Welcome to the Treehouse Community

The Treehouse Community is a meeting place for developers, designers, and programmers of all backgrounds and skill levels to get support. Collaborate here on code errors or bugs that you need feedback on, or asking for an extra set of eyes on your latest project. Join thousands of Treehouse students and alumni in the community today. (Note: Only Treehouse students can comment or ask questions, but non-students are welcome to browse our conversations.)

Looking to learn something new?

Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and a supportive community. Start your free trial today.


Why is my code behaving like this?

Hi there. I am trying to do an effect where the menu bar gets carried with the screen as the user scrolls. http://blueprint.pixelblvd.com/

Here is my code:

                    var offset = $('#main-nav').offset();
                      if($(document).scrollTop() < 602){

             <!-- NAVIGATION SCROLLER CODE -->

            <div id="nav_container">
                <nav id="main-nav">
                    <div class="wrap">
                        <a href="/"><div id="logo_mark"></div></a>
                        <div id="nav_link"><a href="#navslide">Menu</a></div>
                        <ul id="navslide">
                            <li><a href="about.php">About</a></li>
                            <li><a href="#">blog</a></li> 
                            <li><a href="services.php">Services</a></li>
                            <li><a href="contact.php">Contact</a></li>              
                            <li><a href="faq.php">FAQ</a></li>

And my CSS:

            #main-nav {
            background: #eeeeee;
            padding: 0;
            height: 4em;
            z-index: 999;
            width: 100%;

            #nav_link {
            display: none;

            #main-nav ul {
            line-height: 4.7em;
            position: absolute;
            right: 0;
            display: inline-block;
            font-size: 1em;
            letter-spacing: .1em;
            font-weight: 100;
            text-align: left;
            text-transform: uppercase;
            vertical-align: top;

            #main-nav ul a {
            color: #333;
            text-decoration: none;
            margin: 0 1em;
            padding-bottom: 5px;

            #main-nav li {
            line-height: 1em;
            display: inline-block;

            #nav_link a {
            display: block;
            text-indent: -999px;

            .fixed-nav {
              width: 100%;
              position: fixed;
              top: 0;
              left: 0;

            .fixed-nav #logo_mark{
                display: inline-block;

            #logo_mark {
            display: none;
            width: 223px;
            height: 36px;
            background-image: url('images/menu.png');
            background-size: 100%;
            margin-left: 25px;
            margin-top: 15px;

I am not sure why when you scroll past 602 pixels it is making that jump?

Thanks for your help

1 Answer

Samuel Wambach
Samuel Wambach
3,606 Points

When the nav becomes fixed, it is removed from the flow of the page, causing that skip. Your nav_container needs to set the height of the nav bar. That way, when the nav bar becomes fixed, the container maintains the height.

Thanks so much! I was pulling my hair out over that!!!