Native js realizes the function of replying to comments
- 2021-07-12 05:08:20
- OfStack
Implementation principle
Function 1. Delete status
You can use the removeChild () method
Feature 2. Top Praise
Judge whether the content of the text is like or not, and do corresponding operation to change the content of the container text storing the number of likes
Feature 3. Reply to comments
Create a new comment and add it to the comment list
Function 4. Like in reply
Judge whether I like it or not and do the corresponding operation
Function 5. Reply or delete
Judge whether to reply or delete the string and do the corresponding operation
The code uses event agent and 3 yuan operation judgment to reduce the amount of code
Each line of code has detailed comments
1 Don't be upset when you see so much code
In fact, you have to look at each function separately, which is a very simple dom operation
1 point digestion, read every 1 line of code
Complete code
Note: Replace the following picture after copying the code to local
<!DOCTYPE html>
<html lang="en">
<head>
<meta http-equiv="Content-Type" content="text/html; charset=utf-8" />
<title>demo</title>
<style>
body,h1,h2,h3,h4,h5,h6,hr,p,blockquote,dl,dt,dd,ul,ol,li,pre,form,fieldset,legend,button,input,textarea,th,td{margin:0;padding:0;border:none; outline: none;}
h1,h2,h3,h4,h5,h6{font-size:100%;}
address,cite,dfn,em,var{font-style:normal;}
code,kbd,pre,samp{font-family:courier new,courier,monospace;}
ul,ol{list-style:none;}
a{text-decoration:none;}
a:hover, a:visited, a:link, a:active{text-decoration:none;}
sup{vertical-align:text-top;}
sub{vertical-align:text-bottom;}
legend{color:#000;}
fieldset,img{border:0;}
button,input,select,textarea{font-size:100%;}
table{border-collapse:collapse;border-spacing:0;}
.clear{clear: both;float: none;height: 0;overflow: hidden;}
body{color:#333; font: 12px/1.3 'Arial','Microsoft YaHei';}
#pn{width: 550px; height: auto; background: #fff; margin: 0 auto; padding: 20px;}
.list0{padding: 20px 0; position: relative; border-top: 1px solid #eee;}
.head{width: 60px; float: left;}
.head img{width: 60px; height: 60px; }
.close{width: 20px; height: 20px; position: absolute; top: 0; right: 0; color: #696e78; font-size: 14px; text-align: center; line-height: 20px;}
.close:hover{color: #eb7350;}
.content{width: 450px; line-height: 20px; font-size: 14px; margin-left: 70px; }
.name{color: #eb7350; }
.pic{margin: 5px 0;}
.good:after{clear:both;content:'';display:block;width:0;height:0;visibility:hidden;}
.good{*zoom:1;}
.date{float:left; color: #808080;}
.good a{float: right; color: #808080;}
.people{background: #F7F7F7; height: 28px; line-height: 28px; padding-left: 10px; margin: 5px 0;}
.comment:after{clear:both;content:'';display:block;width:0;height:0;visibility:hidden;}
.comment{*zoom:1; padding: 10px 0; border-top: 1px solid #eee;}
.comment-left{width: 30px; float: left; display: inline; margin-right: 10px;}
.comment-left img{width: 30px; height: 30px;}
.comment-right{float: left; width: 410px;}
.comment-text{line-height: 18px;}
.comment-text span{color:#eb7350;}
.comment-date{font-size: 12px; line-height: 14px; color: #ccc; position: relative;}
.comment-zan{position: absolute; right: 40px; bottom: 0; color: #808080;}
.comment-dele{position: absolute; right: 0; bottom: 0; color: #808080;}
.hf:after{clear:both;content:'';display:block;width:0;height:0;visibility:hidden;}
.hf{*zoom:1;}
.hf-text{ border: 1px solid #eee; display: block; height: 15px; width: 438px; padding: 5px; resize: none; color: #ccc; font-size:12px;}
.hf-on .hf-text{height: 60px; color: #333; border:1px solid #ff8140;}
