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php无限级分类实战——评论及回复功能
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php无限级分类实战评论及回复功能

Jun 13, 2016 am 09:04 AM
Function Actual combat

php无限级分类实战——评论及回复功能

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不再提供回复功能,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:

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

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

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

在最后一级评论(这里设置是第三级)关闭回复功能

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

<code class="hljs" php="">/**
*递归获取评论列表
   */
   protected function getCommlist($parent_id = 0,&$result = array()){       
    $arr = M(&#39;comment&#39;)->where(parent_id = &#39;.$parent_id.&#39;)->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;
   }</code>
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(2). 展示评论页面的action

<code class="hljs" lasso="">public function index(){  
    $num =  M(&#39;comment&#39;)->count(); //获取评论总数
    $this->assign(&#39;num&#39;,$num);
      $data=array();
    $data=$this->getCommlist();//获取评论列表
    $this->assign(commlist,$data);
      $this->display(&#39;index&#39;);
  }</code>
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(3).评论页面ajax访问添加评论的action

<code class="hljs" php="">/**
*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[&#39;create_time&#39;]=date(&#39;Y-m-d H:i:s&#39;,time());
        $newcm = M(&#39;comment&#39;);
        $id = $newcm->add($cm);

        $cm[id] = $id;
        $data = $cm;

        $num =  M(&#39;comment&#39;)->count();//统计评论总数
        $data[&#39;num&#39;]= $num;

    }else{
        $data[error] = 0;
    }


    echo json_encode($data);
   }</code>
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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:

<code class="hljs" xml="">
</code>
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<!--发表评论区begin-->

<span>{$num}条评论</span>

<textarea class="txt-commit" replyid="0"></textarea>

<span >发表评论</span>

<!--发表评论区end--><!--评论列表显示区begin--><!-- {$commentlist} -->

<span>全部评论</span>

<!--一级评论列表begin-->

    • <span>{$data.nickname}</span> <span>{$data.create_time}</span>

      {$data.content}

      <!--二级评论begin-->
        • <span>{$child.nickname}</span> <span>{$child.create_time}</span>

          {$child.content}

          <!--三级评论begin-->
            • <span>{$grandson.nickname}</span> <span>{$grandson.create_time}</span>

              {$grandson.content}

          <!--三级评论end-->
      <!--二级评论end-->
<!--一级评论列表end-->

<!--评论列表显示区end-->

(2). 单个评论信息div结构代码

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<span>{$data.nickname}</span> <span>{$data.create_time}</span>

{$data.content}

对应的效果图:

对应的css代码:

<code class="hljs" css="">.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;
}</code>
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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

<code class="hljs" xml="">$(&#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 = </code>
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  • <span>+data.nickname+</span><span>+data.create_time+</span>

    +data.content+

  • ; $(.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 =
    • <span>+data.nickname+</span><span>+data.create_time+</span>

      +data.content+

    • ; }else{//二级评论的回复按钮要添加回复关闭锁属性 newli =
      • <span>+data.nickname+</span><span>+data.create_time+</span>

        +data.content+

      • ; } $(li[comment_id=&#39;+data.parent_id+&#39;]).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

        <code class="hljs" scilab="">//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(&#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
                        divhtml = </code>
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        <textarea class="txt-reply" replyid="2" style="width: 100%; height: 60px;"></textarea>

        提交回复

        ; }else{ divhtml =

        <textarea class="txt-reply" replyid="2" style="width: 100%; height: 60px;"></textarea>

        提交回复

        ; } $(this).after(divhtml); } });

        <code> </code>
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