JS Follow-up to #1963340

I have to admit I haven't looked for a documentation page on d.o that describes our JS standards when I wrote that patch. Thanks for the follow-up, good to know in the future :)

@nod_: I was wondering, what's our recommended way of using once() ?

$element = $(context).find('#selector).once('foo');
if ($element.length) {
  // do stuff on '$element'
}

or

$(context).find('#selector).once('foo').each(function () {
  // do stuff on 'this'
});

?

@nod_: makes sense, thks :-)

RTBC +1

Good catch, thanks!

Committed and pushed to 8.0.x.