Bootstrap 简明教程

Bootstrap - Dropdowns

本章将讨论 Bootstrap 下拉菜单。下拉菜单是可切换的上下文菜单，可以启用在列表格式中显示链接。这可以通过使用 dropdown JavaScript plugin 来实现交互。

This chapter will discuss about Bootstrap dropdown menus. Dropdown menus are toggleable, contextual menus that can be enabled to show links in a list format. This can be made interactive by using dropdown JavaScript plugin.

在查看下拉菜单示例和功能之前，需要关注几点。

Few points worth noting before checking examples and features of dropdowns.

Dropdowns are constructed using Popper, a third-party library. Popper offers dynamic placement and viewport detection.
Include popper.min.js before Bootstrap’s JavaScript or use bootstrap.bundle.min.js or bootstrap.bundle.js, which contains Popper.
As dynamic positioning is not necessary, Popper is not used to placing dropdowns in navbars.

Basic dropdown

下拉菜单的切换按钮（button 或链接）和下拉菜单需要包装在 .dropdown 内，或申明 position: relative; 的其他元素。我们可以使用 <button> 元素作为下拉菜单触发器，但此插件同样适用于 <a> 元素。以下示例在适当的时候使用 <ul> 元素，但支持自定义标记。

The dropdown’s toggle (button or link) and the dropdown menu needs to be wrapped within .dropdown, or another element that declares position: relative;. We can use a <button> element as the dropdown trigger, but the plugin will work with <a> elements as well. The following examples use <ul> elements where appropriate, but custom markup is supported.

Dropdown Button

可以对 .btn 类进行一些标记更改，从而将其转换为下拉菜单/切换按钮。以下示例演示如何将其与 <button> 元素搭配使用。

The .btn class can be converted into a dropdown menu/toggle with some markup changes. Following example demonstrates how you can use it with <button> element.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="dropdown">
    <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
    Dropdown Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Dropdown link

尽管 <button> 是下拉切换首选的控件，但在某些情况下你必须使用 <a> 。如果你这样做，我们建议包含 role="button" 属性，以便为像屏幕阅读器这样的辅助技术清晰地解释控件的功能。

Although <button> is the preferred control for a dropdown toggle, there may be times when you must use <a>. If you do, we advise including a role="button" attribute to clearly explain the function of the control to assistive technology like screen readers.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="dropdown">
        <a class="btn btn-secondary dropdown-toggle" href="#" role="button" data-bs-toggle="dropdown" aria-expanded="false">
            Dropdown Link
        </a>
        <ul class="dropdown-menu">
            <li><a class="dropdown-item" href="#">Create Account</a></li>
            <li><a class="dropdown-item" href="#">Sign in</a></li>
            <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>
</body>
</html>

Variant

使用上下文类为下拉菜单设置颜色样式。

Use contextual classes to style the dropdown menu with color.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Primary Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
    <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Secondary Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
    <button type="button" class="btn btn-danger dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Danger Dropdown
    </button>
    <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
    <button type="button" class="btn btn-info dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Info Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
    <button type="button" class="btn btn-success dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Success Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
    <button type="button" class="btn btn-light dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Light Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
    <button type="button" class="btn btn-warning dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Warning Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Split button

与单个按钮下拉菜单类似，拆分按钮下拉菜单是通过使用相同的语法来制作的，但添加了 .dropdown-toggle-split 以便在下拉插入符号周围留出足够的空间。

Similar to single button dropdowns, split button dropdowns are made by using the same syntax, but with the addition of .dropdown-toggle-split for adequate space around the dropdown caret.

使用此附加类可以将插入符号两侧的水平填充减少 25％，并移除添加到常规按钮下拉菜单的左外边距。这些附加更改使拆分按钮上的插入符号居中对齐，并且为按钮控件旁边提供一个适当大小的目标区域。

Use this additional class to reduce the horizontal padding on either side of the caret by 25% and remove the left margin added to regular button dropdowns. These additional changes center the caret on the split button and provide an appropriately sized hit area next to the main button.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
        <button type="button" class="btn btn-primary">Split Dropdown</button>
        <button type="button" class="btn btn-primary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false">
          <span class="visually-hidden">Toggle Dropdown</span>
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>
</body>
</html>

Sizing

下拉菜单可以使用任何大小的按钮，包括默认按钮和拆分下拉按钮。

The dropdown menus operate with buttons of all sizes, including the default and split dropdown buttons.

