WP_Customize_Upload_Control::to_json() WordPress Method

	public function to_json() {
		parent::to_json();

		$value = $this->value();
		if ( $value ) {
			// Get the attachment model for the existing file.
			$attachment_id = attachment_url_to_postid( $value );
			if ( $attachment_id ) {
				$this->json['attachment'] = wp_prepare_attachment_for_js( $attachment_id );
			}
		}
	}
Uses	Description
wp-includes/customize/class-wp-customize-media-control.php:WP_Customize_Media_Control::to_json()	Refresh the parameters passed to the JavaScript via JSON.
wp-includes/media.php:attachment_url_to_postid()	Tries to convert an attachment URL into a post ID.
wp-includes/media.php:wp_prepare_attachment_for_js()	Prepares an attachment post object for JS, where it is expected to be JSON-encoded and fit into an Attachment model.