$(document).ready(function(){
    $('#textarea').keypress(function(e){
        if(e.shiftKey === true){
            if(e.which == 13){
                $('#textarea').append("\n");
            }

        }else if(e.shiftKey === false){
            if(e.which == 13){
                  // submit to form using submit()
                  $('span#display').text($('#textarea').val());
            }
        }
    });
});