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waitForElement

Waits for an element using the MutationObserver API

Verzia zo dňa 04.03.2025. 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/528234/1546775/waitForElement.js 

// ==UserScript==
// @name         waitForElement
// @namespace    Violentmonkey Scripts
// @version      1.2
// @description  Waits for an element using the MutationObserver API
// @author       maanimis
// @grant        none
// ==/UserScript==
 
/**
 * Waits for a element of a given selector.
 *
 * @param {string} selector
 * @returns {Promise<HTMLElement>}
 */
 
 function waitForElement(selector) {
  return new Promise((resolve) => {
    const ELEMENT = document.querySelector(selector);
    if (ELEMENT) {
      return resolve(ELEMENT);
    }

    console.log("can't find element for selector:", selector, "waiting...");

    const observer = new MutationObserver(() => {
      const ELEMENT = document.querySelector(selector);
      if (ELEMENT) {
        console.log("element found!!");
        resolve(ELEMENT);
        observer.disconnect();
      }
    });

    observer.observe(document.body, {
      childList: true,
      subtree: true,
    });
  });
}