code: function updateIsOpen(isOpen) {
        // Support deprecated md-sidenav-focus attribute as fallback
        var focusEl = $mdUtil.findFocusTarget(element) || $mdUtil.findFocusTarget(element,'[md-sidenav-focus]') || element;
        var parent = element.parent();
  
        // If the user hasn't set the disable close events property we are adding
        // click and escape events to close the sidenav
        if ( !disableCloseEvents ) {
          parent[isOpen ? 'on' : 'off']('keydown', onKeyDown);
          if (backdrop) backdrop[isOpen ? 'on' : 'off']('click', close);
        }
  
        var restorePositioning = updateContainerPositions(parent, isOpen);
  
        if ( isOpen ) {
          // Capture upon opening..
          triggeringElement = $document[0].activeElement;
          triggeringInteractionType = $mdInteraction.getLastInteractionType();
        }
  
        disableParentScroll(isOpen);
  
        return promise = $q.all([
          isOpen && backdrop ? $animate.enter(backdrop, parent) : backdrop ?
                               $animate.leave(backdrop) : $q.when(true),
          $animate[isOpen ? 'removeClass' : 'addClass'](element, 'md-closed')
        ]).then(function() {
          // Perform focus when animations are ALL done...
          if (scope.isOpen) {
            $$rAF(function() {
              // Notifies child components that the sidenav was opened. Should wait
              // a frame in order to allow for the element height to be computed.
              ngWindow.triggerHandler('resize');
            });
  
            focusEl && focusEl.focus();
          }
  
          // Restores the positioning on the sidenav and backdrop.
          restorePositioning && restorePositioning();
        });
      }
docs: Toggle the SideNav view and attach/detach listeners
  @param isOpen