Large dropdown button

要获得下拉菜单的大尺寸按钮，请添加 class .btn-lg 以及 class .btn

To get large size buttons of dropdown menus, add class .btn-lg alongwith class .btn

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<div class="btn-group">
    <button class="btn btn-primary btn-lg dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown - Large Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
    <div class="btn-group">
      <button class="btn btn-secondary btn-lg" type="button">
           Dropdown - Large split button
      </button>
      <button type="button" class="btn btn-lg btn-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false">
        <span class="visually-hidden">Toggle Dropdown</span>
      </button>
      <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
      </ul>
    </div>
</body>
</html>

Small dropdown button

要获得下拉菜单的小尺寸按钮，请添加 class .btn-sm 以及 class .btn

To get small size buttons of dropdown menus, add class .btn-sm alognwith the class .btn

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button class="btn btn-primary btn-sm dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown - Small Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
    <div class="btn-group">
    <button class="btn btn-secondary btn-sm" type="button">
        Dropdown - Small split button
    </button>
    <button type="button" class="btn btn-sm btn-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false">
    <span class="visually-hidden">Toggle Dropdown</span>
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Dark dropdown

将 class .dropdown-menu-dark 添加至现有 .dropdown-menu 以选择深色下拉菜单以匹配深色导航栏或自定义样式。无需更改下拉菜单项。

Add the classes .dropdown-menu-dark to an existing .dropdown-menu to choose a dark dropdown to match your dark navbar or custom style. No need to change the dropdown items.

5.3.0 版中的组件深色变体已弃用，并引入了颜色模式。不要添加 .dropdown-menu-dark ，而应在根元素、父包装或组件本身上设置 data-bs-theme="dark" 。

The dark variant of components has been deprecated in v5.3.0 with the introduction of color mode. Instead of adding .dropdown-menu-dark set data-bs-theme="dark" on the root element, parent wrapper, or the component itself.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="dropdown">
    <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Dark
    </button>
    <ul class="dropdown-menu dropdown-menu-dark">
        <li><a class="dropdown-item active" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">sign out</a></li>
    </ul>
    </div>
</body>
</html>

并将它放置在导航栏中使用：

And place it for use in a navbar:

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
    <div class="container-fluid">
        <a class="navbar-brand" href="#">Navbar</a>
        <button class="navbar-toggler" type="button" data-bs-toggle="collapse" data-bs-target="#navbarNavDarkDropdown" aria-controls="navbarNavDarkDropdown" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
        </button>
        <div class="collapse navbar-collapse" id="navbarNavDarkDropdown">
            <ul class="navbar-nav">
              <li class="nav-item dropdown">
                <button class="btn btn-dark dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
                  Dropdown Dark Navbar
                </button>
                <ul class="dropdown-menu dropdown-menu-dark">
                  <li><a class="dropdown-item" href="#">Create Account</a></li>
                  <li><a class="dropdown-item" href="#">Sign in</a></li>
                  <li><a class="dropdown-item" href="#">Sign out</a></li>
                </ul>
              </li>
            </ul>
        </div>
    </div>
</body>
</html>

Directions

Centered dropdowns

在父级上使用 class .dropdown-center 将下拉菜单居中对齐在切换开关下方。

Use the class .dropdown-center on the parent to center the dropdown menu under the toggle.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

    <!DOCTYPE html>
    <html>
    <head>
    <title>Bootstrap - Dropdowns</title>
        <meta charset="UTF-8">
        <meta http-equiv="X-UA-Compatible" content="IE=edge">
        <meta name="viewport" content="width=device-width, initial-scale=1.0">
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
        <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
        <title>Bootstrap - Dropdowns</title>
    </head>
    <body>
        <div class="dropdown-center">
        <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
            Centered Dropdown
        </button>
        <ul class="dropdown-menu">
            <li><a class="dropdown-item" href="#">Create Account</a></li>
            <li><a class="dropdown-item" href="#">Sign in</a></li>
            <li><a class="dropdown-item" href="#">Sign out<a></li>
        </ul>
        </div>
    </body>
    </html>

Dropup

通过将 class .dropup 添加至父级类，可以在元素上方获取触发下拉菜单。

By adding the class .dropup to the parent class, you get the trigger dropdown menus above the elements.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group dropup" style="padding-top: 200px;">
    <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Dropup Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group dropup" style="padding-top: 200px;">
    <button type="button" class="btn btn-secondary">
        Split Dropup Button
    </button>
    <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown"
        aria-expanded="false">
    <span class="visually-hidden">Toggle Dropdown</span>
    </button>
        <ul class="dropdown-menu">
            <li><a class="dropdown-item" href="#">Create Account</a></li>
            <li><a class="dropdown-item" href="#">Sign in</a></li>
            <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>
</body>
 </html>

