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media/plg_system_schedulerunner/js/run-schedule.js

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+/**
+ * @copyright   (C) 2021 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license     GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+/**
+ * Makes calls to com_ajax to trigger the Scheduler.
+ *
+ * Used for lazy scheduling of tasks.
+ *
+ * @package  Joomla.Plugins
+ * @subpackage System.ScheduleRunner
+ *
+ * @since    4.1.0
+ */
+if (!window.Joomla) {
+  throw new Error('Joomla API was not properly initialised');
+}
+const initScheduler = () => {
+  const options = Joomla.getOptions('plg_system_schedulerunner');
+  const paths = Joomla.getOptions('system.paths');
+  const interval = (options && options.interval ? parseInt(options.interval, 10) : 300) * 1000;
+  const uri = `${paths ? `${paths.root}/index.php` : window.location.pathname}?option=com_ajax&format=raw&plugin=RunSchedulerLazy&group=system`;
+  setInterval(() => fetch(uri, {
+    method: 'GET'
+  }), interval);
+
+  // Run it at the beginning at least once
+  fetch(uri, {
+    method: 'GET'
+  });
+};
+(document => {
+  document.addEventListener('DOMContentLoaded', () => {
+    initScheduler();
+  });
+})(document);