Summarize four ways to implement dynamic tabs in js!-JS Tutorial-php.cn

Summarize four ways to implement dynamic tabs in js!

藏色散人

Release： 2022-08-06 13:52:18

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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>

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[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(&#39;tabBox&#39;),
    oList = oBox.getElementsByTagName(&#39;li&#39;),
    op = oBox.getElementsByTagName(&#39;p&#39;);

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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 = &#39;&#39;	//=>清空上一次
		oList[this.CurIndex].className=op[this.CurIndex].className = &#39;active&#39;
		//=>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
	}
}

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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 = &#39;active&#39;
		}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 = &#39;&#39;
		}
	}
}

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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=&#39;&#39;;
        pList[i].className =&#39;&#39;;
        
    }
    // 2、当前点击的所有选中样式
    tabList[n].className=&#39;active&#39;;
    pList[n].className = &#39;active&#39;;
}

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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
        $(&#39;.tabBox>.header>li&#39;).on(&#39;click&#39;,function(){
            let index = $(this).index();//获取当前点击LI 的索引
            //siblings()  获取兄弟元素
            $(this).addClass(&#39;active&#39;).siblings().removeClass(&#39;active&#39;).parent().nextAll(&#39;p&#39;).eq(index).addClass(&#39;active&#39;).siblings(&#39;p&#39;).removeClass(&#39;active&#39;)
           
        });
});

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Related recommendations: [JavaScript video tutorial]

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