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fagci/wait-for-head.js

Created July 11, 2022 14:23
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Function to wait for head. Used for userscripts (greasemonkey) with document-start.
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wait-for-head.js
function waitForHead(cb) {
const waiter = setInterval(function() {
if(document.head) {
clearInterval(waiter);
cb();
}
}, 0);
}
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fagci commented Jul 11, 2022

Explanation: createInterval executes function in another thread in same way as infinite loop. Then, after head exists, you can document.head.prepend() something by passing callback into waitForHead function.

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