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October 12, 2022 11:34
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Wait for a DOM element to appear with a MutationObserver
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| const waitForElement = selector => new Promise((resolve, reject) => { | |
| const element = document.querySelector(selector); | |
| if (element) { | |
| return resolve(element); | |
| } | |
| const timeout = setTimeout(() => reject(new Error('element not found')), 15000); | |
| const walkDOM = (node, fn) => { | |
| if (node.matches && node.matches(selector)) { | |
| return fn(node); | |
| } | |
| node = node.firstChild; | |
| while (node) { | |
| walkDOM(node, fn); | |
| node = node.nextSibling; | |
| } | |
| }; | |
| try { | |
| const observer = new MutationObserver((mutations => { | |
| mutations.forEach(mutation => { | |
| const nodes = Array.from(mutation.addedNodes); | |
| return nodes.forEach(node => walkDOM(node, match => { | |
| observer.disconnect(); | |
| clearTimeout(timeout); | |
| return resolve(match); | |
| })); | |
| }); | |
| })); | |
| observer.observe(document.documentElement, { childList: true, subtree: true }); | |
| } catch (err) { | |
| return reject(err); | |
| } | |
| }); |
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The observer should also be disconnected on timeout, no ?