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js: listen to dom changes
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| export function onNode(root, selector, handler) { | |
| const target = root.querySelector(selector); | |
| if (target) return handler(target); | |
| new MutationObserver((records, observer) => { | |
| const target = records | |
| .filter(record => record.type === "childList") | |
| .flatMap(record => record.addedNodes) | |
| .find(node => node.nodeType === 1 && node.matches(selector)); | |
| if (target) { | |
| observer.disconnect(); | |
| handler(target); | |
| } | |
| }).observe(root, { | |
| attributes: false, | |
| characterData: false, | |
| childList: true, | |
| subtree: true | |
| }); | |
| } |
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