Bootstrap导航栏下拉菜单在移动设备中不起作用

Question

I'm having an issue where a dropdown menu in my navbar works on a desktop, but doesn't expand in mobile.

Here is the live site: http://launchsummer.org/

If you shrink the page to mobile-sized, you'll see that the "launch summer" dropdown does not expand.

Here is the code for the navbar:

<!-- Navigation -->
<!-- Note: navbar-default and navbar-inverse are both supported with this theme. -->
<nav class="navbar navbar-inverse navbar-fixed-top navbar-expanded">
    <div class="container">
        <!-- Brand and toggle get grouped for better mobile display -->
        <div class="navbar-header">
            <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#bs-example-navbar-collapse-1">
                <span class="sr-only">Toggle navigation</span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
                <span class="icon-bar"></span>
            </button>
            <a class="navbar-brand" href="[[~1]]">
                <img src="assets/logo-nav@2x.png" class="img-responsive" alt="">
            </a>
        </div>

        <!-- Collect the nav links, forms, and other content for toggling -->
        <div class="collapse navbar-collapse" id="bs-example-navbar-collapse-1">
            <ul class="nav navbar-nav navbar-right">
                <li class="hidden">
                    <a href="#page-top"></a>
                </li>
                <li>
                    <a href="[[~1]]">Home</a>
                </li>
                <li>
                    <a href="[[~3]]">About Us</a>
                </li>
                <li class="dropdown">
                <a class="dropdown-toggle" data-toggle="dropdown" href="#">Launch Summer <span class="caret"></span></a>
                    <ul class="dropdown-menu">
                        <li><a href="[[~4]]"><font color="#080A21">Program Details</font></a></li>
                        <li><a href="[[~5]]"><font color="#080A21">FAQ</font></a></li>
                        <li><a href="[[~6]]"><font color="#080A21">Launch Alumni</font></a></li>
                        <li><a href="[[~2]]"><font color="#080A21">Past Companies</font></a></li>
                        <li role="separator" class="divider"></li>
                        <li><a href="https://launch.fluidreview.com/" target="_blank"><font color="#080A21">Apply!</font></a></li>
                    </ul>
                </li>
                <li>
                    <a href="https://www.edx.org/course/becoming-entrepreneur-mitx-launch-x" target="_blank">LaunchX</a>
                </li>
                <li>
                    <a href="http://www.mitlaunchclubs.com" target="_blank">Launch Clubs</a>
                </li>
                <li>
                    <a href="https://launchsummer.wordpress.com/" target="_blank">Blog</a>
                </li>
            </ul>
        </div>
        </div>
        <!-- /.navbar-collapse -->
    <!-- /.container -->
</nav>

Answer 1

所以下拉列表打开，但同时关闭，因为链接内的beCaUse拥有href =“＃” delete dropdown子元素a href属性

Answer 2

In your vitality.js, at line 23 to 26, you have this function :

// Closes the Responsive Menu on Menu Item Click
$('.navbar-collapse ul li a').click(function() {
    $('.navbar-toggle:visible').click();
});

So when we click on any item, the menu is closed. You can do this to prevent the menu from closing when you click on a dropdown menu.

// Closes the Responsive Menu on Menu Item Click
$('.navbar-collapse ul li:not(.dropdown) a').click(function() {
    $('.navbar-toggle:visible').click();
});