What is the best way to synchronize the scrolling of a container element with scrollspy?

Question

What is the best way to synchronize the scrolling of a container element with scrollspy?

In my layout, I have multiple sections with a scrollbar that displays buttons using scrollspy. Everything is working perfectly except for one issue - when scrolling too far down, the scrollspy disappears off the page to the right. Is there a way to adjust the scrollbar so that it moves in the direction of the active scrollspy button (the active button receives a class active automatically)?

It's important to note that I am not utilizing jQuery in this project.

Below is the code snippet:

window.setInterval(function(){
  window.onload = function () {
        document.getElementsByClassName('navbar')[0].scrollLeft = 0;
        var menus = document.getElementsByClassName('nav-link');
        for (var i = 0; i < menus.length; i++) {
            if (menus[i].classList.contains('active')) {
                document.getElementsByClassName('navbar')[0].scrollLeft = menus[i].offsetLeft;
            }
        }
    }
}, 1);

Thank you for your assistance!

javascript html css bootstrap-5

Answer 1

Answer №1

To enable smooth scrolling of the navbar to the active scrollspy button, you can create a scroll event listener with a function. Additionally, adding scroll-behavior: smooth in the navbar CSS will prevent sudden scrolling.

const nav = document.querySelector('nav');
const h = document.documentElement;

document.addEventListener('scroll', function() {
  nav.scrollTo(nav.querySelector('.active').offsetLeft, 0);
});

<!doctype html>
<html>
...
  <script>
    var scrollSpy = new bootstrap.ScrollSpy(document.body, {
      target: '#navbar-example'
    })
  </script>
</body>

</html>

Answer 2

To enable smooth scrolling of the navbar to the active scrollspy button, you can create a scroll event listener with a function. Additionally, adding scroll-behavior: smooth in the navbar CSS will prevent sudden scrolling.

const nav = document.querySelector('nav');
const h = document.documentElement;

document.addEventListener('scroll', function() {
  nav.scrollTo(nav.querySelector('.active').offsetLeft, 0);
});

<!doctype html>
<html>
...
  <script>
    var scrollSpy = new bootstrap.ScrollSpy(document.body, {
      target: '#navbar-example'
    })
  </script>
</body>

</html>

What is the best way to synchronize the scrolling of a container element with scrollspy?

Answer №1

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