使用jquery响应codeigniter更新值

Question

<script type="text/javascript">
    function deactiveItemByID(ID, URL) {
        swal({
            title: "Are you sure?",
            text: "You will not be able to recover this item!",
            type: "warning",
            showCancelButton: true,
            confirmButtonText: "Yes, delete it",
            cancelButtonText: "No, cancel",
            allowOutsideClick: false,
            allowEscapeKey: false,
            allowEnterKey: false,
        }).then(function (isConfirm) {
            if (isConfirm) {
                $.post(URL,
                        {
                            ID: ID,
                        },
                        function (data, status) {
                            location.reload();
                        });
            }
        });
    }
</script>

<button onclick="deactiveItemByID('<?php  echo $employees->fldUserID; ?>', '<?php echo base_url($deactive_link); ?>');" type="button" class="btn btn-default btn-circle"></button>

model

function deactive_employee() {
    $fldUserID = $this->input->post('ID');
    $data = array(
        'fldUserActive' => '0' 
    );
    $this->db->where('fldUserID',$fldUserID);
    if($this->db->update('tblUser', $data)) {
        $this->session->set_flashdata('success_msg', 'Employee is deleted');
    }
}

controller

how to update the database using jquery respond... it is not displaying any error but also it is not inserting the value in the database Please help me solve my code

</div>