<script>
        $(function() {
            function str_rand() {
                var result       = '';
                var words        = '0123456789qwertyuiopasdfghjklzxcvbnmQWERTYUIOPASDFGHJKLZXCVBNM';
                var max_position = words.length - 1;
                for( i = 0; i < 12; ++i ) {
                    position = Math.floor ( Math.random() * max_position );
                    result = result + words.substring(position, position + 1);
                }
                return result;
            }


                 $("#generation").click(function() {
                $("#password, #password_confirmation ").val(str_rand());

            });
        });
    </script>