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javascript - Why are dropdowns and burger menus in Bootstrap 5.0.1 not opening anywhere?

I've recently started building a WordPress template using Bootstrap (I downloaded Bootstrap and link it directly through my website files.) Everything works, except for elements that require JavaScript, such as dropdowns. However, I have properly enqueued bootstrap.bundle.min.js in my functions.php page. I have also included Jquery, and I made sure the two are in the right order (Jquery being enqueued first.) But dropdowns and burger menus still will not open or work. They only display like so: dropdown displayed (when you click on it, nothing happens)

I tried moving things around, using different browsers, enqueueing other scripts like bootstrap.js and bootstrap.min.js (never together, always one at a time), and nothing makes dropdowns work on any device or any browser.

I tried every solution in this similar Stack Overflow question: Twitter Bootstrap dropdown not working in any browser . Still nothing.

The code I use for my dropdown is literally copy-pasted from the Bootstrap documentation (I added the<link> and the<script> so it works in the example snippet. I use my functions.php page to enqueue scripts and stylesheets):

<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>

<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
    Dropdown button
  </button>
  <div class="dropdown-menu" aria-labelledby="dropdownMenuButton">
    <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>
</div>Copy code

Undefined asked

2021-09-2

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512

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Answer

Solution:

It looks like you may have been using the docs for Bootstrap <v4.6.x. In v5.0 the dropdown-menu class is a list <ul> that uses <li> elements to wrap the dropdown links. Here it is using the sample from v5.0 docs:

<script src="https://cdn.jsdelivr.net/npm/[email protected]/dist/js/bootstrap.bundle.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/jquery/3.3.1/jquery.min.js"></script>
<link href="https://cdn.jsdelivr.net/npm/[email protected]/dist/css/bootstrap.min.css" rel="stylesheet"/>
<div class="dropdown">
  <button class="btn btn-secondary dropdown-toggle" type="button" id="dropdownMenuButton1" data-bs-toggle="dropdown" aria-expanded="false">
    Dropdown button
  </button>
  <ul class="dropdown-menu" aria-labelledby="dropdownMenuButton1">
    <li><a class="dropdown-item" href="#">Action</a></li>
    <li><a class="dropdown-item" href="#">Another action</a></li>
    <li><a class="dropdown-item" href="#">Something else here</a></li>
  </ul>
</div>Copy code

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Date the issue was resolved:

2021-09-2

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PHP

PHP (from the English Hypertext Preprocessor - hypertext preprocessor) is a scripting programming language for developing web applications. Supported by most hosting providers, it is one of the most popular tools for creating dynamic websites. The PHP scripting language has gained wide popularity due to its processing speed, simplicity, cross-platform, functionality and distribution of source codes under its own license.
https://www.php.net/

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JavaScript is a multi-paradigm language that supports event-driven, functional, and mandatory (including object-oriented and prototype-based) programming types. Originally JavaScript was only used on the client side. JavaScript is now still used as a server-side programming language. To summarize, we can say that JavaScript is the language of the Internet.
https://www.javascript.com/

JQuery

JQuery is arguably the most popular JavaScript library with so many features for modern development. JQuery is a fast and concise JavaScript library created by John Resig in 2006. It is a cross-platform JavaScript library designed to simplify client-side HTML scripting. Over 19 million websites are currently using jQuery! Companies like WordPress, Facebook, Google, IBM and many more rely on jQuery to provide a kind of web browsing experience.
https://jquery.com/

CSS

CSS (Cascading Style Sheets) is a formal language for describing the appearance of a document written using a markup language. It is mainly used as a means of describing, decorating the appearance of web pages written using HTML and XHTML markup languages, but can also be applied to any XML documents, such as SVG or XUL.
https://www.w3.org/TR/CSS/#css

Bootstrap

Bootstrap is not exclusively a CSS framework, but its most popular features are CSS-centric. These include a powerful grid, icons, buttons, map components, navigation bars, and more.
https://getbootstrap.com/

HTML

HTML (English "hyper text markup language" - hypertext markup language) is a special markup language that is used to create sites on the Internet. Browsers understand html perfectly and can interpret it in an understandable way. In general, any page on the site is html-code, which the browser translates into a user-friendly form. By the way, the code of any page is available to everyone.
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