1. <script>
   
2.       if (comment.value==""){
3.               $(".button").hide()
4.       } else {
5.               $(".button").show()
6.       };
   </script>
   
7. <textarea name="comment"></textarea>
   

So my problem is, I don't know how I am supposed to check if a textarea is empty.
I want to accomplish this "live" effect thing:

If textarea is empty, disable/hide .button
else show .button