adds a "Random Work" button (top right corner) when viewing works or bookmarks - shows up in a tag/filter and your Marked For Later list
// ==UserScript==
// @name AO3: Jump to a Random Work
// @namespace https://greasyfork.org/en/users/906106-escctrl
// @version 1.1
// @description adds a "Random Work" button (top right corner) when viewing works or bookmarks - shows up in a tag/filter and your Marked For Later list
// @author escctrl
// @match *://*.archiveofourown.org/tags/*/works*
// @match *://*.archiveofourown.org/works?*
// @match *://*.archiveofourown.org/users/*/readings*show=to-read*
// @match *://*.archiveofourown.org/tags/*/bookmarks*
// @match *://*.archiveofourown.org/bookmarks?*
// @match *://*.archiveofourown.org/users/*/bookmarks*
// @grant none
// @license MIT
// ==/UserScript==
'use strict';
// utility to reduce verboseness
const q = (s, n=document) => n.querySelector(s);
const qa = (s, n=document) => n.querySelectorAll(s);
// add a button
var button = document.createElement('li');
button.innerHTML = '<a href="#">Random Work</a>';
button.addEventListener("click", RandomWork);
q('div#main ul.navigation.actions').appendChild(button);
// when the button was pressed, read the number of works, pick a random one, and redirect there
function RandomWork(e) {
e.preventDefault();
// Find number of pages. content of second-to-last <li> tells us
let pageCount = q('ol.pagination');
pageCount = pageCount !== null ? parseInt([...qa('li', pageCount)].at(-2).innerText) : 1;
// pick random whole number of the available pages
const pageRandom = Math.floor((Math.random() * pageCount) + 1);
// figure out which page we're currently viewing
var thisPage = location.search.match(/page=(\d+)/);
thisPage = thisPage === null ? 1 : parseInt(thisPage[1]); // match only works if URL contained a page (i.e. if not on page 1)
// check: are we currently on the randomly chosen page?
if (thisPage !== pageRandom) LoadRandomPage(pageRandom); // if not - read that page to find a random work link
else Redirect2Work(qa('ol.index.group > li.blurb')); // if yes - skip page loads, read a random work link from this page
}
async function LoadRandomPage(r) {
// build the URL of the page to load
var pageURL = location.search.indexOf('page=') > 0 ? location.href.replace(/page=(\d+)/, 'page='+r) // replace existing page number
: location.href + (location.href.indexOf('?') > 0 ? '&' : '?') + 'page='+r; // add page number if not yet in URL search parameters
try {
let response = await fetch(pageURL);
// the response has hit an error eg. 429 retry later
if (!response.ok) throw new Error(`Random Work script HTTP error: ${response.status}`);
else {
let txt = await response.text();
let parser = new DOMParser(); // Initialize the DOM parser
txt = parser.parseFromString(txt, "text/html"); // Parse the text into HTML
Redirect2Work(qa('ol.index.group > li.blurb', txt));
}
}
catch(error) {
console.error("Random Work script error", error.message);
alert("Sorry, the Random Work script encountered an error. You've probably been rate-limited. Please try again later.");
return false;
}
}
function Redirect2Work(worksList) {
// pick a random work from within the list
var pick = Math.floor((Math.random() * worksList.length) + 1);
// read that random work's URL and title
pick = q('h4 a', worksList[pick-1]);
// jump to that work but warn the user
alert('Redirecting you to a random work: '+pick.innerText);
window.location.assign(pick.href);
}