Download edX course mp4 and srt in one click, and save them as same file name (except the file suffix). <https://github.com/jks-liu/edx-downloader.monkey.js>
// ==UserScript==
// @name edX Downloader
// @name:zh-CN edX网课下载器
// @name:zh-TW edX網課下載器
// @name:ja edXダウンローダー
// @namespace https://github.com/jks-liu/edx-downloader.monkey.js
// @supportURL https://github.com/jks-liu/edx-downloader.monkey.js
// @version 2.0.1
// @description Download edX course mp4 and srt in one click, and save them as same file name (except the file suffix). <https://github.com/jks-liu/edx-downloader.monkey.js>
// @description:zh-CN 一键下载edX网课视频和字幕，并保存为相同的文件名（除了文件后缀）。<https://github.com/jks-liu/edx-downloader.monkey.js>
// @description:zh-TW 一鍵下載edX網課視頻和字幕，並保存爲相同的文件名（除了文件後綴）。<https://github.com/jks-liu/edx-downloader.monkey.js>
// @description:ja edXオンラインコースのビデオと字幕をワンクリックでダウンロードし、同じファイル名で保存します（ファイル拡張子を除く）。<https://github.com/jks-liu/edx-downloader.monkey.js>
// @author Jks Liu (https://github.com/jks-liu)
// @license MIT
// @match https://edx.org/*
// @match https://www.edx.org/*
// @match https://learning.edx.org/*
// @match https://courses.edx.org/*
// @icon https://www.google.com/s2/favicons?domain=edx.com
// @grant GM_download
// @grant GM_setValue
// @grant GM_getValue
// ==/UserScript==
// https://stackoverflow.com/questions/14308588/simple-jquery-selector-only-selects-first-element-in-chrome
// If jQuery isn't present on the webpage, and of course no other code assigns something to $, Chrome's JS console assigns $ a shortcut to document.querySelector().
// You can achieve what you want with $$(), which is assigned by the console a shortcut to document.querySelectorAll().
// TODO: Add real title
// TODO: Download in floder
// TODO: label of already download
// TODO: Process bar
// TODO: Count of current course
// TODO: Download html
// TODO: Auto goto nextpage and download
// jks_ is the namespace
// The structure is as below
// learning.edx.org -> Containing title
// ifram, courses.edx.org -> Containing video address
function jks_is_host(site) {
return window.location.href.indexOf(site) != -1
}
function jks_learning_edu_org() {
'use strict';
// Original page has no jQuery
// $$ can be used in broswer, but not here
// below line from https://github.com/akhodakivskiy/VimFx/issues/841#issuecomment-263197162
const $$ = (...args) => Array.from(document.querySelectorAll(...args));
var checkExist = setInterval(function() {
let all_titles = $$("ol.list-unstyled a");
let all_buttons = $$("div.sequence-navigation-tabs > button");
if (all_titles.length && all_buttons.length) {
clearInterval(checkExist);
/// Get course meta data
let course_name = all_titles[1].text;
let paragraph_name = all_titles[2].text;
let all_sections = all_buttons.map(button=>button.title);
let active_section_index = all_buttons.findIndex(button=>button.classList.contains("active"));
let active_section = all_sections[active_section_index];
console.log("jks edx names", course_name, paragraph_name, active_section);
GM_setValue("names", [course_name, paragraph_name, active_section, active_section_index]);
/// Register action to detect meta data change
let class_context = $$("div.sequence-navigation-tabs")[0];
// https://stackoverflow.com/questions/38861601/how-to-only-trigger-parent-click-event-when-a-child-is-clicked/38861760
class_context.addEventListener('click', function(event) {
let button = event.target;
while (button.nodeName != "BUTTON") {
button = button.parentElement;
}
let new_section = button.title;
let new_section_index = all_buttons.findIndex(b => b===button);
GM_setValue("names", [course_name, paragraph_name, new_section, new_section_index]);
}, true);
}
}, 100); // check every 100ms
}
function jks_courses_edx_org() {
'use strict';
// Original page has jQuery
// The content is under an iframe
// So @match is https://courses.edx.org, not https://learning.edx.org
// Can not use `window.$` as below ajax, don't know why
let video = $('.video-download-button')[0];
let video_url = video.href;
// Create a button
let download_all_button = document.createElement("div");
download_all_button.innerHTML = `
<label>
<input id="jks_checkbox_mp4" type="checkbox", checked=true>
<span>*.mp4</span>
<input id="jks_checkbox_srt" type="checkbox", checked=true>
<span>*.srt</span>
<input id="jks_checkbox_txt" type="checkbox">
<span>*.txt</span>
</label>
<button id="jks_button">Download All</button>
<form>
<label for="jks_input_folder">Folder</label>
<input type="text" id="jks_input_folder" name="jks_input_folder" size="72">
<label for="jks_input_mp4">*.mp4 location:</label>
<input type="text" id="jks_input_mp4" name="jks_input_mp4" size="72">
<label for="jks_input_srt">*.srt location:</label>
<input type="text" id="jks_input_srt" name="jks_input_srt" size="72">
<label for="jks_input_txt">*.txt location:</label>
<input type="text" id="jks_input_txt" name="jks_input_txt" size="72">
</form>
`;
// Video download event is at parent element
// So add button after parent, or it's button click will be hide by parent
// Add 2 other parentElement to widen input box
video.parentElement.parentElement.parentElement.append(download_all_button)
// Cannot use $, don't know why
let srt_url = document.querySelector("li.transcript-option a").href;
// Use $ instead of window.$, previously window.$ is ok, don't know why
$.ajax({
url: document.querySelector("li.transcript-option a").href,
type: "HEAD",
success: function(res, status, xhr) {
let srt_header = xhr.getResponseHeader("content-disposition");
// attachment; filename="02_TinyML_C02_03-01-01-en.srt" => 02_TinyML_C02_03-01-01-en.srt
// let srt_file_name = srt_header.slice(22, -1);
// let mp4_file_name = srt_file_name.slice(0, -4)+".mp4";
// let txt_file_name = srt_file_name.slice(0, -4)+".txt";
let names = GM_getValue("names", ["edx-unknown-course", "edx-unknown-paragraph", "edx-unknown-section"]);
let folder_name = names[0]+"/"+names[1]
let base_name = String(names[3]).padStart(2, "0")+"-"+names[2];
let mp4_file_name = base_name + ".mp4";
let srt_file_name = base_name + ".srt";
let txt_file_name = base_name + ".txt";
$("#jks_input_folder")[0].value = folder_name;
$("#jks_input_mp4")[0].value = mp4_file_name;
$("#jks_input_srt")[0].value = srt_file_name;
$("#jks_input_txt")[0].value = txt_file_name;
$("#jks_button").click(function() {
if ($("#jks_checkbox_mp4")[0].checked) {
// video is CORS (Cross-origin resource)
// Set tampermonkey `Download Mode` option to `Browser API`
// https://www.tampermonkey.net/faq.php?ext=dhdg#Q302
GM_download(video_url, $("#jks_input_folder")[0].value+"/"+$("#jks_input_mp4")[0].value);
}
if ($("#jks_checkbox_srt")[0].checked) {
GM_download(srt_url, $("#jks_input_folder")[0].value+"/"+$("#jks_input_srt")[0].value);
}
if ($("#jks_checkbox_txt")[0].checked) {
// Txt and srt and the same file
GM_download(srt_url, $("#jks_input_folder")[0].value+"/"+$("#jks_input_txt")[0].value);
}
})
}
})
}
(function() {
'use strict';
if (jks_is_host("courses.edx.org")) {
jks_courses_edx_org();
}
if (jks_is_host("learning.edx.org")) {
jks_learning_edu_org();
}
})();