I have tested this item successfully on 569e7ee

This PR has received new commits.

CC: @brianteeman

I have tested this item unsuccessfully on d53a5c9

Besides the Tste: i tested this by adding to one of the joomla xmls.

<field
    name="testfile"
    type="file"
    label="custom label"
    description="custom description"
    size="40"
    accept="image/*"
    class="test-class1 test-class2"
    disabled="true"
    multiple="true"
    autofocus="true"
    required="true"
    onchange="alert('a');"
/>

Result:

<input type="file"
    name="jform[testfile][]"
    id="jform_testfile"
     required aria-required="true" />

This PR has received new commits.

CC: @andrepereiradasilva, @brianteeman

Oops, my bad! Now everything should be fine:

@dgt41 thanks it works. for me is tested with success.
I would do it with clean HTML output (without tabs and line ends), but is working fine.

Before patch:

<input type="file" name="jform[testfile][]" id="jform_testfile" accept="image/*" disabled class="test-class required" size="40" onchange="alert('a');" required aria-required="true" autofocus multiple />

After patch

<input type="file"
    name="jform[testfile][]"
    id="jform_testfile"
     size="40"   accept="image/*"    class="test-class required"     multiple    disabled    autofocus   onchange="alert('a');"  required aria-required="true" />

I have tested this item successfully on 4784cee

Looks good to me. I like it.

I have tested this item successfully on 4784cee

Way to go!

But... in the JLayout, why not just:

echo '<input type="file" name="' . $name . '" id="' . $id . '"';
echo !empty($size) ? ' size="' . $size . '"' : '';
echo !empty($accept) ? ' accept="' . $accept . '"' : '';
echo !empty($class) ? ' class="' . $class . '"' : '';
echo !empty($multiple) ? ' multiple' : '';
echo $disabled ? ' disabled' : '';
echo $autofocus ? ' autofocus' : '';
echo !empty($onchange) ? ' onchange="' . $onchange . '"' : '';
echo $required ? ' required aria-required="true"' : '';
echo '/>';

that is without all the opened-and-closed <?php ... ?>?
Using echo for the first part will also generate a tidier HTML without extra newlines and tabs...

Edit: or even a single multi-line echo with strings concatenation or commas (see: http://www.electrictoolbox.com/php-echo-commas-vs-concatenation/ if interested in very marginal optimization...)

@smz JLayouts are supposed to be HTML files so that front end devs can consume easier. I also try to concatenate those vars but I messed up the whole thing

Setting RTC and a milestone of 3.6

I assume you will now be working on the other fieldtypes

@brianteeman I will make PR's for all of them this week, but I need some time for calendar and other fields with JS in order to make sure that will be compatible with the new repeatable field. (I've got the code but haven't tested it against @fedik 's PR)

Great