WP_Customize_Nav_Menus::filter_wp_nav_menu( string $nav_menu_content, object $args ): string

Prepares wp_nav_menu() calls for partial refresh.

Description

Injects attributes into container element.

Parameters

$nav_menu_contentstringrequired

The HTML content for the navigation menu.

$argsobjectrequired

An object containing wp_nav_menu() arguments.

More Arguments from wp_nav_menu( … $args )

Array of nav menu arguments.

menu int|string|WP_Term
Desired menu. Accepts a menu ID, slug, name, or object.
menu_class string
CSS class to use for the ul element which forms the menu.
Default 'menu'.
menu_id string
The ID that is applied to the ul element which forms the menu.
Default is the menu slug, incremented.
container string
Whether to wrap the ul, and what to wrap it with.
Default 'div'.
container_class string
Class that is applied to the container.
Default ‘menu-{menu slug}-container’.
container_id string
The ID that is applied to the container.
container_aria_label string
The aria-label attribute that is applied to the container when it’s a nav element.
fallback_cb callable|false
If the menu doesn’t exist, a callback function will fire.
Default is 'wp_page_menu'. Set to false for no fallback.
before string
Text before the link markup.
after string
Text after the link markup.
link_before string
Text before the link text.
link_after string
Text after the link text.
echo bool
Whether to echo the menu or return it. Default true.
depth int
How many levels of the hierarchy are to be included.
0 means all. Default 0.
Default 0.
walker object
Instance of a custom walker class.
theme_location string
Theme location to be used. Must be registered with register_nav_menu() in order to be selectable by the user.
items_wrap string
How the list items should be wrapped. Uses printf() format with numbered placeholders. Default is a ul with an id and class.
item_spacing string
Whether to preserve whitespace within the menu’s HTML.
Accepts 'preserve' or 'discard'. Default 'preserve'.

Return

string Nav menu HTML with selective refresh attributes added if partial can be refreshed.

Source

public function filter_wp_nav_menu( $nav_menu_content, $args ) {
	if ( isset( $args->customize_preview_nav_menus_args['can_partial_refresh'] ) && $args->customize_preview_nav_menus_args['can_partial_refresh'] ) {
		$attributes       = sprintf( ' data-customize-partial-id="%s"', esc_attr( 'nav_menu_instance[' . $args->customize_preview_nav_menus_args['args_hmac'] . ']' ) );
		$attributes      .= ' data-customize-partial-type="nav_menu_instance"';
		$attributes      .= sprintf( ' data-customize-partial-placement-context="%s"', esc_attr( wp_json_encode( $args->customize_preview_nav_menus_args ) ) );
		$nav_menu_content = preg_replace( '#^(<\w+)#', '$1 ' . str_replace( '\\', '\\\\', $attributes ), $nav_menu_content, 1 );
	}
	return $nav_menu_content;
}

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Uses	Description
wp_json_encode()`wp-includes/functions.php`	Encodes a variable into JSON, with some confidence checks.
esc_attr()`wp-includes/formatting.php`	Escaping for HTML attributes.

Changelog

Version	Description
4.3.0	Introduced.

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