169 lines
6.1 KiB
Markdown
169 lines
6.1 KiB
Markdown
---
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title: Navigation Bar
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---
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## Navigation Bar
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The Bootstrap framework provides you with a feature called navigation bars. In short, a navigation bar (also referred to as a navbar) is a header at the top of the page to display navigational information.
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#### How To Use
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To use Bootstrap Navigation Bars you add a `<nav>` element to the top inside the `<body>` element of your webpage. There are various styles you can add to customize the display of your navbars.
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#### Code Example
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This is the code needed to make a basic navbar.
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```html
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<nav class="navbar navbar-default">
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<div class="container-fluid">
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<div class="navbar-header">
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<a class="navbar-brand" href="#">Site Name</a>
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</div>
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<ul class="nav navbar-nav">
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<li class="active"><a href="#">Home</a></li>
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<li><a href="#">Page 1</a></li>
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<li><a href="#">Page 2</a></li>
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<li><a href="#">Page 3</a></li>
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</ul>
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</div>
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</nav>
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```
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#### Navbar Styles
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Bootstrap provides a set of classes in the Bootstrap framework to style your navbars. These classes are as followed:
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* `navbar navbar-default` This is the default style for your navbars.
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* `navbar navbar-inverse` This is similar to the default style except the colors are inverted.
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#### Adding drop-down menus to the navbar
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You can include a drop-down menu inside a navbar. This feature requires you to include Bootstrap's javascript file for it to work.
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```html
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<li class="dropdown">
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<a class="dropdown-toggle" data-toggle="dropdown" href="#">Drop down
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<span class="caret"></span>
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</a>
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<ul class="dropdown-menu">
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<li><a href="#">Item 1</a></li>
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<li><a href="#">Item 2</a></li>
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<li><a href="#">Item 3</a></li>
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</ul>
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</li>
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```
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#### Adding buttons to the navbar
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You can add buttons on the navbar. The existing Bootstrap Button classes work however you'll need to include the class `navbar-btn` to the end of the class list.
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```html
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<button class="btn navbar-btn">Button</button>
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```
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#### Adding forms to the navbar
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You can also add forms to the navbar. This could be uses for tasks such as a search field, quick login field, etc.
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```html
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<form class="navbar-form navbar-right">
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<div class="form-group">
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<input type="text" class="form-control" placeholder="Search">
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</div>
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<button type="submit" class="btn btn-default">Search</button>
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</form>
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```
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#### Aligning elements to the right on the navbar
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In some cases you might want to align elements in a navbar to the right (for example a login or sign-up button.). To do this you'll need to use the `navbar-right` class.
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```html
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<nav class="navbar navbar-default">
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<div class="container-fluid">
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<div class="navbar-header">
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<a class="navbar-brand" href="#">Site Name</a>
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</div>
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<ul class="nav navbar-nav">
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<li class="active"><a href="#">Home</a></li>
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<li><a href="#">Page 1</a></li>
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<li><a href="#">Page 2</a></li>
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<li><a href="#">Page 3</a></li>
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</ul>
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<ul class="nav navbar-nav navbar-right">
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<li><a href="#">Action Link #1</a></li>
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<li><a href="#">Action Link #2</a></li>
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</ul>
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</div>
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</nav>
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```
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#### Displaying the navbar independent of scrolling
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In some cases you might want to keep the navbar at the top or bottom of the screen regardless of scrolling. You will need to add either the `navbar-fixed-top` or `navbar-fixed-bottom` class to the `<nav>` element.
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```html
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<nav class="navbar navbar-default navbar-fixed-top">
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<div class="container-fluid">
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<div class="navbar-header">
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<a class="navbar-brand" href="#">Site Name</a>
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</div>
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<ul class="nav navbar-nav">
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<li class="active"><a href="#">Home</a></li>
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<li><a href="#">Page 1</a></li>
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<li><a href="#">Page 2</a></li>
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<li><a href="#">Page 3</a></li>
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</ul>
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</div>
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</nav>
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```
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#### Collapsing the navbar
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On a small screen (such as a phone or tablet) the navbar is going to take up too much space. Luckily the option to collase the navbar exists. You can accomplish this using the following example.
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```html
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<nav class="navbar navbar-default">
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<div class="container-fluid">
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<div class="navbar-header">
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<a class="navbar-brand" href="#">Site Name</a>
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</div>
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<ul class="nav navbar-nav">
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<li class="active"><a href="#">Home</a></li>
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<li><a href="#">Page 1</a></li>
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<li><a href="#">Page 2</a></li>
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<li><a href="#">Page 3</a></li>
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</ul>
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</div>
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</nav>
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```
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#### Navbar Examples
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<!-- A drop-down cannot be shown in the example unless we include Bootstrap's javascript file. -->
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<!-- The id attributes are set in the example so clicking the links won't go to top of the page. -->
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`navbar navbar-default`
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<nav class="navbar navbar-default" id="navbar-default">
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<div class="container-fluid">
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<div class="navbar-header">
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<a class="navbar-brand" href="#navbar-default">Site Name</a>
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</div>
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<ul class="nav navbar-nav">
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<li class="active"><a href="#navbar-default">Home</a></li>
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<li><a href="#navbar-default">Page 1</a></li>
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<li><a href="#navbar-default">Page 2</a></li>
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<li><a href="#navbar-default">Page 3</a></li>
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<button class="btn navbar-btn">Button</button>
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</ul>
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<ul class="nav navbar-nav navbar-right">
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<li><a href="#navbar-default">Action Link #1</a></li>
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<li><a href="#navbar-default">Action Link #2</a></li>
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</ul>
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</div>
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</nav>
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`navbar navbar-inverse`
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<nav class="navbar navbar-inverse" id="navbar-inverse">
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<div class="container-fluid">
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<div class="navbar-header">
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<a class="navbar-brand" href="#navbar-inverse">Site Name</a>
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</div>
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<ul class="nav navbar-nav">
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<li class="active"><a href="#navbar-inverse">Home</a></li>
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<li><a href="#navbar-inverse">Page 1</a></li>
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<li><a href="#navbar-inverse">Page 2</a></li>
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<li><a href="#navbar-inverse">Page 3</a></li>
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<button class="btn navbar-btn">Button</button>
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</ul>
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<ul class="nav navbar-nav navbar-right">
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<li><a href="#navbar-inverse">Action Link #1</a></li>
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<li><a href="#navbar-inverse">Action Link #2</a></li>
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</ul>
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</div>
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</nav>
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#### More Information:
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[BootStrap navbar documentation](https://getbootstrap.com/docs/4.0/components/navbar/)
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