Select选择器

下拉选择器。

何时使用

• 弹出一个下拉菜单给用户选择操作，用于代替原生的选择器，或者需要一个更优雅的多选器时。

• 当选项少时（少于 5 项），建议直接将选项平铺，使用 Radio 是更好的选择。

代码演示

基本使用

基本使用。

import { Select } from 'antd';
const { Option } = Select;
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <>
    <Select defaultValue="lucy" style={{ width: 120 }} onChange={handleChange}>
      <Option value="jack">Jack</Option>
      <Option value="lucy">Lucy</Option>
      <Option value="disabled" disabled>
        Disabled
      </Option>
      <Option value="Yiminghe">yiminghe</Option>
    </Select>
    <Select defaultValue="lucy" style={{ width: 120 }} disabled>
      <Option value="lucy">Lucy</Option>
    </Select>
    <Select defaultValue="lucy" style={{ width: 120 }} loading>
      <Option value="lucy">Lucy</Option>
    </Select>
    <Select defaultValue="lucy" style={{ width: 120 }} allowClear>
      <Option value="lucy">Lucy</Option>
    </Select>
  </>,
  mountNode,
);

多选

多选，从已有条目中选择。

import { Select } from 'antd';
const { Option } = Select;
const children = [];
for (let i = 10; i < 36; i++) {
  children.push(<Option key={i.toString(36) + i}>{i.toString(36) + i}</Option>);
}
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <>
    <Select
      mode="multiple"
      allowClear
      style={{ width: '100%' }}
      placeholder="Please select"
      defaultValue={['a10', 'c12']}
      onChange={handleChange}
    >
      {children}
    </Select>
    <br />
    <Select
      mode="multiple"
      disabled
      style={{ width: '100%' }}
      placeholder="Please select"
      defaultValue={['a10', 'c12']}
      onChange={handleChange}
    >
      {children}
    </Select>
  </>,
  mountNode,
);

定制回填内容

使用 optionLabelProp 指定回填到选择框的 Option 属性。

import { Select } from 'antd';
const { Option } = Select;
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <Select
    mode="multiple"
    style={{ width: '100%' }}
    placeholder="select one country"
    defaultValue={['china']}
    onChange={handleChange}
    optionLabelProp="label"
  >
    <Option value="china" label="China">
      <div className="demo-option-label-item">
        <span role="img" aria-label="China">
          🇨🇳
        </span>
        China (中国)
      </div>
    </Option>
    <Option value="usa" label="USA">
      <div className="demo-option-label-item">
        <span role="img" aria-label="USA">
          🇺🇸
        </span>
        USA (美国)
      </div>
    </Option>
    <Option value="japan" label="Japan">
      <div className="demo-option-label-item">
        <span role="img" aria-label="Japan">
          🇯🇵
        </span>
        Japan (日本)
      </div>
    </Option>
    <Option value="korea" label="Korea">
      <div className="demo-option-label-item">
        <span role="img" aria-label="Korea">
          🇰🇷
        </span>
        Korea (韩国)
      </div>
    </Option>
  </Select>,
  mountNode,
);

.demo-option-label-item > span {
  margin-right: 6px;
}

标签

tags select，随意输入的内容（scroll the menu）。

import { Select } from 'antd';
const { Option } = Select;
const children = [];
for (let i = 10; i < 36; i++) {
  children.push(<Option key={i.toString(36) + i}>{i.toString(36) + i}</Option>);
}
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <Select mode="tags" style={{ width: '100%' }} placeholder="Tags Mode" onChange={handleChange}>
    {children}
  </Select>,
  mountNode,
);

联动

省市联动是典型的例子。

推荐使用 Cascader 组件。

import { Select } from 'antd';
const { Option } = Select;
const provinceData = ['Zhejiang', 'Jiangsu'];
const cityData = {
  Zhejiang: ['Hangzhou', 'Ningbo', 'Wenzhou'],
  Jiangsu: ['Nanjing', 'Suzhou', 'Zhenjiang'],
};
const App = () => {
  const [cities, setCities] = React.useState(cityData[provinceData[0]]);
  const [secondCity, setSecondCity] = React.useState(cityData[provinceData[0]][0]);
  const handleProvinceChange = value => {
    setCities(cityData[value]);
    setSecondCity(cityData[value][0]);
  };
  const onSecondCityChange = value => {
    setSecondCity(value);
  };
  return (
    <>
      <Select defaultValue={provinceData[0]} style={{ width: 120 }} onChange={handleProvinceChange}>
        {provinceData.map(province => (
          <Option key={province}>{province}</Option>
        ))}
      </Select>
      <Select style={{ width: 120 }} value={secondCity} onChange={onSecondCityChange}>
        {cities.map(city => (
          <Option key={city}>{city}</Option>
        ))}
      </Select>
    </>
  );
};
ReactDOM.render(<App />, mountNode);

获得选项的文本

默认情况下 onChange 里只能拿到 value，如果需要拿到选中的节点文本 label，可以使用 labelInValue 属性。

选中项的 label 会被包装到 value 中传递给 onChange 等函数，此时 value 是一个对象。

import { Select } from 'antd';
const { Option } = Select;
function handleChange(value) {
  console.log(value); // { value: "lucy", key: "lucy", label: "Lucy (101)" }
}
ReactDOM.render(
  <Select
    labelInValue
    defaultValue={{ value: 'lucy' }}
    style={{ width: 120 }}
    onChange={handleChange}
  >
    <Option value="jack">Jack (100)</Option>
    <Option value="lucy">Lucy (101)</Option>
  </Select>,
  mountNode,
);

搜索用户

一个带有远程搜索，防抖控制，请求时序控制，加载状态的多选示例。

import { Select, Spin } from 'antd';
import debounce from 'lodash/debounce';
const { Option } = Select;
class UserRemoteSelect extends React.Component {
  constructor(props) {
    super(props);
    this.lastFetchId = 0;
    this.fetchUser = debounce(this.fetchUser, 800);
  }
  state = {
    data: [],
    value: [],
    fetching: false,
  };
  fetchUser = value => {
    console.log('fetching user', value);
    this.lastFetchId += 1;
    const fetchId = this.lastFetchId;
    this.setState({ data: [], fetching: true });
    fetch('https://randomuser.me/api/?results=5')
      .then(response => response.json())
      .then(body => {
        if (fetchId !== this.lastFetchId) {
          // for fetch callback order
          return;
        }
        const data = body.results.map(user => ({
          text: `${user.name.first} ${user.name.last}`,
          value: user.login.username,
        }));
        this.setState({ data, fetching: false });
      });
  };
  handleChange = value => {
    this.setState({
      value,
      data: [],
      fetching: false,
    });
  };
  render() {
    const { fetching, data, value } = this.state;
    return (
      <Select
        mode="multiple"
        labelInValue
        value={value}
        placeholder="Select users"
        notFoundContent={fetching ? <Spin size="small" /> : null}
        filterOption={false}
        onSearch={this.fetchUser}
        onChange={this.handleChange}
        style={{ width: '100%' }}
      >
        {data.map(d => (
          <Option key={d.value}>{d.text}</Option>
        ))}
      </Select>
    );
  }
}
ReactDOM.render(<UserRemoteSelect />, mountNode);

隐藏已选择选项

隐藏下拉列表中已选择的选项。

import { Select } from 'antd';
const OPTIONS = ['Apples', 'Nails', 'Bananas', 'Helicopters'];
class SelectWithHiddenSelectedOptions extends React.Component {
  state = {
    selectedItems: [],
  };
  handleChange = selectedItems => {
    this.setState({ selectedItems });
  };
  render() {
    const { selectedItems } = this.state;
    const filteredOptions = OPTIONS.filter(o => !selectedItems.includes(o));
    return (
      <Select
        mode="multiple"
        placeholder="Inserted are removed"
        value={selectedItems}
        onChange={this.handleChange}
        style={{ width: '100%' }}
      >
        {filteredOptions.map(item => (
          <Select.Option key={item} value={item}>
            {item}
          </Select.Option>
        ))}
      </Select>
    );
  }
}
ReactDOM.render(<SelectWithHiddenSelectedOptions />, mountNode);

