MediaWiki:Common.js

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

    // Save the sidebar scroll position to session storage
    function saveSidebarScrollPosition() {
        var scrollPosition = document.getElementById(sidebarId).scrollTop;
        sessionStorage.setItem('sidebarScrollPosition', scrollPosition);
    }

    // Restore the sidebar scroll position from session storage
    function restoreSidebarScrollPosition() {
        var scrollPosition = sessionStorage.getItem('sidebarScrollPosition');
        if (scrollPosition !== null) {
            document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
        }
    }

    // Save the sidebar scroll position before navigating away
    window.addEventListener('beforeunload', saveSidebarScrollPosition);

    // Restore the sidebar scroll position on page load
    window.addEventListener('DOMContentLoaded', restoreSidebarScrollPosition);

    // Save the sidebar scroll position when clicking on sidebar links
    document.querySelectorAll('#' + sidebarId + ' a').forEach(function (link) {
        link.addEventListener('click', function (event) {
            saveSidebarScrollPosition();
        });
    });
})();