Input file test

by ktsn

HTML

<div>
  File Size: <output id="size"></output>
</div>

<input id="file" type="file">

JavaScript

const input = document.getElementById('file')

input.addEventListener('change', event => {
  const file = event.target.files[0]
  const el = document.getElementById('size')
  el.textContent = (file.size / 1024 / 1024) + ' MB'
})