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Wait for an element to exist. ES6, Promise, MutationObserver
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// MIT Licensed | |
// Author: jwilson8767 | |
/** | |
* Waits for an element satisfying selector to exist, then resolves promise with the element. | |
* Useful for resolving race conditions. | |
* | |
* @param selector | |
* @returns {Promise} | |
*/ | |
//export function elementReady(selector) { | |
function elementReady(selector) { | |
return new Promise((resolve, reject) => { | |
let el = document.querySelector(selector); | |
if (el) {resolve(el);} | |
new MutationObserver((mutationRecords, observer) => { | |
// Query for elements matching the specified selector | |
Array.from(document.querySelectorAll(selector)).forEach((element) => { | |
resolve(element); | |
//Once we have resolved we don't need the observer anymore. | |
observer.disconnect(); | |
}); | |
}) | |
.observe(document.documentElement, { | |
childList: true, | |
subtree: true | |
}); | |
}); | |
} |
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//import { elementReady } from "es6-element-ready"; | |
// Simple usage to delete an element if/when it exists: | |
elementReady('#someWidget').then((someWidget)=>{someWidget.remove();}); |
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