[javascript] Bootstrap 4 Dropdown Menu not working?

I copied the official Bootstrap 4 example for dropdown menus but it is not working, that is nothing is dropped down.

<li class="nav-item dropdown">
    <a class="nav-link dropdown-toggle" href="#" id="dropdown01" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
    <div class="dropdown-menu" aria-labelledby="dropdown01">
    <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>

This question is related to javascript css html bootstrap-4

The answer is


Edit: In case anyone else is having this problem, I believe the solution for OP was that he had not imported popper.js.

Check that jQuery and all the relevant Bootstrap components are there. Also check the console and make sure there are no errors.

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<!DOCTYPE html>
<html lang="en">
<head>
  <!-- Required meta tags -->
  <meta charset="utf-8">
  <meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">

  <!-- Bootstrap CSS -->
  <link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/css/bootstrap.min.css" integrity="sha384-/Y6pD6FV/Vv2HJnA6t+vslU6fwYXjCFtcEpHbNJ0lyAFsXTsjBbfaDjzALeQsN6M" crossorigin="anonymous">
</head>
<body>
  <nav class="navbar navbar-expand-lg navbar-light bg-light">
    <a class="navbar-brand" href="#">Navbar</a>
      <button class="navbar-toggler" 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>
    <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>

  <!-- Optional JavaScript -->
  <!-- jQuery first, then Popper.js, then Bootstrap JS -->
  <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/1.11.0/umd/popper.min.js" integrity="sha384-b/U6ypiBEHpOf/4+1nzFpr53nxSS+GLCkfwBdFNTxtclqqenISfwAzpKaMNFNmj4" crossorigin="anonymous"></script>
<-- Always remember to call the above files first before calling the bootstrap.min.js file -->
  <script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta/js/bootstrap.min.js" integrity="sha384-h0AbiXch4ZDo7tp9hKZ4TsHbi047NrKGLO3SEJAg45jXxnGIfYzk4Si90RDIqNm1" crossorigin="anonymous"></script>
</body>
</html>
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It's an issue with popper.js file. What I found at the official site was that bundle files include popper in itself but not jquery. I managed to fix it by adding link to these files:

bootstrap.bundle.js
bootstrap.bundle.min.js

I removed popper.js however since it comes within the bundle file.


I used NuGet to install BootStrap 4. I was also having issues with it not displaying the Dropdown on click. It kept throwing an error in jquery base on what the Chrome console was telling me.

I originally had the following

<%-- CSS --%>
<link type="text/css" rel="stylesheet" href="/Content/bootstrap.css" />

 <%-- JS --%>
<script type="text/javascript" src="/Scripts/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="/Scripts/bootstrap.min.js"></script>

But I changed it to use the bundled version instead and it started to work

<%-- CSS --%>
<link type="text/css" rel="stylesheet" href="/Content/bootstrap.css" />

<%-- JS --%>
<script type="text/javascript" src="/Scripts/jquery-3.3.1.min.js"></script>
<script type="text/javascript" src="/Scripts/bootstrap.bundle.min.js"></script>

try to add these lines at the end of the file

<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/1.12.9/umd/popper.min.js" integrity="sha384-ApNbgh9B+Y1QKtv3Rn7W3mgPxhU9K/ScQsAP7hUibX39j7fakFPskvXusvfa0b4Q" crossorigin="anonymous"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js" integrity="sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin="anonymous"></script>
</body>
</html>

A simple answer is to replace this line:

<script type="text/javascript" src="your_directory/bootstrap.min.js"></script>

for this other:

<script type="text/javascript" src="your_directory/bootstrap.bundle.min.js"></script>

This is my solution

I just downloaded jquery's latest version from their official website and then added it as a js file in my project folder and then to my HTML file. After that it was working fine for me


Make sure to include the Bootstrap CSS either via the Bootstrap CDN or download it and link it locally


You need to enqueue the script bootstrap.js or bootstrap.min.js. I had the same problem with bootstrap 4.5.3 and the menu worked when I enqueued one of the above scripts. It can be either.


Add this code to your jquery

  $('.dropdown').click(function(){

       $('.dropdown-menu').toggleClass('show');

   });

include them with this order this will work i dont know why :D

<!-- jQuery -->
<script src="js/jquery-3.4.1.min.js"></script>

<!-- Popper -->
<script src="js/popper.min.js"></script>

<!-- Bootstrap js -->
<script src="js/bootstrap.min.js"></script>

Via JavaScript Call the dropdowns via JavaScript:

Paste this is code after bootstrap.min.js

$('.dropdown-toggle').dropdown();

Also, make sure you include popper.min.js before bootstrap.min.js

Dropdowns are positioned thanks to Popper.js (except when they are contained in a navbar).


It needs to be /bootstrap.js, not /bootstrap.min.js.


Assuming Bootstrap and Popper libraries were installed using Nuget package manager, for a web application using Visual Studio, in the Master page file (Site.Master), right below where body tag begins, include the reference to popper.min.js by typing:

<script src="Scripts/umd/popper.min.js"></script>

Here is an image to better display the location:

enter image description here

Notice the reference of the popper library to be added should be the one inside umd folder and not the one outside on Scripts folder.

This should fix the problem.


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