Provides autoplay options via url parameters on song or playlist URLs
// ==UserScript==
// @name Google Play Music Autoplay
// @namespace https://play.google.com/music
// @version 0.1
// @description Provides autoplay options via url parameters on song or playlist URLs
// @author https://gist.github.com/baisong/fdf8df8ebd7e4852a2b8d5cacb373418
// @require http://code.jquery.com/jquery-1.11.3.min.js
// @include http://play.google.com/music/listen*
// @include https://play.google.com/music/listen*
// @include http://music.google.com/music/listen*
// @include https://music.google.com/music/listen*
// @match http://play.google.com/music/listen*
// @match https://play.google.com/music/listen*
// @match http://music.google.com/music/listen*
// @match https://music.google.com/music/listen*
// @run-at document-end
// @grant none
// ==/UserScript==
/**
* Usage:
* On a single song URL (generate by selecting "Share" on a song), add ?autoplay=true
*
* On a playlist URL, add ?autoplay=true&index={X}, where {X} is the offset of the
* song you wish to play on the playlist.
*/
console.log('Running Google Play Music Autoplay');
console.log('View source:');
console.log('https://gist.github.com/baisong/fdf8df8ebd7e4852a2b8d5cacb373418');
/**
* Fetch a URL parameter by name if it exists, otherwise return null.
*/
function getParameterByName(name, url) {
if (!url) url = window.location.href;
name = name.replace(/[\[\]]/g, "\\$&");
var regex = new RegExp("[?&]" + name + "(=([^&#]*)|&|#|$)"),
results = regex.exec(url);
if (!results) return null;
if (!results[2]) return '';
return decodeURIComponent(results[2].replace(/\+/g, " "));
}
/**
* Scroll and wait, then scroll again recursively until item is reached.
*
* Emulates a while loop with successive conditional setTimeout() calls
*/
function scroll($, index) {
var selector = ".song-row[data-index='" + index + "'] button";
var enough = false;
console.log('Checking for selector "' + selector + '"...');
var foundItem = $(selector).length;
console.log(foundItem);
if (foundItem) {
enough = true;
console.log('[*] Clicking item in playlist.');
$(selector).click();
}
var nextScroll = ($('#mainContainer').scrollTop() + $('#mainPanel').height());
var remainingScroll = $('#mainContainer').prop('scrollHeight');
console.log('Checking for room to scroll... Is (' + nextScroll + ' < ' + remainingScroll + ')');
var stillRoomToScroll = nextScroll < remainingScroll;
console.log(stillRoomToScroll);
if (!enough && stillRoomToScroll) {
console.log('Scrolling...');
$('#mainContainer').scrollTop(nextScroll);
setTimeout(function() {
scroll($, index);
}, 500);
}
console.log('Scroll complete');
}
/**
* Helper function to only execute a callback after an element exists.
*/
function initAfter(selector, callback) {
var enough = false;
if (($(selector) !== null) && $(selector).length) {
console.log('Initializing.');
enough = true;
callback(selector);
}
if (!enough) {
setTimeout(function() {
console.log('Waiting...');
initAfter(selector, callback);
}, 500);
}
}
/**
* Only clicks on the selected song after it exists on the page.
*/
function clickAfter(selector) {
console.log('Found selected row');
$(selector).click();
}
/**
* Only checks for URL parameters after song table exists on the page.
*/
function googleAutoPlay() {
if (getParameterByName('autoplay') == 'true') {
console.log('Found autoplay param');
initAfter('.selected-song-row button', clickAfter);
if ((getParameterByName('index') !== null) && getParameterByName('index').length) {
console.log('Found index param');
var index = parseInt(getParameterByName('index')) - 1;
scroll($, index);
}
}
}
$(document).ready(function() {
console.log('Document ready');
initAfter('.song-table', googleAutoPlay);
});