MediaWiki:Common.js

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(function () {
    var sidebarId = 'mw-navigation';

    // Save the scroll position before the page unloads
    window.addEventListener('beforeunload', function () {
        localStorage.setItem('sidebarScrollPosition', document.getElementById(sidebarId).scrollTop);
    });

    // Restore the scroll position after the new page loads
    window.addEventListener('DOMContentLoaded', function () {
        var scrollPosition = localStorage.getItem('sidebarScrollPosition');
        if (scrollPosition !== null) {
            document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
        }
    });

    // Save the scroll position when clicking on sidebar links
    document.querySelectorAll('#' + sidebarId + ' a').forEach(function (link) {
        link.addEventListener('click', function () {
            var scrollPosition = document.getElementById(sidebarId).scrollTop;
            localStorage.setItem('sidebarScrollPosition', scrollPosition);
        });
    });
})();