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="https://www.atool.online/Public/css/comment.css" rel="external nofollow" > <script type="text/javascript" src="https://www.atool.online/Public/js/jquery-1.11.3.min.js" ></script> <script type="text/javascript" src="https://www.atool.online/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="{$data.id}"> <div > <div> <img class="head-pic" src="https://www.atool.online/article/{$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="{$child.id}"> <div > <div> <img class="head-pic" src="https://www.atool.online/article/{$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="{$grandson.id}"> <div > <div> <img class="head-pic" src="https://www.atool.online/article/{$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> {$grandson.content} </p> </div> <div class="cm-footer"> <!-- <a class="comment-reply" comment_id="1" href="javascript:void(0);" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" rel="external nofollow" >回复</a> --> </div> </div> </div> </li> </volist> </ul> <!--三级评论end--> </li> </volist> </ul> <!--二级评论end--> </li> </volist> </ul> <!--一级评论列表end--> </div> </div> <!--评论列表显示区end--> </div> </body> </html>
(2). 单个评论信息div结构代码
<div > <div> <img class="head-pic" src="https://www.atool.online/article/{$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); } });
三、完整代码免费下载
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