Question

我从 https://getbootstrap.com/docs/5.0/components/dropdowns/ 的第一个示例中复制的下拉代码但它确实像那里一样工作。我使用 Bootstrap v5.0.0-beta2。我将所有代码粘贴到以下内容中：

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link rel="stylesheet" href="bootstrap/css/bootstrap.min.css">
    </head>

    <body>
        <script src="jQuery/jquery-3.6.0.min.js"></script>
        <script src="js/popper.min.js"></script>
        <script src="bootstrap/js/bootstrap.esm.min.js"></script>
        <script src="bootstrap/js/bootstrap.bundle.min.js"></script>
        <script src="bootstrap/js/bootstrap.min.js"></script>

        <div class="dropdown">
            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
                Dropdown button
            </button>
            <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
                <li><a class="dropdown-item" href="#">Action</a></li>
                <li><a class="dropdown-item" href="#">Another action</a></li>
                <li><a class="dropdown-item" href="#">Something else here</a></li>
            </ul>
        </div>
    </body>
</html>

Answer 1

您需要包含 boostrap.min.js 和 popper.min.js 脚本才能使下拉菜单正常工作。

下拉列表基于第三方库 Popper.js 构建，该库提供动态定位和视口检测。确保在 Bootstrap 的 JavaScript 之前包含 popper.min.js 或使用包含 Popper.js 的 bootstrap.bundle.min.js / bootstrap.bundle.js。尽管不需要动态定位，但 Popper.js 不用于在导航栏中定位下拉列表。

Boostrap Dropdowns

Answer 2

我认为这是Bootstrap本身的问题。当我改回 v4.6.0 https://getbootstrap.com/docs/4.6/getting-started/download/ 时，它起作用了。

Answer 3

没有 jQuery 的 BS-v5 --> Bootstrap Bundle with Popper
因此，您只能使用一个文件包含并检查如下代码段。

<!doctype html>
<html lang="en">
  <head>
    <!-- Required meta tags -->
    <meta charset="utf-8">
    <meta name="viewport" content="width=device-width, initial-scale=1">
    <!-- Bootstrap CSS -->
    <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BmbxuPwQa2lc/FVzBcNJ7UAyJxM6wuqIj61tLrc4wSX0szH/Ev+nYRRuWlolflfl" crossorigin="anonymous">
    <title>BS-v5</title>
  </head>
  <body>
  <div class="container py-1">
    <div class="row">
      <div class="col-sm-12">
        <h1>Bootstrap v5.0.0-beta2</h1>
          <div class="dropdown">
            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
                Dropdown button
            </button>
            <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
                <li><a class="dropdown-item" href="#">Action</a></li>
                <li><a class="dropdown-item" href="#">Another action</a></li>
                <li><a class="dropdown-item" href="#">Something else here</a></li>
            </ul>
        </div>
      </div>
    </div>
 </div>
 
<!-- Bootstrap Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.bundle.min.js" integrity="sha384-b5kHyXgcpbZJO/tY9Ul7kGkf1S0CWuKcCD38l8YkeH8z8QjE0GmW1gYU5S9FOnJ0" crossorigin="anonymous"></script>
</body>
</html>

Answer 4

在结束 </body> 标记之前添加脚本标记，而不是在它之后或 body 的开头

还要使用bootstrap主页上的jsDelivr方法

https://getbootstrap.com/

<!DOCTYPE html>
<html>
    <head>
        <meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
        <link href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-BmbxuPwQa2lc/FVzBcNJ7UAyJxM6wuqIj61tLrc4wSX0szH/Ev+nYRRuWlolflfl" crossorigin="anonymous">
    </head>

    <body>
        <div class="dropdown">
            <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
                Dropdown button
            </button>
            <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
                <li><a class="dropdown-item" href="#">Action</a></li>
                <li><a class="dropdown-item" href="#">Another action</a></li>
                <li><a class="dropdown-item" href="#">Something else here</a></li>
            </ul>
        </div>
        <!-- JavaScript Bundle with Popper -->
<script src="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta2/dist/js/bootstrap.bundle.min.js" integrity="sha384-b5kHyXgcpbZJO/tY9Ul7kGkf1S0CWuKcCD38l8YkeH8z8QjE0GmW1gYU5S9FOnJ0" crossorigin="anonymous"></script>
    </body>
</html>

引导程序的下拉按钮不起作用

4 个答案: