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/* Lightbox Gallery — frontend.js */ |
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( function () { |
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function initGallery( wrap ) { |
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const items = Array.from( wrap.querySelectorAll( '.bklg-item[data-src]' ) ); |
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const showCaptions = wrap.dataset.captions === '1'; |
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if ( ! items.length ) return; |
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|
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const images = items.map( item => ({ src: item.dataset.src, caption: item.dataset.caption || '' }) ); |
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let current = 0; |
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let lb = null; |
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|
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function openLightbox( idx ) { |
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current = idx; |
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lb = document.createElement('div'); |
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lb.className = 'bklg-lightbox'; |
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lb.setAttribute('role', 'dialog'); |
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lb.setAttribute('aria-modal', 'true'); |
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|
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const inner = document.createElement('div'); inner.className = 'bklg-lb-inner'; |
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const img = document.createElement('img'); img.className = 'bklg-lb-img'; |
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const counter = document.createElement('div'); counter.className = 'bklg-lb-counter'; |
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const close = document.createElement('button'); close.className = 'bklg-lb-close'; close.innerHTML = '×'; close.setAttribute('aria-label', 'Close'); |
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const prev = document.createElement('button'); prev.className = 'bklg-lb-prev'; prev.innerHTML = '‹'; prev.setAttribute('aria-label', 'Previous'); |
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const next = document.createElement('button'); next.className = 'bklg-lb-next'; next.innerHTML = '›'; next.setAttribute('aria-label', 'Next'); |
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|
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function show( i ) { |
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current = ( i + images.length ) % images.length; |
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img.src = images[current].src; |
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counter.textContent = ( current + 1 ) + ' / ' + images.length; |
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caption.textContent = images[current].caption || ''; |
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} |
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|
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const caption = document.createElement('p'); caption.className = 'bklg-lb-caption'; |
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|
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inner.appendChild(img); |
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if ( showCaptions ) inner.appendChild(caption); |
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lb.appendChild(inner); |
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lb.appendChild(close); |
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if ( images.length > 1 ) { lb.appendChild(prev); lb.appendChild(next); } |
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lb.appendChild(counter); |
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document.body.appendChild(lb); |
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document.body.style.overflow = 'hidden'; |
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show(idx); |
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|
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close.addEventListener('click', closeLightbox); |
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lb.addEventListener('click', function(e){ if(e.target===lb) closeLightbox(); }); |
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prev.addEventListener('click', function(e){ e.stopPropagation(); show(current-1); }); |
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next.addEventListener('click', function(e){ e.stopPropagation(); show(current+1); }); |
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|
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document.addEventListener('keydown', onKey); |
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|
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// Touch swipe |
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let tx = 0; |
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lb.addEventListener('touchstart', e=>{ tx=e.changedTouches[0].clientX; }, {passive:true}); |
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lb.addEventListener('touchend', e=>{ const dx=e.changedTouches[0].clientX-tx; if(Math.abs(dx)>50) show(dx<0?current+1:current-1); }, {passive:true}); |
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} |
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|
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function closeLightbox() { |
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if (lb) { lb.remove(); lb=null; } |
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document.body.style.overflow = ''; |
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document.removeEventListener('keydown', onKey); |
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} |
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|
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function onKey(e) { |
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if (e.key === 'Escape') closeLightbox(); |
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if (e.key === 'ArrowLeft') { const p = lb && lb.querySelector('.bklg-lb-prev'); p && p.click(); } |
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if (e.key === 'ArrowRight') { const n = lb && lb.querySelector('.bklg-lb-next'); n && n.click(); } |
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} |
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|
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items.forEach( function(item, i) { |
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item.querySelector('.bklg-thumb').addEventListener('click', function() { openLightbox(i); }); |
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item.querySelector('.bklg-thumb').style.cursor = 'zoom-in'; |
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}); |
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} |
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|
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function init() { |
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document.querySelectorAll('.bklg-wrap[data-lightbox]').forEach(initGallery); |
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} |
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|
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if ( document.readyState === 'loading' ) { |
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document.addEventListener('DOMContentLoaded', init); |
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} else { |
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init(); |
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} |
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}() ); |
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