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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