$('#page_form').html('<%= j render partial: 'form', locals: { url: url_for_page(@page) } %>');

initSelect2();

KindEditor.create(
  'textarea[class="rich_text"]',
    {
      width: "100%",
      height: 300,
      allowFileManager: true,
      uploadJson: '/kindeditor/upload',
      fileManagerJson: '/kindeditor/filemanager'
    }
);