How Can I Implement Smooth Scrolling for Anchor Links Using JavaScript and jQuery?

Creating Smooth Scrolling for Anchor Links

Smooth scrolling enhances user experience when using anchor links to navigate within a page. This article provides two approaches to achieve this effect: a native method compatible with modern browsers and a jQuery implementation for broader support.

Native Method for Modern Browsers:

document.querySelectorAll('a[href^="#"]').forEach(anchor => {
    anchor.addEventListener('click', (e) => {
        e.preventDefault();

        document.querySelector(this.getAttribute('href')).scrollIntoView({
            behavior: 'smooth'
        });
    });
});

jQuery Method for Older Browsers:

$(document).on('click', 'a[href^="#"]', function (event) {
    event.preventDefault();

    $('html, body').animate({
        scrollTop: $($.attr(this, 'href')).offset().top
    }, 500);
});

Note: For elements without an ID, this variation should be used:

$('a[href^="#"]').click(function () {
    $('html, body').animate({
        scrollTop: $('[name="' + $.attr(this, 'href').substr(1) + '"]').offset().top
    }, 500);

    return false;
});

Performance Optimization:

To improve performance, cache the $('html, body') selector:

var $root = $('html, body');

$('a[href^="#"]').click(function () {
    $root.animate({
        scrollTop: $( $.attr(this, 'href') ).offset().top
    }, 500);

    return false;
});

Updating URL:

For cases where you want the URL to reflect the current section, use this variation:

var $root = $('html, body');

$('a[href^="#"]').click(function() {
    var href = $.attr(this, 'href');

    $root.animate({
        scrollTop: $(href).offset().top
    }, 500, function () {
        window.location.hash = href;
    });

    return false;
});

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