php无限级分类实现评论及回复功能

时间:2022-07-27
本文章向大家介绍php无限级分类实现评论及回复功能,主要内容包括其使用实例、应用技巧、基本知识点总结和需要注意事项,具有一定的参考价值,需要的朋友可以参考一下。

经常在各大论坛或新闻板块详情页面下边看到评论功能,当然不单单是直接发表评论内容那么简单,可以对别人的评论进行回复,别人又可以对你的回复再次评论或回复,如此反复,理论上可以说是没有休止,从技术角度分析很容易想到运用无限级分类技术存储数据,运用递归获取评论层级结构数据,运用ajax实现评论页面交互,这里用thinkphp框架做个简单的demo练练手,为了简化流程这里第三级评论开始停止回复,当然只要在这个基础上稍作修改就可以实现无限回复功能,主要是view层样式修改较麻烦,需花些时间。

一、效果需求分析:

1.在头部可以直接发布一级评论,最新发表的评论显示在最上面,如下效果图

2.对发表的评论可以回复,回复显示在上级评论下边,形成层级关系,如下效果图

3.页面操作细节:点击某个评论的回复按钮时,显示回复文本输入框,同时其他评论的回复文本输入框消失,当再次点击该回复按钮时,该文本框消失

4.在最后一级评论(这里设置是第三级)关闭回复功能

5.即时显示评论总数

二、实现思路及细节

1.数据表设计

2.controller层关键函数:

(1). 递归获取评论列表

/**
*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;
 }

(2). 展示评论页面的action

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');
 }

(3).评论页面ajax访问添加评论的action

/**
*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);
 }

3.view层实现

(1). 展示页面的整体结构设计

实际效果:

页面html代码:

<!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无限级分类实战————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 {$num}条评论</span 
</div 
<div 
<div 
<textarea class="txt-commit" replyid="0" </textarea 
</div 
<div class="div-txt-submit" 
<a class="comment-submit" parent_id="0" style="" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow"  <span style='' 发表评论</span </a 
</div  
</div 
</div 
<!--发表评论区end-- 
<!--评论列表显示区begin-- 
<!-- {$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}" alt=""  
</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" 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}" alt=""  
</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" 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}" alt=""  
</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" 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 

(2). 单个评论信息div结构代码

<div  
<div 
<img class="head-pic" src="{$data.head_pic}" alt=""  
</div 
<div class="cm" 
<div class="cm-header" 
<span {$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" rel="external nofollow"  回复</a    
</div  
</div         
</div 

对应的效果图:

对应的css代码:

.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;
}

4. JS代码

(1). 提交评论:提交评论的a标签按钮引用了样式comment-submit,在其点击事件中进行ajax操作

$('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+"' alt='' </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);' 回复</a </div </div </div <ul class='children' </ul </li ";    
$(".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+"' alt='' </div <div class='children-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' </div </div </div <ul class='children' </ul </li ";
}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+"' alt='' </div <div class='children-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);' replyswitch='off'  回复</a </div </div </div <ul class='children' </ul </li ";
}    
$("li[comment_id='"+data.parent_id+"']").children("ul").prepend(newli);
}
}else{
//有错误信息
alert(data.error);
}
}
});
}
});

(2).回复评论:回复评论的a标签按钮引用了样式comment-reply,在其点击事件中进行显示或隐藏评论输入框的操作

//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);
}
});

以上就是本文的全部内容,希望对大家的学习有所帮助。