Waits for an element using the MutationObserver API
此脚本不应直接安装。它是供其他脚本使用的外部库，要使用该库请加入元指令 // @require https://update.greasyfork.org/scripts/528234/1701531/waitForElement.js
// ==UserScript==
// @name waitForElement
// @namespace Violentmonkey Scripts
// @version 3.0
// @description Waits for an element using the MutationObserver API
// @author maanimis
// @grant none
// ==/UserScript==
function waitForElement(selector, timeout = 5000) {
return new Promise((resolve) => {
const ELEMENT = document.querySelector(selector);
if (ELEMENT) {
return resolve(ELEMENT);
}
console.log("[not found] selector: %s\nwaiting...", selector);
const observer = new MutationObserver(() => {
const ELEMENT = document.querySelector(selector);
if (ELEMENT) {
console.log("element found!!");
resolve(ELEMENT);
observer.disconnect();
}
});
if (timeout && timeout >= 0) {
setTimeout(() => {
console.log("timeout reached, element not found: %s", selector);
resolve(null); // Resolve with null if timeout is reached
observer.disconnect(); // Disconnect the observer if the timeout occurs
}, timeout);
}
observer.observe(document.body, {
childList: true,
subtree: true,
});
});
}