class AjaxBasePageNegotiator

Defines a theme negotiator that deals with the active theme on ajax requests.

Many different pages can invoke an Ajax request to a generic Ajax path. It is almost always desired for an Ajax response to be rendered using the same theme as the base page, because most themes are built with the assumption that they control the entire page, so if the CSS for two themes are both loaded for a given page, they may conflict with each other. For example, Bartik is Drupal's default theme, and Seven is Drupal's default administration theme. Depending on whether the "Use the administration theme when editing or creating content" checkbox is checked, the node edit form may be displayed in either theme, but the Ajax response to the Field module's "Add another item" button should be rendered using the same theme as the rest of the page.

Therefore specify '_theme: ajax_base_page' as part of the router options.

Hierarchy

• class \Drupal\Core\Theme\AjaxBasePageNegotiator implements ThemeNegotiatorInterface

File

core/lib/Drupal/Core/Theme/AjaxBasePageNegotiator.php, line 27

Namespace

Drupal\Core\Theme

Members

Name	Modifiers	Type	Description
AjaxBasePageNegotiator::$configFactory	protected	property	The config factory.
AjaxBasePageNegotiator::$csrfGenerator	protected	property	The CSRF token generator.
AjaxBasePageNegotiator::$requestStack	protected	property	The request stack.
AjaxBasePageNegotiator::applies	public	function	Whether this theme negotiator should be used to set the theme. Overrides ThemeNegotiatorInterface::applies
AjaxBasePageNegotiator::determineActiveTheme	public	function	Determine the active theme for the request. Overrides ThemeNegotiatorInterface::determineActiveTheme
AjaxBasePageNegotiator::__construct	public	function	Constructs a new AjaxBasePageNegotiator.