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Adds button for loading the previous video in a YT playlist
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// ==UserScript==
// @name Play Youtube playlist in reverse order
// @namespace https://github.com/Dragosarus/Userscripts/
// @version 4.2
// @description Adds button for loading the previous video in a YT playlist
// @author Dragosarus
// @match http*://www.youtube.com/*
// @grant none
// @require http://code.jquery.com/jquery-latest.js
// ==/UserScript==
// Cookies (current session):
// pytplir_playPrevious - saves the button state between loads
/* NOTES:
* - If the button is not displayed (but the script is running), pause and unpause the video.
* - If it still does not appear, reload the page.
* - If the button is displayed but does not work properly/consistently, increase the value of redirectWhenTimeLeft.
*/
(function() {
'use strict';
$(document).ready(function() {
// Determines when to load the next video.
// Increase these if the redirect does not work as intended (i.e. fails to override Youtube's redirect),
// Decreasing these will let you see more of the video before it redirects, but the redirect might stop working (consistently)
var redirectWhenTimeLeft = 0.3; // seconds before end of video
var redirectWhenTimeLeft_miniplayer = 0.6;
var activeColor = "rgb(64,166,255)";
var inactiveColor = "rgb(144,144,144)";
var circleColor = "rgb(144,144,144)";
var ttBGColor = "rgb(100,100,100)";
var ttTextColor = "rgb(237,240,243)";
var player;
var playPrevious;
var ytdApp = $("ytd-app")[0];
var redirectFlag = false;
var vidNum; // string
var shuffle;
var miniplayerFlag = false; // keep track of switches between miniplayer and normal mode
// create button
var btn_div = document.createElement("div");
var bg_circle = document.createElementNS("http://www.w3.org/2000/svg","circle");
var bg_circle_anim = document.createElementNS("http://www.w3.org/2000/svg","animate");
var arrow_up = document.createElementNS("http://www.w3.org/2000/svg","polygon");
var arrow_down = document.createElementNS("http://www.w3.org/2000/svg","polygon");
var btn_svg = document.createElementNS("http://www.w3.org/2000/svg","svg");
var tt_svg = document.createElementNS("http://www.w3.org/2000/svg","svg");
var tt_svg_fadein = document.createElementNS("http://www.w3.org/2000/svg","animate");
var tt_svg_fadeout = document.createElementNS("http://www.w3.org/2000/svg","animate");
var tt_rect = document.createElementNS("http://www.w3.org/2000/svg","rect");
var tt_text = document.createElementNS("http://www.w3.org/2000/svg","text");
var tt_div = document.createElement("div");
bg_circle_anim.setAttribute("attributeName","fill-opacity");
bg_circle_anim.setAttribute("values","0;0.1;0.2;0.1;0.0");
bg_circle_anim.setAttribute("dur","0.3s");
bg_circle_anim.setAttribute("restart","always");
bg_circle_anim.setAttribute("repeatCount","1");
bg_circle_anim.setAttribute("begin","indefinite");
bg_circle_anim.setAttribute("id","pytplir_bg_circle_anim");
bg_circle.setAttribute("cx","20");
bg_circle.setAttribute("cy","20");
bg_circle.setAttribute("r","20");
bg_circle.setAttribute("fill",circleColor);
bg_circle.setAttribute("fill-opacity","0");
bg_circle.appendChild(bg_circle_anim);
arrow_up.setAttribute("points","17,19 17,17 13,17 20,11 27,17 23,17 23,19");
arrow_up.setAttribute("id","pytplir_arrow_up");
arrow_down.setAttribute("points","17,21 17,23 13,23 20,29 27,23 23,23 23,21");
arrow_down.setAttribute("id","pytplir_arrow_down");
btn_svg.setAttribute("viewbox","0 0 40 40");
btn_svg.setAttribute("xmlns","http://www.w3.org/2000/svg");
btn_svg.setAttribute("width","40");
btn_svg.setAttribute("height","40");
btn_svg.setAttribute("style","cursor: pointer; margin-left: 8px;");
btn_svg.setAttribute("id","pytplir_btn");
