Demonstrates how one can programmatically set a HTML file input's value.

set-html-file-input-programmatically

// Taken from SO: https://stackoverflow.com/questions/47119426/how-to-set-file-objects-and-length-property-at-filelist-object-where-the-files-a

const dT = new ClipboardEvent('').clipboardData || // Firefox < 62 workaround exploiting https://bugzilla.mozilla.org/show_bug.cgi?id=1422655
  new DataTransfer(); // specs compliant (as of March 2018 only Chrome)
dT.items.add(new File(['foo'], 'programmatically_created.txt'));
inp.files = dT.files;