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html-bootstrap导航栏下拉不会在单击或悬停时打开-堆栈溢出

顺晟科技

2022-10-19 11:51:56

68

下拉导航元素无论出于什么原因都不能工作（这意味着下拉菜单不能出现）我已经查看了我能找到的所有引导文档。我最初认为问题是我在带有导航链接的react-router dom中使用它。我意识到我应该试着把它放入一个普通的HTML文档来确认这一点，但发现它仍然不起作用...

   <!DOCTYPE html>
<html lang="en">

<head>
    <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 rel="stylesheet" href="./style.css">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css">
    <title>Document</title>
</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01"
            aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Home</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Link</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" activeClass="active" id="navbarDropdown" role="button"
                        data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Dropdown
                    </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" activeClass="active">Action</a>
                        <a class="dropdown-item" activeClass="active">Another action</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" activeClass="active">Something else here</a>
                    </div>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" activeClass="active">Disabled</a>
                </li>
            </ul>
        </div>
    </nav>
</body>

</html>

顺晟科技：

1)您的代码中有一个问题，您已经使用过，但应该是

应该

   <!DOCTYPE html>
<html lang="en">

<head>
    <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 rel="stylesheet" href="./style.css">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css">
    <title>Document</title>
</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01"
            aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Home</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Link</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" activeClass="active" id="navbarDropdown" role="button"
                        data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Dropdown
                    </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" activeClass="active">Action</a>
                        <a class="dropdown-item" activeClass="active">Another action</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" activeClass="active">Something else here</a>
                    </div>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" activeClass="active">Disabled</a>
                </li>
            </ul>
        </div>
    </nav>
</body>

</html>

而不是

   <!DOCTYPE html>
<html lang="en">

<head>
    <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 rel="stylesheet" href="./style.css">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css">
    <title>Document</title>
</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01"
            aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Home</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Link</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" activeClass="active" id="navbarDropdown" role="button"
                        data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Dropdown
                    </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" activeClass="active">Action</a>
                        <a class="dropdown-item" activeClass="active">Another action</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" activeClass="active">Something else here</a>
                    </div>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" activeClass="active">Disabled</a>
                </li>
            </ul>
        </div>
    </nav>
</body>

</html>

2)确保包含引导JS文件

   <!DOCTYPE html>
<html lang="en">

<head>
    <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 rel="stylesheet" href="./style.css">
    <link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap@5.0.0-beta1/dist/css/bootstrap.min.css">
    <title>Document</title>
</head>

<body>
    <nav class="navbar navbar-expand-lg navbar-dark bg-dark">
        <button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarTogglerDemo01"
            aria-controls="navbarTogglerDemo01" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <div class="collapse navbar-collapse" id="navbarTogglerDemo01">
            <ul class="navbar-nav mr-auto">
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Home</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" activeClass="active">Link</a>
                </li>
                <li class="nav-item dropdown">
                    <a class="nav-link dropdown-toggle" activeClass="active" id="navbarDropdown" role="button"
                        data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                        Dropdown
                    </a>
                    <div class="dropdown-menu" aria-labelledby="navbarDropdown">
                        <a class="dropdown-item" activeClass="active">Action</a>
                        <a class="dropdown-item" activeClass="active">Another action</a>
                        <div class="dropdown-divider"></div>
                        <a class="dropdown-item" activeClass="active">Something else here</a>
                    </div>
                </li>
                <li class="nav-item">
                    <a class="nav-link disabled" activeClass="active">Disabled</a>
                </li>
            </ul>
        </div>
    </nav>
</body>

</html>

3)应更改按钮上的to和to。

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