2016-12-22 16:35:37 +08:00
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---
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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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2019-05-07 14:57:32 +08:00
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```jsx
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2016-12-22 16:35:37 +08:00
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import { Cascader } from 'antd';
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2020-11-17 11:00:06 +08:00
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const optionLists = [
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2019-05-07 14:57:32 +08:00
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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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2016-12-22 16:35:37 +08:00
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2020-11-17 11:00:06 +08:00
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const LazyOptions = () => {
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const [options, setOptions] = React.useState(optionLists);
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2018-06-27 15:55:04 +08:00
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2020-11-17 11:00:06 +08:00
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const onChange = (value, selectedOptions) => {
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2016-12-22 16:35:37 +08:00
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console.log(value, selectedOptions);
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2019-05-07 14:57:32 +08:00
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};
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2018-06-27 15:55:04 +08:00
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2020-11-17 11:00:06 +08:00
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const loadData = selectedOptions => {
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2016-12-22 16:35:37 +08:00
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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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2019-05-07 14:57:32 +08:00
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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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2020-11-17 11:00:06 +08:00
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setOptions([...options]);
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2016-12-22 16:35:37 +08:00
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}, 1000);
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2019-05-07 14:57:32 +08:00
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};
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2018-06-27 15:55:04 +08:00
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2020-11-17 11:00:06 +08:00
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return <Cascader options={options} loadData={loadData} onChange={onChange} changeOnSelect />;
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};
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2016-12-22 16:35:37 +08:00
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2022-04-03 23:27:45 +08:00
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export default () => <LazyOptions />;
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2019-05-07 14:57:32 +08:00
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```
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