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waitForElement.js
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| function waitForElement(selector) { | |
| return new Promise(function(resolve, reject) { | |
| var element = document.querySelector(selector); | |
| if(element) { | |
| resolve(element); | |
| return; | |
| } | |
| var observer = new MutationObserver(function(mutations) { | |
| mutations.forEach(function(mutation) { | |
| var nodes = Array.from(mutation.addedNodes); | |
| for(var node of nodes) { | |
| if(node.matches && node.matches(selector)) { | |
| observer.disconnect(); | |
| resolve(node); | |
| return; | |
| } | |
| }; | |
| }); | |
| }); | |
| observer.observe(document.documentElement, { childList: true, subtree: true }); | |
| }); | |
| } |
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