Disallowed Key Characters

[eluser]www.sblog.in[/eluser]
You can do like below

You have a form with hidden input field which holds csrf token value

Code:

<form id="form" name="form" acti method="post">
<?php echo form_hidden($this->security->get_csrf_token_name(), $this->security->get_csrf_hash()); ?>
<input type="text" name="string" />
</form>

Then in ajax you can call

Code:

var cct = $("input[name=csrf_token_name]").val();
var token = $('#form').serialize();
var url = 'http://localhost/mysite/index.php/welcome/ajax_cart';
var data = 'ids='+string,
$.ajax({
                type: "POST",
                //async: false,
                url: url,
                data: data,
                dataType: "html",
                cache: false,
                csrf_token_name: cct,
                success: function(resp) {
                    alert(resp);
                }
            });