Dropup centered

通过将 class .dropup-center 添加至 .dropup 类，可以在元素上方居中获取触发下拉菜单。

By adding the class .dropup-center to the .dropup class, you get the trigger dropdown menus centered above the elements.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="dropup dropup-center"  style="padding-top: 200px;">
    <button class="btn btn-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Centered Dropup Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Dropend

通过将 class .dropend 添加至父级类，可以在元素右侧获取触发下拉菜单。

By adding the class .dropend to the parent class, you get the trigger dropdown menus at the right of the elements.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group dropend">
    <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Dropend Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group dropend">
    <button type="button" class="btn btn-secondary">
        Split Dropend Button
    </button>
    <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown"
        aria-expanded="false">
    <span class="visually-hidden">Toggle Dropend</span>
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Dropstart

通过将 class .dropstart 添加至父级类，可以在元素左侧获取触发下拉菜单。

By adding the class .dropstart to the parent class, you get the trigger dropdown menus at the left of the elements.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group dropstart" style="padding-left: 200px;">
    <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Dropstart Button
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group dropstart">
        <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown"
          aria-expanded="false">
        <span class="visually-hidden">Toggle Dropstart</span>
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
        <button type="button" class="btn btn-secondary">
          Split Dropstart Button
        </button>
    </div>
</body>
</html>

Menu items

可以使用元素 <a> 和 <button> 来显示下拉菜单项。

You can display the dropdown items by using elements <a> and <button>

以下示例演示了使用 <button> 元素的下拉菜单项：

Following example demonstrates dropdown items using <button> element:

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
    <title>Bootstrap - Dropdowns</title>
</head>
<body>
    <div class="dropdown">
    <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Menu Using Button
    </button>
    <ul class="dropdown-menu">
        <li><button class="dropdown-item" type="button">Create Account</button></li>
        <li><button class="dropdown-item" type="button">Sign in</button></li>
        <li><button class="dropdown-item" type="button">Sign out</button></li>
    </ul>
    </div>
</body>
</html>

以下示例演示了使用 <a> 元素的下拉菜单项：

Following example demonstrates dropdown items using <a> element:

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="dropdown">
    <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Menu Using a
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Active

要添加样式以使下拉菜单处于活动状态，请添加 .active 类。为了将活动状态传达给辅助技术，请结合现有页面的 page 值使用 aria-current 特性，或者结合集合中的当前项使用 true 。

To add style the dropdown menu as active add .active class. To communicate the active state to assistive technology, use the aria-current attribute with the page value of the existing page, or true for the current item in the set.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

    <!DOCTYPE html>
    <html>
    <head>
      <title>Bootstrap - Dropdowns</title>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
      <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
    </head>
    <body>
      <div class="dropdown">
        <button class="btn btn-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
          Dropdown Menu
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item active" href="#" aria-current="true">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
      </div>
    </body>
    </html>

Disabled

要禁用下拉菜单，请添加 .disabled 类。

To make the dropdown menu disabled add .disabled class.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="dropdown">
    <button class="btn btn-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Menu
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item disabled">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Menu alignment

Dropdowns are positioned by default 100% from the top and along the left side of its parent.
By using .drop* classes, you can change the direction of the dropdown menu. You can also handle them with some other modifier classes.
Get the dropdown menu right aligned by adding class .dropdown-menu-end to .dropdown-menu.
.dropdown-menu-end will appear on the left side when using Bootstrap in RTL.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Right-aligned Dropdown Menu
    </button>
    <ul class="dropdown-menu dropdown-menu-end">
        <li><button class="dropdown-item" type="button">Create Account</button></li>
        <li><button class="dropdown-item" type="button"> Sign in</button></li>
        <li><button class="dropdown-item" type="button">Sign out</button></li>
    </ul>
    </div>
</body>
</html>

Responsive alignment

要实现自适应对齐，添加 data-bs-display="static" 属性以禁用动态定位并使用自适应变体类。

For responsive alignment, add the data-bs-display="static" attribute to disable dynamic positioning and use responsive variation classes.

