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Bootstrap 4嵌套下拉菜单？

bootstrap-4
5
我想要实现的是，如果有人点击“艺术”菜单项，则“历史学”、“社会学”和“地理学”子菜单应该出现。但是当有人点击“艺术”时，它们并没有出现。
https://jsfiddle.net/0e7jdfza/ 我尝试将这段代码 https://jsfiddle.net/w3zyLmgb/ 添加到“艺术”li和ul的位置，但它不能在下拉菜单中工作，尽管它在下拉菜单外部可以正常工作。
<!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://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

                <title>Hello, world!</title>
              </head>
              <body>        
    <div class="dropdown show">
                  <a class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Select Streams
                  </a>
                  <ul class="dropdown-menu" aria-labelledby="dropdownMenuLink">
                    <li><a class="dropdown-item" href="#">Science</a></li>
                    <li><a class="dropdown-item" href="#">Commerce</a></li>
                    <li class="nav-item dropdown"><a class="dropdown-item" href="#">Arts</a>
                      <ul>
                        <li>History</li>
                        <li>Sociology</li>
                        <li>Geogrphy</li>
                      </ul>
                    </li>
                </ul>
                 </div>


            <!-- Optional JavaScript -->
            <!-- jQuery first, then Popper.js, then Bootstrap JS -->
            <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>
        </html>
这不是答案，只是另一种解决方案 https://www.tutlane.com/example/bootstrap/bootstrap-dropdown-menu-with-dividers-example - Aditya Rajgor
4个回答
10
我认为这个有点类似于你所寻找的内容。
根据其中一个建议更新你的代码，就会像给出的示例一样。
（如果你使用Angular，你可以使用ngx-dropdowns，他们有一个嵌套下拉菜单的解决方案） 

$('.dropdown-menu a.dropdown-toggle').on('click', function(e) {
  if (!$(this).next().hasClass('show')) {
    $(this).parents('.dropdown-menu').first().find('.show').removeClass("show");
  }
  var $subMenu = $(this).next(".dropdown-menu");
  $subMenu.toggleClass('show');


  $(this).parents('li.nav-item.dropdown.show').on('hidden.bs.dropdown', function(e) {
    $('.dropdown-submenu .show').removeClass("show");
  });


  return false;
});
.dropdown-submenu {
  position: relative;
}

.dropdown-submenu a::after {
  transform: rotate(-90deg);
  position: absolute;
  right: 6px;
  top: .8em;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-left: .1rem;
  margin-right: .1rem;
}
<!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://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">

  <title>Hello, world!</title>
</head>

<body>
  <div class="dropdown show">
    <a class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Select Streams
                  </a>
    <ul class="dropdown-menu" aria-labelledby="dropdownMenuLink">
      <li><a class="dropdown-item" href="#">Science</a></li>
      <li><a class="dropdown-item" href="#">Commerce</a></li>
      <li class="dropdown-submenu"><a class="dropdown-item dropdown-toggle" href="#">Arts</a>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">History</a></li>
          <li><a class="dropdown-item" href="#">Geography</a></li>
          <li><a class="dropdown-item" href="#">Sociology</a></li>

        </ul>
      </li>
    </ul>
  </div>


  <!-- Optional JavaScript -->
  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <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>

</html>

将CSS代码中的left:100%修改为right:100%，以向左移动。 - Aseem
0

我对其他答案有一些问题：

  • 在移动设备上，将子菜单显示在左侧效果不佳。此外，由于菜单位置是通过 popper.js 动态计算的，您需要对子菜单的位置进行相同的计算。在移动设备上表现良好是 Bootstrap 的重要特点之一，因此不要放弃这一点。
  • 需要额外的 JavaScript 或 CSS 代码，而这正是 Bootstrap 要避免的。这样做必然会导致其他问题和后续维护。

因此，我的建议是不要使用桌面或笔记本电脑中所知道的“子菜单”，而是使用其他方法在不离开 Bootstrap 范例的情况下实现相同的效果：

  • 点击“艺术”菜单项时显示模态框
  • 使用手风琴实现“子菜单”，如下面的示例所示，使用 Bootstrap 5
  • 发挥创意！

<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/js/bootstrap.bundle.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.2.3/dist/css/bootstrap.min.css" rel="stylesheet"/>
<div class="dropdown show title">
  <a class="btn btn-secondary dropdown-toggle" href="#" role="button" id="dropdownMenuLink" data-bs-toggle="dropdown" data-bs-auto-close="outside" aria-haspopup="true" aria-expanded="false">
    Select Streams
  </a>
  <ul class="dropdown-menu accordion" aria-labelledby="dropdownMenuLink" id="accordionParent">
    <li><a class="dropdown-item" href="#">Science</a></li>
    <li><a class="dropdown-item" href="#">Commerce</a></li>
    <li role="presentation">
      <h4 class="accordion-header">
        <button class="accordion-button collapsed" data-bs-toggle="collapse" data-bs-target="[data-binding-id=artsItem]" aria-expanded="false">
          Arts
        </button>
      </h4>
    </li>
    <li class="collapse" data-bs-parent="#accordionParent" data-binding-id="artsItem" role="presentation">
      <a href="#" class="dropdown-item" role="menuitem">
        History
      </a>
    </li>
    <li class="collapse" data-bs-parent="#accordionParent" data-binding-id="artsItem" role="presentation">
      <a href="#" class="dropdown-item" role="menuitem">
        Sociology
      </a>
    </li>
    <li class="collapse" data-bs-parent="#accordionParent" data-binding-id="artsItem" role="presentation">
      <a href="#" class="dropdown-item" role="menuitem">
        Geography
      </a>
    </li>
  </ul>
</div>

0
在下面的代码中，我使用Django模板for循环来循环遍历多个下拉数据。此代码生成2级下拉菜单，第二级下拉在左侧：
<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
    </a>
    <ul class="dropdown-menu " aria-labelledby="navbarDropdown">
        {% for campus in object_list %}
            <li class="dropdown-submenu dropleft">
                <a class="dropdown-item dropdown-toggle " href="#">{{ campus.name }}</a>
                <ul class="dropdown-menu ">
                    {% for school in campus.school.all %}
                        <li><a class="dropdown-item"
                               href="">{{ school.name }}</a>
                        </li>
                    {% endfor %}
                </ul>
            </li>
        {% endfor %}
    </ul>
</li>
-2

$(document).ready(function () {
    $("#type").change(function () {
        var val = $(this).val();
        if (val == "arts") {
            $("#type").html("<option value='history'>history</option><option value='sociology'>sociology</option><option value='geography'>geography</option>");
        } else if (val == "science") {
            $("#type").html("<option value='maths'>maths</option><option value='physics'>physics</option>");
        }
    });
});
<script src="https://ajax.googleapis.com/ajax/libs/jquery/1.11.1/jquery.min.js"></script>
<select id="type" class="dropdown-menu" aria-labelledby="dropdownMenuLink">
    <option value="na">--Select an Item--</option>
    <option value="arts">Arts</option>
    <option value="science">Science</option>
</select>

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