It is possible to set the 'disabled' attribute on a form control with attr(), but it is impossible to clear it.

E.g.:

Disables all inputs

$('input').attr('disabled', true);

Should reenable inputs, but doesn't.

$('input').attr('disabled', false);

Instead, I must use the much more clunky:

$('input').each(function() { this.disabled = false; });