如何更改click事件上的bootstrap插入符指向方向

Question

我正在使用2.3.2 bootstrap

当我单击菜单按钮时,我可以更改插入符号图标的位置.

当我点击指向上方的图标插入符号时,我需要它,当你点击另一个项目时,插入符号回到初始状态.

这怎么可能？

导航代码

<div id="navi">
    <div class="container">
      <nav>
        <div class="navbar">
          <div class="navbar-inner">
            <div class="row">
              <button type="button" class="btn btn-navbar" data-toggle="collapse" data-target=".nav-collapse">
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
              </button>

              <div class="span2">
                <a class="brand" href="#"></a>
              </div>

              <div class="span10">
                <div class="nav-collapse collapse">
                  <div class="row">
                    <div class="span8">
                      <ul class="nav">
                        <li class="dropdown">
                          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Lorem 3 opes<b class="caret"></b></i></a>
                          <ul class="dropdown-menu">
                            <li><a href="#">Lorem</a></li>
                            <li><a href="institucional.html">Olosmpa</a></li>
                            <li><a href="#">Lorem 2 isum</a></li>

                          </ul>
                        </li>

                        <li class="dropdown">
                          <a href="#" class="dropdown-toggle" data-toggle="dropdown">Lorem mas<b class="caret"></b></a>
                          <ul class="dropdown-menu">
                            <li><a href="#">Lorem</a></li>
                            <li><a href="institucional.html">Olosmpa</a></li>
                            <li><a href="#">Lorem 2 isum</a></li>

                          </ul>
                        </li>



                      </ul> 
                    </div><!-- /span8 -->

                    <div class="span2">
                      <div>
                        <form id="buscar-fixed" class="navbar-form form-search">
                          <div class="input-append">
                            <input class="inputBusqueda span2" type="text" placeholder="Buscar..." />
                            <button class="btn" type="button"><i class="icon-search icon-white"></i></button>


                          </div>
                        </form>

                      </div>
                    </div><!-- /span2 -->
                  </div><!-- /row -->
                </div><!--/.nav-collapse -->
              </div><!-- /span10 -->
            </div><!-- /row -->
          </div><!-- /nav-inner -->
        </div><!-- /navbar -->
      </nav>
    </div><!-- /container -->
  </div><!-- fin #nav-sup -->

链接到小提琴尝试解决

问题的图像示例

Answer 1

你可以添加这个

.nav .dropdown.open .caret{
    border-top: none;
    border-bottom: 4px solid #000000;
}

更新小提琴

Answer 2

只需添加这个CSS：

   .navbar-default .navbar-nav>li>a:focus .caret{
        transform:rotate(-90deg);
        transition:all 0.3s ease-in-out; /*for smoothness*/
    }