如何更改link 展开时徽标折叠？

Question

我用 Bootstrap 创建了一个手风琴 link，我希望在手风琴关闭时有一个徽标 "Plus"，在打开手风琴时有一个徽标 "Less"。这是我的 html 代码：

<div class="panel-group" id="accordion">
  <div class="panel panel-default">
    <div class="panel-heading">
      <a data-toggle="collapse" data-parent="#accordion" href="#collapse1">
        <h4 class="panel-title">
        <i class="fa fa-object-group fa-lg"></i> Ses contenus <span class="badge">12</span>
        <div class="panel-button"><i class="fa fa-minus-circle fa-lg"></i></div>
        </h4>
      </a>
    </div>
    <div id="collapse1" class="panel-collapse collapse">
      <div class="panel-body"><dd>{{ drupal_view('profil_page_contenu_utilisateur', 'block_1') }}</dd></div>
    </div>
  </div>
</div>

这是 css 但它不起作用 :

body.path-profile .field--name-dynamic-block-fieldprofile-profil-page-contenu-utilisateur .panel-button div.collapse > a i:before {
    content: '\f055';
}

body.path-profile .field--name-dynamic-block-fieldprofile-profil-page-contenu-utilisateur .panel-button div.collapse > a[aria-expanded=true] i:before {
    content: '\f056';
}

Answer 1

Bootstrap 使用它自己的 Jquery 制作了 Collapse。

你最好也使用 Jquery。

看到这个问题：

Twitter bootstrap 3.0 icon change on collapse

Answer 2

希望这对您有所帮助...

$(document).ready(function(){
  $("#collapse1").on("hide.bs.collapse", function(){
    $("#icon").html('<span class="glyphicon glyphicon-plus"></span>');
  });
  $("#collapse1").on("show.bs.collapse", function(){
    $("#icon").html('<span class="glyphicon glyphicon-minus"></span>');
  });
});

#icon{
float: right;
}

<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>

<div class="container">
  <h2>Collapsible Panel</h2>
  <p>Click on the collapsible panel to open and close it.</p>
  <div class="panel-group">
    <div class="panel panel-default">
      <div class="panel-heading">
        <h4 class="panel-title">
          <a data-toggle="collapse" href="#collapse1">Collapsible panel<p id="icon"><span class="glyphicon glyphicon-plus"></p></a>
        </h4>
      </div>
      <div id="collapse1" class="panel-collapse collapse">
        <div class="panel-body">Panel Body</div>
        <div class="panel-footer">Panel Footer</div>
      </div>
    </div>
  </div>
</div>
    
</body>
</html>

如何更改link 展开时徽标折叠？

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