Перенос строки jquery

$('#textarea').keypress(function(e) { 
if(window.event) { 
  var keyCode = window.event.keyCode;      
} 
else { 
  var keyCode = e.keyCode || e.which; 
} 
 
if( (!e.ctrlKey && (keyCode == 13)) ) { 
 
   e.preventDefault(); 
        $.ajax({ 
        url: "/", 
        context: document.body 
        }).done(function() { 
        $( "div" ).css("display", "block").text("Отправлено!"); 
        }); 
   }else if( (e.ctrlKey && (keyCode == 13)) || (keyCode == 10) ) { 
      caretStart = this.selectionStart; 
      caretEnd = this.selectionEnd; 
      this.value = (this.value.substring(0, caretStart) 
              + "\n" 
              + this.value.substring(caretEnd)); 
   }                   
});

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script> 
<div></div> 
<form action="/" id="form" method="post"> 
<textarea name="text" id="textarea" cols="30" rows="10"></textarea> 
</form>