MetaFilter number all comments

On MetaFilter.com, adds a comment number like "comment 1 of 30" to each comment.
目前为 2019-08-27 提交的版本。查看最新版本。
Wrap lines
// ==UserScript==
// @name        MetaFilter number all comments
// @version     10
// @grant       none
// @match       http://*.metafilter.com/*
// @match       https://*.metafilter.com/*
// @description On MetaFilter.com, adds a comment number like "comment 1 of 30" to each comment.
// @locale      en-us
// @run-at      document-idle
// @namespace   https://gf.qytechs.cn/users/324881
// ==/UserScript==

function addCountToComments() {
  // first, clear all counts in case this runs more than once on a page.
  let allCommentCountSpans = Array.from(document.getElementsByClassName('tehhundUserScriptCommentCount'));
  for (let currentSpan of allCommentCountSpans) { currentSpan.remove(); }

  // then add counts to every comment div.
  let allCommentDivs = document.getElementsByClassName('comments');
  allCommentDivs = Array.from(allCommentDivs).filter( function(div) { return div.previousSibling.tagName == 'A'; }); // Some "comment" divs are not actually comments. All comments, and only comments, are preceeded by an anchor tag. So this filters down to only real comment divs.
  for (let [i,divToHighlight] of allCommentDivs.entries()) {
    divToHighlight.lastChild.innerHTML += '<span class=\'tehhundUserScriptCommentCount\'>Comment ' + (i+1) + ' of ' + allCommentDivs.length + '. </span>';
  }
}

function runIfCommentAdded(mutationsList, observer) { // When a mutation event occurs, check if it was adding a comment and if so renumber the comments.
  for (let mutation of mutationsList) { // Loop over all mutations for this event.
    try {
      if (mutation.target.previousSibling.tagName == 'A') { // If the target's previousSibling is an anchor tag, it's probably an added comment so renumber the comments. Otherwise do nothing.
        addCountToComments();
      }
    } catch(e) { /* previousSibling is null if the mutation was adding a Favorite, and that throws an error on the console every time. This try/catch discards the error. */ }
  }
}

addCountToComments(); // Run once when the page is idle

// After the initial run, observe the main content div for changes such as new comments and run addCountToComments() again.
const mutationObserver = new MutationObserver(runIfCommentAdded);
mutationObserver.observe(document.getElementById('posts'), { attributes: true, childList: true, subtree: true })
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