WordPress at a glance
function is not described

WP_Customize_Nav_Menus::filter_wp_nav_menu() public WP 4.3.0

Prepares wp_nav_menu() calls for partial refresh.

Injects attributes into container element.

{} It's a method of the class: WP_Customize_Nav_Menus{}

No Hooks.

Return

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

Usage

$WP_Customize_Nav_Menus = new WP_Customize_Nav_Menus();
$WP_Customize_Nav_Menus->filter_wp_nav_menu( $nav_menu_content, $args );
$nav_menu_content(string) (required)
The HTML content for the navigation menu.
$args(object) (required)
An object containing wp_nav_menu() arguments.

Notes

  • See: wp_nav_menu()

Changelog

Since 4.3.0 Introduced.

Code of WP_Customize_Nav_Menus::filter_wp_nav_menu() WP 5.7

<?php
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;
}