无边框

无边框样式。

import { Select } from 'antd';
const { Option } = Select;
ReactDOM.render(
  <>
    <Select defaultValue="lucy" style={{ width: 120 }} bordered={false}>
      <Option value="jack">Jack</Option>
      <Option value="lucy">Lucy</Option>
      <Option value="Yiminghe">yiminghe</Option>
    </Select>
    <Select defaultValue="lucy" style={{ width: 120 }} disabled bordered={false}>
      <Option value="lucy">Lucy</Option>
    </Select>
  </>,
  mountNode,
);

带搜索框

展开后可对选项进行搜索。

import { Select } from 'antd';
const { Option } = Select;
function onChange(value) {
  console.log(`selected ${value}`);
}
function onBlur() {
  console.log('blur');
}
function onFocus() {
  console.log('focus');
}
function onSearch(val) {
  console.log('search:', val);
}
ReactDOM.render(
  <Select
    showSearch
    style={{ width: 200 }}
    placeholder="Select a person"
    optionFilterProp="children"
    onChange={onChange}
    onFocus={onFocus}
    onBlur={onBlur}
    onSearch={onSearch}
    filterOption={(input, option) =>
      option.children.toLowerCase().indexOf(input.toLowerCase()) >= 0
    }
  >
    <Option value="jack">Jack</Option>
    <Option value="lucy">Lucy</Option>
    <Option value="tom">Tom</Option>
  </Select>,
  mountNode,
);

三种大小

三种大小的选择框，当 size 分别为 large 和 small 时，输入框高度为 40px 和 24px ，默认高度为 32px。

import { Select, Radio } from 'antd';
const { Option } = Select;
const children = [];
for (let i = 10; i < 36; i++) {
  children.push(<Option key={i.toString(36) + i}>{i.toString(36) + i}</Option>);
}
function handleChange(value) {
  console.log(`Selected: ${value}`);
}
const SelectSizesDemo = () => {
  const [size, setSize] = React.useState('default');
  const handleSizeChange = e => {
    setSize(e.target.value);
  };
  return (
    <>
      <Radio.Group value={size} onChange={handleSizeChange}>
        <Radio.Button value="large">Large</Radio.Button>
        <Radio.Button value="default">Default</Radio.Button>
        <Radio.Button value="small">Small</Radio.Button>
      </Radio.Group>
      <br />
      <br />
      <Select size={size} defaultValue="a1" onChange={handleChange} style={{ width: 200 }}>
        {children}
      </Select>
      <br />
      <Select
        mode="multiple"
        size={size}
        placeholder="Please select"
        defaultValue={['a10', 'c12']}
        onChange={handleChange}
        style={{ width: '100%' }}
      >
        {children}
      </Select>
      <br />
      <Select
        mode="tags"
        size={size}
        placeholder="Please select"
        defaultValue={['a10', 'c12']}
        onChange={handleChange}
        style={{ width: '100%' }}
      >
        {children}
      </Select>
    </>
  );
};
ReactDOM.render(<SelectSizesDemo />, mountNode);

.code-box-demo .ant-select {
  margin: 0 8px 10px 0;
}
.ant-row-rtl .code-box-demo .ant-select {
  margin: 0 0 10px 8px;
}
#components-select-demo-search-box .code-box-demo .ant-select {
  margin: 0;
}

