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t.classList.toggle('selected', i === idx)); // read correct data-attribute const newSrc = thumbnails[idx].getAttribute('data-image-large-src'); mainImage.src = newSrc; currentIndex = idx; } // 3) left arrow click arrowLeft?.addEventListener('click', () => { const prev = (currentIndex - 1 + thumbnails.length) % thumbnails.length; updateMainImage(prev); }); // 4) right arrow click arrowRight?.addEventListener('click', () => { const next = (currentIndex + 1) % thumbnails.length; updateMainImage(next); }); // 5) Left/Right key on the keyboard document.addEventListener('keydown', (event) => { if (event.key === 'ArrowLeft') { const prevKey = (currentIndex === 0) ? thumbnails.length - 1 : currentIndex - 1; updateMainImage(prevKey); } else if (event.key === 'ArrowRight') { const nextKey = (currentIndex === thumbnails.length - 1) ? 0 : currentIndex + 1; updateMainImage(nextKey); } }); // 6) initialize first image updateMainImage(0); })();