FBTitle Fix のソースコード

FBTitle Fix

Replaces generic Facebook tab title with the actual page or group name
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// ==UserScript==
// @name         FBTitle Fix
// @namespace    https://github.com/2u841r/FBTitle-Fix
// @version      1.0.0
// @description  Replaces generic Facebook tab title with the actual page or group name
// @author       Zubair Ibn Zamir
// @license      MIT 
// @match        *://*.facebook.com/*
// @grant        none
// @run-at       document-idle
// ==/UserScript==

(function () {
  'use strict';

  function getPageName() {
    const h1btn = document.querySelector('h1 div[role="button"]');
    if (h1btn) {
      const text = h1btn.childNodes[0]?.textContent?.trim();
      if (text) return text;
    }
    const h1 = document.querySelector('h1');
    if (h1) {
      const text = h1.textContent?.trim();
      if (text) return text;
    }
    return null;
  }

  function updateTitle() {
    const name = getPageName();
    if (name && !document.title.startsWith(name)) {
      document.title = name + ' | Facebook';
    }
  }

  const observer = new MutationObserver(() => updateTitle());
  observer.observe(document.body, { childList: true, subtree: true });

  const _pushState = history.pushState.bind(history);
  history.pushState = function (...args) {
    _pushState(...args);
    setTimeout(updateTitle, 500);
  };

  window.addEventListener('popstate', () => setTimeout(updateTitle, 500));

  updateTitle();
})();