(() => { const comments = document.querySelector(".comment-tree > tbody"); let selectedComment = comments.firstElementChild selectedComment.style.outline = '1px dashed black'; const visible = (element) => { let bounds = element.getBoundingClientRect(); return bounds.top >= 0 && bounds.bottom <= window.innerHeight; } const changeWithVisibleCallback = (comment, callback) => { if (comment == null) { return; } selectedComment.style.outline = ''; selectedComment = comment; selectedComment.style.outline = '1px dashed black'; if (!visible(comment)) { callback(); } } const change = (comment) => { changeWithVisibleCallback(comment, () => {}); } // Curry callback for moving downpage const changeDownpage = (comment) => { changeWithVisibleCallback(comment, () => {window.scrollTo(0, window.scrollY + comment.offsetHeight)}); } // Curry callback for moving up page const changeUppage = (comment) => { changeWithVisibleCallback(comment, () => {window.scrollTo(0, window.scrollY - comment.offsetHeight)}); } document.addEventListener("click", (e) => { change(e.target.closest("tr.athing")); }) document.addEventListener("keydown", (e) => { if (e.isComposing) { return; } if (e.key == "j") { do { changeDownpage(selectedComment.nextElementSibling); } while (selectedComment.classList.contains("noshow")); } if (e.key == "k") { do { changeUppage(selectedComment.previousElementSibling); } while (selectedComment.classList.contains("noshow")); } if (e.key == "Enter") { let togg = selectedComment.querySelector(".togg"); let more = selectedComment.querySelector(".morelink"); if (togg) { togg.click(); } else if (more) { more.click(); } } }) })();