CKEditor Character Count

First of all, this question WAS answered here: CKeditor character/word count but all the answers give broken links... therefore it's not answered.

Using CKEditor, how to I get the character count on keyup, using jquery?

Here's what should work, but does not work:

<textarea id="newKnowledge_body"></textarea>
<script>
 $(function(){
      // this DOES work, fyi
      $("#new开发者_Python百科Knowledge_body").ckeditor();

      // this DOES NOT work
      $("#newKnowledge_body").keyup(function(){
          var len = $("#newKnowledge_body").val().length;
          alert(len);
      });
 });
</script>

I believe the problem lies in the "keyup" event. I don't get any response when referring to it like that... but I don't know what else to use.

Here is a quick solution with no plugins (not the best)

var len = $("#cke_contents_message").children("iframe").contents().find("body").text().length;

[UPDATE] THE BETTER WAY TO DO THAT

var editor = $('YOUR_TEXT_AREA').ckeditorGet();
editor.on("instanceReady", function(){                    
    this.document.on("keyup", function(){
        var editorContent = $(editor.getData());
        var plainEditorContent = editorContent.text().trim();
        console.log(plainEditorContent);
        console.log("Length: "+plainEditorContent.length);
    });
});

You need to register an event on the CKEditr like so:

editor.on( 'key', function( evt ){
   updateCount( evt.editor.getData() );       
}, editor.element.$ );

I also found this link that has a nice character count using jQuery and css. http://jsfiddle.net/VagrantRadio/2Jzpr/

Try using .change() instead of .keyup()