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photos.html
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<!DOCTYPE html>
<head>
<title>
Mary Kate & Sean 2021
</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, height=device-height, initial-scale=1.0, maximum-scale=1.0, minimum-scale=1.0, user-scalable=yes">
<meta name="robots" content="noindex">
<link rel="stylesheet" media="all" href="stylesheets/fonts.css">
<link rel="stylesheet" media="all" href="stylesheets/style.css">
<link rel="stylesheet" media="all" href="stylesheets/desktop_menu.css">
<link rel="stylesheet" media="all" href="stylesheets/mobile_menu.css">
<link rel="stylesheet" media="all" href="stylesheets/photo_album.css">
<link rel="stylesheet" media="all" href="stylesheets/media.css">
</head>
<body>
<nav role="navigation">
<div id="title">Mary Kate & Sean 2021</div>
<div id="desktopMenu">
<hr />
<ul>
<a href="index.html"><li>Home</li></a>
<a href="travel.html"><li>Travel</li></a>
<a href="schedule.html"><li>Details</li></a>
<a href="registry.html"><li>Registry</li></a>
<a href="wedding_party.html"><li>Wedding Party</li></a>
<a href="" class="current-page"><li>Photos</li></a>
<a href="activities.html"><li>Chico Guide</li></a>
<a href="games.html"><li>Solitaire</li></a>
</ul>
</div>
<div id="mobileMenu">
<input type="checkbox" />
<span></span>
<span></span>
<span></span>
<ul id="mobileLinks">
<a href="index.html"><li>Home</li></a>
<a href="travel.html"><li>Travel</li></a>
<a href="schedule.html"><li>Details</li></a>
<a href="registry.html"><li>Registry</li></a>
<a href="wedding_party.html"><li>Wedding Party</li></a>
<a href=""><li>Photos</li></a>
<a href="activities.html"><li>Chico Guide</li></a>
<a href="games.html"><li>Solitaire</li></a>
</ul>
</div>
</nav>
<div class="content">
<div class ="contentSection">
<div id="albumSelect">
</div>
<div id="photoAlbum" style="display:none;">
<a href="#"><h1 id="back">< Back</h1></a>
<img id="currentPhoto" src="">
<div id="photoControls">
<button id="prevPhoto"><</button>
<p id="currentPhotoCounter"></p>
<button id="nextPhoto">></button>
</div>
<p id="currentPhotoDesc"></p>
<p id="instructions">Tip: Click a photo to view it in fullscreen. You can also use the arrow keys.</p>
</div>
</div>
</div>
</body>
<footer>
<script>
document.addEventListener('DOMContentLoaded', function() {
var AJAX_LOADER_SRC = "images/ajax_loader.gif";
var PRELOAD_BATCH_SIZE = 5;
var currentAlbum;
var currentPhotoIdx = 0;
var images = {};
var albumSelect = document.getElementById('albumSelect');
var photoAlbum = document.getElementById('photoAlbum');
var currentPhoto = document.getElementById('currentPhoto');
var currentPhotoDesc = document.getElementById('currentPhotoDesc');
var nextPhoto = document.getElementById('nextPhoto');
var prevPhoto = document.getElementById('prevPhoto');
var back = document.getElementById('back');
var instructions = document.getElementById('instructions');
var viewportMeta = document.querySelector('meta[name=viewport]');
var fullscreenEnabled = false
nextPhoto.addEventListener('click', function() {
setCurrentPhoto(currentPhotoIdx + 1);
});
prevPhoto.addEventListener('click', function() {
setCurrentPhoto(currentPhotoIdx - 1);
});
currentPhoto.addEventListener('click', function() {
!fullscreenEnabled ? enterFullscreen() : exitFullscreen();
});
back.addEventListener('click', function(e) {
e.preventDefault();
albumSelect.style.display = 'block';
photoAlbum.style.display = 'none';
});
document.addEventListener('click', function (e) {
if (!e.target.matches('.albumLink')) return;
e.preventDefault();
selectAlbum(e.target.dataset.name);
});
document.addEventListener('keydown', function (e) {
