如何在折叠/折叠时更改Bootstrap手风琴标题

Question

当所有面板折叠时，背景颜色应为白色。面板打开时，面板标题背景颜色应为灰色。我该怎么做，请吗？

 <div class="panel panel-simple"> 
     <div class="panel-heading" role="tab" id="headingOneMaintenance"> 
      <h4 class="panel-title"> 
      <a class="accordion-toggle" role="button" data-toggle="collapse" data-parent="#accordionMaintenance" href="#collapseOneMaintenance" aria-expanded="true" aria-controls="collapseOneMaintenance"> 
       What will you do to prepare my apartment before I move in? 
      </a> 
      </h4> 
     </div> 
     <div id="collapseOneMaintenance" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOneMaintenance"> 
      <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> 

有了这个CSS，我所有的面板是白色的，但是当面板打开，我想报头是灰色的：

.panel-heading { 
    background-color: white;} 

它不必虽然是这个CSS。谢谢！

Answer 1

你可以做一个小的黑客.accordion-toggle与CSS利润率&补白涵盖所有面板尺寸：

摘录如下：

.accordion-toggle { 
 
    background-color: gray; 
 
    display: block; 
 
    padding: 10px; 
 
    margin: -10px -15px; 
 
    border-top-left-radius: 4px; 
 
    border-top-right-radius: 4px; 
 
} 
 

 
.accordion-toggle.collapsed { 
 
    background-color: white; 
 
}

<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css" rel="stylesheet" /> 
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.1.1/jquery.min.js"></script> 
 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> 
 
<div class="panel panel-simple"> 
 
    <div class="panel-heading" role="tab" id="headingOneMaintenance"> 
 
    <h4 class="panel-title"> 
 
     <a class="accordion-toggle" role="button" data-toggle="collapse" data-parent="#accordionMaintenance" href="#collapseOneMaintenance" aria-expanded="true" aria-controls="collapseOneMaintenance"> 
 
     What will you do to prepare my apartment before I move in? 
 
     </a> 
 
    </h4> 
 
    </div> 
 
    <div id="collapseOneMaintenance" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOneMaintenance"> 
 
    <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>

Answer 2

试试这个代码：

$(document).on('click', '.panel-heading', function(){ 
 
    $('.panel-heading').css('background-color', 'grey'); 
 
    if ($(this).find('.accordion-toggle').hasClass('collapsed')) { 
 
     $(this).css('background-color', 'white'); 
 
    } 
 

 
})

.panel-heading { 
 
    background-color: grey;}

<link rel="stylesheet" type="text/css" href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/3.3.7/css/bootstrap.css"> 
 
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> 
 
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script> 
 
<div class="panel panel-simple"> 
 
    <div class="panel-heading" role="tab" id="headingOneMaintenance"> 
 
    <h4 class="panel-title"> 
 
     <a class="accordion-toggle" role="button" data-toggle="collapse" data-parent="#accordionMaintenance" href="#collapseOneMaintenance" aria-expanded="true" aria-controls="collapseOneMaintenance"> 
 
     What will you do to prepare my apartment before I move in? 
 
     </a> 
 
    </h4> 
 
    </div> 
 
    <div id="collapseOneMaintenance" class="panel-collapse collapse in" role="tabpanel" aria-labelledby="headingOneMaintenance"> 
 
    <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>