My bootstrap 4 dropdown doesn't work and I'm not sure how to resolve it - html

I'm very new to HTML and have been struggling to get my dropdown to work for a few hours now. I've searched many posts facing similar issues but I still can't find and resolve the issue. I'm unsure if the issue is caused by my scripts as well
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/css/bootstrap.min.css">
<script src="https://ajax.googleleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.16.0/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.5.2/js/bootstrap.min.js"></script>
<header class="navbar navbar-expand-lg navbar-light bg-light">
<a class="navbar-brand" href="#" id="logo">Logo</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent">
<span class="navbar-toggler-icon"></span>
</button>
<nav class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item"><a class="nav-link active" href="#">Home <span class="sr-only">(current)</span></a></li>
<li class="nav-item"><a class="nav-link" href="#">Link</a></li>
<li class="nav-item">
<div class="dropdown">
Dropdown
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
Action
Another action
<div class="dropdown-divider"></div>
Something else here
</div>
</div>
</li>
<li class="nav-item"><a class="nav-link" href="#">Disabled</a></li>
</ul>
</nav>
</header>
Thanks in advance!
I tried replacing data-toggle="dropdown" with data-bs-toggle="dropdown" but it didn't work since I'm using bootstrap 4, copied and pasted the codes directly from bootstrap and it still failed

The CDN isn't working for your jQuery. Bootstrap needs this to run. You get a clue for this in your console, there should be an error saying that it needed jQuery. So you can:
Replace this
https://ajax.googleleapis.com/ajax/libs/jquery/3.5.1/jquery.min.js
With this
https://code.jquery.com/jquery-3.6.1.min.js

You need to add bootstrap jQuery
use this code snippet for done
HTML Code
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1, shrink-to-fit=no">
<link rel="stylesheet" href="https://cdn.jsdelivr.net/npm/bootstrap#4.5.3/dist/css/bootstrap.min.css">
<title>Hello, world!</title>
</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="#navbarSupportedContent"
aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="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="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#4.5.3/dist/js/bootstrap.bundle.min.js"></script>
</body>
</html>

Related

Navbar dropdown not working in Angular 12 bootstrap 5

I'm trying to use bootstrap with Angular via CDN. This is my index.html file:
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<title>Laboratorio Sigma</title>
<base href="/">
<meta name="viewport" content="width=device-width, initial-scale=1">
<!-- CSS only -->
<link rel="icon" type="image/x-icon" href="favicon.ico">
<link href="https://cdn.jsdelivr.net/npm/bootstrap#5.1.1/dist/css/bootstrap.min.css" rel="stylesheet" integrity="sha384-F3w7mX95PdgyTmZZMECAngseQB83DfGTowi0iMjiWaeVhAn4FJkqJByhZMI3AhiU" crossorigin="anonymous">
</head>
<body>
<app-root></app-root>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#5.1.1/dist/js/bootstrap.bundle.min.js" integrity="sha384-/bQdsTh/da6pkI1MST/rWKFNjaCP5gBSY4sEBT38Q/9RBh9AH40zEOg7Hlq2THRZ" crossorigin="anonymous"></script>
</body>
</html>
I created a navbar component and just tried to use a navbar from the bootstrap page:
<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="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="navbarDropdown" role="button" data-bs-toggle="dropdown" aria-haspopup="true" aria-expanded="false">
Dropdown
</a>
<div class="dropdown-menu" aria-labelledby="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
But first, the navbar has the search bar weirdly position to the left. And more importantly, the dropdown button is not working. I click it, but the list won't show
I've used bootstrap on other angular projects, but never via CDN. I don't know what could possibly be wrong in this one.
I made it work replacing "data-toggle" with "data-bs-toggle". Same with the data target, "data-bs-target"

Bootstrap navbar toggle is not working (expanding)