btn_svg.appendChild(bg_circle);
btn_svg.appendChild(arrow_up);
btn_svg.appendChild(arrow_down);
tt_rect.setAttribute("x","0");
tt_rect.setAttribute("y","0");
tt_rect.setAttribute("rx","2");
tt_rect.setAttribute("ry","2");
tt_rect.setAttribute("width","110");
tt_rect.setAttribute("height","34");
tt_rect.setAttribute("fill",ttBGColor);
tt_rect.setAttribute("fill-opacity","0.9");
tt_text.setAttribute("x","8");
tt_text.setAttribute("y","22");
tt_text.setAttribute("font-family","Roboto, Noto, sans-serif");
tt_text.setAttribute("font-size","13px");
tt_text.setAttribute("fill",ttTextColor);
tt_text.setAttribute("style","user-select:none;");
tt_text.innerHTML = "Autoplay order";
tt_svg_fadein.setAttribute("attributeType","CSS");
tt_svg_fadein.setAttribute("attributeName","opacity");
tt_svg_fadein.setAttribute("values","0;1");
tt_svg_fadein.setAttribute("dur","0.1s");
tt_svg_fadein.setAttribute("restart","always");
tt_svg_fadein.setAttribute("repeatCount","1");
tt_svg_fadein.setAttribute("begin","indefinite");
tt_svg_fadein.setAttribute("id","pytplir_tt_fadein");
tt_svg_fadein.setAttribute("fill","freeze");
tt_svg_fadeout.setAttribute("attributeType","CSS");
tt_svg_fadeout.setAttribute("attributeName","opacity");
tt_svg_fadeout.setAttribute("values","1;0");
tt_svg_fadeout.setAttribute("dur","0.1s");
tt_svg_fadeout.setAttribute("restart","always");
tt_svg_fadeout.setAttribute("repeatCount","1");
tt_svg_fadeout.setAttribute("begin","indefinite");
tt_svg_fadeout.setAttribute("id","pytplir_tt_fadeout");
tt_svg_fadeout.setAttribute("fill","freeze");
tt_svg.setAttribute("viewbox","0 0 100 34");
tt_svg.setAttribute("xmlns","http://www.w3.org/2000/svg");
tt_svg.setAttribute("width","100");
tt_svg.setAttribute("height","34");
var tt_svg_offset = "position:absolute; top:13px; left:-32px; z-index:100; opacity:0.0;";
tt_svg.setAttribute("style","padding-left: 10px; fill:" + ttBGColor + "; " + tt_svg_offset);
tt_svg.setAttribute("id","pytplir_tt");
tt_svg.appendChild(tt_rect);
tt_svg.appendChild(tt_text);
tt_svg.appendChild(tt_svg_fadein);
tt_svg.appendChild(tt_svg_fadeout);
tt_div.setAttribute("style", "position:relative; width:0; height:0;");
tt_div.appendChild(tt_svg);
btn_div.setAttribute("id","pytplir_div");
btn_div.appendChild(btn_svg);
btn_div.appendChild(tt_div);
$(btn_svg).on("click",onButtonClick);
$(btn_svg).on("click",function(){$(this).parent().find("#pytplir_bg_circle_anim")[0].beginElement();});
$(btn_svg).on("mouseenter",function(){$(this).parent().find("#pytplir_tt_fadein")[0].beginElement();});
$(btn_svg).on("mouseleave",function(){$(this).parent().find("#pytplir_tt_fadeout")[0].beginElement();});
init();
function init() {
// the button needs to be re-added whenever the playlist is updated (e.g when a video is loaded or removed)
function observerCallback(mutationList, observer) {
start();
}
const playlistObserver = new MutationObserver(observerCallback);
var playlist = $("#playlist");
$("ytd-playlist-panel-renderer[id='playlist']").each(function(){
playlistObserver.observe(this,{subtree:true,childList:true});
});
playPrevious = getCookie("pytplir_playPrevious");
if (playPrevious === "") { // cookie has not been set yet
playPrevious = false; // inital state
setCookie("pytplir_playPrevious",playPrevious);
}
setTimeout(start, 500);
}
function onButtonClick() { // toggle
playPrevious = !playPrevious;
setCookie("pytplir_playPrevious",playPrevious);
updateButtonState();
}
function addButton() {
withQuery(".ytd-playlist-panel-renderer > div[id=top-level-buttons]", "*", function(res) {
res.each(function() {
if (!$(this).find("#pytplir_div").length) {
this.appendChild($(btn_div).clone(true)[0]);
updateButtonState();
}
});
});
}
function updateButtonState() {
if (playPrevious) { // play previous video
$("polygon[id=pytplir_arrow_up]").each(function() {
this.setAttribute("style","fill:"+activeColor);
});
$("polygon[id=pytplir_arrow_down]").each(function() {
this.setAttribute("style","fill:"+inactiveColor);
});
} else { // play next video
$("polygon[id=pytplir_arrow_up]").each(function() {
this.setAttribute("style","fill:"+inactiveColor);
});
$("polygon[id=pytplir_arrow_down]").each(function() {
this.setAttribute("style","fill:"+activeColor);
});
}
}
function start() {
if ($("#pytplir_div").length) { return; }// button already loaded
withQuery(".html5-main-video", ":visible", function(res) {
player = res[0];
player.addEventListener("timeupdate",checkTime);
player.addEventListener("play", addButton); // ensure button is added
});
addButton();
}
function withQuery(query,filter="*", onSuccess = function(r){}) {
var res;
if (filter == "*") {
res = $(query);
} else {
res = $(query).filter(filter);
}
if (res.length) { // >= 1 result
onSuccess(res);
return res;
} else { // not loaded yet => retry
setTimeout(function(){withQuery(query);}, 100);
}
}
function checkTime() {
if (!$("#pytplir_div").length) {return;} // button not loaded
var timeLeft = player.duration - player.currentTime;
var videoPlayer = $(".html5-video-player")[0];
var miniplayerActive = ytdApp.hasAttribute("miniplayer-active_");
if (!shuffle || (miniplayerActive != miniplayerFlag)) { // wysiwyg
shuffle = $("path[d='M10.59 9.17L5.41 4 4 5.41l5.17 5.17 1.42-1.41zM14.5 4l2.04 2.04L4 18.59 5.41 20 17.96 7.46 20 9.5V4h-5.5zm.33 9.41l-1.41 1.41 3.13 3.13L14.5 20H20v-5.5l-2.04 2.04-3.13-3.13z']").filter(":visible").parents("button[aria-pressed]")[0];
}
var miniplayerFlag = miniplayerActive;
var shuffleEnabled = strToBool(shuffle.attributes["aria-pressed"].nodeValue);
try {videoPlayer.classList.contains("ad-showing");}
catch (TypeError) { // video player undefined
return;
}
var redirectTime;
if (miniplayerActive) {
redirectTime = redirectWhenTimeLeft_miniplayer;
} else {
redirectTime = redirectWhenTimeLeft;
}
if (timeLeft < redirectTime && !redirectFlag && playPrevious && !shuffleEnabled && !player.hasAttribute("loop") && !videoPlayer.classList.contains("ad-showing")) {
// attempt to prevent the default redirect from triggering
player.pause();
player.currentTime -= 2;
if (getVidNum() != "1") {
redirectFlag = true;
redirect();
setTimeout(function() {redirectFlag = false;}, 1000);
}
}
}
function getVidNum() {
var vidNum_tmp = $("#publisher-container").find("span")[1].innerHTML + "/"; // apparently this is e.g "1" in Firefox, but "1 / n" in Chrome
return $.trim(vidNum_tmp.substring(0,vidNum_tmp.indexOf("/")));
}
function redirect() {
var previousURL = getPreviousURL();
if (previousURL) {
previousURL.click();
}
}
function getPreviousURL(){ // returns <a> element
var elem;
if (ytdApp.hasAttribute("miniplayer-active_")) { // avoid being forced out of miniplayer mode on video load
elem = $("div.miniplayer").find("ytd-playlist-panel-video-renderer[selected]").prev();
} else {
elem = $("#content").find("ytd-playlist-panel-video-renderer[selected]").prev();
}
while (!elem.find("#unplayableText").prop("hidden")) { // while unplayable (e.g. private) video is selected
elem = elem.prev();
}
return elem.children()[0];
}
function strToBool(str) {
return str.toLowerCase() == "true";
}
// adapted from https://www.w3schools.com/js/js_cookies.asp
function setCookie(cname, cvalue) {
document.cookie = cname + "=" + cvalue + ";sameSite=lax;path=www.youtube.com/watch";
}
function getCookie(cname) {
var name = cname + "=";
var decodedCookie = decodeURIComponent(document.cookie);
var ca = decodedCookie.split(';');
for(var i = 0; i <ca.length; i++) {
var c = ca[i];
while (c.charAt(0) == ' ') {
c = c.substring(1);
}
if (c.indexOf(name) == 0) {
var x = c.substring(name.length, c.length);
return strToBool(x);
}
}
return "";
}
});
})();