CSS 如何在关闭手风琴时自动关闭手风琴内的所有可折叠元素

我们将在文章中使用bootstrap的accordion组件来演示如何在父accordion里面折叠所有的子accordion。手风琴是一个可折叠的组件，有助于在网页上显示扩展/折叠类型的内容。

在这篇文章中，我们将使用Bootstrap 5 Accordion组件，以嵌套的方式显示一个可扩展/可折叠元素的列表。现在，首先，我们将通过给父手风琴附加一个事件监听器来监听 “隐藏 “折叠事件。之后，当 “隐藏 “折叠事件被触发时，我们将找到该手风琴内的所有可折叠元素，并因此从这些元素中删除 “显示 “类，以便在用户界面中隐藏它们。

例子

让我们用一个例子来讨论这个方法，下面的例子是

将事件监听器附加到手风琴上 —

"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>