Rotten Tomatoes Links for Jellyfin user script

Rotten Tomatoes Links-2025-09-07.user.js

// ==UserScript==
// @name         Rotten Tomatoes Links for Jellyfin
// @namespace    http://stpettersen.xyz
// @version      2025-09-07
// @description  This script adds a Rotten Tomatoes link for TV and movies on Jellyfin.
// @author       Sam Saint-Pettersen
// @match        https://jfdemo.stpettersen.xyz/*
// @icon         https://www.rottentomatoes.com/assets/pizza-pie/images/favicon.ico
// @grant        none
// ==/UserScript==

(function() {
    // Replace @match with your Jellyfin server URL.
    'use strict';

    function waitForElement(selector, targetNode = document.body) {
        return new Promise((resolve) => {
            const element = document.querySelector(selector);
            if (element) {
                return resolve(element);
            }

            const observer = new MutationObserver(() => {
            const foundElement = document.querySelector(selector);
            if (foundElement) {
                observer.disconnect();
                resolve(foundElement);
            }
    });

    observer.observe(targetNode, {
      childList: true,
      subtree: true
    });
  });
}

function injectRTLink() {
    console.log("RTLfJF: injectRTLink invoked; inserting link.");
    let targetEl = null;
    let links = document.getElementsByClassName('button-link')
    for (let i = 0; i < links.length; i++) {
        if (links[i].href.startsWith("https://www.themoviedb.org")) {
            targetEl = links[i];
            break;
        }
        if (targetEl != null) {
            break;
        }
    }
    let genre = "m";
    let year = "";
    let title = document.getElementsByTagName("bdi")[0].innerHTML.toLowerCase()
    .replace(/ /g,"_").replace(/'/g,"").replace(/_&amp;/g, "").replace(/:/g, "").replace(/,/g, "").replace(/-/g, "_");
    let otm = document.getElementsByClassName("originalTitle")[0];
    if (otm) {
        let ot = document.getElementsByClassName("originalTitle")[0].innerHTML;
        if (ot.length > 0) year = "_" + ot;
    }
    let ott = document.getElementsByClassName("originalTitle")[0];
    if (ott) {
        let ot = document.getElementsByClassName("originalTitle")[0].innerHTML;
        if (ot == "TV") genre = "tv";
    }
    targetEl.insertAdjacentHTML("afterend",
    `, <a id="rt-link" target="_blank" class="button-link emby-button" href="https://www.rottentomatoes.com/${genre}/${title}${year}">Rotten Tomatoes</a>`
    .replace("_TV", ""));
}

// Wait for bottom cards to load before attempting to get/insert links.
waitForElement('.card').then(element => {
    console.log("RTLfJF: Title cards loaded...");
    injectRTLink();
});
})();