JS实现tab选项卡效果

2020-03-08  本文已影响0人  知名大学士
效果图

思路

当我们点击按钮时改变点击按钮的背景颜色恢复其他按钮的颜色,同时还要显示出对应tab卡。

代码

HTML

首先我们建立简单的HTML结构,包含三个按钮和三个div

<div class="box">
  <div class="btns">
    <button class="active">1</button>
    <button>2</button>
    <button>3</button>
  </div>
  <div class="content">
    <div class="con active">1</div>
    <div class="con">2</div>
    <div class="con">3</div>
  </div>
</div>

CSS

这里我们分别给按钮和tabative属性,通过添加和去掉active来改变相应的样式。

.box {
            width: 400px;
            height: 200px;
            border: 2px solid gray;
            margin: 0 auto;
            overflow: hidden;
        }

        .content {
            height: 180px;
            text-align: center;
            line-height: 180px;
            font-size: 100px;
            position: relative;
        }

        .con {
            width: 100%;
            height: 100%;
            position: absolute;
            background: #aaa;
            display: none;
        }

        button.active {
            color: #fff;
            background: grey;
        }

        .con.active {
            display: block;
        }

JS实现

首先我们获取到三个按钮和三个div

var btns = document.querySelector(".btns").children;
var content = document.querySelector(".content").children;

移除类名方法:思路是我们遍历传入的DOM数组,使用split()将每一个的class分割成数组,然后查找是否存在需要删除的className,如果存在则记录下标,然后删除对应class

function removeClass(ele_list, className){
            for(var i = 0; i < ele_list.length; i++){
                var class_arr = ele_list[i].className.split(" ");
                var index = class_arr.indexOf(className);
                if(index !== -1){
                    class_arr.splice(index, 1);
                    ele_list[i].className = class_arr.join("");
                }
            }
        }

添加类名方法

function addClass(ele, className){
  ele.className += " " + className;
}

添加按钮事件:遍历得到的所有按钮,给每个按钮添加点击事件。当按钮被点击时,移除所有节点的active类,然后给被点击的按钮和对应的tabdiv添加active类。

for (var i = 0; i < btns.length; i++) {
            btns[i].index = i;
            console.log(btns[i]);
            btns[i].onclick = function () {
                removeClass(btns, "active");
                removeClass(content, "active");
                // this.className += " active";
                addClass(this, "active");
                addClass(content[this.index], "active");
            }
        }

完整代码

<!DOCTYPE html>
<html lang="en">

<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
    <style>
        .box {
            width: 400px;
            height: 200px;
            border: 2px solid gray;
            margin: 0 auto;
            overflow: hidden;
        }

        .content {
            height: 180px;
            text-align: center;
            line-height: 180px;
            font-size: 100px;
            position: relative;
        }

        .con {
            width: 100%;
            height: 100%;
            position: absolute;
            background: #aaa;
            display: none;
        }

        button.active {
            color: #fff;
            background: grey;
        }

        .con.active {
            display: block;
        }
    </style>
</head>

<body>
    <div class="box">
        <div class="btns">
            <button class="active">1</button>
            <button>2</button>
            <button>3</button>
        </div>
        <div class="content">
            <div class="con active">1</div>
            <div class="con">2</div>
            <div class="con">3</div>
        </div>
    </div>
    <script>
        var btns = document.querySelector(".btns").children;
        var content = document.querySelector(".content").children;
        function removeClass(ele_list, className){
            for(var i = 0; i < ele_list.length; i++){
                var class_arr = ele_list[i].className.split(" ");
                var index = class_arr.indexOf(className);
                if(index !== -1){
                    class_arr.splice(index, 1);
                    ele_list[i].className = class_arr.join("");
                }
            }
        }
        function addClass(ele, className){
            ele.className += " " + className;
        }
        for (var i = 0; i < btns.length; i++) {
            btns[i].index = i;
            console.log(btns[i]);
            btns[i].onclick = function () {
                removeClass(btns, "active");
                removeClass(content, "active");
                // this.className += " active";
                addClass(this, "active");
                addClass(content[this.index], "active");
            }
        }
    </script>
</body>

</html>
上一篇下一篇

猜你喜欢

热点阅读