if (e.key === 'ArrowRight') {
setCurrentPhoto(currentPhotoIdx + 1);
} else if (e.key === 'ArrowLeft') {
setCurrentPhoto(currentPhotoIdx - 1);
} else if (e.key === 'ArrowUp') {
enterFullscreen();
} else if (e.key === 'ArrowDown' || e.key === 'Escape') {
exitFullscreen();
}
});
function renderAlbums(albums) {
albums.forEach(album => {
var a = document.createElement("a");
a.href = '#';
var h1 = document.createElement("h1");
h1.className = 'albumLink';
h1.innerHTML = album["title"];
h1.dataset.name = album["name"];
var img = document.createElement("img");
img.className = 'albumLink';
img.dataset.name = album["name"];
img.src = photoPath(album["name"], album["thumbnail"]);
img.height = '200';
var p = document.createElement("p");
p.innerHTML = album["description"];
a.appendChild(h1);
albumSelect.appendChild(a);
albumSelect.appendChild(img);
albumSelect.appendChild(p);
});
}
function selectAlbum(albumName) {
fetch(albumMetadataPath(albumName))
.then(response => response.json())
.then(album => {
currentAlbum = album;
setCurrentPhoto(0);
albumSelect.style.display = 'none';
photoAlbum.style.display = 'block';
});
}
function setCurrentPhoto(newPhotoIdx) {
if (!currentAlbum) { return; }
if (newPhotoIdx < 0) { return; }
if (newPhotoIdx >= currentAlbum.photos.length) { return; }
currentPhotoIdx = newPhotoIdx;
renderControlsAndDesc();
renderImage();
}
function renderControlsAndDesc() {
var imageAlt = currentAlbum.photos[currentPhotoIdx].desc;
currentPhoto.alt = imageAlt;
currentPhotoDesc.innerHTML = imageAlt;
currentPhotoCounter.innerHTML = (currentPhotoIdx + 1) + " of " + currentAlbum.photos.length
switch(currentPhotoIdx) {
case 0:
nextPhoto.style.visibility = 'visible';
prevPhoto.style.visibility = 'hidden';
break;
case (currentAlbum.photos.length - 1):
nextPhoto.style.visibility = 'hidden';
prevPhoto.style.visibility = 'visible';
break;
default:
nextPhoto.style.visibility = 'visible';
prevPhoto.style.visibility = 'visible';
}
if (currentPhotoIdx == 0) {
instructions.style.display = 'block';
} else {
instructions.style.display = 'none';
}
}
function renderImage() {
var imageSrc = photoPath(currentAlbum.name, currentAlbum.photos[currentPhotoIdx].filename);
if (images[imageSrc] !== undefined) {
currentPhoto.src = images[imageSrc].src;
} else {
currentPhoto.src = AJAX_LOADER_SRC;
loadImageBatch();
}
}
function loadImageBatch() {
if (currentPhotoIdx % PRELOAD_BATCH_SIZE !== 0) { return; }
var batchEnd = Math.min(currentPhotoIdx + PRELOAD_BATCH_SIZE, (currentAlbum.photos.length));
for (var i = currentPhotoIdx; i < batchEnd; i++) {
loadImage(i).then(loadedIdx => {
if (loadedIdx === currentPhotoIdx) {
setCurrentPhoto(loadedIdx);
}
});
}
}
async function loadImage(photoIdx) {
var imageSrc = photoPath(currentAlbum.name, currentAlbum.photos[photoIdx].filename);
return new Promise((resolve, reject) => {
if (images[imageSrc] !== undefined) { resolve(photoIdx); }
var img = new Image();
img.onload = function() {
images[imageSrc] = img;
resolve(photoIdx)
};
img.onerror = reject;
img.src = imageSrc;
});
}
function albumMetadataPath(albumName) {
return "/images/photo_albums/" + albumName+ "/album.json";
}
function photoPath(albumName, filename) {
return "/images/photo_albums/" + albumName + "/" + filename;
}
function enterFullscreen() {
fullscreenEnabled = true;
currentPhoto.className = "fullScreen";
}
function exitFullscreen() {
fullscreenEnabled = false;
currentPhoto.className = "";
viewportMeta.setAttribute('content', "initial-scale=1.0, minimum-scale=1.0, maximum-scale=1.0");
}
fetch("images/photo_albums/albums.json")
.then(response => response.json())
.then(albums => {
renderAlbums(albums);
});
});
</script>
</footer>