我们可以在引导程序 4 中使用部分折叠概念吗？答案

【问题标题】：Can we use partial collapse concept in bootstrap 4?我们可以在引导程序 4 中使用部分折叠概念吗？
【发布时间】：2018-09-14 13:21:48
【问题描述】：

此代码用于部分内容折叠，但不适用于 bootstrap 4。我做错了什么？

#module {
  width: 500px;
}

#module p.collapse[aria-expanded="false"] {
  display: block;
  height: 40px !important;
  overflow: hidden;
}

#module p.collapsing[aria-expanded="false"] {
  height: 40px !important;
}

#module a.collapsed:after {
  content: '+ Show More';
}

#module a:not(.collapsed):after {
  content: '- Show Less';
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<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/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

<div id="module" class="container">
  <h3>Bacon Ipsum</h3>
  <p class="collapse" id="collapseExample" aria-expanded="false">Bacon ipsum dolor amet doner picanha tri-tip biltong leberkas salami meatball tongue filet mignon landjaeger tail. Kielbasa salami tenderloin picanha spare ribs, beef ribs strip steak jerky cow. Pork chop chicken ham hock beef ribs turkey jerky. Shoulder
    beef capicola doner, tongue tail sausage short ribs andouille. Rump frankfurter landjaeger t-bone, kielbasa doner ham hock shankle venison. Cupim capicola kielbasa t-bone, ball tip chicken andouille venison pork chop doner bacon beef ribs kevin shankle.
    Short loin leberkas tenderloin ground round shank, brisket strip steak ham hock ham.
  </p>
  <a role="button" class="collapsed" data-toggle="collapse" href="#collapseExample" aria-expanded="false" aria-controls="collapseExample"></a>
</div>

【问题讨论】：

你包含了 jQuery.js 和 Bootstrap.js 吗？
您检查过w3schools.com/bootstrap4/bootstrap_ref_js_collapse.asp 吗？你试过一个简单的例子来看看它是否有效吗？

标签： html css bootstrap-4 accordion

【解决方案1】：

在网上搜索了几个小时，终于发现要让上面的代码兼容Bootstrap 4，我们只需要修改部分CSS如下：

#module {
  width: 500px;
}

#module a.collapsed:after {
  content: '+ Show More';
}

#module a:not(.collapsed):after {
  content: '- Show Less';
}

#module #collapseExample.collapse:not(.show) {
  display: block;
  /* height = lineheight * no of lines to display */
  height: 4.5em;
  overflow: hidden;
}

#module #collapseExample.collapsing {
  height: 4.5em;
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<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/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

<div id="module" class="container">
  <h3>Bacon Ipsum</h3>
  <p class="collapse" id="collapseExample" aria-expanded="false">Bacon ipsum dolor amet doner picanha tri-tip biltong leberkas salami meatball tongue filet mignon landjaeger tail. Kielbasa salami tenderloin picanha spare ribs, beef ribs strip steak jerky cow. Pork chop chicken ham hock beef ribs turkey jerky. Shoulder
    beef capicola doner, tongue tail sausage short ribs andouille. Rump frankfurter landjaeger t-bone, kielbasa doner ham hock shankle venison. Cupim capicola kielbasa t-bone, ball tip chicken andouille venison pork chop doner bacon beef ribs kevin shankle.
    Short loin leberkas tenderloin ground round shank, brisket strip steak ham hock ham.
  </p>
  <a role="button" class="collapsed" data-toggle="collapse" href="#collapseExample" aria-expanded="false" aria-controls="collapseExample"></a>
</div>

【讨论】：

【解决方案2】：

我建议保持简单，并将部分文本放在单独的段落中。这将允许您对显示的文本进行非常精确的控制。任何类型的可编程解决方案都将取决于字数、标点符号或简单地以指定长度截断您的文本。

#module {
  width: 500px;
}

#module a.collapsed:after {
  content: '+ Show More';
}

#module a:not(.collapsed):after {
  content: '- Show Less';
}

<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
<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/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>

<div id="module" class="container">
  <h3>Bacon Ipsum</h3>
  <p class="excerpt">Bacon ipsum dolor amet doner picanha tri-tip biltong leberkas salami meatball tongue filet mignon landjaeger tail. Kielbasa salami tenderloin picanha spare ribs, beef ribs strip steak jerky cow. Pork chop chicken ham hock beef ribs turkey jerky.</p>
  <p class="collapse" id="collapseExample" aria-expanded="false"> Shoulder beef capicola doner, tongue tail sausage short ribs andouille. Rump frankfurter landjaeger t-bone, kielbasa doner ham hock shankle venison. Cupim capicola kielbasa t-bone, ball tip chicken andouille venison pork chop doner bacon beef ribs kevin
    shankle. Short loin leberkas tenderloin ground round shank, brisket strip steak ham hock ham.
  </p>
  <a role="button" class="collapsed" data-toggle="collapse" href="#collapseExample" aria-expanded="false" aria-controls="collapseExample"></a>
</div>

【讨论】：

【解决方案3】：

这是我用来部分展开和关闭的内容。这完全适用于 Bootstrap 4。您可以在此处下载示例 HTML / CSS / JavaScript sn-ps：

https://iiiji.com/accordion-partial-collapse-expand-demo-template-bootstrap/

.partialcollapse .collapse {
    display: block;
    height: 120px !important;
    overflow: hidden;
}
.partialcollapse .collapsing {
    height: inherit!important;
}
.partialcollapse .collapse.show {
    height: auto !important;
} 
.partialcollapse .collapse+button:after {
    content: '+ Show More';
}
.partialcollapse .show+button:after, .partialcollapse .collapsing+button:after {
    content: '- Show Less';
}

<div class="accordion partialcollapse" id="partialcollapse">
  <div id="collapse-one" class="collapse" aria-labelledby="headingOne" data-parent="#partialcollapse">
    <h4>Accordion Title</h4>
    <p>Accordion content goes here</p>
  </div>
  <button class="btn btn-link" type="button" data-toggle="collapse" data-target="#collapse-one" aria-expanded="true" aria-controls="collapse-one"> </button>
</div>

【讨论】：