Function Dropdown

app/src/static/js/react-bootstrap.js:6468–6547

(props, context)

  };

  function Dropdown(props, context) {
    var _this;

    _this = _React$Component.call(this, props, context) || this;

    _this.handleClick = function (event) {
      _this.toggleOpen(event);
    };

    _this.handleKeyDown = function (event) {
      var key = event.key,
          target = event.target; // Second only to https://github.com/twbs/bootstrap/blob/8cfbf6933b8a0146ac3fbc369f19e520bd1ebdac/js/src/dropdown.js#L400
      // in inscrutability

      var isInput = /input|textarea/i.test(target.tagName);

      if (isInput && (key === ' ' || key !== 'Escape' && _this.menu.contains(target))) {
        return;
      }

      _this._lastSourceEvent = event.type;

      switch (key) {
        case 'ArrowUp':
          {
            var next = _this.getNextFocusedChild(target, -1);

            if (next && next.focus) next.focus();
            event.preventDefault();
            return;
          }

        case 'ArrowDown':
          event.preventDefault();

          if (!_this.props.show) {
            _this.toggleOpen(event);
          } else {
            var _next = _this.getNextFocusedChild(target, 1);

            if (_next && _next.focus) _next.focus();
          }

          return;

        case 'Escape':
        case 'Tab':
          _this.props.onToggle(false, event);

          break;

        default:
      }
    };

    _this._focusInDropdown = false;
    _this.menu = null;
    _this.state = {