turbolinks-preserve-focus.js

let lastFocusedId = null;

document.addEventListener("turbolinks:request-start", function () {
  const element = document.querySelector(
    "[data-turbolinks-preserve-focus]:focus"
  );

  if (element) {
    lastFocusedId = element.id;
  }
});

document.addEventListener("turbolinks:load", function () {
  if (!lastFocusedId) return;

  const element = document.getElementById(lastFocusedId);
  lastFocusedId = null;

  if (!element) return;

  element.focus();
});