移动端下拉筛选 - 码农教程

示例

image
代码

<!DOCTYPE html>
<html lang="en">
<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>
  <style>
    body {
      margin: 0;
      padding: 0;
    }
    .hide {
      display: none;
    }
    .filter-bar {
      display: flex;
      font-size: #333;
    }
    .filter-item {
      position: relative;
      flex: 1;
      height: 40px;
      line-height: 40px;
      border-bottom: 1px solid #ddd;
      text-align: center;
    }
    .filter-item::after {
      content: '';
      position: absolute;
      top: 0;
      bottom: 0;
      right: 30px;
      margin: auto;
      width: 4px;
      height: 4px;
      border-left: 1px solid #333;
      border-bottom: 1px solid #333;
      transform: rotate(-45deg);
      transition: transform .5s ease;
    }
    .filter-item.active::after  {
      transform: rotate(135deg);
    }
    .filter-item:not(:last-child) {
      border-right: 1px solid #ddd;
    }
    .filter-content .content-item {
      height: 0;
      transition: height .3s ease;
      box-shadow: 0 2px 12px 0 rgba(0, 0, 0, 0.1);
    }
    .filter-content .content-item.active {
      height: 155px;
      overflow: hidden;
    }
    .filter-content .content-list {
      margin: 0;
      padding: 10px;
      height: 50px;
      box-sizing: border-box;
      border-bottom: 1px solid #ddd;
      background: #fff;
    }
    .filter-content .content-list:last-child {
      border: 0;
    }
  </style>
</head>
<body>
  <div class="the-filter">
    <div class="filter-bar">
      <div class="filter-item" data-id="1">测试1</div>
      <div class="filter-item" data-id="2">测试2</div>
      <div class="filter-item" data-id="3">测试3</div>
    </div>
    <div class="filter-content">
      <div class="content-item">
        <div class="content-inner content-inner-1 hide">
          <p class="content-list">test1</p>
          <p class="content-list">test2</p>
          <p class="content-list">test3</p>
        </div>
        <div class="content-inner content-inner-2 hide">
          <p class="content-list">测试1</p>
          <p class="content-list">测试2</p>
          <p class="content-list">测试3</p>
        </div>
        <div class="content-inner content-inner-3 hide">
          <p class="content-list">选项1</p>
          <p class="content-list">选项2</p>
          <p class="content-list">选项3</p>
        </div>
      </div>
    </div>
  </div>

  <script>
    const filterBar = document.querySelector('.filter-bar')
    const contentItem = document.querySelector('.content-item')
    filterBar.onclick = function (e) {
      console.log(e.target)
      clearContentActive()
      contentItem.classList.remove('active')
      if (e.target.classList.contains('active')) {
        e.target.classList.remove('active')
      } else {
        clearFilterActive()
        e.target.classList.add('active')
        contentItem.classList.add('active')
        const currentContent = document.querySelector(`.content-inner-${e.target.dataset.id}`)
        currentContent.classList.remove('hide')
      }

    }

    const filterItems = document.querySelectorAll('.filter-item')
    function clearFilterActive () {
      filterItems.forEach(v => {
        if (v.classList.contains('active')) {
          v.classList.remove('active')
        }
      })
    }

    const contentInner = document.querySelectorAll('.content-inner')
    function clearContentActive () {
      contentInner.forEach(v => {
        if (!v.classList.contains('hide')) {
          v.classList.add('hide')
        }
      })
    }
  </script>
</body>
</html>