MediaWiki:Vector.js

function loadPage(url) {
  var xhr = new XMLHttpRequest();
  xhr.onreadystatechange = function() {
      if (xhr.readyState === XMLHttpRequest.DONE) {
          if (xhr.status === 200) {
              document.documentElement.innerHTML = xhr.responseText;
              window.history.pushState({}, '', url);
          }
      }
  };
  xhr.open('GET', url, true);
  xhr.send();
}

document.addEventListener('click', function(event) {
  var link = event.target.closest('a');
  if (link && link.href && link.href.indexOf(window.location.origin) !== -1) {
      event.preventDefault();
      loadPage(link.href);
  }
});

window.addEventListener('popstate', function(event) {
  loadPage(window.location.href);
});

function toggleTheme() {
  var isLightTheme = document.documentElement.classList.toggle('light');
  localStorage.setItem("isLightTheme", isLightTheme);
}

$(document).ready(function() {
  var container = document.getElementById("p-personal");
  if (container) {
      var checkbox = document.createElement("input");
      checkbox.type = "checkbox";
      checkbox.id = "theme-toggle";
      
      var label = document.createElement("label");
      label.htmlFor = "theme-toggle";
      label.id = "theme-button";
      
      container.parentNode.insertBefore(checkbox, container);
      container.parentNode.insertBefore(label, container);
  }

  var isLightTheme = localStorage.getItem("isLightTheme");
  if (isLightTheme === "true") {
      document.documentElement.classList.add('light');
  } else {
      document.documentElement.classList.remove('light');
  }

  $("#theme-toggle").change(function() {
      toggleTheme();
  });
});