how to send value of checkbox using jquery and ajax with codeigniter

guys how to make a checkbox, if i check it the value on checkbox will send to database without submit form function

this is my checkbox :

<input id="active_banner" type='checkbox' name='active_banner' value='1' title='Active Banner' <?=($data->promotion_active == 1)? "checked":""?> />

and this is my jquery :

<script>
$("#active_banner").click(function() {
    var id = "<?=$data->promotion_banner_id?>"
    var active = $("#active_banner").val();
    jQuery.ajax({
        type: "GET",
        url: "/ADMIN/ajax/active_banner/",
        data: {id:id,active:active},
    });

    });
</script>

i have tried to checked but, there is nothing happen in my ajax controller there is contain :

function active_banner(){
    $id = $this->input->get("id",true);
    $active = $this->input->get("active",true);

    $this->Control_panel_m->update_banner_active($id,$active);
    redirect('/ADMIN/'.country_code."/Edit_promotion_banner","refresh");

}

guys can you help me how to make it work?