Codeigniter ajax CSRF problem

You might like to try this code I’ve used. It works great:

<script type="text/javascript">
$(function(){
   $('.answerlist').each(function(e){

  $(this).click(function(){

    var valrad = $("input[@name=answer]:checked").val();


    var post_data = {
        'ansid': valrad,
        '<?php echo $this->security->get_csrf_token_name(); ?>' : '<?php echo $this->security->get_csrf_hash(); ?>'
    };

        $.ajax({
                type: "POST",
                url: "<?php echo base_url(); ?>online/checkanswer",
                data: post_data,
                success: function(msg){
                  /// do something 
                }
            });

  });

   });


});


</script>