Question

我刚刚切换到bootstrap 4并重新编写我的所有html和scss来处理它，我似乎无法找到如何在导航栏的右侧放置一组导航项。这是我的导航栏代码：

<nav class="navbar navbar-full navbar-dark bg-primary">
        <button class="navbar-toggler hidden-md-up" type="button" data-toggle="collapse" data-target="#navbarResponsive" aria-controls="navbarResponsive" aria-expanded="false" aria-label="Toggle navigation"></button>
        <%= link_to "Living Recipe", recipes_path(sort_attribut: "popularity", sort_order: :desc), class: "navbar-brand" %>
        <div class="collapse navbar-toggleable-sm" id="navbarResponsive">   
            <ul class="nav navbar-nav float-md-left">
                <li class="nav-item">
                    <%= form_tag(recipes_path, :method => "get", id: "search-form", class: "form-inline") do %>
                            <%= text_field_tag :search, params[:search], placeholder: "Search Recipes", class: "form-control col-md-8" %>
                    <% end %>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" href="http://example.com" id="responsiveNavbarDropdown" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Browse</a>
                    <div class="dropdown-menu" aria-labelledby="responsiveNavbarDropdown">
                        <%= link_to "Popular", recipes_path(sort_attribute: "popularity", sort_order: :desc), class: "dropdown-item" %>
                        <%= link_to "Newest", recipes_path(sort_attribute: "created_at", sort_order: :desc), class: "dropdown-item" %>
                        <%= link_to "Most Updated", recipes_path(sort_attribute: "most_active", sort_order: :desc), class: "dropdown-item" %>
                        <%= link_to "Most Saved", recipes_path(sort_attribute: "save_count", sort_order: :desc), class: "dropdown-item" %>
                    </div>
                </li>
            </ul>
            <ul class="nav navbar-nav float-md-right">
                <% if user_signed_in? %>
                    <li class="dropdown">
                        <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                            <%= current_user.displayname.present? ? "D-ring" : current_user.firstname %>
                        </a>
                        <div class="dropdown-menu" aria-labelledby="responsiveNavbarDropdown">
                            <%= link_to "Profile", user_path(current_user.id), class: "dropdown-item" %>
                            <%= link_to "Recipe Box", user_saved_recipes_path(current_user.id), class: "dropdown-item" %>
                            <%= link_to "Add Recipe", new_recipe_path, class: "dropdown-item" %>
                            <%= link_to "Submitted Recipes", user_path(current_user.id), class: "dropdown-item" %>
                            <%= link_to "Sign Out", destroy_user_session_path, :method => :delete, class: "dropdown-item" %>
                        </div>
                    </li>
                <% else %>
                    <li class="nav-item">
                        <%= link_to "Create Account", '', data: {:'toggle' => 'modal', :'target' => '#signupModal'}, class: "nav-link" %>
                    </li>
                    <li class="nav-item">
                        <%= link_to "Login", '', data: {:'toggle' => 'modal', :'target' => '#loginModal'}, class: "nav-link" %>
                    </li>           
                <% end %>
            </ul>
        </div>
    </nav>

这是它的样子截图

Answer 1

TL; DR：

为右侧所需的导航栏项创建另一个<ul class="navbar-nav ml-auto"> ml-auto会将navbar-nav拉向右侧mr-auto将其拉到左侧。

针对Bootstrap v4.1.3

进行了测试

＆＃13;

<!DOCTYPE html>
<html lang="en">
<head>
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"/>
  <style>
    /* Stackoverflow preview fix, please ignore */
    .navbar-nav {
      flex-direction: row;
    }
    
    .nav-link {
      padding-right: .5rem !important;
      padding-left: .5rem !important;
    }
    
    /* Fixes dropdown menus placed on the right side */
    .ml-auto .dropdown-menu {
      left: auto !important;
      right: 0px;
    }
  </style>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary rounded">
  <a class="navbar-brand" href="#">Navbar</a>
  <ul class="navbar-nav mr-auto">
    <li class="nav-item active">
      <a class="nav-link">Left Link 1</a>
    </li>
    <li class="nav-item">
      <a class="nav-link">Left Link 2</a>
    </li>
  </ul>
  <ul class="navbar-nav ml-auto">
    <li class="nav-item">
      <a class="nav-link">Right Link 1</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">            Dropdown on Right</a>
      <div class="dropdown-menu" aria-labelledby="navbarDropdown">
        <a class="dropdown-item" href="#">Action</a>
        <a class="dropdown-item" href="#">Another action with a lot of text inside of an item</a>
      </div>
    </li>
  </ul>
</nav>
<script src="https://code.jquery.com/jquery-3.2.1.slim.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.9/umd/popper.min.js"></script>
</body>
</html>

