ant-design/components/tree-select/demo/maxCountNoEffect.tsx

import React, { useState } from 'react';
import { TreeSelect } from 'antd';
import { DownOutlined } from '@ant-design/icons';

const treeData = [
  {
    title: 'Node1',
    value: '0-0',
    key: '0-0',
    children: [
      {
        title: 'Child Node1',
        value: '0-0-1',
        key: '0-0-1',
      },
      {
        title: 'Child Node2',
        value: '0-0-2',
        key: '0-0-2',
      },
    ],
  },
  {
    title: 'Node2',
    value: '0-1',
    key: '0-1',
    children: [
      {
        title: 'Child Node3',
        value: '0-1-1',
        key: '0-1-1',
      },
      {
        title: 'Child Node4',
        value: '0-1-2',
        key: '0-1-2',
      },
    ],
  },
];

const MAX_COUNT = 2;

function MaxCountNoEffectDemo() {
  const [value, setValue] = useState<string[]>([]);

  const suffix = (
    <>
      <span>
        {value.length} / {MAX_COUNT}
      </span>
      <DownOutlined />
    </>
  );

  return (
    <TreeSelect
      treeCheckable
      showCheckedStrategy={TreeSelect.SHOW_PARENT}
      maxCount={MAX_COUNT}
      suffixIcon={suffix}
      placeholder="please select"
      value={value}
      onChange={(val) => setValue(val as string[])}
      style={{ width: '100%' }}
      treeData={treeData}
    />
  );
}

export default MaxCountNoEffectDemo;