fix: children获取不到，undefined报错 (#260)

* fix(清空选项时动态修改options): 导致children获取不到，undefined报错

* fix(清空选项时动态修改options): 添加测试用例

* fix(清空选项时动态修改options): 修改测试用例

* fix(清空选项时动态修改options): 修改测试用例，bug与异步加载数据无关。

Co-authored-by: yanchanglu <[email protected]>

Author: myGitZone

src/OptionList/useKeyboard.ts

@@ -26,7 +26,7 @@ export default (
     const len = activeValueCells.length;
 
     // Fill validate active value cells and index
-    for (let i = 0; i < len; i += 1) {
+    for (let i = 0; i < len && currentOptions; i += 1) {
       // Mark the active index for current options
       const nextActiveIndex = currentOptions.findIndex(
         option => option[fieldNames.value] === activeValueCells[i],

tests/selector.spec.tsx

@@ -1,6 +1,7 @@
 import React from 'react';
 import { mount } from './enzyme';
 import Cascader from '../src';
+import { addressOptions } from './demoOptions';
 
 describe('Cascader.Selector', () => {
   describe('clear all', () => {
@@ -32,4 +33,22 @@ describe('Cascader.Selector', () => {
     wrapper.find('.rc-cascader-selection-item-remove-icon').first().simulate('click');
     expect(onChange).toHaveBeenCalledWith([['exist']], expect.anything());
   });
+
+  it('when selected modify options', () => {
+    const wrapper = mount(<Cascader options={addressOptions} open />);
+
+    // First column click
+    wrapper.find('.rc-cascader-menu-item-content').first().simulate('click');
+    wrapper.update();
+
+    // Second column click
+    wrapper.find('.rc-cascader-menu-item-content').last().simulate('click');
+    wrapper.update();
+
+    wrapper.setProps({
+      options: [{ label: '福建', value: 'fj', isLeaf: false }],
+    });
+
+    wrapper.update();
+  });
 });