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

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

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);

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);






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。

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);

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);

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)

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);

使用 loadData 实现动态加载选项。

注意:loadDatashowSearch 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
allowClear是否支持清除booleantrue
autoFocus自动获取焦点booleanfalse
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(注意,3.7.0 之前的版本为 filedNamesobject{ 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 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,可选 large default smallstringdefault
style自定义样式string-
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
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)

方法#

名称描述
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