Load nhentai gallery images vertically with API + fallback extension support, fixed fallback logic
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// ==UserScript==
// @name Infinite Scroll
// @namespace http://tampermonkey.net/
// @version 1.1
// @description Load nhentai gallery images vertically with API + fallback extension support, fixed fallback logic
// @author Duc Anh
// @match https://nhentai.net/g/*/
// @require https://code.jquery.com/jquery-3.5.1.min.js
// @grant none
// ==/UserScript==
(function() {
'use strict';
const bigcontainer = $('.thumbs');
if (!bigcontainer.length) return;
function getBaseURL() {
let start = "https://i";
let maxI = 4;
let randomI = Math.floor(Math.random() * maxI) + 1;
let end = ".nhentai.net/galleries/";
return start + randomI + end;
}
let id = location.pathname.split("/")[2];
fetch("https://nhentai.net/api/gallery/" + id)
.then(response => {
if (!response.ok) {
throw new Error("Could not get page's data!");
}
return response.json();
})
.then(jsonData => {
let mediaCode = jsonData.media_id;
let numPages = jsonData.num_pages;
let baseUrl = getBaseURL() + mediaCode + "/";
// Clear old grid
bigcontainer.empty();
bigcontainer.css({
'display': 'flex',
'flex-direction': 'column',
'align-items': 'center',
'gap': '20px',
'padding': '20px',
'background': '#111'
});
// Insert images one by one
for (let i = 1; i <= numPages; i++) {
let img = document.createElement('img');
let fallbacks = [
baseUrl + i + ".webp",
baseUrl + i + ".jpg",
baseUrl + i + ".png",
baseUrl + i + ".gif"
];
let fallbackIndex = 0;
img.onerror = function() {
fallbackIndex++;
if (fallbackIndex < fallbacks.length) {
this.src = fallbacks[fallbackIndex];
}
};
// Append BEFORE setting src to ensure it shows even if first fails
bigcontainer.append(img);
// Set the initial src AFTER appending and onerror
img.src = fallbacks[fallbackIndex];
img.style.maxWidth = '90%';
img.style.boxShadow = '0 0 10px rgba(0,0,0,0.5)';
img.loading = 'lazy';
}
})
.catch(error => {
console.error("nHentai Vertical Scroll: ", error);
});
})();