摺疊處於活動狀態時更改課程

Question

如何更改活動摺疊的課程？

示例：從面板默認改變面板的危險

<div class="panel-group" id="accordion"> 
    <div class="panel panel-default"> 
    <div class="panel-heading"> 
     <h4 class="panel-title"> 
     <a data-toggle="collapse" data-parent="#accordion" href="#collapseOne"> 
      Collapsible Group Item #1 
     </a> 
     </h4> 
    </div> 
    <div id="collapseOne" class="panel-collapse collapse in"> 
     <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> 
    <div class="panel panel-default"> 
    <div class="panel-heading"> 
     <h4 class="panel-title"> 
     <a data-toggle="collapse" data-parent="#accordion" href="#collapseTwo"> 
      Collapsible Group Item #2 
     </a> 
     </h4> 
    </div> 
    <div id="collapseTwo" class="panel-collapse collapse"> 
     <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> 
    <div class="panel panel-default"> 
    <div class="panel-heading"> 
     <h4 class="panel-title"> 
     <a data-toggle="collapse" data-parent="#accordion" href="#collapseThree"> 
      Collapsible Group Item #3 
     </a> 
     </h4> 
    </div> 
    <div id="collapseThree" class="panel-collapse collapse"> 
     <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> 
</div> 

和非工作示例的基礎上，引導代碼是在這裏： http://jsfiddle.net/DXVFJ/

感謝

Answer 1

您可以使用shown.bs.collapse和hidden.bs.collapse事件：

shown.bs.collapse - 當用戶看到摺疊元素 （等待CSS轉換爲 完成）時觸發此事件。

和

hidden.bs.collapse - 當一個崩潰元素已 已經從用戶隱藏此事件被觸發（等待CSS過渡完成）。

添加和刪除您的附加類，當頁面啓動時，您可以檢查打開的頁面並設置一個類。

代碼：

$('#accordion').find('.panel-default:has(".in")').addClass('panel-danger'); 

$('#accordion').on('shown.bs.collapse', function (e) { 
    $(e.target).closest('.panel-default').addClass(' panel-danger'); 
}).on('hidden.bs.collapse', function (e) { 
    $(e.target).closest('.panel-default').removeClass(' panel-danger'); 
}) 

演示：http://jsfiddle.net/IrvinDominin/JLR3Q/