Method attach

third_party/subscriptions-project/swg.js:8786–8807

* Attaches the Classic 'Subscribe With Google' button. * @param {!Element} button * @param {../api/subscriptions.ButtonOptions|function()} optionsOrCallback * @param {function()=} callback * @return {!Element}

(button, optionsOrCallback, callback)

   * @return {!Element}
   */
  attach(button, optionsOrCallback, callback) {
    const options = this.setupButtonAndGetParams_(
      button,
      AnalyticsEvent.ACTION_SWG_BUTTON_CLICK,
      optionsOrCallback,
      callback
    ).options;

    const theme = options['theme'];
    button.classList.add(`swg-button-${theme}`);
    button.setAttribute('role', 'button');
    if (options['lang']) {
      button.setAttribute('lang', options['lang']);
    }
    button.setAttribute(
      'title',
      msg(SWG_I18N_STRINGS.SUBSCRIPTION_TITLE_LANG_MAP, button) || ''
    );
    this.logSwgEvent_(AnalyticsEvent.IMPRESSION_SWG_BUTTON);

    return button;
  }

  /**
   * Attaches the new subscribe button, for subscription product types.