Summarize four ways to implement dynamic tabs in js!
This article will give you a detailed introduction to various methods of dynamically selecting tabs in JS. I hope it will be helpful to friends in need!
JS multiple methods to implement dynamic selection of tabs
First post Producing HTML and CSS is not the point
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<meta name="viewport" content="width=device-width, initial-scale=1.0">
<meta http-equiv="X-UA-Compatible" content="ie=edge">
<title>Document</title>
<link rel="stylesheet" href="css/reset.min.css">
<style>
.tabBox{
margin: 20px auto;
width: 500px;
}
.tabBox ul{
position: relative;
top: 1px;
}
.tabBox ul li{
display: inline-block;
padding: 0 5px;
margin-right:10px;
line-height: 33px;
border: 1px solid #aaa;
cursor: pointer;
}
.tabBox ul li.active{
border-bottom-color:#fff;
/* 当前LI的边框覆盖着DIV的边框，
我们让LI的下边框是背景颜色白色，这样看上去就像没边框了 */
font-weight: bold;
color: lightcoral;
}
.tabBox div{
display: none;
line-height: 148px;
text-align: center;
border: 1px solid #aaa;
}
.tabBox div.active{
display: block;
}
</style>
</head>
<body>
<div id="tabBox">
<ul>
<li>新闻</li>
<li>电影</li>
<li>音乐</li>
</ul>
<div>嘟嘟</div>
<div>滴滴</div>
<div>嘟嘟滴滴</div>
</div>
<script src="js/tab_zy.js"></script>
</body>
</html>[Implementation ideas]
Bind click events to all LI, when clicked For any li, do the second step
You can first make all the classes of LI && p empty (xxx.className=''), and then let the current click This LI and the corresponding p have the active style class
The following is the common part of JS to obtain elements
var oBox = document.getElementById('tabBox'),
oList = oBox.getElementsByTagName('li'),
op = oBox.getElementsByTagName('p');Plan One
var LastIndex = 0 //记录上次所选的LI 选中的索引
for(var i=0;i<oList.length;i++){
oList[i].CurIndex = i
oList[i].onclick = function(){
if(this.CurIndex===LastIndex) return;//=>如果当前点击的索引和上一次索引相同（点击的就是上一个被选中的），我们不做任何事情
oList[LastIndex].className = op[LastIndex].className = '' //=>清空上一次
oList[this.CurIndex].className=op[this.CurIndex].className = 'active'
//=>修改LAST-INDEX值，让当前本选中的索引作为下一次点击要清除的上一次的索引
LastIndex = this.CurIndex
}
}Plan Two:
//=>1.传递对象
for(var i = 0; i<oList.length ; i++){
oList[i].onclick = function(){
ChangeTab(this);
}
}
function ChangeTab(n){
for(var j=0;j<oList.length;j++){
//=>如果当前循环的LI和传递进来点击的那个元素相同，说明当前循环的这个LI就是被点击的，让其有选中样式
if(oList[j]===n){
oList[j].className= op[j].className = 'active'
}else{
//=>不相等，则不是被点击的，我们取消选中样式即可
oList[j].className= op[j].className = ''
}
}
}Plan Three:
for (let i = 0; i < tabList.length; i++) {
tabList[i].onclick=function(){
// 事件绑定：给当前元素的某一个事情绑定一个方法，绑定的时候方法没有执行
// （属于创建一个方法，当在页面中手动触发点击事件的时候绑定的方法才会执行）
changeTab(i);
}
}
// 形参变量：当执行这个方法的时候，会把当前点击的这个LI索引传递过来
function changeTab(n) {
// 1、所有都没有选中样式
for (let i = 0; i < tabList.length; i++) {
tabList[i].className='';
pList[i].className ='';
}
// 2、当前点击的所有选中样式
tabList[n].className='active';
pList[n].className = 'active';
}Plan Four: (JQ implementation)
//当HTML结构都加载完成执行函数
jQuery(function($){
//基于JQ内置EACH机制，给每个LI 都绑定了 点击事件
$('.tabBox>.header>li').on('click',function(){
let index = $(this).index();//获取当前点击LI 的索引
//siblings() 获取兄弟元素
$(this).addClass('active').siblings().removeClass('active').parent().nextAll('p').eq(index).addClass('active').siblings('p').removeClass('active')
});
});Related recommendations: [JavaScript video tutorial]
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