带排序的搜索

在搜索模式下对过滤结果项进行排序。

import { Select } from 'antd';
const { Option } = Select;
ReactDOM.render(
  <Select
    showSearch
    style={{ width: 200 }}
    placeholder="Search to Select"
    optionFilterProp="children"
    filterOption={(input, option) =>
      option.children.toLowerCase().indexOf(input.toLowerCase()) >= 0
    }
    filterSort={(optionA, optionB) =>
      optionA.children.toLowerCase().localeCompare(optionB.children.toLowerCase())
    }
  >
    <Option value="1">Not Identified</Option>
    <Option value="2">Closed</Option>
    <Option value="3">Communicated</Option>
    <Option value="4">Identified</Option>
    <Option value="5">Resolved</Option>
    <Option value="6">Cancelled</Option>
  </Select>,
  mountNode,
);

分组

用 OptGroup 进行选项分组。

import { Select } from 'antd';
const { Option, OptGroup } = Select;
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <Select defaultValue="lucy" style={{ width: 200 }} onChange={handleChange}>
    <OptGroup label="Manager">
      <Option value="jack">Jack</Option>
      <Option value="lucy">Lucy</Option>
    </OptGroup>
    <OptGroup label="Engineer">
      <Option value="Yiminghe">yiminghe</Option>
    </OptGroup>
  </Select>,
  mountNode,
);

搜索框

搜索和远程数据结合。

import { Select } from 'antd';
import jsonp from 'fetch-jsonp';
import querystring from 'querystring';
const { Option } = Select;
let timeout;
let currentValue;
function fetch(value, callback) {
  if (timeout) {
    clearTimeout(timeout);
    timeout = null;
  }
  currentValue = value;
  function fake() {
    const str = querystring.encode({
      code: 'utf-8',
      q: value,
    });
    jsonp(`https://suggest.taobao.com/sug?${str}`)
      .then(response => response.json())
      .then(d => {
        if (currentValue === value) {
          const { result } = d;
          const data = [];
          result.forEach(r => {
            data.push({
              value: r[0],
              text: r[0],
            });
          });
          callback(data);
        }
      });
  }
  timeout = setTimeout(fake, 300);
}
class SearchInput extends React.Component {
  state = {
    data: [],
    value: undefined,
  };
  handleSearch = value => {
    if (value) {
      fetch(value, data => this.setState({ data }));
    } else {
      this.setState({ data: [] });
    }
  };
  handleChange = value => {
    this.setState({ value });
  };
  render() {
    const options = this.state.data.map(d => <Option key={d.value}>{d.text}</Option>);
    return (
      <Select
        showSearch
        value={this.state.value}
        placeholder={this.props.placeholder}
        style={this.props.style}
        defaultActiveFirstOption={false}
        showArrow={false}
        filterOption={false}
        onSearch={this.handleSearch}
        onChange={this.handleChange}
        notFoundContent={null}
      >
        {options}
      </Select>
    );
  }
}
ReactDOM.render(<SearchInput placeholder="input search text" style={{ width: 200 }} />, mountNode);

自动分词

试下复制 露西,杰克 到输入框里。只在 tags 和 multiple 模式下可用。

import { Select } from 'antd';
const { Option } = Select;
const children = [];
for (let i = 10; i < 36; i++) {
  children.push(<Option key={i.toString(36) + i}>{i.toString(36) + i}</Option>);
}
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <Select mode="tags" style={{ width: '100%' }} onChange={handleChange} tokenSeparators={[',']}>
    {children}
  </Select>,
  mountNode,
);

