Prevents HTML5 videos from auto-playing in new tabs on any page (not just YouTube) and pauses videos when leave tab. NOTE: On YouTube, click the main video area to play the video so don't have to click the Pause/Play button twice for the first time. From Dan Moorehead (xeonx1), developer of PowerAccess™ (http://PowerAccessDB.com) (https://twitter.com/PowerAccessDB).
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// ==UserScript==
// @name Disable HTML5 Video AutoPlay and Background Play (Pause On Leave Tab)
// @namespace xeonx1
// @version 1.6
// @description Prevents HTML5 videos from auto-playing in new tabs on any page (not just YouTube) and pauses videos when leave tab. NOTE: On YouTube, click the main video area to play the video so don't have to click the Pause/Play button twice for the first time. From Dan Moorehead (xeonx1), developer of PowerAccess™ (http://PowerAccessDB.com) (https://twitter.com/PowerAccessDB).
// @author Dan Moorehead (xeonx1), developer of PowerAccess™ (http://PowerAccessDB.com) (https://twitter.com/PowerAccessDB) and
// @match http://*/*
// @match https://*/*
// @grant none
// ==/UserScript==
(function () {
'use strict';
// ******** User Preferences ********
// Whether to pause videos when leaving a tab they are playing on
var pauseOnLeaveTab = true;
// Number of milliseconds after clicking where a video is allowed to autoplay.
var allowAutoPlayWithinMillisecondsOfClick = 500;
// For websites you won't to disable this script on, you can add domains (with or without subdomain, must not include http://, etc.) to always allow auto-play (doesn't affect pause on leave tab)
var autoPlaySitesWhitelist = [
// "youtube.com"
];
// For video hosting sources (eg. YouTube used for videos embedded on other sites), you can add domains (with or without subdomain, must not include http://, etc.) to always allow auto-play (doesn't affect pause on leave tab)
var autoPlaySourcesWhitelist = [
// "youtube.com"
];
//Advanced preferences from controlling side compatibility / testing:
var handlePlayingInAdditionToPlayEvent = false;
// ******** End Preferences ********
// *** Testing domains and code snippets: ***
// https://www.youtube.com/watch?v=OMOVFvcNfvE
// document.querySelector("video.html5-main-video").pause()
//TODO-MAYBE: We could add support for click anywhere on video to play/pause, but some video players may not update their play button status and therefore could be out-of-sync and many of them already support that (though not Apple Trailers, etc.)
var hasAutoPlaySourcesWhitelist = autoPlaySourcesWhitelist.length > 0;
var hasAutoPlaySitesWhitelist = autoPlaySitesWhitelist.length > 0;
var lastClickTimeMs = 0;
function isUrlMatch(url, pattern) {
var regex = "https?\:\/\/[a-zA-Z0-9\.\-]*?\.?" + pattern.replace(/\./, "\.") + "\/";
var reg = new RegExp(regex, "i");
return url.match(reg) !== null;
}
//returns true if auto-play is always allowed for the *website* video is shown on (not source its hosted on)
function isAutoPlayAllowedForSite(url) { // Check if video src is whitelisted.
if (hasAutoPlaySitesWhitelist) {
for (var i = 0; i < autoPlaySitesWhitelist.length; i++) {
if (isUrlMatch(url, autoPlaySitesWhitelist[i]))
return true;
}
}
return false;
}
//exit, if the page shown in tab is whitelisted (regardless of where video is hosted / embedded from)
if (isAutoPlayAllowedForSite(document.url)) {
return;
}
//determine name of event for switched away from tab, based on the browser
var tabHiddenPropertyName, tabVisibleChangedEventName;
if ("undefined" !== typeof document.hidden) {
tabHiddenPropertyName = "hidden";
tabVisibleChangedEventName = "visibilitychange";
} else if ("undefined" !== typeof document.webkitHidden) {
tabHiddenPropertyName = "webkitHidden";
tabVisibleChangedEventName = "webkitvisibilitychange";
} else if ("undefined" !== typeof document.msHidden) {
tabHiddenPropertyName = "msHidden";
tabVisibleChangedEventName = "msvisibilitychange";
}
function safeAddHandler(element, event, handler) {
element.removeEventListener(event, handler);
element.addEventListener(event, handler);
}
function getVideos() {
//OR: Can also add audio elements
return document.getElementsByTagName("video");
}
function isPlaying(vid) {
return !!(vid.currentTime > 0 && !vid.paused && !vid.ended && vid.readyState > 2);
}
function onTabVisibleChanged() {
//console.log("Tab visibility changed for Video auto-player disabling user script. Document is hidden status: ", document[tabHiddenPropertyName]);
var videos = getVideos();
//if doc is hidden (switched away from that tab), then pause all its videos
if (document[tabHiddenPropertyName]) {
//remember had done this
document.wasPausedOnChangeTab = true;
//pause all videos, since
for (var i = 0; i < videos.length; i++) {
var vid = videos[i];
pauseVideo(vid, true);
}
}
//document is now the active tab
else {
document.wasPausedOnChangeTab = false; //reset state (unless need to use this field or delay this)
//TODO-MAYBE: if want to auto-play once switch back to a tab if had paused before, then uncomment below, after changing from forEach() to for loop
// getVideos().forEach( function(vid) {
// if (vid.wasPausedOnChangeTab == true) {
// vid.wasPausedOnChangeTab = false;
// vid.play();
// }
// } );
}
}
//handle active tab change events for this document/tab
if (pauseOnLeaveTab) {
safeAddHandler(document, tabVisibleChangedEventName, onTabVisibleChanged);
}
//returns true if auto-play is always allowed for the *website* video is shown on (not source its hosted on)
//so YouTube videos embedded onto other sites will be blocked if YouTube is blocked here
function isAutoPlayAllowedForSource(url) { // Check if video src is whitelisted.
