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。
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,
);
切换按钮和结果分开。
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);
通过指定 options 里的 disabled
字段。
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。
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,
);
可以直接搜索选项并选择。
Cascader[showSearch]
暂不支持服务端搜索,更多信息见 #5547
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);
}
function filter(inputValue, path) {
return path.some(option => option.label.toLowerCase().indexOf(inputValue.toLowerCase()) > -1);
}
ReactDOM.render(
<Cascader
options={options}
onChange={onChange}
placeholder="Please select"
showSearch={{ filter }}
/>,
mountNode,
);
自定义字段名。
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,
);
默认值通过数组的方式指定。
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。
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。
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);
例如给最后一项加上邮编链接。
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:
loadData
与showSearch
无法一起使用。
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 | boolean | true | |
autoFocus | 自动获取焦点 | boolean | false | |
bordered | 是否有边框 | 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 | string[] | number[] | [] | |
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’ | |
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 topRight | Enum | bottomLeft | |
popupVisible | 控制浮层显隐 | boolean | - | |
showSearch | 在选择框中显示搜索框 | boolean | false | |
size | 输入框大小 | large | middle | small | 无 | |
style | 自定义样式 | CSSProperties | - | |
suffixIcon | 自定义的选择框后缀图标 | ReactNode | - | |
value | 指定选中项 | string[] | number[] | - | |
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 | false | 50 | |
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 | number;
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。