I am struggling with my navbar that was made out of HTML CSS and Bootstrap. I had followed some tutorials on youtube but I can seem to expand the toggle button when the screen size is reduced to the smallest. Since I'm starting a new project, I applied all of this with HTML CSS, and Bootstrap and opened the HTML file in my local directory. Please help me! I have been stuck for hours.
Below are the codes that I did:
<head>
<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta http-equiv="X-UA-Compatible" content="ie=edge"/>
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<link rel="stylesheet" href="bootstrap.min.css"/>
<link rel="stylesheet" href="title.css" />
<title>Document</title>
</head>
<body>
<nav class="navbar navbar-expand-md navbar-light bg-light sticky-top">
<button class="navbar-toggler" data-toggle="collapse" data-target="#collapse_target">
<span class="navbar-toggler-icon></span>
</button>
<div class="collapse navbar-collapse" id="collapse_target">
<a class="navbar-brand>Logo</a>
<ul class="navbar-nav">
<li class="nav-item">
<a class="nav-link href="#">Link 1</a>
</li>
<li class="nav-item">
<a class="nav-link href="#">Link 2</a>
</li>
<li class="nav-item">
<a class="nav-link href="#">Link 3</a>
</li>
</ul>
</div>
</nav>
</body>
My results are as below:
I will get the toggler icon as above but I will not be able to click it and get 'Home', 'Categories', 'About', and 'Contact'. I don't know where I did wrong.
Thank you for your time.
You missed JS, their CDN is available in getbootstrap.com
I add two responsive navbar in the following. These codes are used from getbootstrap.com
<!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://cdn.jsdelivr.net/npm/bootstrap#4.5.3/dist/css/bootstrap.min.css" integrity="sha384-TX8t27EcRE3e/ihU7zmQxVncDAy5uIKz4rEkgIXeMed4M0jlfIDPvg6uqKI2xXr2" crossorigin="anonymous">
<title>Document</title>
</head>
<body>
<nav class="navbar navbar-expand-sm navbar-dark bg-dark">
<a class="navbar-brand" href="#">Expand at sm</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample03" aria-controls="navbarsExample03" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExample03">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdown03" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<div class="dropdown-menu" aria-labelledby="dropdown03">
<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>
<form class="form-inline my-2 my-md-0">
<input class="form-control" type="text" placeholder="Search">
</form>
</div>
</nav>
<hr class"m-5">
<nav class="navbar navbar-expand-xl navbar-dark bg-dark">
<a class="navbar-brand" href="#">Expand at xl</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExample06" aria-controls="navbarsExample06" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExample06">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#" tabindex="-1" aria-disabled="true">Disabled</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="#" id="dropdown06" data-toggle="dropdown" aria-haspopup="true" aria-expanded="false">Dropdown</a>
<div class="dropdown-menu" aria-labelledby="dropdown06">
<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>
<form class="form-inline my-2 my-md-0">
<input class="form-control" type="text" placeholder="Search">
</form>
</div>
</nav>
<!-- Optional JavaScript; choose one of the two! -->
<!-- Option 1: jQuery and Bootstrap Bundle (includes Popper) -->
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#4.5.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/popper.js#1.16.1/dist/umd/popper.min.js" integrity="sha384-9/reFTGAW83EW2RDu2S0VKaIzap3H66lZH81PoYlFhbGU+6BZp6G7niu735Sk7lN" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#4.5.3/dist/js/bootstrap.min.js" integrity="sha384-w1Q4orYjBQndcko6MimVbzY0tgp4pWB4lZ7lr30WKz0vr/aWKhXdBNmNb5D92v7s" crossorigin="anonymous"></script>
</body>
</html>
Bootstrap requires JavaScript to function properly. You should add the scripts Bootstrap requires. Source: https://getbootstrap.com/docs/4.5/getting-started/introduction/#js
<script src="https://code.jquery.com/jquery-3.5.1.slim.min.js" integrity="sha384-DfXdz2htPH0lsSSs5nCTpuj/zy4C+OGpamoFVy38MVBnE+IbbVYUew+OrCXaRkfj" crossorigin="anonymous"></script>
<script src="https://cdn.jsdelivr.net/npm/bootstrap#4.5.3/dist/js/bootstrap.bundle.min.js" integrity="sha384-ho+j7jyWK8fNQe+A12Hb8AhRq26LrZ/JpcUGGOn+Y7RsweNrtN/tE3MoK7ZeZDyx" crossorigin="anonymous"></script>
It looks like you are missing "type: button" in your button tag as seen below:
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#collapse_target">
Your problem in Javascript. Please add Boostrap JS into your code.
You can run this code to your page.
Example:
<html>
<head>
<meta charset="UTF-8"/>
<meta name="viewport" content="width=device-width, initial-scale=1.0"/>
<meta http-equiv="X-UA-Compatible" content="ie=edge"/>
<script src="https://code.jquery.com/jquery-3.5.1.js"></script>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/css/bootstrap.min.css"/>
<script src="https://cdnjs.cloudflare.com/ajax/libs/popper.js/1.12.3/umd/popper.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0-beta.2/js/bootstrap.min.js"></script>
<title>Document</title>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-light bg-light container">
<a class="navbar-brand" href="#">Boostrap</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<li class="nav-item active">
<a class="nav-link" href="#">Now<span class="sr-only">(current)</span></a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Can</a>
</li>
<li class="nav-item">
<a class="nav-link" href="#">Use</a>
</li>
<li class="nav-item dropdown">
<a class="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="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Donate Me</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Searching</button>
</form>
</div>
</nav>
</body>
</html>