//NOTE: URL can start with blob: like on YouTube
if (hasAutoPlaySourcesWhitelist) {
for (var i = 0; i < autoPlaySitesWhitelist.length; i++) {
if (isUrlMatch(url, hasAutoPlaySourcesWhitelist[i]))
return true;
}
}
return false;
}
//on pause or ended/finished, change playing state back to not-playing, so know to start preventing playback again unless after a click
function onPaused(e)
{
e.target.isPlaying = false;
}
function pauseVideo(vid, isLeavingTab) {
var eventName = "auto-play";
if (isLeavingTab == true) //also handle undefind/unknown states
{
//OR: if wan't to avoid logging in some cases if not sure if playing:
//if {vid.isPlaying != false) console.log("Paused video playback because switched away from this tab for video with source: ", vid.currentSrc); else logIt = false;
vid.wasPausedOnChangeTab = true;
eventName = "on leaving tab";
//console.log("Paused video playback because switched away from this tab for video with source: ", vid.currentSrc);
}
console.log("Paused video " + eventName + " from source: ", vid.currentSrc);
//remember video is no longer playing - just in case, though event handler for pause should also set this
vid.isPlaying = false;
//always pause regardless of isPlaying or isVideoPlaying() since aren't always reliable
vid.pause();
}
function onPlay(e) { // React when a video begins playing
var msSinceLastClick = Date.now() - lastClickTimeMs;
var vid = e.target;
//exit, do nothing if is already playing (but not if undefined/unknown), in case clicked on seekbar, volume, etc. - don't toggle to paused state on each click
if(vid.isPlaying == true) {
//return;
}
vid.isPlaying = true;
//if haven't clicked recently on video, consider it auto-started, so prevent playback by pausing it (unless whitelisted source domain to always play from)
if (msSinceLastClick > allowAutoPlayWithinMillisecondsOfClick && !isAutoPlayAllowedForSource(vid.currentSrc)) {
pauseVideo(vid);
}
}
function addListenersToVideo(vid, srcChanged)
{
var pauseNow = false;
//if this is first time found this video
if (vid.hasAutoPlayHandlers != true) {
vid.hasAutoPlayHandlers = true;
safeAddHandler(vid, "play", onPlay);
//NOTE: Seems playing is needed in addition to play event, but isn't this just supposed to occur whenever play, plus after play once buffering is finished?
if (handlePlayingInAdditionToPlayEvent)
safeAddHandler(vid, "playing", onPlay);
safeAddHandler(vid, "pause", onPaused);
safeAddHandler(vid, "ended", onPaused);
pauseNow = true;
}
//if video source URL has NOT changed and had already hooked up and paused this video before, then exit, don't pause again (in case user had clicked to play it earlier but another video injected into the page caused inspecting all videos again)
//else if (srcChanged != true)
// return; //exit, don't pause it again
//pause the video since this is the first time was found OR src attribute had changed
if (pauseNow || srcChanged == true) {
pauseVideo(vid);
//vid.isPlaying = false; //allow upcoming first play event to cause pausing too this first time
}
}
function addListeners() {
var videos = getVideos();
//OR: Can get audio elements too
for (var i = 0; i < videos.length; i++) {
// Due to the way some sites dynamically add videos, the "playing" event is not always sufficient.
// Also, in order to handle dynamically added videos, this function may be called on the same elements.
// Must remove any existing instances of this event listener before adding. Prevent duplicate listeners.
var vid = videos[i];
addListenersToVideo(vid);
}
}
//handle click event so can limit auto play until X time after a click
safeAddHandler(document, "click", function () {
lastClickTimeMs = Date.now();
});
var observer = new MutationObserver(function(mutations) {
// Listen for elements being added. Add event listeners when video elements are added.
mutations.forEach(function(mutation) {
if (mutation.type == "attributes" && mutation.target.tagName == "VIDEO") { //&& mutation.attributeName == "src"
videoAdded = true;
addListenersToVideo(mutation.target, true);
}
if (mutation.addedNodes.length > 0) {
addListeners();
//faster to use getElementsByTagName() for rarely added types vs. iterating over all added elements, checking tagName
// for (var i = 0; i < mutation.addedNodes.length; i++) {
// var added = mutation.addedNodes[i];
// if (added.nodeType == 1 && added.tagName == "VIDEO") {
// videoAdded = true;
// }
// }
}
});
});
//subscribe to documents events for node added and src attribute changed via MutatorObserver, limiting to only src attribute changes
observer.observe(document, { attributes: true, childList: true, subtree: true, characterData: false, attributeFilter: ['src'] });
//don't also need to handle "spfdone" event
//hookup event handlers for all videos that exist now (will still add to any that are inserted later)
addListeners();
})();