| expandTrigger | expand current item when click or hover, one of 'click' 'hover' | string | 'click' |
| fieldNames | custom field name for label and value and children | object | `{ label: 'label', value: 'value', children: 'children' }` |
| fieldNames | custom field name for label and value and children (before 3.7.0 it calls `filedNames` which is typo)) | object | `{ label: 'label', value: 'value', children: 'children' }` |
| getPopupContainer | Parent Node which the selector should be rendered to. Default to `body`. When position issues happen, try to modify it into scrollable content and position it relative.[example](https://codepen.io/afc163/pen/zEjNOy?editors=0010) | Function(triggerNode) | () => document.body |
| loadData | To load option lazily, and it cannot work with `showSearch` | `(selectedOptions) => void` | - |
| notFoundContent | Specify content to show when no result matches. | string | 'Not Found' |