扩展菜单

使用 dropdownRender 对下拉菜单进行自由扩展。

import { Select, Divider, Input } from 'antd';
import { PlusOutlined } from '@ant-design/icons';
const { Option } = Select;
let index = 0;
class App extends React.Component {
  state = {
    items: ['jack', 'lucy'],
    name: '',
  };
  onNameChange = event => {
    this.setState({
      name: event.target.value,
    });
  };
  addItem = () => {
    console.log('addItem');
    const { items, name } = this.state;
    this.setState({
      items: [...items, name || `New item ${index++}`],
      name: '',
    });
  };
  render() {
    const { items, name } = this.state;
    return (
      <Select
        style={{ width: 240 }}
        placeholder="custom dropdown render"
        dropdownRender={menu => (
          <div>
            {menu}
            <Divider style={{ margin: '4px 0' }} />
            <div style={{ display: 'flex', flexWrap: 'nowrap', padding: 8 }}>
              <Input style={{ flex: 'auto' }} value={name} onChange={this.onNameChange} />
              <a
                style={{ flex: 'none', padding: '8px', display: 'block', cursor: 'pointer' }}
                onClick={this.addItem}
              >
                <PlusOutlined /> Add item
              </a>
            </div>
          </div>
        )}
      >
        {items.map(item => (
          <Option key={item}>{item}</Option>
        ))}
      </Select>
    );
  }
}
ReactDOM.render(<App />, mountNode);

大数据

Select 使用了虚拟滚动技术，因而获得了比 3.0 更好的性能。

import { Select, Typography, Divider } from 'antd';
const { Title } = Typography;
const options = [];
for (let i = 0; i < 100000; i++) {
  const value = `${i.toString(36)}${i}`;
  options.push({
    value,
    disabled: i === 10,
  });
}
function handleChange(value) {
  console.log(`selected ${value}`);
}
ReactDOM.render(
  <>
    <Title level={3}>Ant Design 4.0</Title>
    <Title level={4}>{options.length} Items</Title>
    <Select
      mode="multiple"
      style={{ width: '100%' }}
      placeholder="Please select"
      defaultValue={['a10', 'c12']}
      onChange={handleChange}
      options={options}
    />
    <Divider />
    <Title level={3}>Ant Design 3.0</Title>
    <iframe
      title="Ant Design 3.0 Select demo"
      src="https://codesandbox.io/embed/solitary-voice-m3vme?fontsize=14&hidenavigation=1&theme=dark&view=preview"
      style={{ width: '100%', height: 300 }}
    />
  </>,
  mountNode,
);

自定义选择标签

允许自定义选择标签的样式。

import { Select, Tag } from 'antd';
const options = [{ value: 'gold' }, { value: 'lime' }, { value: 'green' }, { value: 'cyan' }];
function tagRender(props) {
  const { label, value, closable, onClose } = props;
  return (
    <Tag color={value} closable={closable} onClose={onClose} style={{ marginRight: 3 }}>
      {label}
    </Tag>
  );
}
ReactDOM.render(
  <Select
    mode="multiple"
    showArrow
    tagRender={tagRender}
    defaultValue={['gold', 'cyan']}
    style={{ width: '100%' }}
    options={options}
  />,
  mountNode,
);

API

<Select>
  <Option value="lucy">lucy</Option>
</Select>

Select props

注意，如果发现下拉菜单跟随页面滚动，或者需要在其他弹层中触发 Select，请尝试使用 getPopupContainer={triggerNode => triggerNode.parentElement} 将下拉弹层渲染节点固定在触发器的父元素中。

Select Methods

Option props

OptGroup props

FAQ

点击 dropdownRender 里的内容浮层关闭怎么办？

看下 dropdownRender 例子 里的说明。

自定义 Option 样式导致滚动异常怎么办？

这是由于虚拟滚动默认选项高度为 32px，如果你的选项高度小于该值则需要通过 listItemHeight 属性调整，而 listHeight 用于设置滚动容器高度：

<Select listItemHeight={10} listHeight={250} />

注意：listItemHeight 和 listHeight 为内部属性，如无必要，请勿修改该值。

为何无障碍测试会报缺失 aria- 属性？

Select 无障碍辅助元素仅在弹窗展开时创建，因而当你在进行无障碍检测时请先打开下拉后再进行测试。对于 aria-label 与 aria-labelledby 属性缺失警告，请自行为 Select 组件添加相应无障碍属性。