How to make a dropdown list in bootstrap? - html

Question

I am trying to make a bootstrap navbar with dropdown, but I can't figure out why my dropdown doesn't work.
<nav class="navbar sticky-top navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="#"><img class= "logo" src="LogoRegionalPost.png" width="140" height="30" class="d-inline-block align-top" alt=""></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<div class="navbar-nav">
<a class="nav-item nav-link" href="index.html">Acasa<span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">Politica</a>
<a class="nav-item nav-link" href="#">Administratie</a>
<a class="nav-item nav-link" href="#">Economie</a>
<a class="nav-item dropdown nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">Action 1</a>
<a class="dropdown-item" href="#">Action 2</a>
<a class="dropdown-item" href="#">Action 3</a>
</div></div>
</div>
</div>
</nav>

Answer 1

the bootstrap dropdown needs the corresponding javascript-file.
Dropdowns are built on a third party library, Popper.js, which provides dynamic positioning and viewport detection. Be sure to include popper.min.js before Bootstrap’s JavaScript or use bootstrap.bundle.min.js / bootstrap.bundle.js which contains Popper.js. Popper.js isn’t used to position dropdowns in navbars though as dynamic positioning isn’t required. Source
maybe you forgot to add the bootstrap.js ?

Answer 2

Please don't forget to add the bootstrap js dependencies :
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/css/bootstrap.min.css" integrity="sha384-Vkoo8x4CGsO3+Hhxv8T/Q5PaXtkKtu6ug5TOeNV6gBiFeWPGFN9MuhOf23Q9Ifjh" crossorigin="anonymous">
<nav class="navbar sticky-top navbar-expand-lg navbar-dark bg-dark">
<a class="navbar-brand" href="#"><img class="logo" src="LogoRegionalPost.png" width="140" height="30" class="d-inline-block align-top" alt=""></a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarNavAltMarkup" aria-controls="navbarNavAltMarkup" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarNavAltMarkup">
<div class="navbar-nav">
<a class="nav-item nav-link" href="index.html">Acasa<span class="sr-only">(current)</span></a>
<a class="nav-item nav-link" href="#">Politica</a>
<a class="nav-item nav-link" href="#">Administratie</a>
<a class="nav-item nav-link" href="#">Economie</a>
<a class="nav-item dropdown nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdownMenuLink">
<a class="dropdown-item" href="#">Action 1</a>
<a class="dropdown-item" href="#">Action 2</a>
<a class="dropdown-item" href="#">Action 3</a>
</div>
</div>
</div>
</nav>
<!-- ADD BOOTSTRAP JS FILES -->
<script src="https://code.jquery.com/jquery-3.4.1.slim.min.js" integrity="sha384-J6qa4849blE2+poT4WnyKhv5vZF5SrPo0iEjwBvKU7imGFAV0wwj1yYfoRSJoZ+n" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js#1.16.0/dist/umd/popper.min.js" integrity="sha384-Q6E9RHvbIyZFJoft+2mJbHaEWldlvI9IOYy5n3zV9zzTtmI3UksdQRVvoxMfooAo" crossorigin="anonymous"></script>
<script src="https://stackpath.bootstrapcdn.com/bootstrap/4.4.1/js/bootstrap.min.js" integrity="sha384-wfSDF2E50Y2D1uUdj0O3uMBJnjuUD4Ih7YwaYd1iqfktj0Uod8GCExl3Og8ifwB6" crossorigin="anonymous"></script>
You will find this files here.