language_switcher_popup.module

<?php

/**
 * @file
 * Language Switcher Popup module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\Core\Url;

/**
 * Implements hook_help().
 */
function language_switcher_popup_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    case "help.page.language_switcher_popup":
      $output = "<h3>" . t("About") . "</h3>";
      $output .= "<p>" . t("Shows a confirmation popup that search filters will be reset when users switch languages") . "</p>";
      $output .= "<h3>" . t("Configuration") . "</h3>";
      $output .= "<p>" . t('Configure the popup messages at <a href=":config">Language Switcher Popup Settings</a>.', [
        ":config" => Url::fromRoute("language_switcher_popup.settings")->toString(),
      ]) . "</p>";
      return $output;
  }
}

/**
 * Implements hook_page_attachments().
 */
function language_switcher_popup_page_attachments(array &$attachments) {
  // Attach the library to all pages.
  $attachments["#attached"]["library"][] = "language_switcher_popup/language_switcher_popup";

  // Pass configuration to JavaScript.
  $config = \Drupal::config("language_switcher_popup.settings");
  $language_manager = \Drupal::languageManager();
  $languages = $language_manager->getLanguages();

  // 1. Get the default site language code
  $default_langcode = $language_manager->getDefaultLanguage()->getId();

  $settings = [
    "enabled" => (bool) ($config->get("enable_popup") ?? TRUE),
    "defaultLanguage" => $default_langcode,
  ];

  foreach ($languages as $langcode => $language) {
    $settings[$langcode] = [
      "message" => $config->get("message_{$langcode}") ?: t("Switching languages will reset your search filters. Do you want to continue?"),
      "confirm" => $config->get("confirm_{$langcode}") ?: t("Continue"),
      "cancel" => $config->get("cancel_{$langcode}") ?: t("Cancel"),
    ];
  }

  $attachments["#attached"]["drupalSettings"]["languageSwitcherPopup"] = $settings;
}