Bootstrap - 下拉選單

上一頁
下一頁

本章將討論 Bootstrap 下拉選單。下拉選單是可以切換的上下文選單，可以啟用以列表格式顯示連結。這可以透過使用下拉 JavaScript 外掛來實現互動。

在檢查下拉選單的示例和功能之前，需要注意一些要點。

  • 下拉選單是使用Popper構建的，Popper 是一個第三方庫。Popper 提供動態定位和視口檢測。

  • 在 Bootstrap 的 JavaScript 之前包含popper.min.js，或者使用bootstrap.bundle.min.js或bootstrap.bundle.js，它們包含 Popper。

  • 由於不需要動態定位，因此不會使用 Popper 來放置導航欄中的下拉選單。

基本下拉選單

下拉選單的切換按鈕（按鈕或連結）和下拉選單需要包裝在.dropdown或宣告position: relative;的其他元素中。我們可以使用<button>元素作為下拉觸發器，但該外掛也可以與<a>元素一起使用。以下示例在適當的地方使用<ul>元素，但支援自定義標記。

下拉按鈕

透過一些標記更改，可以將.btn類轉換為下拉選單/切換按鈕。以下示例演示瞭如何將其與<button>元素一起使用。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

下拉鍊接

雖然<button>是下拉切換的首選控制元件，但在某些情況下您可能必須使用<a>。如果您這樣做，我們建議包含role="button"屬性以向螢幕閱讀器等輔助技術清楚地解釋控制元件的功能。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

變體

使用上下文類以顏色樣式化下拉選單。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

分割按鈕

與單個按鈕下拉選單類似，分割按鈕下拉選單是透過使用相同的語法建立的，但添加了.dropdown-toggle-split以在下拉選單插入符號周圍提供足夠的間距。

使用此附加類可將插入符號兩側的水平填充減少 25%，並刪除新增到常規按鈕下拉選單的左邊距。這些額外的更改將插入符號居中在分割按鈕上，並在主按鈕旁邊提供適當大小的點選區域。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

大小

下拉選單可與所有尺寸的按鈕一起使用，包括預設按鈕和分割下拉按鈕。

大型下拉按鈕

要獲取大型下拉選單按鈕，請將類.btn-lg與類.btn一起新增。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

小型下拉按鈕

要獲取小型下拉選單按鈕，請將類.btn-sm與類.btn一起新增。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

深色下拉選單

在 v5.3.0 中已棄用

將類.dropdown-menu-dark新增到現有的.dropdown-menu中，以選擇與深色導航欄或自定義樣式匹配的深色下拉選單。無需更改下拉選單項。

隨著顏色模式的引入，元件的深色變體在 v5.3.0 中已棄用。無需新增.dropdown-menu-dark，只需在根元素、父包裝器或元件本身設定data-bs-theme="dark"即可。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

並將其放置在導航欄中使用

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

方向

在 RTL 模式下，方向會反轉。您將在右側看到.dropstart。

居中的下拉選單

在父元素上使用類.dropdown-center將下拉選單居中在切換按鈕下方。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

    <!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>

向上型下拉選單

透過在父類中新增類.dropup，您可以在元素上方獲取觸發下拉選單。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

居中的向上型下拉選單

透過在.dropup類中新增類.dropup-center，您可以在元素上方獲取居中的觸發下拉選單。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

右側下拉選單

透過在父類中新增類.dropend，您可以在元素右側獲取觸發下拉選單。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

左側下拉選單

透過在父類中新增類.dropstart，您可以在元素左側獲取觸發下拉選單。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

選單項

您可以使用元素<a>和<button>顯示下拉選單項。

以下示例演示了使用<button>元素的下拉選單項。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>元素的下拉選單項。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

活動狀態

要將下拉選單樣式化為活動狀態，請新增.active類。為了向輔助技術傳達活動狀態，請使用aria-current屬性以及現有頁面的page值，或者對於集合中的當前項使用true。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

    <!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>

停用狀態

要使下拉選單停用，請新增.disabled類。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

選單對齊

  • 預設情況下，下拉選單從其父元素的頂部 100% 和左側開始定位。

  • 透過使用.drop*類，您可以更改下拉選單的方向。您還可以使用其他一些修飾符類來處理它們。

  • 透過將類.dropdown-menu-end新增到.dropdown-menu，可以使下拉選單右對齊。

  • 當在 RTL 中使用 Bootstrap 時，.dropdown-menu-end將出現在左側。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

響應式對齊

對於響應式對齊，請將data-bs-display="static"屬性新增到停用動態定位並使用響應式變體類。

新增.dropdown-menu{-sm|-md|-lg|-xl|-xxl}-end以將下拉選單定位到指定斷點的右側。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

新增.dropdown-menu-end和.dropdown-menu{-sm|-md|-lg|-xl|-xxl}-start以將下拉選單對齊到指定斷點的左側或更遠的位置。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

對齊選項

將上面示例中顯示的大多數選項放在一個地方。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

選單內容

標題

新增類.dropdown-header以新增標題來標記下拉選單的部分。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

分隔線

新增類.dropdown-divider以使用分隔線分隔相關選單元素組。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

文字

使用文字在下拉選單中放置自由格式文字，並使用間距實用程式。請注意，可能需要其他尺寸樣式來限制選單的寬度。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

表單

為下拉選單新增或建立表單，並使用任何邊距或填充實用程式提供必要的負空間。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

下拉選項

要更改下拉選單的位置，請新增類data-bs-offset或data-bs-reference。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

<!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>

自動關閉行為

當您單擊下拉選單內部或外部時，下拉選單會自動關閉。透過使用 autoClose 選項，您可以更改下拉選單的此行為。

示例

您可以使用編輯和執行選項編輯和嘗試執行此程式碼。

    <!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>
列印頁面
上一頁
下一頁
廣告