HTML嵌套手风琴

Question

我在许多网站上浏览并找到了一种在HTML中添加嵌套手风琴的方法，如下例所示。

var acc = document.getElementsByClassName("accordion");
var i;

for (i = 0; i < acc.length; i++) {
acc[i].onclick = function() {
    this.classList.toggle("active");
    var panel = this.nextElementSibling;
    if (panel.style.maxHeight){
    panel.style.maxHeight = null;
    } else {
    panel.style.maxHeight = panel.scrollHeight + "5000px";
    } 
}
}

<button class="accordion">Accordion 1</button>
<div class="panel">
    <button class="accordion">Accordion 2</button>
    <div class="panel">
        <button class="accordion">Accordion 3</button>
        <div class="panel">
            <p>
                <li>List 1</li>
                <li>List 2</li>
            </p>
        </div>  
    </div>
</div>

但是当我使用上述方法添加嵌套手风琴时，当我们打开所有手风琴然后折叠最上面的手风琴时，它会折叠但不会折叠。

如果在折叠最外面的手风琴时有一种方法可以折叠所有手风琴，请告诉我。

Answer 1

试着帮忙

$('.toggle').click(function(e) {
  	e.preventDefault();
  
    var $this = $(this);
  
    if ($this.next().hasClass('show')) {
        $this.next().removeClass('show');
        $this.next().slideUp(350);
    } else {
        $this.parent().parent().find('li .inner').removeClass('show');
        $this.parent().parent().find('li .inner').slideUp(350);
        $this.next().toggleClass('show');
        $this.next().slideToggle(350);
    }
});

@import url('https://fonts.googleapis.com/css?family=Pacifico|Open+Sans:300,400,600');
* {
  box-sizing: border-box;
  font-family: 'Open Sans', sans-serif;
  font-weight: 300;
}
a {
  text-decoration: none;
  color: inherit;
}
p {
  font-size: 1.1em;
  margin: 1em 0;
}
.description {
  margin: 1em auto 2.25em;
}
body {
  width: 40%;
  min-width: 300px;
  max-width: 400px;
  margin: 1.5em auto;
  color: #333;
}
h1 {
  font-family: 'Pacifico', cursive;
  font-weight: 400;
  font-size: 2.5em;
}
ul {
  list-style: none;
  padding: 0;
}
ul .inner {
  padding-left: 1em;
  overflow: hidden;
  display: none;
}
ul .inner.show {
  /*display: block;*/
}
ul li {
  margin: .5em 0;
}
ul li a.toggle {
  width: 100%;
  display: block;
  background: rgba(0, 0, 0, 0.78);
  color: #fefefe;
  padding: .75em;
  border-radius: 0.15em;
  transition: background .3s ease;
}
ul li a.toggle:hover {
  background: rgba(0, 0, 0, 0.9);
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.0/jquery.min.js"></script>


<ul class="accordion">
  
 
  
  <li>
    <a class="toggle" href="javascript:void(0);">Item 3</a>
    <ul class="inner">
      <li>
        <a href="#" class="toggle">Open Inner</a>
        <div class="inner">
          <p>
            Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas tempus placerat fringilla. Duis a elit et dolor laoreet volutpat. Aliquam ultrices mauris id mattis imperdiet. Aenean cursus ultrices justo et varius. Suspendisse aliquam orci id dui dapibus
            blandit. In hac habitasse platea dictumst. Sed risus velit, pellentesque eu enim ac, ultricies pretium felis.
          </p>
        </div>
      </li>
      
      <li>
        <a href="#" class="toggle">Open Inner #2</a>
        <div class="inner">
          <p>
            Children will automatically close upon closing its parent.
          </p>
        </div>
      </li>
      
      <li>Option 3</li>
    </ul>
  </li>
  
  <li>
    <a class="toggle" href="javascript:void(0);">Item 4</a>
    <ul class="inner">
      <li>
        <a href="#" class="toggle">Technically any number of nested elements</a>
        <ul class="inner">
          <li>
            <a href="#" class="toggle">Another nested element</a>
            <div class="inner">
              <p>
                As long as the inner element has inner as one of its classes then it will be toggled.
              </p>
              <p>
                Lorem ipsum dolor sit amet, consectetur adipiscing elit. Maecenas tempus placerat fringilla. Duis a elit et dolor laoreet volutpat. Aliquam ultrices mauris id mattis imperdiet. Aenean cursus ultrices justo et varius. Suspendisse aliquam orci id dui dapibus
                blandit. In hac habitasse platea dictumst. Sed risus velit, pellentesque eu enim ac, ultricies pretium felis.
              </p>
            </div>
          </li>
        </ul>
      </li>
      
      <li>Option 2</li>
      
      <li>Option 3</li>
    </ul>
  </li>
</ul>