thinkPHP实现基于ajax的评论回复功能

<?php
namespace Home\Controller;
use Think\Controller;
class IndexController extends Controller {
  public function index(){
    $num = M('comment')->count(); //获取评论总数
    $this->assign('num',$num);
    $data=array();
    $data=$this->getCommlist();//获取评论列表
    $this->assign("commlist",$data);
    $this->display('index');
  }
  /**
  *添加评论
  */
  public function addComment(){
    $data=array();
    if((isset($_POST["comment"]))&&(!empty($_POST["comment"]))){
      $cm = json_decode($_POST["comment"],true);//通过第二个参数true，将json字符串转化为键值对数组
      $cm['create_time']=date('Y-m-d H:i:s',time());
      $newcm = M('comment');
      $id = $newcm->add($cm);
      $cm["id"] = $id;
      $data = $cm;
      $num = M('comment')->count();//统计评论总数
      $data['num']= $num;
    }else{
      $data["error"] = "0";
    }
    echo json_encode($data);
  }
  /**
  *递归获取评论列表
  */
  protected function getCommlist($parent_id = 0,&$result = array()){
    $arr = M('comment')->where("parent_id = '".$parent_id."'")->order("create_time desc")->select();
    if(empty($arr)){
      return array();
    }
    foreach ($arr as $cm) {
      $thisArr=&$result[];
      $cm["children"] = $this->getCommlist($cm["id"],$thisArr);
      $thisArr = $cm;
    }
    return $result;
  }
}

$(function(){
  //点击提交评论内容
  $('body').delegate('.comment-submit','click',function(){
    var content = $.trim($(this).parent().prev().children("textarea").val());//根据布局结构获取当前评论内容
    $(this).parent().prev().children("textarea").val("");//获取完内容后清空输入框
    if(""==content){
      alert("评论内容不能为空!");
    }else{
      var cmdata = new Object();
      cmdata.parent_id = $(this).attr("parent_id");//上级评论id
      cmdata.content = content;
      cmdata.nickname = "游客";//测试用数据
      cmdata.head_pic = "/Public/images/default.jpg";//测试用数据
      var replyswitch = $(this).attr("replyswitch");//获取回复开关锁属性
      $.ajax({
        type:"POST",
        url:"/index.php/home/index/addComment",
        data:{
          comment:JSON.stringify(cmdata)
        },
        dataType:"json",
        success:function(data){
          if(typeof(data.error)=="undefined"){
            $(".comment-reply").next().remove();//删除已存在的所有回复div
            //更新评论总数
            $(".comment-num").children("span").html(data.num+"条评论");
            //显示新增评论
            var newli = "";
            if(cmdata.parent_id == "0"){
             //发表的是一级评论时，添加到一级ul列表中
             newli = "<li comment_id='"+data.id+"'><div ><div><img class='head-pic' src='"+data.head_pic+"'              $(".comment-ul").prepend(newli);
            }else{
             //否则添加到对应的孩子ul列表中
              if('off'==replyswitch){//检验出回复关闭锁存在，即三级评论不再提供回复功能
                newli = "<li comment_id='"+data.id+"'><div ><div><img class='head-pic' src='"+data.head_pic+"'              }else{//二级评论的回复按钮要添加回复关闭锁属性
                newli = "<li comment_id='"+data.id+"'><div ><div><img class='head-pic' src='"+data.head_pic+"'              }
              $("li[comment_id='"+data.parent_id+"']").children("ul").prepend(newli);
            }
          }else{
            //有错误信息
            alert(data.error);
          }
        }
      });
    }
  });
  //点击"回复"按钮显示或隐藏回复输入框
  $("body").delegate(".comment-reply","click",function(){
    if($(this).next().length>0){//判断出回复div已经存在,去除掉
      $(this).next().remove();
     }else{//添加回复div
      $(".comment-reply").next().remove();//删除已存在的所有回复div
      //添加当前回复div
      var parent_id = $(this).attr("comment_id");//要回复的评论id
      var divhtml = "";
      if('off'==$(this).attr("replyswitch")){//二级评论回复后三级评论不再提供回复功能,将关闭属性附加到"提交回复"按钮"
        divhtml = "<div class='div-reply-txt' style='width:98%;padding:3px;' replyid='2'><div><textarea class='txt-reply' replyid='2' style='width: 100%; height: 60px;'></textarea></div><div style='margin-top:5px;text-align:right;'><a class='comment-submit' parent_id='"+parent_id+"' style='font-size:14px;text-decoration:none;background-color:#63B8FF;' href='javascript:void(0);' replyswitch='off' >提交回复</a></div></div>";
      }else{
        divhtml = "<div class='div-reply-txt' style='width:98%;padding:3px;' replyid='2'><div><textarea class='txt-reply' replyid='2' style='width: 100%; height: 60px;'></textarea></div><div style='margin-top:5px;text-align:right;'><a class='comment-submit' parent_id='"+parent_id+"' style='font-size:14px;text-decoration:none;background-color:#63B8FF;' href='javascript:void(0);'>提交回复</a></div></div>";
      }
      $(this).after(divhtml);
     }
  });
})