.hf-btn{float: right; width: 65px; height: 26px; background: #f7f7f7; color: #ccc; font-size: 12px; display: none;}
.hf-btn-on{background: #ff8140; color: #fff; }
.hf-nub{float: right; padding: 3px 5px; color: #666; display: none;}
.hf-on .hf-btn{display: inline;}
.hf-on .hf-nub{display: inline;}
</style>
</head>
<body>
<ul id="pn">
<li class="list0">
<a class="close" href="javascript:;">X</a>
<div class="head"><img src="images/T1.jpg" alt=""/></div>
<div class="content">
<p class="text"><span class="name">Andy：</span>哈哈哈哈哈谁还没个妈～//@我的朋友是个呆B: 饮水机那个蕾丝罩我给跪了//@8卦_我实在是太CJ了:仿佛看到了自己家</p>
<div class="pic"><img src="images/img1.jpg" alt=""/></div>
<div class="good"><span class="date">02-14 23:01</span><a class="dzan" href="javascript:;">赞</a></div>
<div class="people" total="2980">2980人觉得很赞</div>
<div class="comment-list">
<div class="comment" user="self">
<div class="comment-left"><img src="images/T1.jpg" alt=""/></div>
<div class="comment-right">
<div class="comment-text"><span class="user">老王：</span>我住隔壁我姓王</div>
<div class="comment-date">02-14 22:00
<a class="comment-zan" href="javascript:;" total="23" my="1">23 取消赞</a>
<a class="comment-dele" href="javascript:;">回复</a>
</div>
</div>
</div>
<div class="comment" user="self">
<div class="comment-left"><img src="images/T1.jpg" alt=""/></div>
<div class="comment-right">
<div class="comment-text"><span class="user">我：</span>看哭了留卡号吧</div>
<div class="comment-date">02-14 24:00
<a class="comment-zan" href="javascript:;" total="0" my="0">赞</a>
<a class="comment-dele" href="javascript:;">删除</a>
</div>
</div>
</div>
</div>
<div class="hf">
<textarea type="text" class="hf-text" autocomplete="off" maxlength="100">评论…</textarea>
<button class="hf-btn">回复</button>
<span class="hf-nub">0/100</span>
</div>
</div>
</li>
<li class="list0">
<a class="close" href="javascript:;">X</a>
<div class="head"><img src="images/T2.jpg" alt=""/></div>
<div class="content">
<p class="text"><span class="name">Andy：</span>哈哈哈哈哈谁还没个妈～//@我的朋友是个呆B: 饮水机那个蕾丝罩我给跪了//@8卦_我实在是太CJ了:仿佛看到了自己家</p>
<div class="pic"><img src="images/img1.jpg" alt=""/></div>
<div class="good"><span class="date">02-14 23:01</span><a class="dzan" href="javascript:;">赞</a></div>
<div class="people" total="0" style="display: none;"></div>
<div class="comment-list">
<div class="comment" user="self">
<div class="comment-left"><img src="images/T2.jpg" alt=""/></div>
<div class="comment-right">
<div class="comment-text"><span class="user">我：</span>看哭了留卡号吧</div>
<div class="comment-date">02-14 24:00
<a class="comment-zan" href="javascript:;" total="286" my="1">286 取消赞</a>
<a class="comment-dele" href="javascript:;">删除</a>
</div>
</div>
</div>
</div>
<div class="hf">
<textarea type="text" class="hf-text" autocomplete="off" maxlength="100">评论…</textarea>
<button class="hf-btn">回复</button>
<span class="hf-nub">0/100</span>
</div>
</div>
</li>
</ul>
<script type="text/javascript">
//在页面加载完后立即执行多个函数。
function addloadEvent(func){
var oldonload=window.onload;
if(typeof window.onload !="function"){
window.onload=func;
}
else{
window.onload=function(){
if(oldonload){
oldonload();
}
func();
}
}
}
addloadEvent(b);
function b(){
var pn=document.getElementById("pn");
var lists=pn.children;
//删除当前节点
function remove(node){
node.parentNode.removeChild(node);
}
//上面的点赞
function praisebox(box,el){
//获取赞数量容器
var praise=box.getElementsByClassName("people")[0];
//获取容器当前total值
var total=parseInt(praise.getAttribute("total"));
//获取点击的innerHTML
var txt=el.innerHTML;
//创建1个新的total存储用
var newtotal;
//判断点击的文字内容
if(txt=="赞"){
//total值+1 因为我还没点击赞，所以要点击的时候就多了1个人 total+1
newtotal=total+1;
//判断赞数量 把相应文字放到赞容器里
