Bootstrap 4 - Barra de navegación
Descripción
Navbar proporciona encabezados de navegación para su aplicación o sitio. Las barras de navegación se colapsan en las vistas móviles y se vuelven horizontales a medida que aumenta el ancho de la ventana gráfica disponible.
Barra de navegación básica
Para crear una barra de navegación básica, agregue la clase .navbar con la clase de colapso sensible .navbar-expand-xl | lg | md | sm (proporciona barra de navegación en pantallas extra grandes, grandes, medianas o pequeñas). Para agregar enlaces a la barra de navegación, simplemente agregue una lista desordenada con la clase .navbar-nav . Para definir cada elemento de la lista individual, agregue la clase .nav-item al elemento <li> y use la clase .nav-link a un elemento <a> para enlaces individuales.
El siguiente ejemplo demuestra la creación de una barra de navegación básica:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Basic Navbar</h2>
<nav class = "navbar navbar-expand-sm navbar-dark bg-secondary">
<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 = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Logotipo
La marca o el logotipo de la página se pueden resaltar utilizando la clase .navbar-brand como se muestra en el siguiente ejemplo:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Brand</h2>
<nav class = "navbar navbar-expand-sm bg-secondary navbar-dark">
<a class = "navbar-brand" href = "#">Logo</a>
<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 = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</nav>
<br>
<h2>Image Logo</h2>
<nav class = "navbar navbar-expand-sm bg-secondary navbar-dark">
<a class = "navbar-brand" href = "#">
<img src = "https://www.tutorialspoint.com/bootstrap/images/logo.png"
style = "width:120px;" alt = "">
</a>
<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 = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</nav>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Barra de navegación con menú desplegable
Navbar puede tener un menú desplegable agregando el código desplegable al elemento <li> con la ayuda de la clase .dropdown . El siguiente ejemplo demuestra esto:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Navbar With Dropdown</h2>
<nav class = "navbar navbar-expand-sm bg-secondary navbar-dark">
<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 = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
<li class = "nav-item dropdown">
<a class = "nav-link dropdown-toggle" href = "#"
id = "navbarDropdownMenuLink" role = "button" data-toggle = "dropdown"
aria-haspopup = "true" aria-expanded = "false">
Library
</a>
<div class = "dropdown-menu" aria-labelledby = "navbarDropdownMenuLink">
<a class = "dropdown-item" href = "#">HTML-5</a>
<a class = "dropdown-item" href = "#">CSS-3</a>
<a class = "dropdown-item" href = "#">Bootstrap-4</a>
</div>
</li>
</ul>
</div>
</nav>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity =" sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin =" anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Barra de navegación con formularios y botones
Puede crear controles de formulario y botones dentro de la barra de navegación usando la clase de formulario en línea para el elemento <form> como se muestra en el siguiente ejemplo:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Navbar with Form and Button</h2>
<nav class = "navbar navbar-expand-sm bg-secondary navbar-dark">
<form class = "form-inline">
<input class = "form-control mr-sm-2" type = "text" placeholder = "Search your product">
<button class = "btn btn-info" type = "submit">Search</button>
</form>
</nav>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Barras de navegación de colores
Cambie el color del fondo de la barra de navegación utilizando utilidades de color de fondo (.bg- *) como bg-primary , bg-dark, etc. El siguiente ejemplo demuestra esto:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body>
<div class = "container">
<h2>Colored Navbars</h2>
<nav class = "navbar navbar-expand-sm bg-light navbar-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">
<li class = "nav-item active">
<a class =" nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-secondary navbar-light">
<a class = "navbar-brand" href = "#">Secondary 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-dark navbar-light">
<a class = "navbar-brand" href = "#">Dark 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-primary navbar-light">
<a class = "navbar-brand" href = "#">Primary 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-success navbar-light">
<a class = "navbar-brand" href = "#">Success 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-info navbar-light">
<a class = "navbar-brand" href = "#">Info 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-warning navbar-light">
<a class = "navbar-brand" href = "#">Warning 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
<br>
<nav class = "navbar navbar-expand-sm bg-danger navbar-light">
<a class = "navbar-brand" href = "#">Danger 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">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</div>
</nav>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Barra de navegación fija
La barra de navegación Bootstrap puede ser dinámica en su posicionamiento. Puede colocarlo en la parte superior agregando la clase .fixed-top a la clase .navbar . El siguiente ejemplo demuestra esto:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body style = "height:2000px">
<div class = "container">
<nav class = "navbar navbar-expand-sm bg-dark navbar-dark fixed-top">
<a class = "navbar-brand" href = "#">Fixed Top</a>
<ul class = "navbar-nav">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</nav>
<div class = "container-fluid" style = "margin-top:80px">
<h4>This is Fixed Navigation Bar...Scroll this page to see the effect</h4>
</div>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src =" https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl" crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Barra de navegación inferior
Si desea que la barra de navegación se fije en la parte inferior de la página, agregue la clase .fixed-bottom a la clase .navbar . El siguiente ejemplo demuestra esto:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body style = "height:2000px">
<div class = "container">
<nav class = "navbar navbar-expand-sm bg-dark navbar-dark fixed-bottom">
<a class = "navbar-brand" href = "#">Fixed Bottom</a>
<ul class = "navbar-nav">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</nav>
<div class = "container-fluid" style = "margin-top:80px">
<h4>This is Bottom Fixed Navigation Bar...Scroll this page to see the effect</h4>
</div>
</div>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado:
Salida
Barra de navegación fija
Puede hacer que la barra de navegación esté fija en la parte superior de la página, cuando se desplaza por la página, utilizando la clase .sticky-top que se agregará a la clase .navbar . El siguiente ejemplo demuestra esto:
Ejemplo
<html lang = "en">
<head>
<!-- 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://stackpath.bootstrapcdn.com/bootstrap/4.1.3/css/bootstrap.min.css"
integrity = "sha384-MCw98/SFnGE8fJT3GXwEOngsV7Zt27NXFoaoApmYm81iuXoPkFOJwJ8ERdknLPMO"
crossorigin = "anonymous">
<title>Bootstrap 4 Example</title>
</head>
<body style = "height:2000px">
<div class = "container-fluid">
<div class = "container-fluid" style = "margin-top:80px">
<h4>This is Sticky Navigation Bar...Scroll this page to see the effect</h4>
</div>
</div>
<nav class = "navbar navbar-expand-sm bg-dark navbar-dark sticky-top">
<a class = "navbar-brand" href = "#">Sticky Top</a>
<ul class = "navbar-nav">
<li class = "nav-item active">
<a class = "nav-link" href = "#">Home</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">About Us</a>
</li>
<li class = "nav-item">
<a class = "nav-link" href = "#">Contact</a>
</li>
</ul>
</nav>
<!-- jQuery library -->
<script src = "https://code.jquery.com/jquery-3.2.1.slim.min.js"
integrity = "sha384-KJ3o2DKtIkvYIK3UENzmM7KCkRr/rE9/Qpg6aAZGJwFDMVNA/GpGFF93hXpG5KkN"
crossorigin = "anonymous">
</script>
<!-- Popper -->
<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>
<!-- Latest compiled and minified Bootstrap JavaScript -->
<script src = "https://maxcdn.bootstrapcdn.com/bootstrap/4.0.0/js/bootstrap.min.js"
integrity = "sha384-JZR6Spejh4U02d8jOt6vLEHfe/JQGiRRSQQxSfFWpi1MquVdAyjUar5+76PVCmYl"
crossorigin = "anonymous">
</script>
</body>
</html>Producirá el siguiente resultado: