nozzy

var BackButton = WebApp.BackButton;
BackButton.show();
BackButton.onClick(function() {
    WebApp.showAlert("BackButton clicked");
    BackButton.hide();
});
WebApp.onEvent('backButtonClicked', function() {
    ...
});

add_action('wp_ajax_wpcf7_rescanned_form', 'wpcf7_rescanned_form');
add_action('wp_ajax_nopriv_wpcf7_rescanned_form', 'wpcf7_rescanned_form');

function wpcf7_rescanned_form() {
  update_option( 'my_option', 'my_value' );
}

add_filter( 'wpcf7_before_send_mail', 'fl_wpcf7_before_send_mail_function' ); 
function fl_wpcf7_before_send_mail_function( $contact_form ) {
  $my_value = get_option( 'my_option' );
}