praise.innerHTML=newtotal==1 ? "我觉得很赞" : "我和" + total +"个人觉得很赞";
el.innerHTML="取消赞";
}
else{
//反之total值-1
newtotal=total-1;
praise.innerHTML=newtotal==0 ? "" : newtotal +"个人觉得很赞";
el.innerHTML="赞";
}
//更新total值
praise.setAttribute("total",newtotal);
//如果没有人点赞容器隐藏
praise.style.display=(newtotal==0) ? "none" : "block";
}
//回复评论
function reply(box){
//获取评论框
var textarea=box.getElementsByTagName("textarea")[0];
//获取包含所有评论的容器
var comment=box.getElementsByClassName("comment-list")[0];
//创建新的评论div
var div=document.createElement("div");
//赋类名
div.className="comment";
//设置属性
div.setAttribute("user","self");
//获取每条评论的innerHTML结构，每次只替换textarea的输入内容和 当前发送时间
var html='<div class="comment-left">'+'<img src="images/T2.jpg" alt=""/>'+'</div>'+
'<div class="comment-right">'+
'<div class="comment-text"><span>我：</span>'+textarea.value+'</div>'+
'<div class="comment-date">'+
getTime()+
'<a class="comment-zan" href="javascript:;" total="0" my="0">赞</a>'+
'<a class="comment-dele" href="javascript:;">删除</a>'+
'</div>'+
'</div>';
//插入到新建的评论div
div.innerHTML=html;
//把新评论插入到评论列表
comment.appendChild(div);
//评论后初始化textarea输入框
textarea.value="评论…";
textarea.parentNode.className="hf";
}
//获取当前时间回复评论时调用
function getTime(){
var t=new Date();
var y=t.getFullYear();
var m=t.getMonth()+1;
var d=t.getDate();
var h=t.getHours();
var mi=t.getMinutes();
m=m<10?"0"+m:m;
d=d<10?"0"+d:d;
h=h<10?"0"+h:h;
mi=mi<10?"0"+mi:mi;
return y+"-"+m+"-"+d+""+h+":"+mi;
}
//回复里点赞
function praiseReply(el){
//获取当前total值 也就是所有点赞数量
var total=parseInt(el.getAttribute("total"));
//获取当前my值 我的点赞
var my=parseInt(el.getAttribute("my"));
//创建新的total
var newtotal;
//判断my=0就是我准备要点赞
if(my==0){
//我点了赞总数量就要+1
newtotal=total+1;
//更新total值
el.setAttribute("total",newtotal);
//更新my值
el.setAttribute("my",1);
//更新文字 就是我点了后 文字就是取消赞了
el.innerHTML=newtotal+" 取消赞";
}else{
//反之-1
newtotal=total-1;
el.setAttribute("total",newtotal);
el.setAttribute("my",0);
el.innerHTML=(newtotal==0)?" 赞":newtotal+" 赞";
}
}
//操作回复
function operateReply(el){
//每条评论
var comment=el.parentNode.parentNode.parentNode;
//整个状态
var box=comment.parentNode.parentNode.parentNode;
//评论框
var textarea=box.getElementsByTagName("textarea")[0];
//名字
var user=comment.getElementsByClassName("user")[0];
//点击的innerHTML
var txt=el.innerHTML;
//判断当前点击的是否为回复
if(txt=="回复"){
//评论框触发焦点事件 也就是变高
textarea.onfocus();
//内容变为回复+当前人的名字
textarea.value="回复 "+user.innerHTML;
//调用键盘事件
textarea.onkeyup();
}else{
//否则就是删除节点
remove(comment);
}
}
//遍历所有状态消息
for(var i=0;i<lists.length;i++){
//全部事件代理
lists[i].onclick=function(e){
//获取当前点击事件
var e=e||window.event;
var el=e.srcElement;
if(!el){
el=e.target;//兼容火狐
}
//判断点击的类名
switch(el.className){
//关闭整个状态
case "close":
remove(el.parentNode);
break;
//上面的点赞
case "dzan":
praisebox(el.parentNode.parentNode.parentNode,el);
break;
//回复评论
case "hf-btn hf-btn-on":
reply(el.parentNode.parentNode.parentNode);
break;
//每条评论中点赞
case "comment-zan":
praiseReply(el);
break;
case "comment-dele":
operateReply(el);
break;
}
}
var textarea=lists[i].getElementsByClassName("hf-text")[0];
//焦点事件
textarea.onfocus=function(){
this.parentNode.className='hf hf-on';
this.value = this.value == '评论…' ? '' : this.value;
}
//失焦事件
textarea.onblur=function(){
if(this.value==''){
this.parentNode.className='hf';
this.value ='评论…';
}
}
//键盘事件
textarea.onkeyup=function(){
var len=this.value.length;
var textParentNode=this.parentNode;
var textBtn=textParentNode.children[1];
var textNub=textParentNode.children[2];
if(len==0 /*|| len>100*/){
textBtn.className="hf-btn";
}else{
textBtn.className="hf-btn hf-btn-on";
/*this.style.color="#333"; */
}
textNub.innerHTML=len+"/100";
}
}
//遍历结束
}
</script>
</body>
</html>