hnim.js

   1 (() => {
   2   const comments = document.querySelector(".comment-tree > tbody");
   3
   4   let selectedComment = comments.firstElementChild
   5   selectedComment.style.outline = '1px dashed black';
   6
   7   const visible = (element) => {
   8     let bounds = element.getBoundingClientRect();
   9     return bounds.top >= 0 && bounds.bottom <= window.innerHeight;
  10   }
  11
  12   const changeWithVisibleCallback = (comment, callback) => {
  13     if (comment == null) {
  14       return;
  15     }
  16     selectedComment.style.outline = '';
  17     selectedComment = comment;
  18     selectedComment.style.outline = '1px dashed black';
  19     if (!visible(comment)) {
  20       callback();
  21     }
  22   }
  23
  24   const change = (comment) => {
  25     changeWithVisibleCallback(comment, () => {});
  26   }
  27
  28   // Curry callback for moving downpage
  29   const changeDownpage = (comment) => {
  30     changeWithVisibleCallback(comment, () => {window.scrollTo(0, window.scrollY + comment.offsetHeight)});
  31   }
  32
  33   // Curry callback for moving up page
  34   const changeUppage = (comment) => {
  35     changeWithVisibleCallback(comment, () => {window.scrollTo(0, window.scrollY - comment.offsetHeight)});
  36   }
  37
  38   document.addEventListener("click", (e) => {
  39     change(e.target.closest("tr.athing"));
  40   })
  41   document.addEventListener("keydown", (e) => {
  42     if (e.isComposing) {
  43       return;
  44     }
  45     if (e.key == "j") {
  46       do {
  47         changeDownpage(selectedComment.nextElementSibling);
  48       } while (selectedComment.classList.contains("noshow"));
  49     }
  50     if (e.key == "k") {
  51       do {
  52         changeUppage(selectedComment.previousElementSibling);
  53       } while (selectedComment.classList.contains("noshow"));
  54     }
  55     if (e.key == "Enter") {
  56       let togg = selectedComment.querySelector(".togg");
  57       let more = selectedComment.querySelector(".morelink");
  58       if (togg) {
  59         togg.click();
  60       }
  61       else if (more) {
  62         more.click();
  63       }
  64     }
  65   })
  66 })();