Question

当面板合拢/打开时，我想使用不同的背景色。因此，我尝试在.collapse类中更改background-color，但是它更改了不同背景的背景色。请提供有关打开时如何更改背景颜色的帮助。谢谢

.collapse{
        background-color: yellow;
    }

<div class="container-fluid">
  <div class="row">
    <div class="col-md-2">

      <div id="MainMenu">
        <div class="list-group panel">
          <a href="#demo3" class="list-group-item list-group-item-success" data-toggle="collapse" data-parent="#MainMenu">Item 3</a>
          <div class="collapse" id="demo3">
            <a href="#SubMenu1" class="list-group-item" data-toggle="collapse" data-parent="#SubMenu1">Subitem 1 <i class="fa fa-caret-down"></i></a>
            <div class="collapse list-group-submenu" id="SubMenu1">
              <a href="#" class="list-group-item" data-parent="#SubMenu1">Subitem 1 a</a>
              <a href="#" class="list-group-item" data-parent="#SubMenu1">Subitem 2 b</a>
              <a href="#SubSubMenu1" class="list-group-item" data-toggle="collapse" data-parent="#SubSubMenu1">Subitem 3 c <i class="fa fa-caret-down"></i></a>
              <div class="collapse list-group-submenu list-group-submenu-1" id="SubSubMenu1">
                <a href="#" class="list-group-item" data-parent="#SubSubMenu1">Sub sub item 1</a>
                <a href="#" class="list-group-item" data-parent="#SubSubMenu1">Sub sub item 2</a>
              </div>
              <a href="#" class="list-group-item" data-parent="#SubMenu1">Subitem 4 d</a>
            </div>
            <a href="javascript:;" class="list-group-item">Subitem 2</a>
            <a href="javascript:;" class="list-group-item">Subitem 3</a>
          </div>
          <a href="#demo4" class="list-group-item list-group-item" data-toggle="collapse" data-parent="#MainMenu">Item 4</a>
          <div class="collapse" id="demo4">
            <a href="" class="list-group-item">Subitem 1</a>
            <a href="" class="list-group-item">Subitem 2</a>
            <a href="" class="list-group-item">Subitem 3</a>
          </div>
           <a href="#demo5" class="list-group-item list-group-item" data-toggle="collapse" data-parent="#MainMenu">Item 5</a>
            <div class="collapse" id="demo5">
            <a href="#" class="list-group-item">Subitem 1</a>
            <a href="" class="list-group-item">Subitem 2</a>
            <a href="" class="list-group-item">Subitem 3</a>
          </div>
        </div>
      </div>

    </div>  
  </div>  
</div>

Answer 1

您应该在折叠DOM打开时寻找要添加的类，并应嵌套这些类以添加该属性。假设您要更改颜色 <div class="collapse">，并在您的浏览器中检查何时打开折叠划分法，并向其添加了哪个类。假设除法变为<div class="collapse active">。那么您应该为共轭类添加属性，例如

.collapse .active{
 background-color:yellow;
}

应该可以解决问题。

面板打开时更改背景颜色

1 个答案: