Of Stack

Native js realizes the full text function of news list expansion and

  • 2021-07-13 03:49:54
  • OfStack

Key points of knowledge

1. The implementation principle is very simple. Click the a tag to set the display attribute of div to hide or display.

Mainly to dom operation master.

2. Required dom operations:

parentNode Get Parent Element

nextSibling Gets the next immediate node

previousSibling Gets the last immediately following node

3. Precautions:

Consider that when you click Expand Full Text, other expanded full texts should be put away.

When using nextSibling to get the next node, the judgment of different browsers is different

Some get elements, and some get newline characters or spaces, so here we need to use nodeType to judge that the data type nodeType under 1 only returns numbers 1, 2 and 3

Only when 1 is returned is the element node obtained

(I didn't consider this problem when I did it, and I thought there was something wrong for a long time.)

Also, because there is no dom operation in js to get all the elements in the same class as in jquery, I wrote an siblings myself (elm)

It can also be used in the future, and it will be easy to work

Complete code 


<!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;}
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{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: 650px; height: auto; background: #fff; margin: 0 auto; padding: 5px;}
#list0{margin-bottom: 10px;}
.title{ font-weight: bold; font-size: 14px; margin-bottom: 7px;}
.time{color: #808080; margin-bottom: 2px;}
.content{display: none; padding: 1px 0 3px; line-height: 23px; font-size: 14px; }

.btm{text-align: right; height: 30px; }
.hidd{ color: #eb7350; margin-left: 5px; }
.show{ color: #eb7350; margin-left: 5px; }
.zy{padding: 1px 0 3px; line-height: 23px; font-size: 14px;}
</style> 
</head> 
<body>
 <div id="pn">
 <div id="list0">
 <p class="title">Jackie吉吉</p>
 <p class="time">12月3日 20:49 来自 +niPhone 6s</p>
 <p class="zy">感谢@马路口的YY 今天的款待！1直觉得你们两口子颜值又高人又有趣，又都是高材生，认识你们真的很是很幸运的1件事！~ 终于修成正果了呀~祝福你们新婚快乐白头偕老~ 感谢...<a class="show" href="#">展开全文</a></p>
 <div class="content">感谢@马路口的YY 今天的款待！1直觉得你们两口子颜值又高人又有趣，又都是高材生，认识你们真的很是很幸运的1件事！~ 终于修成正果了呀~祝福你们新婚快乐白头偕老~ 感谢@SNH48-杨韫玉-- 让我们相识[偷乐]以后也1起去看公演呀~ 哪个队都成。
 <a href="#" class="hidd">收起全文</a>
 </div>
 </div>

 <div id="list0">
 <p class="title">高晓松</p>
 <p class="time">44分钟前 来自 微博 weibo.com</p>
 <p class="zy">波澜壮阔的独立斗争，风起云涌的解放运动，卡斯特罗泼墨挥毫1人写就半部古巴史。戴名表开豪车上名校，亲美富2代卡斯特罗早早走上革命之路竟是由基因决定？艳福不浅，老卡又如何能在有生之年睡完传闻中的35000个女人？高晓松用数据还原真实的古巴，看今日...<a class="show" href="#">展开全文</a></p>
 <div class="content">波澜壮阔的独立斗争，风起云涌的解放运动，卡斯特罗泼墨挥毫1人写就半部古巴史。戴名表开豪车上名校，亲美富2代卡斯特罗早早走上革命之路竟是由基因决定？艳福不浅，老卡又如何能在有生之年睡完传闻中的35000个女人？高晓松用数据还原真实的古巴，看今日的它究竟是落后贫穷还是盛世繁华：L晓松奇谈之革命领袖卡斯特罗的传奇1生
 <a href="#" class="hidd">收起全文</a>
 </div>
 </div>
 <div id="list0">
 <p class="title">王尼玛</p>
 <p class="time">12月7日 12:30 来自 微博weibo.com</p>
 <p class="zy">已退役的美国休斯顿德州人橄榄球队的外接手安德烈・约翰逊，为12位由儿童保护服务组织选出的孩子买圣诞节玩具，孩子们可以在80秒内...<a class="show" href="#">展开全文</a></p>
 <div class="content">已退役的美国休斯顿德州人橄榄球队的外接手安德烈・约翰逊，为12位由儿童保护服务组织选出的孩子买圣诞节玩具，孩子们可以在80秒内选择他们喜欢的任何玩具，最终这些玩具花费19144.58美元，慷慨！好了好了别闹了，论飙车还是应该老司机出马！
 <a href="#" class="hidd">收起全文</a>
 </div>
 </div>
 </div>
 <script type="text/javascript"> 
 //在页面加载完后立即执行多个函数方案。
 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);
 //在页面加载完后立即执行多个函数方案结束。
 //获取同级所有元素开始
 function siblings(elm) {
 var a = [];
 var p = elm.parentNode.children;
 for(var i =0,pl= p.length;i<pl;i++){
 if(p[i] !== elm) a.push(p[i]);
 }
 return a;
 }
 //获取同级所有元素结束
 function b(){
 //获取查看全文的a标签
 var show=document.getElementsByClassName("show");
 //遍历a
 for(var i=0;i<show.length;i++){
 show[i].onclick=function(){
 //找到a的父级
 var father=this.parentNode;
 //设置隐藏
 father.style.display="none";
 //找到父级的下1个节点
 var next=father.nextSibling;
 //判断下1个节点的数据类型，如果不是1（元素节点），那就接着往下找
 if(next.nodeType!=1){
 next=next.nextSibling;
 }
 //正文显示
 next.style.display="block";
 //获取整个list0
 var ff=this.parentNode.parentNode;
 //获取除去list0的所有同级元素
 var bro=siblings(ff);
 for(var y=0;y<bro.length;y++){
 //获取每个list0里的第1个content类名
 var w=bro[y].getElementsByClassName("content")[0];
 //获取content类名的前1个节点
 var wt=w.previousSibling;
 //判断前1个节点的数据类型，如果不是1（元素节点），那就接着往上找
 if(wt.nodeType!=1){
 wt=wt.previousSibling;
 }
 //同级摘要部分显示
 wt.style.display="block";
 //同级全文部分隐藏
 w.style.display="none";
 }  
 }
 }
 //下面就是点击收回全文的部分与展开原理1样
 var hidd=document.getElementsByClassName("hidd");
 for(var i=0;i<hidd.length;i++){
 hidd[i].onclick=function(){
 var fafa=this.parentNode;
 fafa.style.display="none";
 var pre=fafa.previousSibling;
 if(pre.nodeType!=1){
 pre=pre.previousSibling;
 }
 pre.style.display="block";
 }
 }
 } 
 </script>
</body> 
</html>
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