添加 .dropdown-menu{-sm|-md|-lg|-xl|-xxl}-end 以将下拉菜单定位到指定断点的 right 中。

Add .dropdown-menu{-sm|-md|-lg|-xl|-xxl}-end to position the dropdown menu to the right of the specified breakpoint.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" data-bs-display="static" aria-expanded="false">
        Left-aligned but right aligned for large screen
    </button>
    <ul class="dropdown-menu dropdown-menu-lg-end">
        <li><button class="dropdown-item" type="button">Create Account</button></li>
        <li><button class="dropdown-item" type="button">Sign in</button></li>
        <li><button class="dropdown-item" type="button">Sign out</button></li>
    </ul>
    </div>
</body>
</html>

添加 .dropdown-menu-end 和 .dropdown-menu{-sm|-md|-lg|-xl|-xxl}-start 以将下拉菜单对齐到指定断点或其出现的 left 中。

Add .dropdown-menu-end and .dropdown-menu{-sm|-md|-lg|-xl|-xxl}-start to align the dropdown menu to the left of the specified breakpoint or beyond to do.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" data-bs-display="static" aria-expanded="false">
        Right-aligned but left aligned for large screen
    </button>
    <ul class="dropdown-menu dropdown-menu-end dropdown-menu-lg-start">
        <li><button class="dropdown-item" type="button">Create Account</button></li>
        <li><button class="dropdown-item" type="button">Sign in</button></li>
        <li><button class="dropdown-item" type="button">Sign out</button></li>
    </ul>
    </div>
</body>
</html>

Alignment options

将以上示例中显示的大多数选项放在一处。

Put most of the options shown in the above examples in one place.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button class="btn btn-Primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Menu
    </button>
    <ul class="dropdown-menu">
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>

    <div class="btn-group">
        <button type="button" class="btn btn-secondary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
          Right-aligned Menu
        </button>
        <ul class="dropdown-menu dropdown-menu-end">
          <li><a class="dropdown-item" href="#">Create Account </a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>

    <div class="btn-group">
        <button type="button" class="btn btn-info dropdown-toggle" data-bs-toggle="dropdown" data-bs-display="static" aria-expanded="false">
          Left-aligned, right-aligned lg Dropdown
        </button>
        <ul class="dropdown-menu dropdown-menu-lg-end">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>

    <div class="btn-group">
        <button type="button" class="btn btn-success dropdown-toggle" data-bs-toggle="dropdown" data-bs-display="static" aria-expanded="false">
          Right-aligned, left-aligned lg Dropdown
        </button>
        <ul class="dropdown-menu dropdown-menu-end dropdown-menu-lg-start">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>

    <div class="btn-group dropstart">
        <button type="button" class="btn btn-danger dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
          Dropstart Dropdown
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>

    <div class="btn-group dropend">
        <button type="button" class="btn btn-warning dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
          Dropend Dropdown
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>

    <div class="btn-group dropup">
        <button type="button" class="btn btn-light dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
          Dropup Dropdown
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
    </div>
</body>
</html>

Menu content

Headers

添加 .dropdown-header 类以添加标头以标记下拉菜单的部分。

Add the class .dropdown-header to add a header to label sections of the dropdown menu.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown
    </button>
    <ul class="dropdown-menu">
        <li><h6 class="dropdown-header">Dropdown Header</h6></li>
        <li><a class="dropdown-item" href="#">Create Account</a></li>
        <li><a class="dropdown-item" href="#">Sign in</a></li>
        <li><a class="dropdown-item" href="#">Sign out</a></li>
    </ul>
    </div>
</body>
</html>

Dividers

添加 .dropdown-divider 类以使用分隔线分隔相关的菜单元素组。

Add the class .dropdown-divider to separate groups of related menu elements with a divider.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
        <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false">
          Dropdown
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
          <li><hr class="dropdown-divider"></li>
          <li><a class="dropdown-item" href="#">Others</a></li>
        </ul>
    </div>
</body>
</html>

Text

使用文本将随意文本放入下拉菜单中，并使用 spacing utilities 。请注意，可能需要其他大小样式以限制菜单的宽度。

Place free-form text in drop-down menus with text and use the spacing utilities. Note that additional size styles may be required to limit the width of the menu.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Menu With Text
    </button>
    <div class="dropdown-menu p-4 text-body-secondary" style="max-width: 200px;">
    <p>
        example of dropdown menu with text.
    </p>
    <p class="mb-0">
            more examples of text.
    </p>
    </div>
    </div>
</body>
</html>

