CI框架下 ajax分页

用做于商品详情页的评论展示：

html:

<script>
var commodityid=<?php echo $info['commodity_id'] ?>;
var url="<?php echo base_url();?>index.php/frontend/ajax_getCommentList?comId="+commodityid+"&per_page=0";

ajax_page(url,commodityid);
//点击进行分页
 $('.page a').die().live('click',function() {
            var Href = $(this).attr("href");
            //清除上一次加载的html

        ajax_page(Href,commodityid);
            //loadtab(Href);
            return false;
});
 //ajax显示商品评论
 function ajax_page(url,id){
     $.ajax({
        type:"POST",
        url:url,
        dataType:"json",
        data:"comId="+id,
        success:function(msg){
            $(".info_comment").html('');
            for(var i=0;i<msg['commentList'].length;i++){

                $(".info_comment").append('<div class="info_comment_item">'+msg['commentList'][i]['username']+':'+msg['commentList'][i]['comment_content']+'</div>');
                if(msg['commentList'][i]['comment_reply_content']!=null){
                    $(".info_comment").append('<div class="info_comment_item">&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;回复：'+msg['commentList'][i]['comment_reply_content']+'</div>');
                }
            }
            $("#pageview").html(msg['page']);
        }
    })
}
</script>
<div class="info_comment"></div>

CI控制器：

    //ajax获取用户评论
    public function ajax_getCommentList(){
        $this->load->library('pagination');
        if($this->input->post('comId')){
            $comId=$this->input->post('comId');
        }else{
            $comId=$this->input->get('comId');
        }

        $num=2;
        $p=$this->input->get('per_page');
        if(empty($p)){
            $p=0;
        }
        $config['base_url'] =base_url().'index.php/frontend/ajax_getCommentList?comId='.$comId;
        $config['total_rows'] =$this->frontend_model->comments_like_total($comId);
        $config['query_string_segmnt']='per_page';
        $config['page_query_string']=true;
        $config['full_tag_open']="<div class='page'>";
        $config['per_page']=$num;
        $config['full_tag_close'] = "</div>";

        $this->pagination->initialize($config);
        $pageview=$this->pagination->create_links();

        $p=$this->input->get('per_page');
        if(empty($p)){
            $p=0;
        }
        $commentList=array();
        $commentList['page']=$pageview;
        $commentList['commentList']=$this->frontend_model->get_comment_list($comId,$p,$num);
        echo json_encode($commentList);
    }