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Simple WaitForKeyElement

Library that Exports my simplified vanilla JS version of WaitForKeyElement, which is a simple async function that returns a Promise that resolves to an element by a given selector, when that element is found

目前为 2024-10-01 提交的版本。查看 最新版本。

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.cn-greasyfork.org/scripts/511024/1457630/Simple%20WaitForKeyElement.js 

  1. // ==UserScript==
  2. // @name        Simple WaitForKeyElement
  3. // @license     MIT
  4. // @namespace   1N07
  5. // @match       *://*/*
  6. // @version     1.0
  7. // @author      1N07
  8. // @description Library that Exports my simplified vanilla JS version of WaitForKeyElement, which is a simple async function that returns a Promise that resolves to an element by a given selector, when that element is found
  9. // ==/UserScript==
  10.  
  11. async function WaitForKeyElement(selector, timeout) {
  12. 	return new Promise((resolve, reject) => {
  13. 		let el = document.querySelector(selector);
  14.  
  15. 		if (el) {
  16. 			resolve(el);
  17. 			return;
  18. 		}
  19.  
  20. 		new MutationObserver((mutationRecords, observer) => {
  21. 			el = document.querySelector(selector);
  22. 			if (el) {
  23. 				resolve(el);
  24. 				observer.disconnect();
  25. 			}
  26. 		}).observe(document.documentElement, { childList: true, subtree: true });
  27.  
  28. 		if (timeout) {
  29. 			setTimeout(() => {
  30. 				reject(null);
  31. 			}, timeout);
  32. 		}
  33. 	});
  34. }