add_filter( 'wpcf7_load_js', '__return_false' );

class WPCF7_Submit_Redirect {
	var $field; //nazov pola, napr. 'your-name'
	var $url; //adresa, na ktoru sa presmeruje
	var $form_id; //ID formularu
	
	function __construct( $field, $url, $form_id = 0 ) {
		$this->field	= $field;
		$this->url	= $url;
		$this->form_id	= $form_id;

		add_action( 'wpcf7_submit', array( $this, 'redirect' ), 10, 2 );
		
		add_shortcode( 'contact-form-7-field', array( $this, 'shortcode' ) );
	}

	public function redirect( $contact_form, $result ) {
		if( $this->form_id && $this->form_id != $contact_form->id() )
			return;

		if ( $result['status'] == 'mail_sent' && isset( $_POST[$this->field] ) ) {
			wp_redirect( add_query_arg( $this->field, $_POST[$this->field], $this->url ) ); 
			exit;
		}
	}	

	public function shortcode() {
		if ( ! empty( $_GET[$this->field] ) )
			return $_GET[$this->field];
	}
}
new WPCF7_Submit_Redirect( 'nazov-pola', 'http://example.com/dakujem', 11378 );