如何使此代码从项目中删除类名称为GeteLementsByClassName，并使该手风琴按照我的要求工作

Question

我正在尝试使用纯JS制作一项手风琴。我走了一半。我有三个带有文本和按钮的容器。我希望当我单击按钮 ->段落旁边的段落时，我希望它们以这种方式工作。当您单击另一个按钮时，它将发生在下一个按钮上，但是如果有一些打开的段落，它将滑下/关闭。

我已经打开了 - 但是当我单击另一个时，如果已经打开一个，它将无法关闭。我试图通过以下代码使其活着：

<section class="accordions">
    <button class="accordion">Lorem ipsum</button>
    <div class="accordion-content">
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo, ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
      </p>
    </div>
    <button class="accordion">Lorem ipsum</button>
    <div class="accordion-content">
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo, ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
      </p>
    </div>
    <button class="accordion">Lorem ipsum</button>
    <div class="accordion-content">
      <p>
        Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo, ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
      </p>
    </div>
  </section>```

let accordions = document.getElementsByClassName("accordion");
for (let i = 0; i < accordions.length; i++) {
  accordions[i].onclick = function() {
    if (accordions.className === 'is-open') {
      for (let i = 0; i < accordions.length; i++) {
        accordions[i].classList.remove('is-open');
      }
    }
    this.classList.toggle('is-open');
    let content = this.nextElementSibling;
    if (content.style.maxHeight) {
      content.style.maxHeight = null;
    } else {   
      content.style.maxHeight = content.scrollHeight + "px";
    }
  }
}

But those opened paragraphs won't close themselfs. Cheers!

Answer 1

probelm是您在兄弟姐妹上设置了Maxheight，但在下一个按钮上不将其删除，请单击

let accordions = document.getElementsByClassName("accordion");
for (let i = 0; i < accordions.length; i++) {
  accordions[i].onclick = function() {
    for (let i = 0; i < accordions.length; i++) {
      
      /****************added lines********************/
      let content = accordions[i].nextElementSibling;
      if (content.style.maxHeight) {
        content.style.maxHeight = null;
      }
      accordions[i].classList.remove('is-open');
    }
    this.classList.toggle('is-open');
    let content = this.nextElementSibling;
    if (content.style.maxHeight) {
      content.style.maxHeight = null;
    } else {
      content.style.maxHeight = content.scrollHeight + "px";
    }
  }
}

button.accordion {
  background: white;
  border: none;
  outline: none;
  text-align: left;
  padding: 15px 20px;
  cursor: pointer;
}
.accordion-content {
  background-color: white;
  padding: 0 20px;
  max-height: 0;
  overflow: hidden;
  transition: max-height 0.2s ease-in-out;
}

<section class="accordions">
  <button class="accordion">Lorem ipsum</button>
  <div class="accordion-content">
    <p>
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo, ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
    </p>
  </div>
  <button class="accordion">Lorem ipsum</button>
  <div class="accordion-content">
    <p>
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo, ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
    </p>
  </div>
  <button class="accordion">Lorem ipsum</button>
  <div class="accordion-content">
    <p>
      Lorem ipsum dolor sit amet, consectetur adipisicing elit. Quas deleniti molestias necessitatibus quaerat quos incidunt! Quas officiis repellat dolore omnis nihil quo, ratione cupiditate! Sed, deleniti, recusandae! Animi, sapiente, nostrum?
    </p>
  </div>
</section>

Answer 2

下面的代码应解决您的问题：

    <div class="container">
      <div class="panel-group" id="accordion" role="tablist" aria-multiselectable="true">
        <div class="panel panel-default">
          <div class="panel-heading" role="tab" id="headingOne">
            <h4 class="panel-title">
            <a role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
              Collapsible Group Item #1
            </a>
          </h4>
          </div>
          <div id="collapseOne" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOne">
            <div class="panel-body">
              Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird
              on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table,
              raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
            </div>
          </div>
        </div>
        <div class="panel panel-default">
          <div class="panel-heading" role="tab" id="headingTwo">
            <h4 class="panel-title">
            <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
              Collapsible Group Item #2
            </a>
          </h4>
          </div>
          <div id="collapseTwo" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingTwo">
            <div class="panel-body">
              Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird
              on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table,
              raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
            </div>
          </div>
        </div>
        <div class="panel panel-default">
          <div class="panel-heading" role="tab" id="headingThree">
            <h4 class="panel-title">
            <a class="collapsed" role="button" data-toggle="collapse" data-parent="#accordion" href="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
              Collapsible Group Item #3
            </a>
          </h4>
          </div>
          <div id="collapseThree" class="panel-collapse collapse" role="tabpanel" aria-labelledby="headingThree">
            <div class="panel-body">
              Anim pariatur cliche reprehenderit, enim eiusmod high life accusamus terry richardson ad squid. 3 wolf moon officia aute, non cupidatat skateboard dolor brunch. Food truck quinoa nesciunt laborum eiusmod. Brunch 3 wolf moon tempor, sunt aliqua put a bird
              on it squid single-origin coffee nulla assumenda shoreditch et. Nihil anim keffiyeh helvetica, craft beer labore wes anderson cred nesciunt sapiente ea proident. Ad vegan excepteur butcher vice lomo. Leggings occaecat craft beer farm-to-table,
              raw denim aesthetic synth nesciunt you probably haven't heard of them accusamus labore sustainable VHS.
            </div>
          </div>
        </div>
      </div>
    </div>

CSS-FILE：

body {
  color: #6a6c6f;
  background-color: #f1f3f6;
  margin-top:30px;
}
.container {
  max-width: 960px;
}
.panel-default>.panel-heading {
  color: #333;
  background-color: #fff;
  border-color: #e4e5e7;
  padding: 0;
  -webkit-user-select: none;
  -moz-user-select: none;
  -ms-user-select: none;
  user-select: none;
}
.panel-default>.panel-heading a {
  display: block;
  padding: 10px 15px;
}
.panel-default>.panel-heading a:after {
  content: "";
  position: relative;
  top: 1px;
  display: inline-block;
  font-family: 'Glyphicons Halflings';
  font-style: normal;
  font-weight: 400;
  line-height: 1;
  -webkit-font-smoothing: antialiased;
  -moz-osx-font-smoothing: grayscale;
  float: right;
  transition: transform .25s linear;
  -webkit-transition: -webkit-transform .25s linear;
}
.panel-default>.panel-heading a[aria-expanded="true"] {
  background-color: #eee;
}
.panel-default>.panel-heading a[aria-expanded="true"]:after {
  content: "2212";
  -webkit-transform: rotate(180deg);
  transform: rotate(180deg);
}
.panel-default>.panel-heading a[aria-expanded="false"]:after {
  content: "02b";
  -webkit-transform: rotate(90deg);
  transform: rotate(90deg);
}