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Home  >  Article  >  Backend Development  >  How to implement comment reply function in php

How to implement comment reply function in php

藏色散人
藏色散人Original
2021-09-12 09:57:477086browse

How to implement the comment reply function in php: 1. Design the data table; 2. Obtain the comment list through recursion; 3. Display the action of the comment page; 4. Display the overall structure design of the page; 5. Create a single Comment information p structure code; 6. Set the a label button style for replying to comments.

How to implement comment reply function in php

The operating environment of this article: windows7 system, PHP7.1 version, DELL G3 computer

How does php implement the comment reply function?

php unlimited classification to realize comment and reply function

You often see the comment function under the details page of major forums or news sections, of course not only It is so simple to post a comment directly. You can reply to other people's comments, and others can comment or reply to your reply again. This repeats, theoretically, it can be said to be endless. From a technical perspective, it is easy to think of using infinite classification technology. Store data, use recursion to obtain comment hierarchical structure data, and use ajax to implement comment page interaction. Here we use the thinkphp framework to make a simple demo to practice. In order to simplify the process, the third-level comments will start to stop replying. Of course, as long as you do a little work on this basis The infinite reply function can be realized by modifying it. The main reason is that modifying the view layer style is troublesome and takes some time.

1. Effect demand analysis:

1. You can publish first-level comments directly in the header, and the latest comments are displayed at the top, as shown in the following rendering

2. You can reply to posted comments, and the replies are displayed below the superior comments, forming a hierarchical relationship, as shown in the following rendering

# #3. Page operation details: When the reply button of a comment is clicked, the reply text input box is displayed, and the reply text input boxes of other comments disappear. When the reply button is clicked again, the text box disappears

4. Turn off the reply function at the last level of comments (the setting here is the third level)

5. Instantly display the total number of comments

2. Implementation ideas and details

1. Data table design

##2. Key functions of the controller layer: (1). Recursively obtain the comment list 

/**
*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). Display the action of the comment page

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). Comment page ajax access to add comment 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 layer implementation(1). Display the overall structural design of the page

Actual effect:

##Page html code:

<!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>

<p class="comment-filed">
 <!--发表评论区begin-->
 <p>
 <p class="comment-num">
 <span>{$num}条评论</span>
 </p>
 <p>
 <p>
 <textarea class="txt-commit" replyid="0"></textarea>
 </p>
 <p class="p-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=&#39;&#39;>发表评论</span></a>
 </p> 
 </p>
 </p>
 <!--发表评论区end-->

 <!--评论列表显示区begin-->
 <!-- {$commentlist} -->
 <p class="comment-filed-list" >
 <p><span>全部评论</span></p>
 <p class="comment-list" >
  <!--一级评论列表begin-->
  <ul class="comment-ul"> 
  <volist name="commlist" id="data">   
   <li comment_id="{$data.id}">   
   <p >
   <p>
    <img class="head-pic" src="{$data.head_pic}" alt=""> 
   </p>
   <p class="cm">
    <p class="cm-header">
    <span>{$data.nickname}</span>
    <span>{$data.create_time}</span>
    </p>
    <p class="cm-content">
    <p>
     {$data.content}
    </p>
    </p>
    <p 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>   
    </p> 
   </p>        
   </p>

   <!--二级评论begin-->
   <ul class="children">
   <volist name="data.children" id="child" >    
   <li comment_id="{$child.id}">   
    <p >
    <p>
     <img class="head-pic" src="{$child.head_pic}" alt=""> 
    </p>
    <p class="children-cm">
     <p class="cm-header">
     <span>{$child.nickname}</span>
     <span>{$child.create_time}</span>
     </p>
     <p class="cm-content">
     <p>
      {$child.content}
     </p>
     </p>
     <p class="cm-footer">    
     <a class="comment-reply" replyswitch="off" comment_id="{$child.id}" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >回复</a>
     </p> 
    </p>        
    </p>

    <!--三级评论begin-->
    <ul class="children">
    <volist name="child.children" id="grandson" > 
    <li comment_id="{$grandson.id}">   
     <p >
     <p>
      <img class="head-pic" src="{$grandson.head_pic}" alt=""> 
     </p>
     <p class="children-cm">
      <p class="cm-header">
      <span>{$grandson.nickname}</span>
      <span>{$grandson.create_time}</span>
      </p>
      <p class="cm-content">
      <p>
       {$grandson.content}
      </p>
      </p>
      <p 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> -->
      </p> 
     </p>        
     </p>
    </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-->
 </p> 
 </p>
 <!--评论列表显示区end-->
</p> 
</body>
</html>

(2). The corresponding rendering of a single comment information p structure code 

