Enhanced Faster Webpage Loading

Preload subsequent pages, lazy load images and videos, and use Pjax for faster webpage loading with robust error handling.
目前為 2025-01-02 提交的版本，檢視最新版本。
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// ==UserScript==
// @name         Enhanced Faster Webpage Loading
// @namespace    http://tampermonkey.net/
// @version      1.8
// @description  Preload subsequent pages, lazy load images and videos, and use Pjax for faster webpage loading with robust error handling.
// @author       Tae
// @match        *://*/*
// @grant        none
// ==/UserScript==

(function () {
    'use strict';

    // Lazy load images, videos, and multimedia
    document.addEventListener("DOMContentLoaded", function () {
        let lazyElements = Array.from(document.querySelectorAll("img.lazy, video.lazy, iframe.lazy"));

        function loadLazyElement(lazyElement) {
            const dataSrc = lazyElement.dataset.src;
            if (!dataSrc) return;

            lazyElement.src = dataSrc;
            if (lazyElement.tagName === "VIDEO") {
                lazyElement.load();
            }
            lazyElement.classList.remove("lazy");
        }

        if ("IntersectionObserver" in window) {
            const observer = new IntersectionObserver((entries, observer) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        loadLazyElement(entry.target);
                        observer.unobserve(entry.target);
                    }
                });
            });

            lazyElements.forEach(element => observer.observe(element));
        } else {
            // Fallback for browsers without IntersectionObserver
            const lazyLoadFallback = () => {
                lazyElements = lazyElements.filter(lazyElement => {
                    if (
                        lazyElement.getBoundingClientRect().top < window.innerHeight &&
                        lazyElement.getBoundingClientRect().bottom > 0 &&
                        getComputedStyle(lazyElement).display !== "none"
                    ) {
                        loadLazyElement(lazyElement);
                        return false; // Remove from list
                    }
                    return true; // Keep in list
                });
                if (lazyElements.length === 0) {
                    document.removeEventListener("scroll", lazyLoadFallback);
                    window.removeEventListener("resize", lazyLoadFallback);
                    window.removeEventListener("orientationchange", lazyLoadFallback);
                }
            };

            document.addEventListener("scroll", lazyLoadFallback);
            window.addEventListener("resize", lazyLoadFallback);
            window.addEventListener("orientationchange", lazyLoadFallback);
        }
    });

    // Prefetch subsequent pages
    document.addEventListener("mouseover", event => {
        const target = event.target;
        if (target.tagName === "A" && target.href) {
            const link = target.href;
            if (/relevant-part|pattern/.test(link)) { // Refine prefetch condition
                const prefetchLink = document.createElement("link");
                prefetchLink.rel = "prefetch";
                prefetchLink.href = link;
                document.head.appendChild(prefetchLink);
            }
        }
    });

    // Load and initialize Pjax
    if (typeof Pjax === "undefined") {
        const script = document.createElement("script");
        script.src = "https://cdnjs.cloudflare.com/ajax/libs/pjax/0.2.8/pjax.min.js";
        script.onload = initializePjax;
        document.head.appendChild(script);
    } else {
        initializePjax();
    }

    function initializePjax() {
        const pjax = new Pjax({
            elements: "a[href]", // Target links
            selectors: ["title", ".content"], // Update these elements
            cacheBust: true, // Cache busting for fresh content
        });

        // Pjax event listeners
        document.addEventListener("pjax:send", () => console.log("Pjax: Request sent."));
        document.addEventListener("pjax:complete", () => {
            console.log("Pjax: Request complete.");
            reinitializeLazyLoading(); // Reinitialize lazy loading for new content
        });
        document.addEventListener("pjax:error", event => {
            console.error("Pjax: Error occurred.", event);
            // Fallback to full reload
            window.location.href = event.request.responseURL || window.location.href;
        });
    }

    function reinitializeLazyLoading() {
        const newLazyElements = Array.from(document.querySelectorAll("img.lazy, video.lazy, iframe.lazy:not([src])"));
        newLazyElements.forEach(element => {
            if (!element.dataset.src) return; // Skip invalid elements
            const observer = new IntersectionObserver((entries, observer) => {
                entries.forEach(entry => {
                    if (entry.isIntersecting) {
                        element.src = element.dataset.src;
                        observer.unobserve(element);
                    }
                });
            });
            observer.observe(element);
        });
    }
})();
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