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/**
* Photo gallery in JavaScript
*
* Copyright 2024 Jochem Kossen
*
* Permission is hereby granted, free of charge, to any person obtaining a
* copy ofthis software and associated documentation files (the “Software”),
* to deal in the Software without restriction, including without limitation
* the rights to use, copy, modify, merge, publish, distribute, sublicense,
* and/or sell copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following conditions:
*
* The above copyright notice and this permission notice shall be included
* in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS
* OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
* FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
* AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
* LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS
* IN THE SOFTWARE.
*
*/
/**
* Main script loop
*/
const main = function () {
const galleries = document.getElementsByClassName("gallery");
for (let i = 0; i < galleries.length; i++) {
const gallery = galleries[i];
const lightbox = createLightbox();
if (gallery instanceof HTMLElement) {
createGallery(gallery, lightbox);
}
}
};
/**
* Create a Lightbox instance
*
* @returns {object}
*/
const createLightbox = function () {
const lightbox = document.createElement("div");
const lightboxContent = document.createElement("div");
const img = document.createElement("img");
const closeLink = document.createElement("a");
const prevLink = document.createElement("a");
const nextLink = document.createElement("a");
/** @type {function} */
let onPrev;
/** @type {function} */
let onNext;
closeLink.href = "#";
closeLink.innerHTML = "×";
prevLink.href = "#";
prevLink.innerHTML = "❮";
nextLink.href = "#";
nextLink.innerHTML = "❯";
lightbox.id = "lightbox";
lightbox.className = "lightbox";
lightbox.appendChild(closeLink);
lightboxContent.appendChild(prevLink);
lightboxContent.appendChild(img);
lightboxContent.appendChild(nextLink);
lightbox.appendChild(lightboxContent);
/**
* @param {function} fn
*/
const setOnPrev = (fn) => (onPrev = fn);
/**
* @param {function} fn
*/
const setOnNext = (fn) => (onNext = fn);
/**
* @param {string} uri
*/
const show = function (uri) {
setImage(uri);
lightbox.style.display = "block";
};
const hide = function () {
lightbox.style.display = "none";
};
/**
* @param {string} uri
*/
const setImage = function (uri) {
img.src = uri;
};
/**
* Make the buttons in the lightbox work
*/
const enableLightboxButtons = function () {
closeLink.addEventListener("click", (event) => {
event.preventDefault();
hide();
});
prevLink.addEventListener("click", (event) => {
event.preventDefault();
if (onPrev) {
onPrev();
}
});
nextLink.addEventListener("click", (event) => {
event.preventDefault();
if (onNext) {
onNext();
}
});
window.addEventListener("keydown", (event) => {
if (lightbox.style.display !== "block") {
return;
}
if (event.key === "ArrowLeft") {
if (onPrev) {
onPrev();
}
} else if (event.key === "ArrowRight") {
if (onNext) {
onNext();
}
} else if (event.key === "Escape" || event.key === "x") {
hide();
}
});
};
enableLightboxButtons();
document.body.appendChild(lightbox);
return { show, setOnPrev, setOnNext };
};
/**
* Create a Gallery instance
*
* @param {HTMLElement} element
* @param {object} lightbox
*/
const createGallery = function (element, lightbox) {
/** @type {Array.<HTMLElement>} */
const slides = [];
/** @type {number} */
let prevSlide = 0;
/** @type {number} */
let nextSlide = 1;
const findSlides = function () {
const thumbnails = element.getElementsByTagName("figure");
for (let i = 0; i < thumbnails.length; i++) {
slides.push(thumbnails[i]);
}
};
const enableLightbox = function () {
for (let i = 0; i < slides.length; i++) {
slides[i].firstElementChild?.addEventListener("click", (event) => {
event.preventDefault();
showLightbox(i);
});
}
};
/**
* @param {number} slideNr
*/
const showLightbox = function (slideNr) {
prevSlide = slideNr <= 0 ? slides.length - 1 : slideNr - 1;
nextSlide = slideNr >= slides.length - 1 ? 0 : slideNr + 1;
const link = slides[slideNr].firstElementChild;
if (link instanceof HTMLAnchorElement) {
lightbox.show(link.href);
}
};
findSlides();
lightbox.setOnPrev(() => showLightbox(prevSlide));
lightbox.setOnNext(() => showLightbox(nextSlide));
enableLightbox();
};
/**
* Start up the galleries
*/
main();
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