code: function addHandlersForCurrentBtnOnly(btnEl) {
            // handle current button only options via click
            if (cfg.addClassToCurrentBtnOnly) {
              btnEl.on(cfg.CLICK_EVENT, function () {
                btnEl.addClass(cfg.btnLoadingClass);
              });
            }
  
            if (cfg.disableCurrentBtnOnly) {
              btnEl.on(cfg.CLICK_EVENT, function () {
                btnEl.attr('disabled', 'disabled');
              });
            }
          }
docs: Used to limit loading state to show only for the currently
  clicked button.
  @param {Object}btnEl