<p >
 <p>
 <img class="head-pic" src="{$data.head_pic}" alt=""> 
 </p>
 <p class="cm">
 <p class="cm-header">
  <span>{$data.nickname}</span>
  <span>{$data.create_time}</span>
  </p>
 <p class="cm-content">
   <p>
   {$data.content}
   </p>
 </p>
 <p 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>   
 </p> 
 </p>        
</p>

:

## The corresponding css code: 

.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 code

(1). Submit comments: The a label button that submits comments references the style comment-submit, and performs ajax operations in its click event

$(&#39;body&#39;).delegate(&#39;.comment-submit&#39;,&#39;click&#39;,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p 
   //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=&#39;"+data.id+"&#39;><p ><p><img class=&#39;head-pic&#39; src=&#39;"+data.head_pic+"&#39; alt=&#39;&#39;></p><p class=&#39;cm&#39;><p class=&#39;cm-header&#39;><span>"+data.nickname+"</span><span>"+data.create_time+"</span></p><p class=&#39;cm-content&#39;><p>"+data.content+"</p></p><p class=&#39;cm-footer&#39;><a class=&#39;comment-reply&#39; comment_id=&#39;"+data.id+"&#39; href=&#39;javascript:void(0);&#39;>回复</a></p></p></p><ul class=&#39;children&#39;></ul></li>";    
    $(".comment-ul").prepend(newli);
   }else{
    //否则添加到对应的孩子ul列表中    
    if(&#39;off&#39;==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=&#39;"+data.id+"&#39;><p ><p><img class=&#39;head-pic&#39; src=&#39;"+data.head_pic+"&#39; alt=&#39;&#39;></p><p class=&#39;children-cm&#39;><p class=&#39;cm-header&#39;><span>"+data.nickname+"</span><span>"+data.create_time+"</span></p><p class=&#39;cm-content&#39;><p>"+data.content+"</p></p><p class=&#39;cm-footer&#39;></p></p></p><ul class=&#39;children&#39;></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=&#39;"+data.id+"&#39;><p ><p><img class=&#39;head-pic&#39; src=&#39;"+data.head_pic+"&#39; alt=&#39;&#39;></p><p class=&#39;children-cm&#39;><p class=&#39;cm-header&#39;><span>"+data.nickname+"</span><span>"+data.create_time+"</span></p><p class=&#39;cm-content&#39;><p>"+data.content+"</p></p><p class=&#39;cm-footer&#39;><a class=&#39;comment-reply&#39; comment_id=&#39;"+data.id+"&#39; href=&#39;javascript:void(0);&#39; replyswitch=&#39;off&#39; >回复</a></p></p></p><ul class=&#39;children&#39;></ul></li>";
    }    
    $("li[comment_id=&#39;"+data.parent_id+"&#39;]").children("ul").prepend(newli);
   }

   }else{
   //有错误信息
   alert(data.error);
   }

  }
  });
 }


 });
(2). Reply to comments: The a label button that replies to comments references the style comment-reply, and displays or hides the comment input box in its click event 

//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p已经存在,去除掉
  $(this).next().remove();
  }else{//添加回复p
  $(".comment-reply").next().remove();//删除已存在的所有回复p 
  //添加当前回复p
  var parent_id = $(this).attr("comment_id");//要回复的评论id

  var phtml = "";
  if(&#39;off&#39;==$(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"
  phtml = "<p class=&#39;p-reply-txt&#39; style=&#39;width:98%;padding:3px;&#39; replyid=&#39;2&#39;><p><textarea class=&#39;txt-reply&#39; replyid=&#39;2&#39; style=&#39;width: 100%; height: 60px;&#39;></textarea></p><p style=&#39;margin-top:5px;text-align:right;&#39;><a class=&#39;comment-submit&#39; parent_id=&#39;"+parent_id+"&#39; style=&#39;font-size:14px;text-decoration:none;background-color:#63B8FF;&#39; href=&#39;javascript:void(0);&#39; replyswitch=&#39;off&#39; >提交回复</a></p></p>";
  }else{
  phtml = "<p class=&#39;p-reply-txt&#39; style=&#39;width:98%;padding:3px;&#39; replyid=&#39;2&#39;><p><textarea class=&#39;txt-reply&#39; replyid=&#39;2&#39; style=&#39;width: 100%; height: 60px;&#39;></textarea></p><p style=&#39;margin-top:5px;text-align:right;&#39;><a class=&#39;comment-submit&#39; parent_id=&#39;"+parent_id+"&#39; style=&#39;font-size:14px;text-decoration:none;background-color:#63B8FF;&#39; href=&#39;javascript:void(0);&#39;>提交回复</a></p></p>";
  }  
  $(this).after(phtml);
  }
 });

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