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<!DOCTYPE html>
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<html>
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<head>
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<title>Image Gallery</title>
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<style>
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.gallery-img {
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width: 100%;
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height: auto;
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object-fit: cover;
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border-radius: 8px;
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cursor: pointer;
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}
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#gallery {
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display: grid;
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grid-gap: 10px;
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padding: 10px;
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margin: auto;
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}
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#lightbox {
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display: none;
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position: fixed;
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top: 0;
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left: 0;
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width: 100%;
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height: 100%;
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background-color: rgba(0, 0, 0, 0.8);
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align-items: center;
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justify-content: center;
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z-index: 1000;
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}
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#lightbox img {
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max-width: 80%;
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max-height: 80%;
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}
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#lightbox #caption {
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color: white;
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margin-top: 20px;
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position: absolute;
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bottom: 10px;
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left: 50%;
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transform: translateX(-50%);
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text-align: center;
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}
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</style>
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</head>
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<body>
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<header>
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<h1>Image Gallery</h1>
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</header>
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<main>
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<input type="range" id="layoutSlider" min="1" max="20" value="10" width="100%">
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<div id="gallery"></div>
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</main>
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<!-- Lightbox element -->
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<div id="lightbox" onclick="closeLightbox()">
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<img id="lightbox-img" src="#" alt="Preview">
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<div id="caption"></div>
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</div>
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<script>
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var currentImageIndex = -1;
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var imageArray = [];
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function loadImages() {
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var gallery = document.getElementById('gallery');
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for (var i = 0; i <= 199; i++) {
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let imageName = 'v' + i + '.png';
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let img = document.createElement('img');
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img.src = imageName;
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img.onerror = function() { this.style.display = 'none'; };
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img.onload = function() {
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this.classList.add('gallery-img');
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this.onclick = function() {
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openLightbox(this.src, this.src.split('/').pop());
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currentImageIndex = imageArray.indexOf(this);
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};
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// Add only visible images to the array
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imageArray.push(this);
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};
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gallery.appendChild(img);
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}
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}
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function updateGridLayout(columns) {
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var gallery = document.getElementById('gallery');
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gallery.style.gridTemplateColumns = `repeat(${columns}, 1fr)`;
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}
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document.getElementById('layoutSlider').addEventListener('input', function() {
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updateGridLayout(this.value);
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});
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function openLightbox(src, filename) {
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document.getElementById('lightbox').style.display = 'flex';
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document.getElementById('lightbox-img').src = src;
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document.getElementById('caption').textContent = filename;
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}
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function closeLightbox() {
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document.getElementById('lightbox').style.display = 'none';
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}
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// Keyboard navigation for lightbox
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document.onkeydown = function(e) {
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if (document.getElementById('lightbox').style.display === 'flex') {
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if (e.key === 'ArrowRight') {
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navigateLightbox(1); // Next image
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} else if (e.key === 'ArrowLeft') {
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navigateLightbox(-1); // Previous image
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}
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}
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};
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function navigateLightbox(direction) {
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var newIndex = currentImageIndex + direction;
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// Looping over if the index goes out of bounds
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if (newIndex >= imageArray.length) {
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newIndex = 0;
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} else if (newIndex < 0) {
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newIndex = imageArray.length - 1;
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}
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// Checking if the new image is visible
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if (imageArray[newIndex].style.display !== 'none') {
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currentImageIndex = newIndex;
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var newImage = imageArray[currentImageIndex];
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openLightbox(newImage.src, newImage.src.split('/').pop());
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} else {
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// Recursively call the function to skip non-visible images
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navigateLightbox(direction);
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}
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}
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window.onload = function() {
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loadImages();
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updateGridLayout(document.getElementById('layoutSlider').value);
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};
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</script>
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</body>
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</html>
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