What is the best way to modify navbar-default to navbar-inverse when scrolling?

On the header of my webpage, the primary navigation class is called: 

navbar navbar-default navbar-fixed-top bg

I am attempting to create a smoother scroll animation by changing the class when scrolling as follows:

navbar navbar-inverse navbar-fixed-top bg

How can I achieve this using Javascript? I haven't been able to find any resources online...the one solution I did come across only allowed for removing one class at a time which doesn't work in my case where multiple classes are used simultaneously...

javascriptjqueryhtmlcsstwitter-bootstrap

Answer №1

Let's illustrate this with a practical example.

To make your navigation bar change background color when you scroll down past a specific point, you can utilize $(window).scroll() and addClass(). Keep in mind that using addClass and removeClass allows you to add or remove individual class names from elements containing multiple classes.

It is important to note that you may need to employ !important to enforce the color change, as bootstrap styles can be quite persistent.

var visible = true;
var win = $(window);
var nav = $('nav');

win.scroll(function(){
    var position = win.scrollTop();
  
    if (visible && position > 100){
        visible = false;
        nav.addClass('bg');
    } else if (!visible && position < 100){
        visible = true;
        nav.removeClass('bg');
    }
});
body,
html {
  height: 2000px;
}
.bg{
    background: green !important;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.0.1/jquery.min.js"></script>
<link href="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/css/bootstrap.min.css" rel="stylesheet" />
<script src="https://maxcdn.bootstrapcdn.com/bootstrap/3.3.6/js/bootstrap.min.js"></script>

<nav class="navbar navbar-inverse navbar-fixed-top">
  <div class="container-fluid">
    <div class="navbar-header">
      <button type="button" class="navbar-toggle" data-toggle="collapse" data-target="#myNavbar">
        <span class="icon-bar"></span>
        <span class="icon-bar"></span>
        <span class="icon-bar"></span> 
      </button>
      <a class="navbar-brand" href="#">WebSiteName</a>
    </div>
    <div class="collapse navbar-collapse" id="myNavbar">
      <ul class="nav navbar-nav">
        <li class="active"><a href="#">Home</a>
        </li>
        <li class="dropdown">
          <a class="dropdown-toggle" data-toggle="dropdown" href="#">Page 1
        <span class="caret"></span></a>
          <ul class="dropdown-menu">
            <li><a href="#">Page 1-1</a>
            </li>
            <li><a href="#">Page 1-2</a>
            </li>
            <li><a href="#">Page 1-3</a>
            </li>
          </ul>
        </li>
        <li><a href="#">Page 2</a>
        </li>
        <li><a href="#">Page 3</a>
        </li>
      </ul>
    </div>
  </div>
</nav>

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