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| (function () {
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| var sidebarId = 'mw-navigation';
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| // Save the sidebar scroll position to URL parameter
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| function saveSidebarScrollPosition() {
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| var scrollPosition = document.getElementById(sidebarId).scrollTop;
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| var newUrl = updateUrlParameter(window.location.href, 'sidebarScroll', scrollPosition);
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| window.history.replaceState(null, '', newUrl);
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| }
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|
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| // Restore the sidebar scroll position from URL parameter
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| function restoreSidebarScrollPosition() {
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| var scrollPosition = getUrlParameter('sidebarScroll');
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| if (scrollPosition !== null) {
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| document.getElementById(sidebarId).scrollTop = parseInt(scrollPosition);
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| }
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| }
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|
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| // Update URL parameter
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| function updateUrlParameter(uri, key, value) {
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| var re = new RegExp("([?&])" + key + "=.*?(&|$)", "i");
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| var separator = uri.indexOf('?') !== -1 ? "&" : "?";
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| if (uri.match(re)) {
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| return uri.replace(re, '$1' + key + "=" + value + '$2');
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| } else {
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| return uri + separator + key + "=" + value;
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| }
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| }
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|
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| // Get URL parameter
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| function getUrlParameter(name) {
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| name = name.replace(/[\[]/, '\\[').replace(/[\]]/, '\\]');
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| var regex = new RegExp('[\\?&]' + name + '=([^&#]*)');
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| var results = regex.exec(location.search);
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| return results === null ? null : decodeURIComponent(results[1].replace(/\+/g, ' '));
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| }
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|
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| // Save the sidebar scroll position before navigating away
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| window.addEventListener('beforeunload', saveSidebarScrollPosition);
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|
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| // Restore the sidebar scroll position on page load
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| window.addEventListener('DOMContentLoaded', restoreSidebarScrollPosition);
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|
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| // Save the sidebar scroll position when clicking on sidebar links
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| document.querySelectorAll('#' + sidebarId + ' a').forEach(function (link) {
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| link.addEventListener('click', function (event) {
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| saveSidebarScrollPosition();
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| });
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| });
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| })();
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