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waitForElement

Waits for an element using the MutationObserver API

Dette script bør ikke installeres direkte. Det er et bibliotek, som andre scripts kan inkludere med metadirektivet // @require https://updategreasyfork.deno.dev/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,
    });
  });
}