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Youtube Pause On Start

Pause Youtube video on start.

当前为 2024-02-15 提交的版本，查看 最新版本。

// ==UserScript==
// @name         Youtube Pause On Start
// @namespace    http://tampermonkey.net/
// @version      2024-02-15
// @description  Pause Youtube video on start.
// @author       Santeri Hetekivi
// @match        *://*.youtube.com/*
// @icon         https://www.google.com/s2/favicons?sz=64&domain=youtube.com
// @grant        none
// ==/UserScript==

(function () {
    'use strict';
    /**
     * Get element with selector and call callback with it.
     * @param {string} selector Selector for the element.
     * @param {function} callback Callback function to call with the element.
     */
    function forElement(selector, callback) {
        // Init forElement.timeoutCount.
        if (forElement.timeoutCount === undefined) {
            forElement.timeoutCount = {}
        }
        // Init forElement.timeoutCount[selector].
        if (forElement.timeoutCount[selector] === undefined) {
            forElement.timeoutCount[selector] = 0
        }

        // Get element.
        const element = document.querySelector(selector)

        // If element not found.
        if (element === null) {
            // try again after timeout.
            setTimeout(
                function () {
                    forElement(selector, callback)
                },
                (
                    // Base timeout.
                    100
                    *
                    // Increase timeout after each try.
                    (forElement.timeoutCount[selector]++)
                )
            )
        }
        // If element found
        else {
            // reset timeout count
            forElement.timeoutCount[selector] = 0
            // and call callback with element.
            callback(element)
        }
    }

    // Init previous video id.
    let videoIdPrevious = null;

    /**
     * Run on url change.
     */
    function onUrlChange() {
        // Get video id from url.
        const videoId = (new URLSearchParams(window.location.search)).get("v");
        // If
        if (
            // did not get video id
            videoId === null
            ||
            // or video id did not change
            videoId === videoIdPrevious
        ) {
            // just return.
            return
        }

        // Update previous video id.
        videoIdPrevious = videoId;

        // Run for
        forElement(
            // video element that has src attribute
            "video[src]",
            function (video) {
                // Init paused video ID.
                let pausedVideoId = null

                // Add event listener to video element
                video.addEventListener(
                    // for playing event
                    "playing",
                    function () {
                        // Get current video ID from URL.
                        const videoId = (new URLSearchParams(window.location.search)).get("v")

                        // If video id is different than last paused video
                        if (pausedVideoId !== videoId) {
                            // pause video
                            video.pause()
                            // and update paused video ID.
                            pausedVideoId = videoId
                        }
                    }
                )
            }
        )
    }

    // Add event listener for
    window.addEventListener(
        // Youtube page data updated event.
        'yt-page-data-updated',
        function () {
            onUrlChange();
        }
    );

    // Run on url change once on first load.
    onUrlChange();
})();