ASP.NET WebForms and Bootstrap 4.1.3 Navbar not working

I'm trying to learn Bootstrap 4 Navbar and getting it to work with a ASP.NET Webform using framework 4.7.2 (Visual Studio 2013). I copied code from Bootstraps own website and place it in the master Page. In the < HEAD > I have:
<meta charset="utf-8" />
<meta name="viewport" content="width=device-width, initial-scale=1" />
<link type="text/css" rel="stylesheet" href="../../CSS/bootstrap.min.css" />
<script type="text/javascript" src="../../JavaScript/jquery-3.3.1.min.js" ></script>
<script type="text/javascript" src="../../JavaScript/bootstrap.min.js" ></script>
<script type="text/javascript" src="../../JavaScript/bootstrap.bundle.min.js" ></script>
<script type="text/javascript" src="../../JavaScript/popper.min.js"></script>
and in the < BODY > I have:
<form id="form1" runat="server">
<div class="container">
<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="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="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="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
</nav>
</div>
<asp:ContentPlaceHolder ID="body_content" runat="server" ></asp:ContentPlaceHolder>
</form>
The page renders fine as per the Bootstrap example but the dropdown doesn't do anything. Yet, if I create a .HTML page and paste the exact same code, it works fine. So i'm wondering why this code wouldn't work in a WebForm?
I'm using the later Bootstrap.JS (4.1.3), Latest jQuery (3.1.1) and the latest popper.js.
Thanks.
I found that the following worked i.e just by single click on the text Dropdown, the menu opens. Using your code, it opened but by clicking the text twice.
I used the following code to test this scenario. Note that bootstrap.bundle.min.js inlcudes popper.js as well as bootstrap.min.js, so there is no need to include these JavaScript files. This may be why its not working as expected.
You can take a look at following documentation for specifics about bootstrap.bundle.min.js: Bootstrap Bundle JavaScript Includes what
<html xmlns="http://www.w3.org/1999/xhtml">
<head runat="server">
<title>BootStrap Navbar</title>
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/css/bootstrap.min.css" integrity="sha384-Gn5384xqQ1aoWXA+058RXPxPg6fy4IWvTNh0E263XmFcJlSAwiGgFAW/dAiS6JXm" crossorigin="anonymous">
<script src="Scripts/jquery-1.10.2.min.js"></script>
<script src="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.3.1/js/bootstrap.bundle.min.js" integrity="sha256-fzFFyH01cBVPYzl16KT40wqjhgPtq6FFUB6ckN2+GGw=" crossorigin="anonymous"></script>
</head>
<body>
<form id="form1" runat="server">
<div class="container">
<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="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="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="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
</div>
</nav>
</div>
</form>
</body>
</html>

