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css - bootstrap 下拉菜单 3.3.7 子菜单不展开

问题描述

我将这里的代码粘贴到我的 Web 应用程序中。除了 Service C下拉子菜单外，它都有效。我看不到Service C1……Service C5

<ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#about">About</a></li>
        <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true"> <span class="nav-label">Services</span> <span class="caret"></span></a>
            <ul class="dropdown-menu">
                <li><a href="#">Service A</a></li>
                <li><a href="#">Service B</a></li>
                <li class="dropdown-submenu">
                    <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="false"> <span class="nav-label">Service C</span><span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Service C1</a></li>
                        <li><a href="#">Service C2</a></li>
                        <li><a href="#">Service C3</a></li>
                        <li><a href="#">Service C4</a></li>
                        <li><a href="#">Service C5</a></li>
                    </ul>
                </li>
            </ul>
        </li>
    </ul>

该页面现在写道：

The support for sub-menu was disabled in latest version of bootstrap. The option can be re-enabled by including a small CSS.

你知道需要的 CSS 以及放在哪里吗？

我正在使用 bootstrap 3.3.7 并且不想更改此版本。

标签： csstwitter-bootstraptwitter-bootstrap-3

解决方案

我做了一些改变看到它

$(document).ready(function(){
  $('.dropdown-submenu a.test').on("click", function(e){
    $(this).next('ul').toggle();
    e.stopPropagation();
    e.preventDefault();
  });
});
<!DOCTYPE html>
<html>
<head>
  <meta name="viewport" content="width=device-width, initial-scale=1">
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/css/bootstrap.min.css">
  <script src="https://ajax.googleapis.com/ajax/libs/jquery/3.4.1/jquery.min.js"></script>
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.4.0/js/bootstrap.min.js"></script>
<style>
.dropdown-submenu {
  position: relative;
}

.dropdown-submenu .dropdown-menu {
  top: 0;
  left: 100%;
  margin-top: -1px;
}
</style>
</head>
<body>
   
<div class="container">                                      
 <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a></li>
        <li><a href="#about">About</a></li>
        <li class="dropdown">
            <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true"> <span class="nav-label">Services</span> <span class="caret"></span></a>
            <ul class="dropdown-menu">
                <li><a href="#">Service A</a></li>
                <li><a href="#">Service B</a></li>
                <li class="dropdown-submenu">
                    <a class="test" href="#">Service C <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="#">Service C1</a></li>
                        <li><a href="#">Service C2</a></li>
                        <li><a href="#">Service C3</a></li>
                        <li><a href="#">Service C4</a></li>
                        <li><a href="#">Service C5</a></li>
                    </ul>
                </li>
            </ul>
        </li>
    </ul>
</div>



</body>
</html>

我刚刚克隆了你在评论中提到的 repo，我把我的代码粘贴到了那里，它工作正常，看看下面我没有更新任何东西

在你的项目中

<!DOCTYPE html>
<html>
<head>
    <meta charset="utf-8" />
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>@ViewBag.Title - My ASP.NET Application</title>
    @Styles.Render("~/Content/css")
    @Scripts.Render("~/bundles/modernizr")
    <style>
        .dropdown-submenu {
            position: relative;
        }

       .dropdown-submenu .dropdown-menu {
                top: 0;
                left: 100%;
               margin-top: -1px;
        }
    </style>
</head>
<body>
    <div class="navbar navbar-inverse navbar-fixed-top">
        <div class="container">
            <div class="navbar-header">
                <button type="button" class="navbar-toggle" data-toggle="collapse" data-target=".navbar-collapse">
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                    <span class="icon-bar"></span>
                </button>
                <a href="http://tech.trailmax.info" class="navbar-brand">tech.trailmax.info</a>
            </div>
            <div class="navbar-collapse collapse">
                <ul class="nav navbar-nav">
                    <li class="active"><a href="#">Home</a></li>
                    <li><a href="#about">About</a></li>
                    <li class="dropdown">
                        <a href="#" class="dropdown-toggle" data-toggle="dropdown" role="button" aria-haspopup="true" aria-expanded="true"> <span class="nav-label">Services</span> <span class="caret"></span></a>
                        <ul class="dropdown-menu">
                            <li><a href="#">Service A</a></li>
                            <li><a href="#">Service B</a></li>
                            <li class="dropdown-submenu">
                                <a class="test" href="#">Service C <span class="caret"></span></a>
                                <ul class="dropdown-menu">
                                    <li><a href="#">Service C1</a></li>
                                    <li><a href="#">Service C2</a></li>
                                    <li><a href="#">Service C3</a></li>
                                    <li><a href="#">Service C4</a></li>
                                    <li><a href="#">Service C5</a></li>
                                </ul>
                            </li>
                        </ul>
                    </li>
                </ul>
                @Html.Partial("_LoginPartial")
            </div>
        </div>
    </div>
    <div class="container body-content">
        @RenderBody()
        <hr />
        <footer>
            <p>&copy; @DateTime.Now.Year - My ASP.NET Application</p>
        </footer>
    </div>

    @Scripts.Render("~/bundles/jquery")
    @Scripts.Render("~/bundles/bootstrap")
    <script>
        $(document).ready(function () {
            $('.dropdown-submenu a.test').on("click", function (e) {
                $(this).next('ul').toggle();
                e.stopPropagation();
                e.preventDefault();
            });
        });
    </script>
    @RenderSection("scripts", required: false)
</body>
</html>

看下面的图片

在此处输入图像描述

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