (prevBtn) { |
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prevBtn.addEventListener('click', function () { |
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goTo(current - 1); |
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}); |
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} |
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if (nextBtn) { |
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nextBtn.addEventListener('click', function () { |
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goTo(current + 1); |
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}); |
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} |
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|
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var lbEl = null; |
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function openLightbox() { |
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if (lbEl) { |
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return; |
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} |
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lbEl = document.createElement('div'); |
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lbEl.className = 'bkbg-gs-lightbox'; |
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|
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var img = document.createElement('img'); |
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var srcImg = slides[current] && slides[current].querySelector('img'); |
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img.src = srcImg ? srcImg.src : ''; |
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img.alt = captions[current] || ''; |
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|
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var closeBtn = document.createElement('button'); |
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closeBtn.type = 'button'; |
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closeBtn.className = 'bkbg-gs-lightbox-close'; |
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closeBtn.setAttribute('aria-label', 'Close'); |
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closeBtn.textContent = '×'; |
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closeBtn.addEventListener('click', closeLightbox); |
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|
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var prevLb = document.createElement('button'); |
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prevLb.type = '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 (e) { |
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e.stopPropagation(); |
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goTo(current - 1); |
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}); |
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|
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var nextLb = document.createElement('button'); |
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nextLb.type = '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 (e) { |
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e.stopPropagation(); |
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goTo(current + 1); |
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}); |
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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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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) { |
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if (e.target === lbEl) { |
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closeLightbox(); |
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} |
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}); |
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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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|
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function closeLightbox() { |
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if (lbEl) { |
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lbEl.remove(); |
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lbEl = null; |
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document.body.style.overflow = ''; |
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} |
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} |
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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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if (enableKbd) { |
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document.addEventListener('keydown', function (e) { |
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if (!wrap.isConnected) { |
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return; |
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} |
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if (e.key === 'ArrowLeft') { |
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goTo(current - 1); |
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} |
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if (e.key === 'ArrowRight') { |
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goTo(current + 1); |
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} |
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if (e.key === 'Escape' && enableLb) { |
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closeLightbox(); |
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} |
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}); |
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} |
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|
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var touchStartX = 0; |
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mainEl.addEventListener('touchstart', function (e) { |
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touchStartX = e.touches[0].clientX; |
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}, { 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) { |
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goTo(dx < 0 ? current + 1 : current - 1); |
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} |
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}, { passive: true }); |
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|
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goTo(0); |
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}); |
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})(); |
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|
