Counting number of characters typed on textarea using jQuery

There is textarea for input with id mytext

<textarea id="mytext" ></textarea>

A  div with id char_counter for counting number of characters typed in textarea

<div id="char_counter"></div>

jQuery code: using keyup to update the characters typed.

$(document).ready(function(){

 

    $('#mytext').keyup( function(){

   var text_length = $('#mytext').val().length;

    $('#char_counter').html(text_length + ' characters  are typed');

  });

}); 

if space is not counted, we should use 
var text_length = $.trim($('#mytext').val()).length;