How to Submit textarea comment on Enter key?

[eluser]Volkof[/eluser]
Hi guys,

I want a textarea where user type some comments and hit Enter, the comment is submitted without pressing Submit button.

I searched through the web and found something like the code below, but it does not seems to work. Can anyone point out my mistake?

Code:

$("commentForm").keypress(function(event) {
    if (event.which == 13) {
  alert("Submit!");
        event.preventDefault();
        $("commentForm").submit();
    }
});

This is my View (I left the submit button there, but if the OnEnter works, I will remove the button):

Code:

//Create a textarea for Comments
     $commentForm = array('id' => 'commentForm');
     echo form_open('comment/addComment/', $commentForm);
    
     $comment = array(
        'name'        => 'comment',
        'rows'  => '4',
        'cols'        => '30',
        'id'   => 'commentbox',
        'onkeypress' => 'submitComment()',
      );
     echo "<p>Your comment for this review:<br/>";
     echo form_textarea($comment);
     echo "</p>";

     echo "<p>";
     echo form_submit('submit', 'Post Comment');
     echo "</p>";
    
     echo form_hidden('reviewID', $row->reviewID);
     echo form_close();