getElementById from concatenated id in twig

Question

How do I get an element by id in javascript, kinda like this:

document.getElementById('assistance').style.display = 'none';

If the element id is defined in twig like this:

<div id="assistance-{{ key }}">

Answer 1

Assuming that

• You will only have one element with id starting with assistance and
• You don't know what id will be generated

You can use document.querySelector with attribute-starts-with match

document.querySelector('[id^="assistance--"]').style.display = 'none';