file input webkitdirectory on android

[jimmywarting]

detecting directory support is flaky on mobile.

var input = document.createElement('input')
input.type = 'file'
alert('webkitdirectory' in input)

my chrome browser on android yields true - but selecting a folder isn't possible.
however it lets me pick files instead.

I would have been fine with a grateful degration or a progressive enhancement. But upon selecting files the input.files.length is still 0. So the change event won't even fire.

anyone have any suggestions?

[jimmywarting]

i figured maybe it wouldn't be possible to alter the filelist somehow if the webkitdirectory was added

function FileListItem(a) {
  a = [].slice.call(Array.isArray(a) ? a : arguments)
  for (var c, b = c = a.length, d = !0; b-- && d;) d = a[b] instanceof File
  if (!d) throw new TypeError("expected argument to FileList is File or array of File objects")
  for (b = (new ClipboardEvent("")).clipboardData || new DataTransfer; c--;) b.items.add(a[c])
  return b.files
}

var files = [
  new File(['content'], 'sample1.txt'),
  new File(['abc'], 'sample2.txt')
];
input.webkitdirectory = true
input.files = new FileListItem(files)
input.files.length === 2 // detection fail expected it to be 0 to match manual test result