JQuery :: Empty Doesn't Check Values After Loading

I'm trying to select my textarea only if it is not empty. I have used :empty for this purpose. This works find when you load the page, however if you start typing in it still considers the value as it was when the page loads.

Example. If my textarea is empty when I load the page, it will consider it empty. If I starting typing in, and check if it is empty it still say it is empty.

The same vice versa. If my textarea has text when the page loads, then i clear that data, it still consider it filled not empty.

So how to make the check of :empty in real time?