src/filter-dropdown.js
function (e) {
    var self = this;
    if (self.isOpen !== true) {
      self.open(e);
    }
    else {
      self.close(e);
    }
  }
function (e) {
    var self = this;
    if (self.isOpen !== true) {
      self.open(e);
    }
    else {
      self.close(e);
    }
  }
function ( e ) { var self = this ; if ( self . isOpen !== true ) { self . open ( e ) ; } else { self . close ( e ) ; } }
Toggle the dropdown visibility

@method toggle
@param {object} [e]
Toggle the dropdown visibility