如何使此下拉菜单与其父级显示在同一行？

Question

I'm trying to build a vertical menu with bootstrap4beta and dropdown-menu . I want the dropdown to appear on the right. But with dropdown-menu-right I can only make it appear in the next line and not on the same. How to do that?

 <script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script> <script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.11.0/umd/popper.min.js"></script> <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js"></script> <link href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet"/> <nav class="nav flex-column col-4 col-sm-4 col-md-4 col-lg-4 col-xl-4"> <a class="nav-link active backgroundnav" href="#">HTML</a> <a class="nav-link backgroundnav" href="#">CSS</a> <a class="nav-link backgroundnav" href="#">JavaScript</a> <li class="nav-item dropdown"> <a class="nav-link dropdown-toggle backgroundnav" data-toggle="dropdown" href="#" role="button" aria-haspopup="true" aria-expanded="false"> Preview </a> <div class="dropdown-menu dropdown-menu-right" aria-labelledby="Preview"> <a class="dropdown-item" href="#">Mobile Phone</a> <a class="dropdown-item" href="#">Tablet</a> <a class="dropdown-item" href="#">Laptop</a> <a class="dropdown-item" href="#">Desktop</a> </div> </li> </nav> 

Thanks.

Answer 1

Bootstrap 4 popper.js is positioning the dropdown so it's not easy to customize the positioning. You could override with some CSS like this, but the tricky part is figuring the "65%" value which is based on the width of the dropdown link.

.dropdown-menu-side {
    transform: translateX(65%) !important;
}

https://www.codeply.com/go/BI2Gs7viID