(() => { const comments = document.querySelectorAll("tr.comtr"); const items = document.querySelectorAll("table.itemlist tr.athing"); const morelink = document.querySelectorAll("a.morelink"); const elements = [ ...Array.from(items), ...Array.from(comments), ...Array.from(morelink), ]; let elementsIndex = 0; let selectedElement = elements[elementsIndex]; selectedElement.style.outline = '1px dashed black'; const visible = (element) => { let bounds = element.getBoundingClientRect(); return Math.abs(bounds.bottom - bounds.top) > window.innerHeight || bounds.top >= 0 && bounds.bottom <= window.innerHeight; } const changeWithVisibleCallback = (comment, callback) => { if (comment == null) { return; } selectedElement.style.outline = ''; selectedElement = comment; selectedElement.style.outline = '1px dashed black'; while (!visible(comment)) { callback(); } } const change = (comment) => { elementsIndex = elements.indexOf(comment); changeWithVisibleCallback(comment, () => {}); } // Curry callback for moving downpage const changeDownpage = () => { elementsIndex = Math.min(elementsIndex + 1, elements.length - 1); changeWithVisibleCallback(elements[elementsIndex], () => {window.scrollTo(0, window.scrollY + selectedElement.offsetHeight)}); } // Curry callback for moving up page const changeUppage = () => { elementsIndex = Math.max(elementsIndex - 1, 0); changeWithVisibleCallback(elements[elementsIndex], () => {window.scrollTo(0, window.scrollY - selectedElement.offsetHeight)}); } document.addEventListener("click", (e) => { change(e.target.closest("tr.athing")); }) document.addEventListener("keydown", (e) => { if (e.target.type === 'textarea' || e.isComposing) { return; } switch (e.key) { case "j": do { changeDownpage(); } while (selectedElement.classList.contains("noshow")); break; case "k": do { changeUppage(); } while (selectedElement.classList.contains("noshow")); break; case "m": case "Enter": let togg = selectedElement.querySelector(".togg"); if (togg) { togg.click(); } else if (elementsIndex == elements.length - 1) { selectedElement.click(); } break; case "o": window.location.href = "https://news.ycombinator.com/item?id=" + selectedElement.id; case "p": while (selectedElement.querySelector("td.ind").firstElementChild.width != 0) { changeUppage(); } break; default: //noop } }) })();