Bootstrap 4 Navbar位置

时间：2018-02-08 12:30:52

标签： html5 css3 position bootstrap-4 navbar

我正在尝试制作一个悬停在其他两个项目之上的导航栏，然后当它转到移动设备尺寸时，我希望它能够折叠，但是将移动图标放在屏幕的右上角，如下所示：

want

我不知道如何让它悬停在其他两个项目之上，我试图摆弄z-index和偏移，但我无法让它坐在两个中心位置侧面没有白色空间。

JsFiddle

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#mu-carousel .carousel-item {
  max-height: 480px;
}

#mu-header {
  background: lightgrey;
  height: 135px;
}
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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>

<body>
  <header id="mu-header">
    <div class="container">
      <div class="row">
        <div class="col-md-6">
          <span>LOGO/NAME</span>
        </div>
        <div class="col-md-2">
          <span>TEXT</span>
        </div>
        <div class="col-md-2">
          <span>TEXT</span>
        </div>
        <div class="col-md-2">
          <span>TEXT</span>
        </div>
      </div>
    </div>
  </header>

  <div class="container">
    <div class="row">
      <div class="col-md-12">
        <nav class="navbar navbar-expand-md navbar-light bg-faded">
          <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
                        <span class="navbar-toggler-icon"></span>
                    </button>
          <div class="collapse navbar-collapse" id="navbarNavDropdown">
            <ul class="navbar-nav">
              <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
              </li>
              <li class="nav-item">
                <a class="nav-link" href="#">Features</a>
              </li>
              <li class="nav-item">
                <a class="nav-link" href="#">Pricing</a>
              </li>
              <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                                    Dropdown link
                                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                  <a class="dropdown-item" href="#">Action</a>
                  <a class="dropdown-item" href="#">Another action</a>
                  <a class="dropdown-item" href="#">Something else here</a>
                </div>
              </li>
            </ul>
          </div>
        </nav>
      </div>
    </div>
  </div>

  <section id="mu-carousel">
    <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
      <div class="carousel-inner" role="listbox">
        <div class="carousel-item active">
          <img class="d-block img-fluid" src="https://static.pexels.com/photos/93140/pexels-photo-93140.jpeg" alt="First slide">
        </div>
        <div class="carousel-item">
          <img class="d-block img-fluid" src="https://static.pexels.com/photos/93140/pexels-photo-93140.jpeg" alt="Second slide">
        </div>
        <div class="carousel-item">
          <img class="d-block img-fluid" src="https://static.pexels.com/photos/93140/pexels-photo-93140.jpeg" alt="Third slide">
        </div>
      </div>
      <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
        <span class="carousel-control-prev-icon" aria-hidden="true"></span>
        <span class="sr-only">Previous</span>
      </a>
      <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
        <span class="carousel-control-next-icon" aria-hidden="true"></span>
        <span class="sr-only">Next</span>
      </a>
    </div>
  </section>

  <!--  JavaScript -->
  <script src="vendor/jquery/jquery.min.js"></script>
  <script src="vendor/bootstrap/js/bootstrap.bundle.js"></script>

  <!-- Custom scripts for this template -->
  <script src="js/creative.js"></script>

</body>
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1 个答案:

答案 0 :(得分：1)

在这种情况下，您只需将style="margin-top: -28px;"添加到导航栏容器（28px是导航栏高度的一半），然后将style="margin-top: -28px;"添加到轮播容器中。

最后，将sticky-top添加到导航栏容器中。

为了使其适用于小屏幕，如图所示，必须将导航栏切换器从导航栏中取出。我将它放在HTML中徽标列之后的列中。 （我还给了切换背景颜色以使其可见。）

类d-flex justify-content-end使切换器右对齐，类d-md-none确保切换器在较大的屏幕上消失。

由于小屏幕上的导航栏只有16px高（因为切换器被取出），我们需要一个自定义类来控制小屏幕和大屏幕的负上边距：

.mpush {
    margin-top: -8px;
}
@media (min-width: 768px) {
    .mpush {
        margin-top: -28px;
    }
}

这是完整的工作片段：

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<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
    
<style>
.mpush {
    margin-top: -8px;
}
@media (min-width: 768px) {
    .mpush {
        margin-top: -28px;
    }
}
</style>

<header id="mu-header" style="height: 135px; background: lightgrey;">
    <div class="container">
        <div class="row">
            <div class="col-8 col-md-6">
                <span>LOGO/NAME</span>
            </div>

            <div class="col-4 d-flex d-md-none justify-content-end">
                <button class="navbar-toggler navbar-toggler-right2 bg-warning" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
                    <span class="navbar-toggler-icon"></span>
                </button>
            </div>

            <div class="col-md-2">
                <span>TEXT</span>
            </div>
            <div class="col-md-2">
                <span>TEXT</span>
            </div>
            <div class="col-md-2">
                <span>TEXT</span>
            </div>
        </div>
    </div>
</header>

<div class="container bg-warning sticky-top mpush">
    <div class="row">
        <div class="col-md-12">
            <nav class="navbar navbar-expand-md navbar-light bg-faded">

                <div class="collapse navbar-collapse" id="navbarNavDropdown">
                    <ul class="navbar-nav">
                        <li class="nav-item active">
                            <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Features</a>
                        </li>
                        <li class="nav-item">
                            <a class="nav-link" href="#">Pricing</a>
                        </li>
                        <li class="nav-item dropdown">
                            <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                                Dropdown link
                            </a>
                            <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                                <a class="dropdown-item" href="#">Action</a>
                                <a class="dropdown-item" href="#">Another action</a>
                                <a class="dropdown-item" href="#">Something else here</a>
                            </div>
                        </li>
                    </ul>
                </div>
            </nav>
        </div>
    </div>
</div>

<section id="mu-carousel" class="mpush">
    <div id="carouselExampleIndicators" class="carousel slide" data-ride="carousel">
        <div class="carousel-inner" role="listbox">
            <div class="carousel-item active">
                <img class="d-block img-fluid" src="https://static.pexels.com/photos/93140/pexels-photo-93140.jpeg" alt="First slide">
            </div>
            <div class="carousel-item">
                <img class="d-block img-fluid" src="https://static.pexels.com/photos/93140/pexels-photo-93140.jpeg" alt="Second slide">
            </div>
            <div class="carousel-item">
                <img class="d-block img-fluid" src="https://static.pexels.com/photos/93140/pexels-photo-93140.jpeg" alt="Third slide">
            </div>
        </div>
        <a class="carousel-control-prev" href="#carouselExampleIndicators" role="button" data-slide="prev">
            <span class="carousel-control-prev-icon" aria-hidden="true"></span>
            <span class="sr-only">Previous</span>
        </a>
        <a class="carousel-control-next" href="#carouselExampleIndicators" role="button" data-slide="next">
            <span class="carousel-control-next-icon" aria-hidden="true"></span>
            <span class="sr-only">Next</span>
        </a>
    </div>
</section>

<p style="padding-top: 999px;">Lorem ipsum dolor sit amet, consectetur adipisicing elit. Cupiditate deleniti facilis corrupti dolores vero eaque, placeat saepe velit a officiis inventore itaque ipsa, temporibus. Est sint voluptatem natus veritatis in.</p>
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