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(() => {
const mainEl = document.querySelector("main");
const lightboxContainerEl = document.querySelector(".js-lightbox");
const lightboxEl = lightboxContainerEl.classList.contains("o-lightbox")
? lightboxContainerEl
: lightboxContainerEl.querySelector(".o-lightbox");
const lightboxCloseEl = lightboxEl.querySelector(".o-lightbox__close-btn");
const lightboxPrevEl = lightboxEl.querySelector(".o-lightbox__nav-btn--prev");
const lightboxNextEl = lightboxEl.querySelector(".o-lightbox__nav-btn--next");
const lightboxImgEl = lightboxEl.querySelector(".o-lightbox__img");
const lightboxThumbnailsEl = lightboxEl.querySelector(".o-lightbox__thumbnails");
const figureEls = Array.from(mainEl.querySelectorAll(".js-lightbox__image"));
const standalone = lightboxContainerEl.classList.contains("js-lightbox--standalone");
let currentIndex = 0;
let visible = !lightboxContainerEl.classList.contains("u-d-none");
let mouseDown = false;
const show = () => {
visible = true;
lightboxContainerEl.classList.remove("u-d-none");
}
const hide = () => {
if (!standalone) {
visible = false;
lightboxContainerEl.classList.add("u-d-none");
}
}
const setIndex = (i) => {
if (i < 0 || i >= images.length) {
return;
}
images[currentIndex].thumbnailEl.classList.remove("is-selected");
currentIndex = i;
lightboxImgEl.src = figureEls[i].firstElementChild.href;
lightboxImgEl.alt = images[currentIndex].description;
images[i].thumbnailEl.classList.add("is-selected");
};
const prev = () => setIndex(currentIndex > 0 ? currentIndex - 1 : figureEls.length - 1);
const next = () => setIndex(currentIndex < figureEls.length - 1 ? currentIndex + 1 : 0);
lightboxCloseEl?.addEventListener("click", hide);
lightboxPrevEl.addEventListener("click", prev);
lightboxNextEl.addEventListener("click", next);
const images = figureEls.map((figureEl, i) => {
const go = e => {
e.preventDefault();
show();
setIndex(i);
};
const imgEl = figureEl.querySelector("img");
const captionEl = figureEl.querySelector("figcaption");
const src = imgEl.src;
const description = captionEl?.innerHTML ?? "";
const thumbnailButtonEl = document.createElement("button");
const thumbnailImgEl = document.createElement("img");
thumbnailImgEl.classList.add("o-lightbox__thumbnail-img");
thumbnailImgEl.src = src;
thumbnailButtonEl.classList.add("o-lightbox__thumbnail");
thumbnailButtonEl.appendChild(thumbnailImgEl);
thumbnailButtonEl.addEventListener("click", go);
lightboxThumbnailsEl.appendChild(thumbnailButtonEl);
if (!standalone) {
figureEl.firstElementChild.addEventListener("click", go);
}
return {
thumbnailEl: thumbnailButtonEl,
description,
};
});
setIndex(0);
if (figureEls.length <= 1) {
lightboxPrevEl.remove();
lightboxNextEl.remove();
lightboxThumbnailsEl.remove();
}
if (!standalone) {
document.addEventListener('mousedown', (e) => {
if (visible) {
mouseDown = !lightboxEl.contains(e.target) || lightboxEl === e.target;
}
});
document.addEventListener('click', (e) => {
if (visible && mouseDown) {
mouseDown = false;
e.preventDefault();
e.stopPropagation();
hide();
}
}, { capture: true });
}
window.addEventListener("keydown", e => {
if (e.defaultPrevented || !visible) {
return;
}
switch (e.key) {
case "Left":
case "ArrowLeft":
prev();
break;
case "Right":
case "ArrowRight":
next();
break;
case "Esc":
case "Escape":
hide();
break;
default:
return;
}
e.preventDefault();
}, true);
})();
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