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我正在尝试添加随着黑光搜索方面折叠并重新打开时改变方向的箭头图标，如下所示：http: //www.bootply.com/88286该图标出现但折叠时不会改变。以下是每个方面组或“面板面板默认”div 的部分内容

<div class="panel panel-default facet_limit blacklight-<%= facet_field.field.parameterize %> <%= 'facet_limit-active' if facet_field_in_params?(facet_field.field) %>">
  <div class="<%= "collapsed" if should_collapse_facet?(facet_field) %> collapse-toggle panel-heading" data-toggle="collapse" data-target="#<%= facet_field_id(facet_field) %>">
    <h5 class="panel-title">
        <a class="accordion-toggle" data-toggle="collapse"
        >
      <%= link_to facet_field_label(facet_field.field), "#", :"data-no-turbolink" => true %>
        </a>
    </h5>
  </div>
  <div id="<%= facet_field_id(facet_field) %>" class="panel-collapse facet-content <%= should_collapse_facet?(facet_field) ? 'collapse' : 'in' %>">
    <div class="panel-body">
       <%= yield %>
    </div>
   </div>
</div>

我添加到引导 css 的 css：

.panel-heading .accordion-toggle:after {
    /* symbol for "opening" panels */
    font-family: 'Glyphicons Halflings';  /* essential for enabling glyphicon */
    content: "\e114";    /* adjust as needed, taken from bootstrap.css */
    float: right;        /* adjust as needed */
    color: grey;         /* adjust as needed */
}
.panel-heading .accordion-toggle.collapsed:after {
    /* symbol for "collapsed" panels */
    content: "\e080";    /* adjust as needed, taken from bootstrap.css */
}
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