☰

Observe

observe and wait for elements

Fra og med 11.10.2025. Se den nyeste version.

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @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
    }
})();