SCP Foundation: Add names to details pages: Adds the descriptive names from the SCP series index page to the individual detail pages, and provides previous and next buttons to navigate through SCPs.

scp_foundation_add_names.user.js

// ==UserScript==
// @name           SCP Foundation: Add names to details pages
// @namespace      https://gist.github.com/ksemel/3e189fef865a02ee9956
// @description    Adds the descriptive names from the SCP series index page to the individual detail pages, and provides previous and next buttons to navigate through SCPs.
// @author         Katherine Semel
// @date           2011-09-02
// @revision       2021-03-07
// @version        3.0
// @include        /(?:scp-wiki\.wikidot\.com)\/(?:adult:)?(scp-[0-9]+)/
// @grant          GM_xmlhttpRequest
// ==/UserScript==

function addScripts(pageContent) {
  // Add the scripts to the document
  let script = document.createElement("script");
  script.type = 'text/javascript';
  script.textContent = updateSCPDisplay.toString();
  script.textContent += getSCPname.toString();
  document.head.appendChild(script);
}

/*
  Get the SCP name from the series page content that we fetched initially
  TODO: Fails on "new page" links
  TODO: Fails on first/last entry between series
*/
function getSCPname(thisSCP, pageContent) {
  let newtitle = '';
  //console.log('FIND SCP: ' + thisSCP);

  // Grab the text following the /scp-000 reference...
  const startSearch = '<li><a href="/scp-' + thisSCP + '">SCP-' + thisSCP + '</a> - ';
  const endSearch = '</li>';
  const startFind = pageContent.indexOf(startSearch);
  if (startFind > 0) {
    // ...up to the end of the LI
    const endFind = pageContent.indexOf(endSearch, startFind);
    // Title is between those indexes
    newtitle = 'SCP-' + thisSCP + ': ' + pageContent.substring(startFind + startSearch.length, endFind);
  } else {
    // Return a placeholder title when failing
    newtitle = 'SCP-' + thisSCP + ': ACCESS DENIED';
  }
  return newtitle;
}

/*
  Fetch SCP names and make our HTML changes to add them to the pages
*/
function updateSCPDisplay(pageContent, scpDomain, thisSCP) {
  // handle a few formatting differences by adding a title div to pages missing one
  if (document.getElementById('page-title') == null) {
    let pageTitle = document.createElement("div");
    pageTitle.setAttribute('id', 'page-title');
    document.getElementById('action-area-top').parentNode.insertBefore(pageTitle, document.getElementById('action-area-top').nextSibling);
  }

  // Get the next and previous SCPs from the current
  thisSCP = thisSCP.toString().padStart(3, '0');
  const thisSCPtitle = getSCPname(thisSCP, pageContent);

  // Replace the <title>
  document.title = 'The SCP Foundation: ' + thisSCPtitle;
  // Replace the page-title with the cleaned up contents
  document.getElementById('page-title').innerHTML = thisSCPtitle;
  let script = document.createElement("div");
  script.setAttribute('style', 'width:100%;height:50px;');

  // Do we have a Next link?
  let nextSCP = parseInt(thisSCP, 10) + 1;
  let nextSCPlink = "";
  if (nextSCP < 6000) {
    nextSCP = nextSCP.toString().padStart(3, '0');
    const nextSCPtitle = getSCPname(nextSCP, pageContent);
    nextSCPlink = '<a href="' + scpDomain + '/scp-' + nextSCP + '" title="' + nextSCPtitle + '">' + nextSCPtitle + '&nbsp;&raquo;</a>';
    script.innerHTML = '<div style="float:right">' + nextSCPlink + '</div>'
  }

  // Do we have a Previous link?
  let prevSCP = parseInt(thisSCP, 10) - 1;
  let prevSCPlink = "";
  if (prevSCP > 0) {
    prevSCP = prevSCP.toString().padStart(3, '0');
    const prevSCPtitle = getSCPname(prevSCP, pageContent);
    prevSCPlink = '<a href="' + scpDomain + '/scp-' + prevSCP + '" title="' + prevSCPtitle + '">&laquo;&nbsp;' + prevSCPtitle + '</a>';
    script.innerHTML += '<div style="float:left">' + prevSCPlink + '</div>';
  }

  // Add the links under the title
  document.getElementById('page-title').parentNode.insertBefore(script, document.getElementById('page-title').nextSibling);
  document.getElementById('page-title').style.display = 'block';
}

/*
  Kick it off with some RegEx on the url
*/
const thisURL = document.location.href;
// RegEx Builder: https://regex101.com/r/hHMfy6/1
// Returns scpDomain as match 1
// Returns thisSCP as match 2
let regex = /^((?:https|http):\/\/scp-wiki\.wikidot\.com)\/(?:adult:)?(scp-[0-9]+)/g
let match = regex.exec(thisURL);
const scpDomain = match[1];
const thisSCP = match[2].replace('scp-', '');

// Which series? Now vaguely futureproof!
let series = '';
if (thisSCP > 999) {
  series = parseInt(thisSCP.toString()[0]) + 1;
  series = '-' + series;
}

// Request the series page
GM_xmlhttpRequest({
  method: "GET",
  url: scpDomain + "/scp-series" + series,
  onload: function(response) {
    // Add our scripts to the head
    addScripts();
    // Run the updates
    updateSCPDisplay(response.responseText, scpDomain, thisSCP);
  }
});

The latest version accounts for more differences on the pages and the potential for additional series.

Fetches the SCP titles more consistently, and adds the page title container on pages that lack it.

Standard Page:

New SCP Page (no scp yet)

Custom Designed Page: