CSS 如何在关闭手风琴时自动关闭其中所有折叠元素

我们将使用Bootstrap手风琴组件来演示如何在父手风琴中折叠所有子手风琴。手风琴是一种可折叠的组件，可以帮助在网页上显示可展开/折叠的内容。

在本文中，我们将使用Bootstrap 5手风琴组件以嵌套的方式显示一系列可展开/折叠的元素。首先，我们将监听“隐藏”折叠事件，通过将事件监听器附加到父手风琴上。然后，当“隐藏”折叠事件触发时，我们将找到该手风琴内的所有可折叠元素，并从这些元素中移除“show”类，以在界面中隐藏它们。

示例

让我们通过一个示例讨论这种方法，见下面-

附加到手风琴的事件监听器 –

“hide.bs.collapse”

文件名：index.html

<!DOCTYPE html>
<html lang="en">
<head>
   <title>How to automatically close all collapsible elements inside of the accordion when closing the accordion?</title>
   <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-EVSTQN3/azprG1Anm3QDgpJLIm9Nao0Yz1ztcQTwFspd3yD65VohhpuuCOmLASjC" crossorigin="anonymous">
   <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.2/dist/js/bootstrap.bundle.min.js" integrity="sha384-MrcW6ZMFYlzcLA8Nl+NtUVF0sA7MsXsP1UyJoMp4YLEuNSfAP+JcXn/tWtIaxVXM" crossorigin="anonymous"></script>
</head>
<body>
   <h3>How to automatically close all collapsible elements inside of the accordion when closing the accordion?</h3>
   <div class="accordion">
      <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#parent">
         Accordion Item #1
      </button>
      <div id="parent" class="accordion-collapse collapse show">
         <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#child-one">
            Accordion sub Item #1
         </button>
         <div id="child-one" class="accordion-collapse collapse show">
            Accordion sub item 1 - body 1
         </div> 
         <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#child-two">
            Accordion sub Item #1
         </button>
         <div id="child-two" class="accordion-collapse collapse show">
            Accordion sub item 1 - body 1
         </div> 
         <button class="accordion-button" type="button" data-bs-toggle="collapse" data-bs-target="#child-three">
            Accordion sub Item #1
         </button>
         <div id="child-three" class="accordion-collapse collapse show">
            Accordion sub item 1 - body 1
         </div> 
      </div>
   </div>
   <script>
      const parent = document.getElementById('parent') 
      parent.addEventListener('hide.bs.collapse', function() {
         const collapsibleEls = this.querySelectorAll('.collapse.show');
         collapsibleEls.forEach(el => {
            el.classList.remove('show')
         })
      })
   </script>
</body>
</html>