waitForElement

Waits for an element using the MutationObserver API

此脚本不应直接安装，它是一个供其他脚本使用的外部库。如果您需要使用该库，请在脚本元属性加入：// @require https://update.gf.qytechs.cn/scripts/528234/1546775/waitForElement.js

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Wrap lines

// ==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,
    });
  });
}

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