Control YouTube video volume by mouse wheel.
Versione datata
// ==UserScript==
// @name YouTube Volume Mouse Controller
// @namespace wddd
// @version 1.3.0
// @author wddd
// @license MIT
// @description Control YouTube video volume by mouse wheel.
// @homepage https://github.com/wdwind/YouTubeVolumeMouseController
// @match *://www.youtube.com/*
// @require https://ajax.aspnetcdn.com/ajax/jQuery/jquery-3.3.1.min.js
// ==/UserScript==
function run() {
var player = $("video");
var timer = 0;
// detect available wheel event
var support = "onwheel" in document.createElement("div") ? "wheel" : // Modern browsers support "wheel"
document.onmousewheel !== undefined ? "mousewheel" : // Webkit and IE support at least "mousewheel"
"DOMMouseScroll"; // let"s assume that remaining browsers are older Firefox
player.off(support).on(support, function (event) {
var originalEvent = event.originalEvent;
var volume = player[0].volume;
var volumeDelta = 0.05;
var deltaY = 0;
if (support == "mousewheel") {
deltaY = originalEvent.wheelDelta;
} else {
deltaY = originalEvent.deltaY || originalEvent.detail;
}
volume += (deltaY > 0 ? -volumeDelta : volumeDelta);
if (player[0].muted) {
// Unmute first
$(".ytp-mute-button").click();
}
player[0].volume = Math.max(0, Math.min(1, volume));
$(".ytp-volume-panel").attr("aria-valuenow", (player[0].volume * 100).toFixed(0));
$(".ytp-volume-slider-handle").css({
left: ((player[0].volume * 100) * 0.4) + "px"
});
timer = showSlider(timer);
// Prevent the page to scroll
return false;
});
}
function showSlider(timer) {
if (timer) {
clearTimeout(timer);
}
var sliderBar = appendSlideBar();
sliderBar.fadeIn(100);
timer = setTimeout(function () {
sliderBar.fadeOut(700);
}, 1000);
sliderBar.html("Volume: " + ($("video")[0].volume * 100).toFixed(0));
return timer;
}
function appendSlideBar() {
var sliderBar = $("div#sliderBar");
if (!sliderBar[0]) {
$(".html5-video-container").append("<div id=\"sliderBar\"></div>");
sliderBar = $("div#sliderBar");
sliderBar.css({
"width": "100%",
"height": "20px",
"position": "relative",
"z-index": "9999",
"text-align": "center",
"color": "#fff",
"font-size": "initial",
"opacity": "0.9",
"background-color": "rgba(0,0,0,0.2)",
});
}
sliderBar.css({
"top": getSliderBarTopProp()
});
return sliderBar;
}
function getSliderBarTopProp() {
var fullScreenTitle = $(".ytp-title");
if (fullScreenTitle[0] && fullScreenTitle.is(":visible")) {
return fullScreenTitle.height();
}
var videoTop = $("video")[0].getBoundingClientRect().top;
var headerBoundingBox = $("#masthead-positioner, #masthead-container")[0].getBoundingClientRect();
var headerTop = headerBoundingBox.top;
var headerHeight = headerBoundingBox.height;
var overlap = (headerHeight + headerTop > 0) ? Math.max(0, headerHeight - videoTop) : 0;
return overlap;
}
/**
* YouTube use Javascript to navigate between pages. So the script will not work:
* 1. If the script only includes/matches the sub pages (like the video page www.youtube.com/watch?v=...)
* 2. And the user navigates to the sub page from a page which is not included/matched by the script
*
* In the above scenario, the script will not be executed.
*
* To run the script in all cases,
* 1. Include/match the whole YouTube host
* 2. Detect Javascript events, and run the script appropriately
*
* Details:
* * https://stackoverflow.com/questions/32275387/recall-tampermonkey-script-when-page-location-changes/32277150#32277150
* * https://stackoverflow.com/questions/34077641/how-to-detect-page-navigation-on-youtube-and-modify-html-before-page-is-rendered
* * https://github.com/1c7/Youtube-Auto-Subtitle-Download/blob/master/Youtube-Subtitle-Downloader/Tampermonkey.js#L122-L152
*/
// trigger when navigating to new material design page
window.addEventListener("yt-navigate-finish", function () {
if (window.location.href.includes("/watch?v=")) {
run();
}
});
// trigger when navigating to the old page
window.addEventListener("spfdone", function () {
if (window.location.href.includes("/watch?v=")) {
run();
}
});
// trigger when directly loading the page
window.addEventListener("DOMContentLoaded", function () {
if (window.location.href.includes("/watch?v=")) {
run();
}
});
/**
* Use MutationObserver to cover all edge cases.
* https://stackoverflow.com/a/39803618
*
* This is to handle the use case where navigation happens but <video> has not been loaded yet.
* (In YouTube the contents are loaded asynchronously.)
*/
var observer = new MutationObserver(function(mutations) {
if ($("video")[0]) {
run();
observer.disconnect();
return;
}
mutations.forEach(function(mutation) {
mutation.addedNodes.forEach(function(node) {
if (node.tagName && node.tagName.toLowerCase() === "video") {
run();
observer.disconnect();
return;
}
});
});
});
observer.observe(document.body, /* config */ {childList: true, subtree: true});