全部关闭时，Bootstrap 手风琴头更小答案

【问题标题】：Bootstrap accordion headers are smaller when all closed全部关闭时，Bootstrap 手风琴头更小
【发布时间】：2019-04-01 14:05:12
【问题描述】：

目前试图让手风琴项目在 Bootstrap 中工作一切都很好，直到我尝试关闭所有手风琴菜单。突然之间，标题比没有折叠时要小得多。

一打开就可以了

当全部关闭时

我使用的是指南提供的默认 html 数据，我的代码是这： https://pastebin.com/MhvXunN3

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

<div class="accordion" id="accordionExample">
  <div class="card">
    <div class="card-header" id="headingOne">
      <h2 class="mb-0">
        <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                        Collapsible Group Item #1
                      </button>
      </h2>
    </div>

    <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
      <div class="card-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="card">
    <div class="card-header" id="headingTwo">
      <h2 class="mb-0">
        <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                        Collapsible Group Item #2
                      </button>
      </h2>
    </div>
    <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">
      <div class="card-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="card">
    <div class="card-header" id="headingThree">
      <h2 class="mb-0">
        <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
                        Collapsible Group Item #3
                      </button>
      </h2>
    </div>
    <div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordionExample">
      <div class="card-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>

<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>

指南中的代码可以在这里找到： https://getbootstrap.com/docs/4.3/components/collapse/#accordion-example

有没有人看到我在这里做错了什么，这让我发疯......

【问题讨论】：

您可能误解了 Bootstrap 中 row 类的用法。你在不需要它的地方使用这个类row。一列 = 无列。使用行类，以防您在其中计划两列或更多列。

标签： html bootstrap-4 accordion

【解决方案1】：

您必须在 .row 中使用一列 (.col-12) 来解决此问题。只需将.accordion 放入一个新的<div> 元素，其类为.col-12，如下所示：

<!doctype html>
<html lang="en">
  <head>
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
    <title>Hello, world!</title>
  </head>
  <body>
    <div class="container">
        <div class="row">
          <div class="col-12">
            <p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Quisquam laboriosam magni mollitia culpa illum doloremque corporis quod quae libero obcaecati? Quam nulla sapiente a voluptatum eos impedit iusto dicta obcaecati. Lorem ipsum dolor sit amet consectetur adipisicing elit. Ullam error voluptate recusandae adipisci quidem. Dolorem, ipsum adipisci ea tenetur eligendi nisi necessitatibus nostrum? Provident maxime iure molestiae impedit, unde dolorem.</p>
          </div>
        </div>
        <div class="row">
          <div class="col-12">
            <div class="accordion" id="accordionExample">
                <div class="card">
                  <div class="card-header" id="headingOne">
                    <h2 class="mb-0">
                      <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                        Collapsible Group Item #1
                      </button>
                    </h2>
                  </div>
             
                  <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
                    <div class="card-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="card">
                  <div class="card-header" id="headingTwo">
                    <h2 class="mb-0">
                      <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                        Collapsible Group Item #2
                      </button>
                    </h2>
                  </div>
                  <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">
                    <div class="card-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="card">
                  <div class="card-header" id="headingThree">
                    <h2 class="mb-0">
                      <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
                        Collapsible Group Item #3
                      </button>
                    </h2>
                  </div>
                  <div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordionExample">
                    <div class="card-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>
        </div>
    </div>
    <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
    <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
    <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
  </body>
</html>

在网格布局中，内容必须放在列中并且只有列可以是行的直接子级。
来源：https://getbootstrap.com/docs/4.3/layout/grid/#how-it-works

【讨论】：

是的，这“有效”，但您的代码中现在有无用的divs。您可以通过完全删除 <div class="row"> 和 <div class="col-12"> 来改进您的代码，结果将是相同的。

【解决方案2】：

摆脱无用的row。这里没有必要。即使在不需要的地方，您也可以使用此类 row。
使用row 类，以防您在其中计划一些列。
仅供参考，这.row 类集：

display: flex
flex-wrap: wrap;
margin-right: -15px;
margin-left: -15px;

这个display: flex 给你带来了麻烦。此外，如果您没有任何 .col init，您也不需要任何负边距。

<!doctype html>
<html lang="en">

<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">

  <title>Hello, world!</title>
</head>

<body>
  <div class="container">
    <!-- Content here -->
    <div class="no-need-of-row">
      <p>Lorem, ipsum dolor sit amet consectetur adipisicing elit. Quisquam laboriosam magni mollitia culpa illum doloremque corporis quod quae libero obcaecati? Quam nulla sapiente a voluptatum eos impedit iusto dicta obcaecati. Lorem ipsum dolor sit amet
        consectetur adipisicing elit. Ullam error voluptate recusandae adipisci quidem. Dolorem, ipsum adipisci ea tenetur eligendi nisi necessitatibus nostrum? Provident maxime iure molestiae impedit, unde dolorem.</p>
    </div>
    <div class="no-need-of-row">
      <div class="accordion" id="accordionExample">
        <div class="card card-bock">
          <div class="card-header" id="headingOne">
            <h2 class="mb-0">
              <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#collapseOne" aria-expanded="true" aria-controls="collapseOne">
                        Collapsible Group Item #1
                      </button>
            </h2>
          </div>

          <div id="collapseOne" class="collapse show" aria-labelledby="headingOne" data-parent="#accordionExample">
            <div class="card-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="card">
          <div class="card-header" id="headingTwo">
            <h2 class="mb-0">
              <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseTwo" aria-expanded="false" aria-controls="collapseTwo">
                        Collapsible Group Item #2
                      </button>
            </h2>
          </div>
          <div id="collapseTwo" class="collapse" aria-labelledby="headingTwo" data-parent="#accordionExample">
            <div class="card-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="card">
          <div class="card-header" id="headingThree">
            <h2 class="mb-0">
              <button class="btn btn-link collapsed" type="button" data-toggle="collapse" data-target="#collapseThree" aria-expanded="false" aria-controls="collapseThree">
                        Collapsible Group Item #3
                      </button>
            </h2>
          </div>
          <div id="collapseThree" class="collapse" aria-labelledby="headingThree" data-parent="#accordionExample">
            <div class="card-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>
  </div>

  <!-- Optional JavaScript -->
  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js" integrity="sha384-UO2eT0CpHqdSJQ6hJty5KVphtPhzWj9WO1clHTMGa3JDZwrnQq4sF86dIHNDz0W1" crossorigin="anonymous"></script>
  <script src="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js" integrity="sha384-JjSmVgyd0p3pXB1rRibZUAYoIIy6OrQ6VrjIEaFf/nJGzIxFDsf4x0xIM+B07jRM" crossorigin="anonymous"></script>
</body>

</html>

【讨论】：