wp_ajax_get_post_thumbnail_html() │ WP 4.6.0

Handles retrieving HTML for the featured image via AJAX.

No Hooks.

Returns

null. Nothing (null).

Usage

wp_ajax_get_post_thumbnail_html();

Changelog

Since 4.6.0 Introduced.

wp_ajax_get_post_thumbnail_html() code WP 6.8.3

wp-admin/includes/ajax-actions.php 
function wp_ajax_get_post_thumbnail_html() {
	$post_id = (int) $_POST['post_id'];

	check_ajax_referer( "update-post_$post_id" );

	if ( ! current_user_can( 'edit_post', $post_id ) ) {
		wp_die( -1 );
	}

	$thumbnail_id = (int) $_POST['thumbnail_id'];

	// For backward compatibility, -1 refers to no featured image.
	if ( -1 === $thumbnail_id ) {
		$thumbnail_id = null;
	}

	$return = _wp_post_thumbnail_html( $thumbnail_id, $post_id );
	wp_send_json_success( $return );
}