Implement jQuery to animate the navigation bar as you scroll

Is there a way to use jQuery for animating the navigation bar, making it change color as you scroll? I am looking to create a navigation bar that has a background-color of rgba(51, 51, 51, 0.3) when at the top of the page, and rgba(255, 255, 255, 1) when scrolled 600 pixels down.

I am aware that this can be achieved with code like:

$(window).bind('scroll', function() {
     if ($(window).scrollTop() > 600) {
         $('.navbar-container-fixed').addClass('white');
     }
     else if ($(window).scrollTop() < 600) {
        $('.navbar-container-fixed').removeClass('white');
     }
});

However, this method changes the color abruptly without any animation. My intention is to have a gradual color transition, where the background color slowly evolves to white as the user scrolls down the page. For example:

0 px from top: rgba(51, 51, 51, 0.3)

100px from top: rgba(85, 85, 85, 0.4167)

200px from top: rgba(119, 119, 119, 5.334)

and so forth.

jqueryhtmlcssanimationjquery-animate

Answer №1

Have you thought about determining the maximum scrolling height and adjusting the color based on the scroll position?

$(window).bind('scroll', function() {
    var col_var = Math.round((255/$("body")[0].scrollHeight)*$(window).scrollTop());
    $(".navbar-container-fixed").css({
        "background-color":"rgb("+col_var+","+col_var+","+col_var+")"
    });

});
.navbar-container-fixed{
    display:block;
    width:50px;
    height:2000px;
    background:black;
}
<script src="https://ajax.googleapis.com/ajax/libs/jquery/2.1.1/jquery.min.js"></script>
<div class="navbar-container-fixed"></div>

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