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* docs: add general components TS demo * docs: add layout components TS demo * docs: add navigation components TS demo * docs: add data entry components TS demo * chore(deps): add types for qs * docs: add data display TS demo * docs: add feedback components TS demo * docs: add other components TS demo * chore(deps): add types * docs: unified demo code style * docs: fix lint error * docs: add demo TS type * docs: fix demo TS type * test: update snapshot * docs: fix TS demo * feat: update Rate character type * docs: fix lint error * feat: update Rate character type * feat: update Rate character type
78 lines
1.5 KiB
Markdown
78 lines
1.5 KiB
Markdown
---
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order: 9
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title:
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zh-CN: 动态加载选项
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en-US: Load Options Lazily
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---
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## zh-CN
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使用 `loadData` 实现动态加载选项。
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> 注意：`loadData` 与 `showSearch` 无法一起使用。
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## en-US
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Load options lazily with `loadData`.
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> Note: `loadData` cannot work with `showSearch`.
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```tsx
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import React, { useState } from 'react';
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import { Cascader } from 'antd';
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interface Option {
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value: string;
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label: string;
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children?: Option[];
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isLeaf?: boolean;
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loading?: boolean;
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}
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const optionLists: Option[] = [
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{
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value: 'zhejiang',
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label: 'Zhejiang',
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isLeaf: false,
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},
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{
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value: 'jiangsu',
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label: 'Jiangsu',
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isLeaf: false,
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},
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];
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const App: React.FC = () => {
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const [options, setOptions] = useState<Option[]>(optionLists);
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const onChange = (value: string[], selectedOptions: Option[]) => {
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console.log(value, selectedOptions);
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};
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const loadData = (selectedOptions: Option[]) => {
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const targetOption = selectedOptions[selectedOptions.length - 1];
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targetOption.loading = true;
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// load options lazily
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setTimeout(() => {
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targetOption.loading = false;
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targetOption.children = [
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{
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label: `${targetOption.label} Dynamic 1`,
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value: 'dynamic1',
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},
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{
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label: `${targetOption.label} Dynamic 2`,
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value: 'dynamic2',
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},
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];
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setOptions([...options]);
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}, 1000);
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};
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return <Cascader options={options} loadData={loadData} onChange={onChange} changeOnSelect />;
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};
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export default App;
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```
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