bootstrap 4 Dropdown does not work locally

Good day, I have an issue, I have a simple code and I want to run it locally so I create manually the popper.js and jquery (by copying the code in a file and save it as .js) but dropdown that is inside of the navbar does not work, even if I put only the dropdown alone still the problem so here is my code:
<!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">
<title>Pruebas</title>
<link rel="shortcut icon" href="favicon_16.ico"/>
<link rel="bookmark" href="favicon_16.ico"/>
<!-- Bootstrap CSS -->
<link rel="stylesheet" href="dist/css/bootstrap.min.css">
<title>Hello, world!</title>
</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="#navbarSupportedContent" aria-controls="navbarSupportedContent" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarSupportedContent">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item dropdown">
<a class="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="navbarDropdown">
<a class="dropdown-item" href="#">Action</a>
<a class="dropdown-item" href="#">Another action</a>
<div class="dropdown-divider"></div>
<a class="dropdown-item" href="#">Something else here</a>
</div>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="search" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<h1>Hello, world!</h1>
<!-- Optional JavaScript -->
<!-- jQuery first, then Popper.js, then Bootstrap JS -->
<script src="dist/js/jquery-3.3.1.slim.min.js"></script>
<script src="dist/js/popper.min.js"></script>
<script src="dist/js/bootstrap.min.js"></script>
</body>
</html>

Bootstrap navbar doesn't showed up

I'm currently learning how to create a theme for my drupal website, using Bootstrap.
I follow step by step a tutorial, but I can't figure why the navbar doesn't show up properly. Is it related to JQuery ?
Could you help me ? Is my code :
<!doctype html>
<html lang="en">
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Pauvre mais ravi theme</title>
<link rel="stylesheet" type="text/css" href="css/app.css">
</head>
<body>
<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://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/js/bootstrap.min.js"></script>
<link href="https://cdnjs.cloudflare.com/ajax/libs/twitter-bootstrap/4.0.0-beta/css/bootstrap.min.css" rel="stylesheet" />
<nav class="navbar navbar-default">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="http://example.com" 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>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
According to bootstrap's navbar documentation, you should add class navbar-expand-lg to get hamburger button and bg-light to get light gray background color. Your <nav> tag should be like this
<nav class="navbar navbar-expand-lg navbar-light bg-light">
Hope this help :)
You need to include CSS in head tag(before ending ) in you HTML.
Try this code! I dont have your app.css with me. so try to include it in the
Good luck!
<!DOCTYPE html>
<html lang="en">
<head>
<title>Bootstrap Example</title>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<link rel="stylesheet" href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/css/bootstrap.min.css">
<script src="https://ajax.googleapis.com/ajax/libs/jquery/3.2.1/jquery.min.js"></script>
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.7/js/bootstrap.min.js"></script>
</head>
<body>
<nav class="navbar navbar-default">
<a class="navbar-brand" href="#">Navbar</a>
<button class="navbar-toggler" type="button" data-toggle="collapse" data-target="#navbarsExampleDefault" aria-controls="navbarsExampleDefault" aria-expanded="false" aria-label="Toggle navigation">
<span class="navbar-toggler-icon"></span>
</button>
<div class="collapse navbar-collapse" id="navbarsExampleDefault">
<ul class="navbar-nav mr-auto">
<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="#">Link</a>
</li>
<li class="nav-item">
<a class="nav-link disabled" href="#">Disabled</a>
</li>
<li class="nav-item dropdown">
<a class="nav-link dropdown-toggle" href="http://example.com" 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>
</ul>
<form class="form-inline my-2 my-lg-0">
<input class="form-control mr-sm-2" type="text" placeholder="Search" aria-label="Search">
<button class="btn btn-outline-success my-2 my-sm-0" type="submit">Search</button>
</form>
</div>
</nav>
<div class="container">
<h3>Basic Navbar Example</h3>
<p>A navigation bar is a navigation header that is placed at the top of the page.</p>
</div>
</body>
</html>