html - 导航栏在移动设备上的 Bootstrap 中无法正确显示

Question

我正在尝试构建一个导航栏，如图所示，我还提供了我使用过的代码。

我对 Web 界面上的 View 很满意，但是移动设备上的 View 完全乱七八糟。我提供了这两种设备的屏幕截图。

Logo 甚至不是导航栏的一部分，我在使用右侧菜单时遇到了问题。

标题.php

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap-theme.min.css">
<link rel="stylesheet" href="https://necolas.github.io/normalize.css/3.0.2/normalize.css">
<meta name="viewport" content="width=device-width, initial-scale=1, maximum-scale=1">

<nav class="navbar navbar-default">
<div class="container-fluid">
<!-- Brand and toggle get grouped for better mobile display -->
<div class="navbar-header">
  <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false">
    <span class="sr-only">Toggle navigation</span>
    <span class="icon-bar"></span>
    <span class="icon-bar"></span>
    <span class="icon-bar"></span>
  </button>
  <ul class="nav navbar-nav">

    <li class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false">
        <span class="glyphicon glyphicon-th"></span>
      </a>
      <ul class="dropdown-menu">
        <li><a href="/home">Home</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="/admin">Admin</a></li>
        <li><a href="/holidays">Holidays</a></li>
        <li><a href="/leave">Leave</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="/billing">Billing</a></li>
        <li><a href="/reports">Reports</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="/login/logout">Logout</a></li>
      </ul>
    </li>
  </ul>
</div>

<a class="brand" style="margin: 0; float: none;" href="/home"><img src="http://www.chutti.work/assets/images/logo-final.png" width="130"/></a>


<!-- Collect the nav links, forms, and other content for toggling -->
<div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
  <ul class="nav navbar-nav navbar-right">
    <li>
        <a href="/user/profile/">
            User Profile
            <?php //echo $this->session->userdata['user_fname']." ".$this->session->userdata['user_lname']; ?>
        </a>
    </li>
    <li class="dropdown">
      <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><span class="glyphicon glyphicon-bell"></span></a>
      <ul class="dropdown-menu">
        <li><p class="text-muted" align="center">Notifications</p></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">Action</a></li>
        <li><a href="#">Action</a></li>
        <li><a href="#">Another action</a></li>
        <li><a href="#">Something else here</a></li>
        <li role="separator" class="divider"></li>
        <li><a href="#">Separated link</a></li>
      </ul>
    </li>
  </ul>
</div><!-- /.navbar-collapse -->

Answer 1

实现此目的的一种方法是将左侧导航下拉菜单放置在导航栏标题内，使其始终保持暴露状态，然后定位它。您还可以将导航栏 Logo 放在中心，而不必将其放在链接内。

查看工作示例代码段。

.navbar.navbar-custom {
  background: white;
}
.navbar-custom .navbar-brand.navbar-brand-centered img {
  position: absolute;
  left: 50%;
  display: block;
  width: 130px;
  text-align: center;
  top: 0;
}
.navbar.navbar-custom > .container .navbar-brand.navbar-brand-centered img,
.navbar.navbar-custom > .container-fluid .navbar-brand.navbar-brand-centered img {
  margin-left: -65px;
}
.navbar.navbar-custom .navbar-upper {
  position: absolute;
  left: 0px;
}
@media (max-width: 767px) {
  .navbar.navbar-custom .navbar-upper {
    top: -3px;
    left: 15px;
    background: none;
  }
  .navbar.navbar-custom .navbar-upper .dropdown-menu {
    background: white;
    margin-top: 6px;
    -webkit-background-clip: padding-box;
    background-clip: padding-box;
    border: 1px solid #ccc;
    border: 1px solid rgba(0, 0, 0, .15);
    border-top: none;
    border-radius: 0;
    -webkit-box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
    box-shadow: 0 6px 12px rgba(0, 0, 0, .175);
  }
  .navbar.navbar-custom .navbar-upper .nav li.dropdown.open > .dropdown-toggle,
  .navbar.navbar-custom .navbar-upper .nav li.dropdown.active > .dropdown-toggle,
  .navbar.navbar-custom .navbar-upper .nav li.dropdown.open.active > .dropdown-toggle {
    background: none;
  }
}

<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/js/bootstrap.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.5/css/bootstrap.min.css" rel="stylesheet" />
<nav class="navbar navbar-default navbar-static-top navbar-custom">
  <div class="container-fluid">
    <!-- Brand and toggle get grouped for better mobile display -->
    <div class="navbar-header">
      <button type="button" class="navbar-toggle collapsed" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1" aria-expanded="false"> <span class="sr-only">Toggle navigation</span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>

      </button>
      <a class="navbar-brand navbar-brand-centered" href="/home">
        <img src="http://www.chutti.work/assets/images/logo-final.png" />
      </a>

      <div class="navbar-upper">
        <ul class="nav navbar-nav navbar-left">
          <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> <span class="glyphicon glyphicon-th"></span> 
            </a>

            <ul class="dropdown-menu">
              <li><a href="/home">Home</a>

              </li>
              <li role="separator" class="divider"></li>
              <li><a href="/admin">Admin</a>

              </li>
              <li><a href="/holidays">Holidays</a>

              </li>
              <li><a href="/leave">Leave</a>

              </li>
              <li role="separator" class="divider"></li>
              <li><a href="/billing">Billing</a>

              </li>
              <li><a href="/reports">Reports</a>

              </li>
              <li role="separator" class="divider"></li>
              <li><a href="/login/logout">Logout</a>

              </li>
            </ul>
          </li>
        </ul>
      </div>
    </div>
    <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
      <ul class="nav navbar-nav navbar-right">
        <li> <a href="/user/profile/">Profile</a>

        </li>
        <li class="dropdown"> <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"><span class="glyphicon glyphicon-bell"></span></a>

          <ul class="dropdown-menu">
            <li>
              <p class="text-muted" align="center">Notifications</p>
            </li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Action</a>

            </li>
            <li><a href="#">Action</a>

            </li>
            <li><a href="#">Another action</a>

            </li>
            <li><a href="#">Something else here</a>

            </li>
            <li role="separator" class="divider"></li>
            <li><a href="#">Separated link</a>

            </li>
          </ul>
        </li>
      </ul>
    </div>
  </div>
</nav>
<div class="container">
  <div class="well">Welllll</div>
</div>