Bootstrap 4手风琴具有卡片头活动类

Question

有什么方法可以在折叠面板时向Bootstrap4手风琴添加活动类？

我可以看到面板合拢时没有活动类添加到卡头中。

非常感谢！

下面的手风琴代码

**<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

上面的代码非常好，只有一个例外。我们需要定位上面的元素来添加活动类卡头，而不是定位父类。

正确的jQuery是：

    $(document).ready(function() {

    $('.collapse').on('shown.bs.collapse', function () {
        $(this).prev().addClass('active-acc');
    });

    $('.collapse').on('hidden.bs.collapse', function () {
        $(this).prev().removeClass('active-acc');
    });

});

非常感谢 ！

Answer 2

如果出于样式原因仅需要在CSS中选择活动选项卡，则可以使用以下语法：

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