Cascader级联选择
级联选择框。
何时使用#
需要从一组相关联的数据集合进行选择,例如省市区,公司层级,事物分类等。
从一个较大的数据集合中进行选择时,用多级分类进行分隔,方便选择。
比起 Select 组件,可以在同一个浮层中完成选择,有较好的体验。
代码演示
import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
    }],
  }],
}];
function onChange(value) {
  console.log(value);
}
ReactDOM.render(
  <Cascader options={options} onChange={onChange} placeholder="Please select" />
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
  }],
}];
class CitySwitcher extends React.Component {
  state = {
    text: 'Unselect',
  };
  onChange = (value, selectedOptions) => {
    this.setState({
      text: selectedOptions.map(o => o.label).join(', '),
    });
  }
  render() {
    return (
      <span>
        {this.state.text}
         
        <Cascader options={options} onChange={this.onChange}>
          <a href="#">Change city</a>
        </Cascader>
      </span>
    );
  }
}
ReactDOM.render(<CitySwitcher />, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  disabled: true,
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
    }],
  }],
}];
function onChange(value) {
  console.log(value);
}
ReactDOM.render(
  <Cascader options={options} onChange={onChange} />
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
    }],
  }],
}];
function onChange(value) {
  console.log(value);
}
ReactDOM.render(
  <div>
    <Cascader size="large" options={options} onChange={onChange} /><br /><br />
    <Cascader options={options} onChange={onChange} /><br /><br />
    <Cascader size="small" options={options} onChange={onChange} /><br /><br />
  </div>
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }, {
      value: 'xiasha',
      label: 'Xia Sha',
      disabled: true,
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua men',
    }],
  }],
}];
function onChange(value, selectedOptions) {
  console.log(value, selectedOptions);
}
ReactDOM.render(
  <Cascader
    options={options}
    onChange={onChange}
    placeholder="Please select"
    showSearch
  />,
  mountNode
);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
    }],
  }],
}];
function onChange(value) {
  console.log(value);
}
ReactDOM.render(
  <Cascader defaultValue={['zhejiang', 'hangzhou', 'xihu']} options={options} onChange={onChange} />
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
    }],
  }],
}];
function onChange(value) {
  console.log(value);
}
// Just show the latest item.
function displayRender(label) {
  return label[label.length - 1];
}
ReactDOM.render(
  <Cascader
    options={options}
    expandTrigger="hover"
    displayRender={displayRender}
    onChange={onChange}
  />
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hanzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
    }],
  }],
}];
function onChange(value) {
  console.log(value);
}
ReactDOM.render(
  <Cascader options={options} onChange={onChange} changeOnSelect />
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  children: [{
    value: 'hangzhou',
    label: 'Hangzhou',
    children: [{
      value: 'xihu',
      label: 'West Lake',
      code: 752100,
    }],
  }],
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  children: [{
    value: 'nanjing',
    label: 'Nanjing',
    children: [{
      value: 'zhonghuamen',
      label: 'Zhong Hua Men',
      code: 453400,
    }],
  }],
}];
function handleAreaClick(e, label, option) {
  e.stopPropagation();
  console.log('clicked', label, option);
}
const displayRender = (labels, selectedOptions) => labels.map((label, i) => {
  const option = selectedOptions[i];
  if (i === labels.length - 1) {
    return (
      <span key={option.value}>
        {label} (<a onClick={e => handleAreaClick(e, label, option)}>{option.code}</a>)
      </span>
    );
  }
  return <span key={option.value}>{label} / </span>;
});
ReactDOM.render(
  <Cascader
    options={options}
    defaultValue={['zhejiang', 'hangzhou', 'xihu']}
    displayRender={displayRender}
    style={{ width: 270 }}
  />
, mountNode);import { Cascader } from 'antd';
const options = [{
  value: 'zhejiang',
  label: 'Zhejiang',
  isLeaf: false,
}, {
  value: 'jiangsu',
  label: 'Jiangsu',
  isLeaf: false,
}];
class LazyOptions extends React.Component {
  state = {
    options,
  };
  onChange = (value, selectedOptions) => {
    console.log(value, selectedOptions);
  }
  loadData = (selectedOptions) => {
    const targetOption = selectedOptions[selectedOptions.length - 1];
    targetOption.loading = true;
    // load options lazily
    setTimeout(() => {
      targetOption.loading = false;
      targetOption.children = [{
        label: `${targetOption.label} Dynamic 1`,
        value: 'dynamic1',
      }, {
        label: `${targetOption.label} Dynamic 2`,
        value: 'dynamic2',
      }];
      this.setState({
        options: [...this.state.options],
      });
    }, 1000);
  }
  render() {
    return (
      <Cascader
        options={this.state.options}
        loadData={this.loadData}
        onChange={this.onChange}
        changeOnSelect
      />
    );
  }
}
ReactDOM.render(<LazyOptions />, mountNode);API#
<Cascader options={options} onChange={onChange} />| 参数 | 说明 | 类型 | 默认值 | 
|---|---|---|---|
| allowClear | 是否支持清除 | boolean | true | 
| changeOnSelect | 当此项为 true 时,点选每级菜单选项值都会发生变化,具体见上面的演示 | boolean | false | 
| className | 自定义类名 | string | - | 
| defaultValue | 默认的选中项 | CascaderOptionType[] | [] | 
| disabled | 禁用 | boolean | false | 
| displayRender | 选择后展示的渲染函数 | (label, selectedOptions) => ReactNode | label => label.join(' / ') | 
| expandTrigger | 次级菜单的展开方式,可选 'click' 和 'hover' | string | 'click' | 
| getPopupContainer | 菜单渲染父节点。默认渲染到 body 上,如果你遇到菜单滚动定位问题,试试修改为滚动的区域,并相对其定位。示例 | Function(triggerNode) | () => document.body | 
| loadData | 用于动态加载选项,无法与 showSearch 一起使用 | (selectedOptions) => void | - | 
| notFoundContent | 当下拉列表为空时显示的内容 | string | 'Not Found' | 
| options | 可选项数据源 | object | - | 
| placeholder | 输入框占位文本 | string | '请选择' | 
| popupClassName | 自定义浮层类名 | string | - | 
| popupPlacement | 浮层预设位置:bottomLeft bottomRight topLeft topRight | Enum | bottomLeft | 
| showSearch | 在选择框中显示搜索框 | boolean | false | 
| size | 输入框大小,可选 large default small | string | default | 
| style | 自定义样式 | string | - | 
| value | 指定选中项 | CascaderOptionType[] | - | 
| onChange | 选择完成后的回调 | (value, selectedOptions) => void | - | 
| onPopupVisibleChange | 显示/隐藏浮层的回调 | (value) => void | - | 
| popupVisible | 控制浮层显隐 | boolean | - | 
showSearch 为对象时,其中的字段:
| 参数 | 说明 | 类型 | 默认值 | 
|---|---|---|---|
| filter | 接收 inputValue path 两个参数,当 path 符合筛选条件时,应返回 true,反之则返回 false。 | function(inputValue, path): boolean | |
| matchInputWidth | 搜索结果列表是否与输入框同宽 | boolean | |
| render | 用于渲染 filter 后的选项 | function(inputValue, path): ReactNode | |
| sort | 用于排序 filter 后的选项 | function(a, b, inputValue) | 
注意,如果需要获得中国省市区数据,可以参考 china-division。