Modify the Navbar color with a sticky-top effect in Bootstrap 4

Question

Modify the Navbar color with a sticky-top effect in Bootstrap 4

For my sticky navbar, I utilized the Bootstrap 4 class sticky-top. My preference is for a CSS-based solution rather than JavaScript due to past errors encountered with JS.

I aim to have my navbar change to a transparent color when it becomes sticky upon scrolling. However, this transition from a random color to transparency does not work as expected. The grey background from the sticky-top class seems to override the intended effect.

I have attempted adding a new class using JavaScript to address this issue but have not yet found a successful solution.

Here is a Codepen example

javascript jquery html css bootstrap-4

Answer 1

Answer №1

To find out when a sticky element is "stuck," the solution explained here suggests that using position:sticky (Bootstrap's sticky-top) doesn't offer an indication.

Therefore, it is recommended to utilize JavaScript to dynamically change the Navbar color or style. One method involves employing an IntersectionObserver. This can be applied to the #nav-anker element, which precedes the sticky-top Navbar.

(new IntersectionObserver(function(e,o){
    if (e[0].intersectionRatio > 0){
        document.documentElement.removeAttribute('class');
    } else {
        document.documentElement.setAttribute('class','stuck');
    };
})).observe(document.querySelector('#nav-anker'));

As a result, once the Navbar becomes sticky, the stuck class is assigned to it, allowing for CSS styles adjustments when it's in this state...

/* Add styles for sticky state */
.stuck .sticky-top {
    background: #000;
}

Check out the demo here:

Answer 2

To find out when a sticky element is "stuck," the solution explained here suggests that using position:sticky (Bootstrap's sticky-top) doesn't offer an indication.

Therefore, it is recommended to utilize JavaScript to dynamically change the Navbar color or style. One method involves employing an IntersectionObserver. This can be applied to the #nav-anker element, which precedes the sticky-top Navbar.

(new IntersectionObserver(function(e,o){
    if (e[0].intersectionRatio > 0){
        document.documentElement.removeAttribute('class');
    } else {
        document.documentElement.setAttribute('class','stuck');
    };
})).observe(document.querySelector('#nav-anker'));

As a result, once the Navbar becomes sticky, the stuck class is assigned to it, allowing for CSS styles adjustments when it's in this state...

/* Add styles for sticky state */
.stuck .sticky-top {
    background: #000;
}

Check out the demo here:

Answer 3

Answer №2

When adjusting the color of all "nav" styles, you have the option to directly override them. Although using "!important" is usually discouraged, it can be effective in this case.

Another approach is to set up the style for all parent elements leading up to the navigation bar ancestor or assign an ID to the navigation bar.

UPDATE: An alternative method is to dynamically change the opacity based on an element's offset from the top (where 0 indicates stickiness). Lower the opacity at 0 and revert it back to 1 above 0.

//Scrolling is enabled only where the class smooth-scroll is used $(document).ready(function () { $('a.smooth-scroll[href*="#"]:not([href="#three"])').click(function () { if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') && location.hostname == this.hostname) { var target = $(this.hash); //Uncomment the line below if you want the anchor to appear in the URL //target = target.length ? target : $('[name=' + this.hash.slice(1) + ']'); if (target.length) { $('html, body').animate({ scrollTop: target.offset().top }, 1000); return false; } }); //Change opacity when nav is at the top of the page var distance = $('nav').offset().top, $window = $(window); $window.scroll(function() { if ($window.scrollTop() >= distance) { $('nav').fadeTo(0.5, 0.2); } else { $('nav').fadeTo(0.5, 1); } }); }); /* Smooth scroll END */

Answer 4

When adjusting the color of all "nav" styles, you have the option to directly override them. Although using "!important" is usually discouraged, it can be effective in this case.

Another approach is to set up the style for all parent elements leading up to the navigation bar ancestor or assign an ID to the navigation bar.

UPDATE: An alternative method is to dynamically change the opacity based on an element's offset from the top (where 0 indicates stickiness). Lower the opacity at 0 and revert it back to 1 above 0.

//Scrolling is enabled only where the class smooth-scroll is used $(document).ready(function () { $('a.smooth-scroll[href*="#"]:not([href="#three"])').click(function () { if (location.pathname.replace(/^\//, '') == this.pathname.replace(/^\//, '') && location.hostname == this.hostname) { var target = $(this.hash); //Uncomment the line below if you want the anchor to appear in the URL //target = target.length ? target : $('[name=' + this.hash.slice(1) + ']'); if (target.length) { $('html, body').animate({ scrollTop: target.offset().top }, 1000); return false; } }); //Change opacity when nav is at the top of the page var distance = $('nav').offset().top, $window = $(window); $window.scroll(function() { if ($window.scrollTop() >= distance) { $('nav').fadeTo(0.5, 0.2); } else { $('nav').fadeTo(0.5, 1); } }); }); /* Smooth scroll END */

Modify the Navbar color with a sticky-top effect in Bootstrap 4

Answer №1

Answer №2

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