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Web APIs comprehensive case -tab column switching - dark horse programmer

2022-06-30 22:03:00 【Dark horse programmer official】

Notes updated in the early stage ：  Web API Basic cognition /    obtain DOM Elements  /   Set up / modify DOM Element content and element attributes  /  Timer - Intermittent function   /  The basis of the event   /     Higher order function  /  Environment object
Have learned the above contents , Today, let's make a comprehensive case ：Tab Bar Toggle
 
demand ： Click on different tabs , The bottom can be displayed Different content

analysis ：

①： Click the current tab , Currently added class , The rest of the brothers remove the class , Exclusive thoughts
②： All the module boxes below are hidden , The current module displays

html Code ：
<!DOCTYPE html>
<html>

<head lang="en">
  <meta charset="UTF-8" />
  <title></title>
  <style type="text/css">
    * {
      margin: 0;
      padding: 0;
    }

    ul {
      list-style: none;
    }

    .wrapper {
      width: 1000px;
      height: 475px;
      margin: 0 auto;
      margin-top: 100px;
    }

    .tab {
      border: 1px solid #ddd;
      border-bottom: 0;
      height: 36px;
      width: 320px;
    }

    .tab li {
      position: relative;
      float: left;
      width: 80px;
      height: 34px;
      line-height: 34px;
      text-align: center;
      cursor: pointer;
      border-top: 4px solid #fff;
    }

    .tab span {
      position: absolute;
      right: 0;
      top: 10px;
      background: #ddd;
      width: 1px;
      height: 14px;
      overflow: hidden;
    }

    .products {
      width: 1002px;
      border: 1px solid #ddd;
      height: 476px;
    }

    .products .main {
      float: left;
      display: none;
    }

    .products .main.active {
      display: block;
    }

    .tab li.active {
      border-color: red;
      border-bottom: 0;
    }
  </style>
</head>

<body>
  <div class="wrapper">
    <ul class="tab">
      <li class="tab-item active"> Big international card <span>◆</span></li>
      <li class="tab-item"> National makeup brand <span>◆</span></li>
      <li class="tab-item"> Cleaning products <span>◆</span></li>
      <li class="tab-item"> Men's Boutique </li>
    </ul>
    <div class="products">
      <div class="main active">
        <a href="###"><img src="imgs/guojidapai.jpg" alt="" /></a>
      </div>
      <div class="main">
        <a href="###"><img src="imgs/guozhuangmingpin.jpg" alt="" /></a>
      </div>
      <div class="main">
        <a href="###"><img src="imgs/qingjieyongpin.jpg" alt="" /></a>
      </div>
      <div class="main">
        <a href="###"><img src="imgs/nanshijingpin.jpg" alt="" /></a>
      </div>
    </div>
  </div>

  <script>
    // 0.  Get elements 
    //  Get all the little li  
    let lis = document.querySelectorAll('.tab .tab-item')
    let divs = document.querySelectorAll('.products .main')
    // 1.  Head tab Column switching module 
    // 1.1  First give 4 Small li Add click event 
    for (let i = 0; i < lis.length; i++) {
      lis[i].addEventListener('click', function () {
        // console.log(11)
        //  Find the old active  class , Remove  
        document.querySelector('.tab .active').classList.remove('active')
        //  Add the current element 
        this.classList.add('active')

        // 2.  Show hidden modules at the bottom    Be sure to write in the click event 
        document.querySelector('.products .active').classList.remove('active')

        // div The one corresponding to the serial number plus active 
        divs[i].classList.add('active')
      })
    }


  </script>

</body>

</html>

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