Pengunaan ajax pada codeigniter

Coba seperti ini:

Di View (Bagian AJAX)

 <script>
    $(function(){
        $( "#btn" ).click(function(event)
        {
            event.preventDefault();
            var email= $("#email").val();

            $.ajax(
                {
                    type:"post",
                    url: "<?php echo base_url(); ?>index.php/blog_c/registre",
                    data:{ email:email},
                    success:function(response)
                    {
                        console.log(response);
                        $("#message").html(response);
                        $('#cartmessage').show();
                    }
                    error: function()
                    {
                        alert("Invalide!");
                    }
                }
            );
        });
    });
</script>

Di Controller

 public function registre()
{

    $email = $this->input->post('email'); # add this

    $this->form_validation->set_rules('email','EMAIL','trim|required|valid_email|is_unique[utilisateurs.email]');

    if($this->form_validation->run() == FALSE)
    {
        echo validation_errors();
    }
    else
    {
        if(!$this->blog_m->registre($email))
        {
            echo "Something Went Wrong";
        }
        else
        {
            echo "Inscription success";
        }

    }
}

Di Model

 function registre($email)
{
    $data = array(
                'email'=>$this->input->post('email')
            );

    $this->db->insert('utilisateurs',$data);
}

Source: https://stackoverflow.com/questions/42006000/codeigniter-jquery-ajax