Fixed navbar at the top changes from absolute positioning to relative when scrolling

My goal is to dynamically change the position of the navbar from fixed to absolute as the user scrolls past 600px. Initially, I used the following code:


if (scroll >= 700) {
    $(".navbar-fixed-top").addClass("navbar-scroll");
} else {
    $(".navbar-fixed-top").removeClass("navbar-scroll");
}

This approach worked successfully, but I wanted to add animation for a smoother transition.

I then attempted the following code:


if (scroll >= 700) {
    $(".navbar-fixed-top").animate({
        position: 'fixed'
    }, "slow"); 
} else {
    $(".navbar-fixed-top").animate({
        position: 'absolute'
    }, "slow");
}

Unfortunately, this updated code did not work as expected. Can anyone provide insight into why it may not be functioning properly?

Answer №1

According to the JQUERY API DOCS, animating the css property position is not possible.

The JQUERY API DOC states that all animated properties should be animated to a single numeric value, with some exceptions. It mentions that certain non-numeric properties cannot be animated using basic jQuery functionality (For example, width, height, or left can be animated but background-color cannot, unless the jQuery.Color() plugin is used). Property values are considered as a number of pixels by default, unless specified otherwise. The units em and % can be used where applicable.

http://api.jquery.com/animate/

Answer №2

Instead of trying to animate the position property, consider using absolute positioning and animating the top value instead.

Check out a Working Example Here

$(window).scroll(function () {
    var scroll = $(window).scrollTop();
    if (scroll >= 700) {
        $(".navbar-fixed-top").animate({
            top: scroll + 10
        }, 50);
    } else {
        $(".navbar-fixed-top").animate({
            top: '10px'
        }, 50);
    }
});

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