使用 Bootstrap 4 将导航栏文本向右对齐 [重复]

Question

我正在尝试创建一个谷歌克隆，但我无法使用 Bootstrap 4 将 li 放在页面的最右侧，此链接包含我正在尝试编辑的代码，我尝试添加 mr-auto和 justify-content-end 到 ul 但仍然没有任何效果。

Fiddle

Answer 1

如果你只想要最右边的项目，你可以使用

.navbar-nav {
  align-items: flex-end;
}

ul 是用flex-direction: column; 设置的，这意味着你必须使用align-items 来水平定位项目，justify-content 来垂直定位项目。

试试这个 sn-p：

.navbar-nav {
  align-items: flex-end;
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
<!--Navbar-->
<nav class="navbar navbar-expand-lg navbar-light bg-white ">
  <button class="navbar-toggler" 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 navbar-right mr-auto">
      <li class="nav-item">
        <a class="nav-link" href="#">Gmail</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Images</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">
          Circle
        </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>

<!--Bootstrap Scripts;-->
<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/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>

---

如果您希望页面最右侧的所有内容（汉堡图标和项目），您可以这样做：

.navbar-nav {
  align-items: flex-end;
}

nav.navbar {
   justify-content: flex-end;
}

.dropdown.show, .dropdown-menu.show {
  text-align: right;  
}

由于nav.navbar 具有默认的flex-direction: row，justify-content 水平放置内容，align-items 垂直放置nav.navbar 的内容。

我在列表项下拉列表中设置了text-align: right;，以便它在打开时保持向右对齐。

试试下面这个sn-p：

.navbar-nav {
  align-items: flex-end;
}

nav.navbar {
  justify-content: flex-end;
}

.dropdown.show, .dropdown-menu.show {
  text-align: right;  
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
<!--Navbar-->
<nav class="navbar navbar-expand-lg navbar-light bg-white ">
  <button class="navbar-toggler" 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 navbar-right mr-auto">
      <li class="nav-item">
        <a class="nav-link" href="#">Gmail</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Images</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">
          Circle
        </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>


<!--Bootstrap Scripts;-->
<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/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>

更新

此 sn-p 将确保所有内容在所有屏幕宽度上都向右对齐。我从 html 中删除了 mr-auto，因为它干扰了 flexbox 将内容对齐到 flex 容器末尾的能力。

.navbar-nav {
  align-items: flex-end;
}

nav.navbar {
  justify-content: flex-end;
}

.dropdown.show,
.dropdown-menu.show {
  text-align: right;
}

@media (min-width: 992px) {
  .navbar-expand-lg .navbar-collapse {
    justify-content: flex-end;
  }
  .dropdown-menu.show {
    left: -8rem;
  }
}

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css">
<link rel="stylesheet" type="text/css" href="Google.css">

<!--Navbar-->
<nav class="navbar navbar-expand-lg navbar-light bg-white ">
  <button class="navbar-toggler" 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 navbar-right">
      <li class="nav-item">
        <a class="nav-link" href="#">Gmail</a>
      </li>
      <li class="nav-item">
        <a class="nav-link" href="#">Images</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">
          Circle
        </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>

<!--Bootstrap Scripts;-->
<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/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>