＆＃13;

正如您所看到的，添加了其他样式规则以解决Stackoverflows预览框中的一些奇怪问题您应该能够安全地忽略项目中的这些规则。

从v4.0.0开始，这似乎是正式的做法。

编辑我按照@Bruno的建议修改了Post以包含放置在导航栏右侧的下拉列表。它需要将left和right属性反转。我在示例代码的开头添加了一个额外的css片段请注意，当您单击Run code snippet按钮时，该示例显示了移动版本。要查看桌面版本，您必须单击Expand snippet按钮。

.ml-auto .dropdown-menu {
    left: auto !important;
    right: 0px;
}

将这个包含在样式表中应该可以解决问题。

Answer 2

在版本4中，它更容易。只需将ml-auto类放在ul中就像这样：

<ul class="nav navbar-nav ml-auto">

Answer 3

这适用于alpha 6.关键是班级＆＃34; mr-auto＆＃34;在左侧导航，这将右侧导航向右推。您还需要添加navbar-toggleable-md，否则它将堆叠在一列而不是一行中。注意我没有添加剩余的切换项（例如切换按钮），我添加了足够的内容以使其按要求格式化。以下是更完整的示例https://v4-alpha.getbootstrap.com/examples/navbars/。

RewriteEngine On
RewriteCond %{HTTP_HOST} ^(www.example.com)$
RewriteCond "%{QUERY_STRING}" "\/food"
RewriteRule "(food)\/([a-z]+)$" "$12\.php\?type=$2"

Answer 4

我有一个带有左对齐和右对齐导航链接的工作码本，它们都会使用父标记上的.justify-content-between一起折叠到响应式菜单中：https://codepen.io/epan/pen/bREVVW?editors=1000

<nav class="navbar navbar-toggleable-sm navbar-inverse bg-inverse">
  <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbar"     aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
    <span class="navbar-toggler-icon"></span>
  </button>
  <a class="navbar-brand" href="#">Acme</a>
  <div class="collapse navbar-collapse justify-content-between" id="navbar">
    <div class="navbar-nav">
      <a class="nav-item nav-link" href="#">Ball Bearings</a>
      <a class="nav-item nav-link" href="#">TNT Boxes</a>
    </div>
    <div class="navbar-nav">
      <a class="nav-item nav-link" href="#">Logout</a>
    </div>
  </div>
</nav>

Answer 5

在Bootstrap 4 alpha-6版本中，由于导航栏使用的是flex模型，您可以在父级div中使用justify-content-end并删除mr-auto。

<div class="collapse navbar-collapse justify-content-end" id="navbarText">
  <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="#">Link</a>
    </li>
    <li class="nav-item">
      <a class="nav-link disabled" href="#">Disabled</a>
    </li>
  </ul>
</div>

这就像一个魅力：）

Answer 6

使用Bootstrap v4.0.0-alpha.6：两个<ul> s（.navbar-na），一个.mr-auto和一个.ml-auto：

<nav ...> 
  ...     
  <div class="collapse navbar-collapse">
    <ul class="navbar-nav mr-auto">
      <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="#">Left Link </a>
      </li>
    </ul>
    <ul class="navbar-nav ml-auto">
      <li class="nav-item">
        <a class="nav-link" href="#">Right Link </a>
      </li>
    </ul>
  </div>
</nav>

Answer 7

就我而言，我一直在寻找一种解决方案，允许一个导航栏项目正确对齐。为此，您必须将style="width:100%;"添加到<ul class="navbar-nav">，然后将ml-auto类添加到导航栏项目。

Answer 8

这里和简单的例子。

<!-- Navigation bar-->

<nav class="navbar navbar-toggleable-md bg-info navbar-inverse">
    <div class="container">
        <button class="navbar-toggler" data-toggle="collapse" data-target="#mainMenu">
            <span class="navbar-toggler-icon"></span>
            </button>
        <div class="collapse navbar-collapse" id="mainMenu">
            <div class="navbar-nav ml-auto " style="width:100%">
                <a class="nav-item nav-link active" href="#">Home</a>
                <a class="nav-item nav-link" href="#">About</a>
                <a class="nav-item nav-link" href="#">Training</a>
                <a class="nav-item nav-link" href="#">Contact</a>
            </div>
        </div>
    </div>
</nav>

右侧的Bootstrap 4导航栏项目

8 个答案:

针对Bootstrap v4.1.3