Forms

添加或创建表单以进行下拉菜单功能，并使用任何 margin or padding utility 提供必要的负空间。

Add or create a form for the dropdown menu and use any margin or padding utility to provide the necessary negative space.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
    <div class="btn-group">
    <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" aria-expanded="false">
        Dropdown Menu Form
    </button>
    <div class="dropdown-menu">
        <form class="px-4 py-3">
            <div class="mb-3">
              <label for="exampleDropdownFormEmail1" class="form-label">Email Id</label>
              <input type="email" class="form-control" id="exampleDropdownFormEmail1" placeholder="example123@gmail.com">
            </div>
            <div class="mb-3">
              <label for="exampleDropdownFormPassword1" class="form-label">Password</label>
              <input type="password" class="form-control" id="exampleDropdownFormPassword1" placeholder="Password">
            </div>
            <button type="submit" class="btn btn-primary">Log in</button>
        </form>
        <div class="dropdown-divider"></div>
        <a class="dropdown-item" href="#">Forgot password?</a>
        <a class="dropdown-item" href="#">Create new account</a>
    </div>
    </div>
</body>
</html>

Dropdown options

要更改下拉菜单的位置，请添加 data-bs-offset 或 data-bs-reference 类。

To change the location of the dropdown menu add the classes data-bs-offset or data-bs-reference.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

<!DOCTYPE html>
<html>
<head>
    <title>Bootstrap - Dropdowns</title>
    <meta charset="UTF-8">
    <meta http-equiv="X-UA-Compatible" content="IE=edge">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
    <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
</head>
<body>
<div class="d-flex">
    <div class="dropdown me-1">
        <button type="button" class="btn btn-primary dropdown-toggle" data-bs-toggle="dropdown" aria-expanded="false" data-bs-offset="10,20">
            Offset Dropdown
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
      </div>
      <div class="btn-group">
        <button type="button" class="btn btn-secondary">Reference Dropdown</button>
        <button type="button" class="btn btn-secondary dropdown-toggle dropdown-toggle-split" data-bs-toggle="dropdown" aria-expanded="false" data-bs-reference="parent">
          <span class="visually-hidden">Toggle Dropdown</span>
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
          <li><hr class="dropdown-divider"></li>
          <li><a class="dropdown-item" href="#">Others</a></li>
        </ul>
    </div>
    </div>
</body>
</html>

Auto close behavior

当您单击下拉菜单内部或外部时，下拉菜单会自动关闭。通过使用 autoClose 选项，您可以更改下拉菜单的此行为。

When you click inside or outside the dropdown menu the dropdown menu is automatically closed. By using the autoClose option you can change this behavior of the dropdown.

Example

您可以使用*编辑和运行*选项编辑并尝试运行此代码。

You can edit and try running this code using *Edit & Run *option.

    <!DOCTYPE html>
    <html>
    <head>
      <title>Bootstrap - Dropdowns</title>
      <meta charset="UTF-8">
      <meta http-equiv="X-UA-Compatible" content="IE=edge">
      <meta name="viewport" content="width=device-width, initial-scale=1.0">
      <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/css/bootstrap.min.css" rel="stylesheet">
      <script src="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0-alpha3/dist/js/bootstrap.bundle.min.js"></script>
    </head>
    <body>
      <div class="btn-group">
        <button class="btn btn-primary dropdown-toggle" type="button" data-bs-toggle="dropdown" data-bs-auto-close="true" aria-expanded="false">
          Basic Dropdown
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
      </div>

      <div class="btn-group">
        <button class="btn btn-secondary dropdown-toggle" type="button" data-bs-toggle="dropdown" data-bs-auto-close="inside" aria-expanded="false">
          Menu Close Clickable Inside
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
      </div>

      <div class="btn-group">
        <button class="btn btn-info dropdown-toggle" type="button" data-bs-toggle="dropdown" data-bs-auto-close="outside" aria-expanded="false">
          Menu Close Clickable Outside
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
      </div>

      <div class="btn-group">
        <button class="btn btn-danger dropdown-toggle" type="button" data-bs-toggle="dropdown" data-bs-auto-close="false" aria-expanded="false">
          Manual Close
        </button>
        <ul class="dropdown-menu">
          <li><a class="dropdown-item" href="#">Create Account</a></li>
          <li><a class="dropdown-item" href="#">Sign in</a></li>
          <li><a class="dropdown-item" href="#">Sign out</a></li>
        </ul>
      </div>
    </body>
    </html>