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media/com_content/js/admin-article-pagebreak.js

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+/**
+ * @copyright  (C) 2018 Open Source Matters, Inc. <https://www.joomla.org>
+ * @license    GNU General Public License version 2 or later; see LICENSE.txt
+ */
+
+(() => {
+
+  window.insertPagebreak = editor => {
+    // Get the pagebreak title
+    let title = document.getElementById('title').value;
+    if (!window.parent.Joomla.getOptions('xtd-pagebreak')) {
+      // Something went wrong!
+      window.parent.Joomla.Modal.getCurrent().close();
+      return false;
+    }
+
+    // Get the pagebreak toc alias -- not inserting for now don't know which attribute to use..
+    let alt = document.getElementById('alt').value;
+    title = title !== '' ? `title="${title}"` : '';
+    alt = alt !== '' ? `alt="${alt}"` : '';
+    const tag = `<hr class="system-pagebreak" ${title} ${alt}>`;
+    window.parent.Joomla.editors.instances[editor].replaceSelection(tag);
+    window.parent.Joomla.Modal.getCurrent().close();
+    return false;
+  };
+})();