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); } });三、完整代码免费下载
php无限级分类实现评论及回复
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