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Observe

observe and wait for elements

Verzia zo dňa 11.10.2025. Pozri najnovšiu verziu.

Tento skript by nemal byť nainštalovaný priamo. Je to knižnica pre ďalšie skripty, ktorú by mali používať cez meta príkaz // @require https://update.greasyfork.org/scripts/552301/1675881/Observe.js 

// ==UserScript==
// @name         Observe
// @license      MIT
// @version      1.1
// @description  observe and wait for elements
// @author       tukars
// @match        *://*/*
// ==/UserScript==

(function() {
    if (window.Observe) {
        return;
    }
    
    const timeStamp = function() {
        const now = new Date();
        const pad = (num, size) => String(num).padStart(size, "0");
        
        const hours = pad(now.getHours(), 2);
        const minutes = pad(now.getMinutes(), 2);
        const seconds = pad(now.getSeconds(), 2);
        const milliseconds = pad(now.getMilliseconds(), 3);
        
        return `${hours}:${minutes}:${seconds}.${milliseconds}`;
    }
    
    const contextPrint = function(message, ENABLE_DEBUG_LOGGING) {
        const messageTime = () => `[${message}] ${timeStamp()} -`;
        
        const log = function (...args) {console.log(messageTime(), ...args);};
        const warn = function (...args) {console.warn(messageTime(), ...args);};
        const error = function (...args) {console.error(messageTime(), ...args);};
        const info = function (...args) {console.info(messageTime(), ...args);};
        var debug = function (...args) {console.debug(messageTime(), ...args);};
        if (!ENABLE_DEBUG_LOGGING) {debug = function () {};}
        
        return { log, warn, error, info, debug };
    }
    
    const observeChildren = function(element, config, callback) {
        const observer = new MutationObserver((mutationsList) => {
            for (const mutation of mutationsList) {
                if (mutation.type === "childList") {
                    callback(Array.from(mutation.addedNodes));
                }
            }
        });
        var use_config;
        if (!config) {use_config = {childList: true, subtree: false };} 
        else {use_config = config;}
        observer.observe(element, use_config);
        return observer;
    }
    
    const observeChildrenWithFilter = function(element, config, filter, callback) {
        return observeChildren(element, config, (addedNodes) =>
            callback(addedNodes.filter(filter))
        );
    }
    
    const observeChildrenWithTags = function(element, config, filterTags, callback) {
        return observeChildrenWithFilter(
            element,
            config,
            (node) =>
                node.nodeType === Node.ELEMENT_NODE &&
                filterTags.includes(node.tagName.toLowerCase()),
            callback
        );
    }
    
    const observeAndHandle = function(element, tags, fun, config) {
        var use_config;
        if (!config) {use_config = {childList: true, subtree: true };} 
        else {use_config = config;}
        observeChildrenWithTags(element, use_config, tags, (nodes) =>
            nodes.forEach((node) => fun(node))
        );
    }
    
    function waitForElement(selector, callback) {
        const element = document.querySelector(selector);
        if (element) {
            callback(element);
        } else {
            const observer = new MutationObserver((_, obs) => {
                const el = document.querySelector(selector);
                if (el) {
                    obs.disconnect();
                    callback(el);
                }
            });
            observer.observe(document.body, {childList: true, subtree: true,});
        }
    }
    
    window.Observe = {
        timeStamp,
        contextPrint,
        observeChildren,
        observeChildrenWithFilter,
        observeChildrenWithTags,
        observeAndHandle,
        waitForElement
    }
})();