搜索框引导程序4无法定位在导航栏中的中间位置

Question

我试图将搜索栏放置在导航栏的中间。左侧有徽标，右侧有菜单。我在哪里出错，该如何解决。

<nav class="navbar navbar-expand-lg navbar-light bg-light mb-4">
    <div class="container-fluid">
      <a class="navbar-brand" href="{% url 'home' %}">ATG</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 justify-content-end" id="navbarSupportedContent">
        <ul class="navbar-nav">
          <li class="nav-item active">
            <a class="nav-link" href="{% url 'home' %}">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 dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
              More
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdown">
              {% if not user.is_authenticated %}
              <a class="dropdown-item" href="{% url 'signup' %}">Sign up</a>
              <a class="dropdown-item" href="{% url 'login' %}">Log in</a>
              {% else %}
                <a class="dropdown-item" href="{% url 'secret' %}">Profile</a>
                <a class="dropdown-item" href="{% url 'password_change' %}">Change password</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="{% url 'logout' %}">Log out</a>
              {% endif %}
            </div>
          </li>
        </ul>
        <form class="navbar-form" id="search" role="search">
                               <div class="form-group">
                                   <input type="text" class="form-control" placeholder="Search">
                               </div>
                               <!-- <button type="submit" class="btn btn-default">Submit</button> -->
                           </form>
        <style>
        #search{
            text-align:center;
        }
        </style>
      </div>
    </div>
  </nav>

这里是fiddle的链接

Answer 1

希望这对您有帮助。

<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.14.7/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.3.1/js/bootstrap.min.js"></script>


<nav class="navbar navbar-expand-lg navbar-light bg-light mb-4">
    <div class="container-fluid">
      <a class="navbar-brand" href="{% url 'home' %}">ATG</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 justify-content-end" id="navbarSupportedContent">
          
        <ul class="navbar-nav order-lg-2">
          <li class="nav-item active">
            <a class="nav-link" href="{% url 'home' %}">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 dropdown">
            <a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
              More
            </a>
            <div class="dropdown-menu" aria-labelledby="navbarDropdown">
              {% if not user.is_authenticated %}
              <a class="dropdown-item" href="{% url 'signup' %}">Sign up</a>
              <a class="dropdown-item" href="{% url 'login' %}">Log in</a>
              {% else %}
                <a class="dropdown-item" href="{% url 'secret' %}">Profile</a>
                <a class="dropdown-item" href="{% url 'password_change' %}">Change password</a>
                <div class="dropdown-divider"></div>
                <a class="dropdown-item" href="{% url 'logout' %}">Log out</a>
              {% endif %}
            </div>
          </li>
        </ul>
      <form class="navbar-form mx-lg-auto order-lg-1 mb-0" id="search" role="search">
                               <div class="form-group mb-0">
                                   <input type="text" class="form-control" placeholder="Search">
                               </div>
                               <!-- <button type="submit" class="btn btn-default">Submit</button> -->
                           </form>
   
      </div>
    </div>
  </nav>