twitter-bootstrap - 带有卡片头事件类的 Bootstrap 4 Accordion

Question

有没有办法在面板折叠时向 Bootstrap4 Accordion 添加事件类？

我可以看到面板折叠时没有事件类被添加到卡片标题中。

非常感谢!

下面的 Accordion 代码

**<div id="accordion" role="tablist">  
  <div class="card">  
    <div class="card-header" role="tab" id="headingOne">  
      <h5 class="mb-0">  
        <a data-toggle="collapse" href="#collapseOne" role="button" aria-expanded="true" aria-controls="collapseOne">  
          Collapsible Group Item #1  
        </a>  
      </h5>  
    </div>  

    <div id="collapseOne" class="collapse show" role="tabpanel" aria-labelledby="headingOne" data-parent="#accordion">  
      <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" role="tab" id="headingTwo">
      <h5 class="mb-0">  
        <a class="collapsed" data-toggle="collapse" href="#collapseTwo" role="button" aria-expanded="false" aria-controls="collapseTwo">  
          Collapsible Group Item #2
        </a>  
      </h5>  
    </div>  
    <div id="collapseTwo" class="collapse" role="tabpanel" aria-labelledby="headingTwo" data-parent="#accordion">  
      <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" role="tab" id="headingThree">  
      <h5 class="mb-0">  
        <a class="collapsed" data-toggle="collapse" href="#collapseThree" role="button" aria-expanded="false" aria-controls="collapseThree">  
          Collapsible Group Item #3  
        </a>  
      </h5>  
    </div>  
    <div id="collapseThree" class="collapse" role="tabpanel" aria-labelledby="headingThree" data-parent="#accordion">  
      <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>**

Answer 1

如果您只需要在 CSS 中出于样式原因选择事件选项卡，则可以使用以下语法:

.card-header .btn[aria-expanded=true] {
color: #fff;
background-color: #32bdb6;
}