nHentai Downloader

Download manga on nHentai.net

You will need to install an extension such as Tampermonkey, Greasemonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Violentmonkey to install this script.

You will need to install an extension such as Tampermonkey or Userscripts to install this script.

You will need to install an extension such as Tampermonkey to install this script.

You will need to install a user script manager extension to install this script.

(I already have a user script manager, let me install it!)

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install an extension such as Stylus to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

You will need to install a user style manager extension to install this style.

(I already have a user style manager, let me install it!)

// ==UserScript==
// @name         nHentai Downloader
// @namespace    https://holy-donkey.github.io
// @description  Download manga on nHentai.net
// @version      1.2.1
// @icon         http://i.imgur.com/FAsQ4vZ.png
// @author       The Holy Donkey
// @license      MIT
// @match        http://nhentai.net/g/*
// @match        https://nhentai.net/g/*
// @require      https://cdn.jsdelivr.net/jquery/2.2.4/jquery.min.js
// @require      https://cdn.jsdelivr.net/jszip/3.1.3/jszip.min.js
// @require      https://cdn.jsdelivr.net/filesaver.js/1.3.3/FileSaver.min.js
// @noframes
// @connect      self
// @supportURL   https://github.com/holy-donkey/UserScripts/issues
// @run-at       document-idle
// @grant        GM_xmlhttpRequest
// ==/UserScript==

jQuery(function($) {
    'use strict';

    function deferredAddZip(i, filename) {
        var deferred = $.Deferred();

        GM_xmlhttpRequest({
            method: 'GET',
            url: images[i],
            responseType: 'arraybuffer',
            onload: function(response) {
                zip.file(filename, response.response);
                $download.html('<i class="fa fa-cog fa-spin"></i> ' + (++current) + '/' + total);
                deferred.resolve(response);
            },
            onerror: function(err) {
                console.error(err);
                deferred.reject(err);
            }
        });

        return deferred;
    }

    var zip = new JSZip(),
        prevZip = false,
        deferreds = [],
        current = 0,
        total = 0,
        images = [],
        $download = $('#download'),
        doc = document,
        tit = doc.title;

    window.URL = window.URL || window.webkitURL;

    $download.one('click', function(e) {
        e.preventDefault();

        $download.attr('href', '#download');

        $(window).on('beforeunload', function() {
            return 'Progress is running...';
        });

        $download.html('<i class="fa fa-cog fa-spin"></i> Waiting...').css('backgroundColor', 'orange');

        $('.lazyload').each(function(i, v) {
            images[i] = location.protocol + $(v).attr('data-src').replace('t.n', 'i.n').replace(/\/(\d+)t\./, '/$1.');
        });

        total = images.length;

        $.each(images, function(i, v) {
            var filename = v.replace(/.*\//g, '');

            deferreds.push(deferredAddZip(i, filename));
        });

        $.when.apply($, deferreds).done(function() {
            zip.generateAsync({
                type: 'blob'
            }).then(function(blob) {
                var zipName = tit.split(' » ')[0].replace(/\s/g, '_') + '.zip';

                if (prevZip) {
                    window.URL.revokeObjectURL(prevZip);
                }
                prevZip = blob;

                $download.html('<i class="fa fa-check"></i> Complete').css('backgroundColor', 'green').attr({
                    href: window.URL.createObjectURL(prevZip),
                    download: zipName
                });

                saveAs(blob, zipName);

                doc.title = '[⇓] ' + tit;
            }, function(reason) {
                 console.error(reason);
            });
        }).fail(function(err) {
            $download.html('<i class="fa fa-exclamation"></i> Fail').css('backgroundColor', 'red');
            console.error(err);
        }).always(function() {
            $(window).off('beforeunload');
        });

    });

});