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

基本

省市区级联。

expand codeexpand code
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,
);
Unselect Change city
可以自定义显示

切换按钮和结果分开。

expand codeexpand code
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}
        &nbsp;
        <Cascader options={options} onChange={this.onChange}>
          <a href="#">Change city</a>
        </Cascader>
      </span>
    );
  }
}

ReactDOM.render(<CitySwitcher />, mountNode);
禁用选项

通过指定 options 里的 disabled 字段。

expand codeexpand code
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);






大小

不同大小的级联选择器。

expand codeexpand code
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,
);
自定义字段名

自定义字段名。

expand codeexpand code
import { Cascader } from 'antd';

const options = [
  {
    code: 'zhejiang',
    name: 'Zhejiang',
    items: [
      {
        code: 'hangzhou',
        name: 'Hangzhou',
        items: [
          {
            code: 'xihu',
            name: 'West Lake',
          },
        ],
      },
    ],
  },
  {
    code: 'jiangsu',
    name: 'Jiangsu',
    items: [
      {
        code: 'nanjing',
        name: 'Nanjing',
        items: [
          {
            code: 'zhonghuamen',
            name: 'Zhong Hua Men',
          },
        ],
      },
    ],
  },
];

function onChange(value) {
  console.log(value);
}

ReactDOM.render(
  <Cascader
    fieldNames={{ label: 'name', value: 'code', children: 'items' }}
    options={options}
    onChange={onChange}
    placeholder="Please select"
  />,
  mountNode,
);
Zhejiang / Hangzhou / West Lake
默认值

默认值通过数组的方式指定。

expand codeexpand code
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,
);
移入展开

通过移入展开下级菜单，点击完成选择。

expand codeexpand code
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,
);
选择即改变

这种交互允许只选中父级选项。

expand codeexpand code
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);
Zhejiang / Hangzhou / West Lake (752100)
自定义已选项

例如给最后一项加上邮编链接。

expand codeexpand code
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: '100%' }}
  />,
  mountNode,
);
动态加载选项

使用 loadData 实现动态加载选项。

注意：loadData 与 showSearch 无法一起使用。

expand codeexpand code
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版本
allowClear是否支持清除booleantrue
autoFocus自动获取焦点booleanfalse
bordered是否有边框booleantrue
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booleanfalse
className自定义类名string-
defaultValue默认的选中项string[][]
disabled禁用booleanfalse
displayRender选择后展示的渲染函数(label, selectedOptions) => ReactNodelabel => label.join(' / ')
expandTrigger次级菜单的展开方式，可选 'click' 和 'hover'string'click'
fieldNames自定义 options 中 label name children 的字段object{ label: 'label', value: 'value', children: 'children' }
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Option[]-
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 topRightEnumbottomLeft
popupVisible控制浮层显隐boolean-
showSearch在选择框中显示搜索框booleanfalse
size输入框大小large | middle | small无
style自定义样式string-
suffixIcon自定义的选择框后缀图标ReactNode-
value指定选中项string[]-
onChange选择完成后的回调(value, selectedOptions) => void-
onPopupVisibleChange显示/隐藏浮层的回调(value) => void-

showSearch 为对象时，其中的字段：

参数说明类型默认值版本
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
limit搜索结果展示数量number | false50
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)

Option#

interface Option {
  value: string;
  label?: React.ReactNode;
  disabled?: boolean;
  children?: Option[];
}

方法#

名称描述版本
blur()移除焦点
focus()获取焦点

注意，如果需要获得中国省市区数据，可以参考 china-division。

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