136 lines
4.4 KiB
JavaScript
136 lines
4.4 KiB
JavaScript
function openLightbox(post, idx) {
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lightboxCurrentPost = post;
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lightboxCurrentIdx = idx;
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lightboxObj.img.src = lightboxImages.get(post)[idx].src;
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lightboxObj.openOriginalAnchor.href = lightboxImages.get(post)[idx].src
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lightboxObj.prevButton.disabled = lightboxImages.get(post).length === 1
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lightboxObj.nextButton.disabled = lightboxImages.get(post).length === 1
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lightboxObj.imageCount.textContent = `Image ${idx + 1} of ${lightboxImages.get(post).length}`
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if (!lightboxObj.dialog.open) {
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lightboxObj.dialog.showModal();
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}
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}
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const modulo = (n, m) => ((n % m) + m) % m
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function lightboxNext() {
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const l = lightboxImages.get(lightboxCurrentPost).length;
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const target = modulo(lightboxCurrentIdx + 1, l);
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openLightbox(lightboxCurrentPost, target);
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}
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function lightboxPrev() {
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const l = lightboxImages.get(lightboxCurrentPost).length;
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const target = modulo(lightboxCurrentIdx - 1, l);
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openLightbox(lightboxCurrentPost, target);
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}
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function constructLightbox() {
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const dialog = document.createElement("dialog");
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dialog.classList.add("lightbox-dialog");
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dialog.addEventListener("click", (e) => {
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if (e.target === dialog) {
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dialog.close();
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}
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})
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const dialogInner = document.createElement("div");
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dialogInner.classList.add("lightbox-inner");
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dialog.appendChild(dialogInner);
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const img = document.createElement("img");
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img.classList.add("lightbox-image")
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dialogInner.appendChild(img);
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const openOriginalAnchor = document.createElement("a")
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openOriginalAnchor.text = "Open original in new window"
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openOriginalAnchor.target = "_blank"
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openOriginalAnchor.rel = "noopener noreferrer nofollow"
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dialogInner.appendChild(openOriginalAnchor);
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const navSpan = document.createElement("span");
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navSpan.classList.add("lightbox-nav");
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const prevButton = document.createElement("button");
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prevButton.type = "button";
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prevButton.textContent = "Previous";
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prevButton.addEventListener("click", lightboxPrev);
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const nextButton = document.createElement("button");
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nextButton.type = "button";
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nextButton.textContent = "Next";
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nextButton.addEventListener("click", lightboxNext);
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const imageCount = document.createElement("span");
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imageCount.textContent = "Image of ";
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navSpan.appendChild(prevButton);
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navSpan.appendChild(imageCount);
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navSpan.appendChild(nextButton);
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dialogInner.appendChild(navSpan);
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return {
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img: img,
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dialog: dialog,
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openOriginalAnchor: openOriginalAnchor,
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prevButton: prevButton,
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nextButton: nextButton,
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imageCount: imageCount,
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}
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}
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let lightboxImages = new Map(); //.post-inner : Array<Object>
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let lightboxObj = null;
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let lightboxCurrentPost = null;
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let lightboxCurrentIdx = -1;
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document.addEventListener("DOMContentLoaded", () => {
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//lightboxes
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lightboxObj = constructLightbox();
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document.body.appendChild(lightboxObj.dialog);
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function setImageMaxSize(img) {
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const {
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maxWidth: origMaxWidth,
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maxHeight: origMaxHeight,
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minWidth: origMinWidth,
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minHeight: origMinHeight,
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} = getComputedStyle(img);
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console.log(img, img.naturalWidth, img.naturalHeight, origMinWidth, origMinHeight, origMaxWidth, origMaxHeight)
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if (img.naturalWidth < parseInt(origMinWidth)) {
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console.log(1)
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img.style.minWidth = img.naturalWidth + "px";
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}
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if (img.naturalHeight < parseInt(origMinHeight)) {
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console.log(2)
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img.style.minHeight = img.naturalHeight + "px";
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}
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if (img.naturalWidth < parseInt(origMaxWidth)) {
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console.log(3)
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img.style.maxWidth = img.naturalWidth + "px";
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}
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if (img.naturalHeight < parseInt(origMaxHeight)) {
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console.log(4)
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img.style.maxHeight = img.naturalHeight + "px";
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}
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}
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const postImages = document.querySelectorAll(".post-inner img.post-image");
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postImages.forEach(postImage => {
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const belongingTo = postImage.closest(".post-inner");
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const images = lightboxImages.get(belongingTo) ?? [];
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images.push({
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src: postImage.src,
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alt: postImage.alt,
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});
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const idx = images.length - 1;
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lightboxImages.set(belongingTo, images);
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postImage.style.cursor = "pointer";
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postImage.addEventListener("click", () => {
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openLightbox(belongingTo, idx);
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});
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});
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const postAndSigImages = document.querySelectorAll("img.post-image");
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postAndSigImages.forEach(image => {
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if (image.complete) {
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setImageMaxSize(image);
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} else {
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image.addEventListener("load", () => setImageMaxSize(image));
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}
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})
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});
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