twitter-bootstrap - 在移动设备上单击导航栏面包屑时如何防止标题文本向下移动

问题描述

问题是，在移动设备中，当我单击面包屑时，标题文本和按钮会向下移动到标题图像之外。是否可以保持按钮和文本静态而无需将导航移动到标题之外。如果 nav 在标题之外，则不会发生这种情况。 https://jsfiddle.net/f4cejopu/

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
    <!-- Bootstrap CSS -->
    <link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css" integrity="sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO" crossorigin="anonymous">
    <style type="text/css">
      
.row {
  margin-right: 0px;
  margin-left: 0px;
}
.navbar-custom {
  background: transparent; !important;
    z-index: 9999;
}
header {
  background-image: url("https://i.imgur.com/w8jxzG4.jpg");
  height: 80vh;
  background-size: cover;
  background-position: center;
  background-attachment: fixed;
    position: absolute;
    width: 100%;
    top: 0;
}
.navbar-custom {
  background: transparent !important;
  
}

header h1{
  color: #fff;
}

.header-content{
  padding-top: 14rem;
    padding-bottom: 10rem;
}
    </style>
    <title></title>
  </head>
  <body>
  <header>
<nav class="navbar navbar-custom navbar-expand-sm navbar-dark bg-dark">
  <a class="navbar-brand" href="#">Space</a>
  <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <div class="collapse navbar-collapse" id="navbarSupportedContent">
    <ul class="navbar-nav mr-auto">
      <li class="nav-item">
        <a class="nav-link" href="#">Home</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Explore</a>
      </li>
      <li class="nav-item dropdown">
        <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
          Shop
        </a>
        <div class="dropdown-menu" aria-labelledby="navbarDropdown">
          <a class="dropdown-item" href="#">Action</a>
          <a class="dropdown-item" href="#">Another action</a>
          <div class="dropdown-divider"></div>
          <a class="dropdown-item" href="#">Something else here</a>
        </div>
      </li>
    </ul>
    <ul class="navbar-nav ml-auto"> <!-- margin-right auto -->
      <li>
        <a class="nav-link" href="#">Login</a>
      </li>
       <li>
        <a class="nav-link" href="#">Register</a>
      </li>
    </ul>
  </div>
</nav>
<div class="header-content">
  <div class="row">
   <div class="col-sm-10 mx-auto">
  <h1>Welcome To The Space</h1>
  </div>
  </div>

  <div class="row">
    <div class="col-sm-10 mx-auto">
  <button class="btn">Register for a trip</button>
  </div>
  </div>
</div>
</header>
<br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br><br>

    <!-- Optional JavaScript -->
    <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <script src="https://code.jquery.com/jquery-3.3.1.slim.min.js" integrity="sha384-q8i/X+965DzO0rT7abK41JStQIAqVgRVzpbzo5smXKp4YfRvH+8abtTE1Pi6jizo" crossorigin="anonymous"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.3/umd/popper.min.js" integrity="sha384-ZMP7rVo3mIykV+2+9J3UJ46jBk0WLaUAdn689aCwoqbBJiSnjAK/l8WvCWPIPm49" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.1.3/js/bootstrap.min.js" integrity="sha384-ChfqqxuZUCnJSK3+MXmPNIyE6ZbWh2IMqE241rYiqJxyMiZ6OW/JmZQ5stwEULTy" crossorigin="anonymous"></script>
  </body>
</html>

标签： twitter-bootstrapcssbootstrap-4

防止nav文本下推的最简单解决方法content是通过定位将其从 DOM 流中移除。

.navbar.navbar-custom {
    position: absolute;
    left: 0;
    right: 0;
}

您会注意到您的内容将向上移动（因为navbar不再影响它周围的元素 - 类似于从中删除它<header>）。这里最简单的解决方法就是对内容应用偏移量。就像是：

.header-content {
    margin-top: 3.4375rem // or ~55px
}

或者，利用现有的padding-top，例如：

.header-content {
    padding-top: calc(3.4375rem + 4rem);
}

JSFiddle：https ://jsfiddle.net/wmtsgxe4/

前：

之后（文本位于灰色导航栏后面）：

twitter-bootstrap - 在移动设备上单击导航栏面包屑时如何防止标题文本向下移动

问题描述

解决方案

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