.comment-filed{
  width:640px;
  margin:0 auto;
}
.comment-num{
  text-align: right;
  font-size:14px;
}
.div-txt-submit{
  text-align:right;
  margin-top:8px;
}
.comment-submit{
  background-color:#63B8FF;
  margin-top:15px;
  text-decoration:none;
  color:#fff;
  padding:5px;
  font-size:14px;
}
.txt-commit{
  border:1px solid blue;
  width:620px;
  height: 60px;
  padding: 10px;
}
.txt-reply{
  width: 100%;
  height: 60px;
}
.comment-filed-list{
  margin-top:20px;
}
.comment-list{
  margin-top:2px;
  width:herit;
  height:50px;
  border-top:1px solid gray;
}
.comment-ul{
  list-style:none;
  padding-left:0;
}
.head-pic{
  width:40px;
  height:40px;
}
.cm{
  position:relative;
  top:0px;
  left:40px;
  top:-40px;
  width:600px;
}
.cm-header{
  padding-left:5px;
}
.cm-content{
  padding-left:5px;
}
.cm-footer{
  padding-bottom:15px;
  text-align:right;
  border-bottom: 1px dotted #CCC;
}
.comment-reply{
  text-decoration:none;
  color:gray;
  font-size: 14px;
}
.children{
  list-style:none;
  background-color:#FAFAFA;
  padding-left:0;
  margin-left:40px;
}
.children-cm{
  position:relative;
  left:40px;
  top:-40px;
  width:90%;
}

<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.01 Transitional//EN" "http://www.w3.org/TR/html4/loose.dtd">
<html lang="en">
<head>
  <meta http-equiv="Content-Type" content="text/html;charset=UTF-8">
  <title>php评论及回复功能</title>
  <link rel="stylesheet" type="text/css" href="/Public/css/comment.css" rel="external nofollow" >
  <script type="text/javascript" src="/Public/js/jquery-1.11.3.min.js" ></script>
  <script type="text/javascript" src="/Public/js/comment.js" ></script>
</head>
<body>
<div class="comment-filed">
 <!--发表评论区begin-->
 <div>
  <div class="comment-num">
    <span>{$num}条评论</span>
  </div>
  <div>
    <div>
    <textarea class="txt-commit" replyid="0"></textarea>
    </div>
    <div class="div-txt-submit">
      <a class="comment-submit" parent_id="0" style="" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" ><span style=''>发表评论</span></a>
    </div>
  </div>
 </div>
 <!--发表评论区end-->
 <!--评论列表显示区begin-->
  <!-- {$commentlist} -->
  <div class="comment-filed-list" >
    <div><span>全部评论</span></div>
    <div class="comment-list" >
      <!--一级评论列表begin-->
      <ul class="comment-ul">
        <volist name="commlist" id="data">
          <li comment_id="{$data.id}">
          <div >
            <div>
              <img class="head-pic" src="{$data.head_pic}"            </div>
            <div class="cm">
              <div class="cm-header">
              <span>{$data.nickname}</span>
              <span>{$data.create_time}</span>
              </div>
              <div class="cm-content">
                <p>
                  {$data.content}
                </p>
              </div>
              <div class="cm-footer">
                <a class="comment-reply" comment_id="{$data.id}" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >回复</a>
              </div>
            </div>
          </div>
          <!--二级评论begin-->
          <ul class="children">
            <volist name="data.children" id="child" >
            <li comment_id="{$child.id}">
              <div >
                <div>
                  <img class="head-pic" src="{$child.head_pic}"                </div>
                <div class="children-cm">
                  <div class="cm-header">
                  <span>{$child.nickname}</span>
                  <span>{$child.create_time}</span>
                  </div>
                  <div class="cm-content">
                    <p>
                      {$child.content}
                    </p>
                  </div>
                  <div class="cm-footer">
                    <a class="comment-reply" replyswitch="off" comment_id="{$child.id}" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >回复</a>
                  </div>
                </div>
              </div>
              <!--三级评论begin-->
              <ul class="children">
                <volist name="child.children" id="grandson" >
                <li comment_id="{$grandson.id}">
                  <div >
                    <div>
                      <img class="head-pic" src="{$grandson.head_pic}"                    </div>
                    <div class="children-cm">
                      <div class="cm-header">
                      <span>{$grandson.nickname}</span>
                      <span>{$grandson.create_time}</span>
                      </div>
                      <div class="cm-content">
                        <p>
                          {$grandson.content}
                        </p>
                      </div>
                      <div class="cm-footer">
                        <!-- <a class="comment-reply" comment_id="1" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >回复</a> -->
                      </div>
                    </div>
                  </div>
                </li>
                </volist>
              </ul>
              <!--三级评论end-->
            </li>
            </volist>
          </ul>
          <!--二级评论end-->
        </li>
        </volist>
      </ul>
      <!--一级评论列表end-->
    </div>
  </div>
 <!--评论列表显示区end-->
</div>
</body>
</html>

DROP TABLE IF EXISTS `t_comment`;
CREATE TABLE `t_comment` (
 `id` int(11) NOT NULL AUTO_INCREMENT COMMENT '主键id',
 `parent_id` int(11) NOT NULL COMMENT '上级评论id,若是一级评论则为0',
 `nickname` varchar(100) DEFAULT NULL COMMENT '评论人昵称',
 `head_pic` varchar(400) DEFAULT NULL COMMENT '评论人头像',
 `content` text COMMENT '评论内容',
 `create_time` datetime DEFAULT NULL COMMENT '评论或回复发表时间',
 PRIMARY KEY (`id`)
) ENGINE=MyISAM AUTO_INCREMENT=148 DEFAULT CHARSET=utf8;