Question

所以我有我的代码：

<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="collapse navbar-collapse" id="navbarNavDropdown">
        <ul class="navbar-nav">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Features</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Pricing</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Dropdown link
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
        </ul>
    </div>
</nav>

当按下图标时折叠菜单时它不会下拉......

此外，我已经在bootstrap教程页面上复制了粘贴示例 https://v4-alpha.getbootstrap.com/components/navbar/

 <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css" integrity="sha384-PsH8R72JQ3SOdhVi3uxftmaW6Vc51MKb0q5P2rRUpPvrszuE4W1povHYgTpBfshb" crossorigin="anonymous">
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js" integrity="sha384-alpBpkh1PFOepccYVYDB4do5UnbKysX5WZXm3XxPqe5iKTfUKjNkCk9SaVuEZflJ" crossorigin="anonymous"></script>
  <script src="https://code.jquery.com/jquery-3.2.1.slim.min.js" integrity="sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN" crossorigin="anonymous"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js" integrity="sha384-vFJXuSJphROIrBnz7yo7oB41mKfc8JzQZiCq4NCceLEaO4IHwicKwpJf9c9IpFgh" crossorigin="anonymous"></script>

并且导航切换器图标显示在我的左边+它没有扩展，即使是大屏幕+它没有显示菜单..

为什么会发生这种情况？错误？我有最后一个版本的Angular CLI和最后一个版本的Bootstrap。

我正在使用CDN

public Component getSiteForm(SiteRequest requestData, LocationRequest locationRequest, boolean isReadOnly) {

    FormLayout siteForm = new FormLayout();
    siteForm.setStyleName("outlined");
    siteForm.setSizeFull();

    DefaultFormBuilder defaultSiteFormBuilder = new DefaultFormBuilder(siteForm, isReadOnly);
    final BeanValidationBinder<SiteRequest> siteBinder = new BeanValidationBinder<SiteRequest>(SiteRequest.class);
    siteBinder.setBean(requestData);

    final BeanValidationBinder<LocationRequest> locationBinder = new BeanValidationBinder<LocationRequest>(
            LocationRequest.class);
    locationBinder.setBean(locationRequest);

TextField nameField = defaultSiteFormBuilder.getTextField("Site Name");
    siteBinder.bind(nameField, "name");
    nameField.setWidth(SharkManagerConstant.DEFAULT_TEXT_FIELD_SIZE);

TextField zipcodeField = defaultSiteFormBuilder.getTextField("Zipcode");
    locationBinder.forField(zipcodeField).withNullRepresentation("560047")
            .withConverter(new StringToLongConverter("Please enter Zipcode")).bind("zipcode");
    zipcodeField.setWidth(SharkManagerConstant.DEFAULT_TEXT_FIELD_SIZE);
return siteForm;
}

Answer 1

似乎js尚未在你的页面上运行，请检查js文件是否实际被调用

Answer 2

我被添加到CDN文件下面，现在它可以正常工作。

<meta name="viewport" content="width=device-width, initial-scale=1"> <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css"> <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script>

  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
  <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.0/js/bootstrap.min.js"></script><div class="container">
    <nav class="navbar navbar-expand-md navbar-light bg-faded" id="menutop">
        <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#nav-content" aria-controls="nav-content" aria-expanded="false" aria-label="Toggle navigation">
            <span class="navbar-toggler-icon"></span>
        </button>

        <!-- Brand -->
        <a class="navbar-brand" href="#">
            BRAND
        </a>


        <!-- Links -->
        <div class="collapse navbar-collapse justify-content-end" id="nav-content">
            <ul class="navbar-nav">
                <li class="nav-item">
                    <a class="nav-link" href="#">COMO FUNCIONA</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">TRABAJA CON NOSOTROS</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">TIENDA</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">BLOG</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">EQUIPO</a>
                </li>
                <li class="nav-item">
                    <a class="nav-link" href="#">REPARA</a>
                </li>
            </ul>
        </div>
    </nav>
</div>
 
<nav class="navbar navbar-toggleable-md navbar-light bg-faded">
    <button class="navbar-toggler navbar-toggler-right" type="button" data-toggle="collapse" data-target="#navbarNavDropdown" aria-controls="navbarNavDropdown" aria-expanded="false" aria-label="Toggle navigation">
        <span class="navbar-toggler-icon"></span>
    </button>
    <a class="navbar-brand" href="#">Navbar</a>
    <div class="collapse navbar-collapse" id="navbarNavDropdown">
        <ul class="navbar-nav">
            <li class="nav-item active">
                <a class="nav-link" href="#">Home <span class="sr-only">(current)</span></a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Features</a>
            </li>
            <li class="nav-item">
                <a class="nav-link" href="#">Pricing</a>
            </li>
            <li class="nav-item dropdown">
                <a class="nav-link dropdown-toggle" href="http://example.com" id="navbarDropdownMenuLink" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
                    Dropdown link
                </a>
                <div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
                    <a class="dropdown-item" href="#">Action</a>
                    <a class="dropdown-item" href="#">Another action</a>
                    <a class="dropdown-item" href="#">Something else here</a>
                </div>
            </li>
        </ul>
    </div>
</nav>

bootstrap4导航无法正常工作

2 个答案: