138 lines
4.1 KiB
JavaScript
138 lines
4.1 KiB
JavaScript
// Here we are making iframes responsive. Particularly useful for inline Youtube videos.
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function wrapFrames() {
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document.querySelectorAll("iframe").forEach(element => {
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if (element.height > 0 || parseInt(element.style.height) > 0)
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return;
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var wrapper = document.createElement("div");
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wrapper.classList.add("iframeWrap");
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element.parentNode.insertBefore(wrapper, element);
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wrapper.appendChild(element);
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});
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}
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// Strip out color and font styling
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function stripStylesFromElement(element, propertiesToStrip) {
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for (name of propertiesToStrip) {
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element.style.removeProperty(name);
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}
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}
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function stripStyles() {
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document.getElementsByTagName("body")[0].querySelectorAll("style, link[rel=stylesheet]").forEach(element => element.remove());
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// Removing "background" and "font" will also remove properties that would be reflected in them, e.g., "background-color" and "font-family"
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document.getElementsByTagName("body")[0].querySelectorAll("[style]").forEach(element => stripStylesFromElement(element, ["color", "background", "font", "max-width", "max-height"]));
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}
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// Convert all Feedbin proxy images to be used as src, otherwise change image locations to be absolute if not already
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function convertImgSrc() {
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document.querySelectorAll("img").forEach(element => {
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if (element.hasAttribute("data-canonical-src")) {
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element.src = element.getAttribute("data-canonical-src")
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} else if (!element.src.match(/^[a-z]+\:\/\//i)) {
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element.src = new URL(element.src, document.baseURI).href;
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}
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});
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}
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// Wrap tables in an overflow-x: auto; div
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function wrapTables() {
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var tables = document.querySelectorAll("div.articleBody table");
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for (table of tables) {
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var wrapper = document.createElement("div");
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wrapper.className = "nnw-overflow";
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table.parentNode.insertBefore(wrapper, table);
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wrapper.appendChild(table);
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}
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}
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// Add the playsinline attribute to any HTML5 videos that don"t have it.
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// Without this attribute videos may autoplay and take over the whole screen
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// on an iphone when viewing an article.
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function inlineVideos() {
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document.querySelectorAll("video").forEach(element => {
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element.setAttribute("playsinline", true)
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element.setAttribute("controls", true)
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});
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}
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// Remove some children (currently just spans) from pre elements to work around a strange clipping issue
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var ElementUnwrapper = {
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unwrapSelector: "span",
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unwrapElement: function (element) {
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var parent = element.parentNode;
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var children = Array.from(element.childNodes);
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for (child of children) {
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parent.insertBefore(child, element);
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}
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parent.removeChild(element);
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},
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// `elements` can be a selector string, an element, or a list of elements
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unwrapAppropriateChildren: function (elements) {
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if (typeof elements[Symbol.iterator] !== 'function')
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elements = [elements];
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else if (typeof elements === "string")
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elements = document.querySelectorAll(elements);
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for (element of elements) {
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for (unwrap of element.querySelectorAll(this.unwrapSelector)) {
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this.unwrapElement(unwrap);
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}
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element.normalize()
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}
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}
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};
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function flattenPreElements() {
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ElementUnwrapper.unwrapAppropriateChildren("div.articleBody td > pre");
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}
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function reloadArticleImage(imageSrc) {
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var image = document.getElementById("nnwImageIcon");
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image.src = imageSrc;
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}
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function stopMediaPlayback() {
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document.querySelectorAll("iframe").forEach(element => {
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var iframeSrc = element.src;
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element.src = iframeSrc;
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});
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document.querySelectorAll("video, audio").forEach(element => {
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element.pause();
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});
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}
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function error() {
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document.body.innerHTML = "error";
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}
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// Takes into account absoluting of URLs.
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function isLocalFootnote(target) {
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return target.hash.startsWith("#fn") && target.href.indexOf(document.baseURI) === 0;
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}
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function styleLocalFootnotes() {
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for (elem of document.querySelectorAll("sup > a[href*='#fn'], sup > div > a[href*='#fn']")) {
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if (isLocalFootnote(elem)) {
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elem.classList.add("footnote");
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}
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}
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}
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function processPage() {
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wrapFrames();
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wrapTables();
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inlineVideos();
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stripStyles();
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convertImgSrc();
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flattenPreElements();
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styleLocalFootnotes();
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postRenderProcessing();
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}
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